Introdução ao MongoDB e ao Java - Tutorial de operações CRUD

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git clone git@github.com:mongodb-developer/java-quick-start.git

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java-quick-start/
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├── pom.xml
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└── src
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    └── main
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        └── java
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            └── com
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                └── mongodb
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                    └── quickstart

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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         xmlns="http://maven.apache.org/POM/4.0.0"
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         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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    <modelVersion>4.0.0</modelVersion>
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    <groupId>com.mongodb</groupId>
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    <artifactId>java-quick-start</artifactId>
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    <version>1.0-SNAPSHOT</version>
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    <properties>
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        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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        <maven-compiler-plugin.source>21</maven-compiler-plugin.source>
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        <maven-compiler-plugin.target>21</maven-compiler-plugin.target>
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        <maven-compiler-plugin.version>3.12.1</maven-compiler-plugin.version>
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        <mongodb-driver-sync.version>5.0.0</mongodb-driver-sync.version>
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        <mongodb-crypt.version>1.8.0</mongodb-crypt.version>
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        <!-- Keeping 1.2.13 until mongodb-crypt makes slf4j-api an optional dependency -->
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        <!-- https://jira.mongodb.org/browse/MONGOCRYPT-602 -->
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        <logback-classic.version>1.2.13</logback-classic.version>
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        <exec-maven-plugin.version>3.1.1</exec-maven-plugin.version>
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    </properties>
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    <dependencies>
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        <dependency>
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            <groupId>org.mongodb</groupId>
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            <artifactId>mongodb-driver-sync</artifactId>
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            <version>${mongodb-driver-sync.version}</version>
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        </dependency>
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        <dependency>
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            <groupId>org.mongodb</groupId>
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            <artifactId>mongodb-crypt</artifactId>
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            <version>${mongodb-crypt.version}</version>
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        </dependency>
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        <dependency>
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            <groupId>ch.qos.logback</groupId>
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            <artifactId>logback-classic</artifactId>
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            <version>${logback-classic.version}</version>
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        </dependency>
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    </dependencies>
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    <build>
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        <plugins>
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            <plugin>
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                <groupId>org.apache.maven.plugins</groupId>
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                <artifactId>maven-compiler-plugin</artifactId>
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                <version>${maven-compiler-plugin.version}</version>
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                <configuration>
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                    <source>${maven-compiler-plugin.source}</source>
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                    <target>${maven-compiler-plugin.target}</target>
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                </configuration>
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            </plugin>
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            <plugin>
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                <!-- Adding this plugin, so we don't need to add -Dexec.cleanupDaemonThreads=false in the mvn cmd line -->
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                <!-- to avoid the IllegalThreadStateException when running with Maven -->
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                <groupId>org.codehaus.mojo</groupId>
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                <artifactId>exec-maven-plugin</artifactId>
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                <version>${exec-maven-plugin.version}</version>
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                <configuration>
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                    <cleanupDaemonThreads>false</cleanupDaemonThreads>
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                </configuration>
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            </plugin>
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        </plugins>
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    </build>
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</project>

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package com.mongodb.quickstart;
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public class HelloMongoDB {
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    public static void main(String[] args) {
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        System.out.println("Hello MongoDB!");
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    }
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}

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mvn compile exec:java -Dexec.mainClass="com.mongodb.quickstart.HelloMongoDB"

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[INFO] Scanning for projects...
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[INFO] 
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[INFO] --------------------< com.mongodb:java-quick-start >--------------------
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[INFO] Building java-quick-start 1.0-SNAPSHOT
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[INFO] --------------------------------[ jar ]---------------------------------
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[INFO] 
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[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ java-quick-start ---
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[INFO] Using 'UTF-8' encoding to copy filtered resources.
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[INFO] Copying 1 resource
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[INFO] 
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[INFO] --- maven-compiler-plugin:3.12.1:compile (default-compile) @ java-quick-start ---
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[INFO] Nothing to compile - all classes are up to date.
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[INFO] 
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[INFO] --- exec-maven-plugin:3.1.1:java (default-cli) @ java-quick-start ---
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Hello MongoDB!
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[INFO] ------------------------------------------------------------------------
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[INFO] BUILD SUCCESS
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[INFO] ------------------------------------------------------------------------
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[INFO] Total time:  0.634 s
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[INFO] Finished at: 2024-02-19T18:12:22+01:00
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[INFO] ------------------------------------------------------------------------

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package com.mongodb.quickstart;
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import com.mongodb.client.MongoClient;
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import com.mongodb.client.MongoClients;
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import org.bson.Document;
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import org.bson.json.JsonWriterSettings;
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import java.util.ArrayList;
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import java.util.List;
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public class Connection {
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    public static void main(String[] args) {
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        String connectionString = System.getProperty("mongodb.uri");
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        try (MongoClient mongoClient = MongoClients.create(connectionString)) {
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            System.out.println("=> Connection successful: " + preFlightChecks(mongoClient));
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            System.out.println("=> Print list of databases:");
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            List<Document> databases = mongoClient.listDatabases().into(new ArrayList<>());
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            databases.forEach(db -> System.out.println(db.toJson()));
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        }
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    }
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    static boolean preFlightChecks(MongoClient mongoClient) {
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        Document pingCommand = new Document("ping", 1);
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        Document response = mongoClient.getDatabase("admin").runCommand(pingCommand);
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        System.out.println("=> Print result of the '{ping: 1}' command.");
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        System.out.println(response.toJson(JsonWriterSettings.builder().indent(true).build()));
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        return response.get("ok", Number.class).intValue() == 1;
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    }
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}

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mvn compile exec:java -Dexec.mainClass="com.mongodb.quickstart.Connection" -Dmongodb.uri="mongodb+srv://username:password@cluster0-abcde.mongodb.net/test?w=majority"

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{"name": "admin", "sizeOnDisk": 303104.0, "empty": false}
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{"name": "config", "sizeOnDisk": 147456.0, "empty": false}
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{"name": "local", "sizeOnDisk": 5.44731136E8, "empty": false}
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{"name": "sample_airbnb", "sizeOnDisk": 5.761024E7, "empty": false}
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{"name": "sample_geospatial", "sizeOnDisk": 1384448.0, "empty": false}
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{"name": "sample_mflix", "sizeOnDisk": 4.583424E7, "empty": false}
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{"name": "sample_supplies", "sizeOnDisk": 1339392.0, "empty": false}
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{"name": "sample_training", "sizeOnDisk": 7.4801152E7, "empty": false}
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{"name": "sample_weatherdata", "sizeOnDisk": 5103616.0, "empty": false}

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MongoDB Enterprise Cluster0-shard-0:PRIMARY> db.grades.findOne({student_id: 0, class_id: 339})
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{
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    "_id" : ObjectId("56d5f7eb604eb380b0d8d8ce"),
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    "student_id" : 0,
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    "scores" : [
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        {
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            "type" : "exam",
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            "score" : 78.40446309504266
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        },
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        {
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            "type" : "quiz",
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            "score" : 73.36224783231339
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        },
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        {
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            "type" : "homework",
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            "score" : 46.980982486720535
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        },
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        {
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            "type" : "homework",
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            "score" : 76.67556138656222
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        }
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    ],
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    "class_id" : 339
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}

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{
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    "_id": {
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        "$oid": "56d5f7eb604eb380b0d8d8ce"
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    },
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    "student_id": {
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        "$numberDouble": "0"
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    },
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    "scores": [{
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        "type": "exam",
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        "score": {
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            "$numberDouble": "78.40446309504266"
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        }
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    }, {
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        "type": "quiz",
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        "score": {
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            "$numberDouble": "73.36224783231339"
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        }
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    }, {
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        "type": "homework",
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        "score": {
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            "$numberDouble": "46.980982486720535"
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        }
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    }, {
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        "type": "homework",
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        "score": {
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            "$numberDouble": "76.67556138656222"
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        }
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    }],
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    "class_id": {
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        "$numberDouble": "339"
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    }
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}

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package com.mongodb.quickstart;
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import com.mongodb.client.MongoClient;
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import com.mongodb.client.MongoClients;
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import com.mongodb.client.MongoCollection;
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import com.mongodb.client.MongoDatabase;
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import org.bson.Document;
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public class Create {
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    public static void main(String[] args) {
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        try (MongoClient mongoClient = MongoClients.create(System.getProperty("mongodb.uri"))) {
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            MongoDatabase sampleTrainingDB = mongoClient.getDatabase("sample_training");
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            MongoCollection<Document> gradesCollection = sampleTrainingDB.getCollection("grades");
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        }
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    }
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}

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Random rand = new Random();
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Document student = new Document("_id", new ObjectId());
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student.append("student_id", 10000d)
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       .append("class_id", 1d)
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       .append("scores", List.of(new Document("type", "exam").append("score", rand.nextDouble() * 100),
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                                 new Document("type", "quiz").append("score", rand.nextDouble() * 100),
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                                 new Document("type", "homework").append("score", rand.nextDouble() * 100),
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                                 new Document("type", "homework").append("score", rand.nextDouble() * 100)));

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gradesCollection.insertOne(student);

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package com.mongodb.quickstart;
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import com.mongodb.client.MongoClient;
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import com.mongodb.client.MongoClients;
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import com.mongodb.client.MongoCollection;
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import com.mongodb.client.MongoDatabase;
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import org.bson.Document;
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import org.bson.types.ObjectId;
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import java.util.List;
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import java.util.Random;
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public class Create {
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    public static void main(String[] args) {
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        try (MongoClient mongoClient = MongoClients.create(System.getProperty("mongodb.uri"))) {
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            MongoDatabase sampleTrainingDB = mongoClient.getDatabase("sample_training");
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            MongoCollection<Document> gradesCollection = sampleTrainingDB.getCollection("grades");
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            Random rand = new Random();
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            Document student = new Document("_id", new ObjectId());
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            student.append("student_id", 10000d)
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                   .append("class_id", 1d)
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                   .append("scores", List.of(new Document("type", "exam").append("score", rand.nextDouble() * 100),
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                                             new Document("type", "quiz").append("score", rand.nextDouble() * 100),
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                                             new Document("type", "homework").append("score", rand.nextDouble() * 100),
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                                             new Document("type", "homework").append("score", rand.nextDouble() * 100)));
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            gradesCollection.insertOne(student);
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        }
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    }
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}

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mvn compile exec:java -Dexec.mainClass="com.mongodb.quickstart.Create" -Dmongodb.uri="mongodb+srv://USERNAME:PASSWORD@cluster0-abcde.mongodb.net/test?w=majority"

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{
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    "_id": {
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        "$oid": "5d97c375ded5651ea3462d0f"
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    },
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    "student_id": {
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        "$numberDouble": "10000"
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    },
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    "class_id": {
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        "$numberDouble": "1"
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    },
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    "scores": [{
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        "type": "exam",
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        "score": {
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            "$numberDouble": "4.615256396625178"
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        }
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    }, {
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        "type": "quiz",
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        "score": {
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            "$numberDouble": "73.06173415145801"
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        }
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    }, {
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        "type": "homework",
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        "score": {
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            "$numberDouble": "19.378205578990727"
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        }
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    }, {
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        "type": "homework",
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        "score": {
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            "$numberDouble": "82.3089189278531"
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        }
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    }]
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}

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Random rand = new Random();
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Document student = new Document("_id", new ObjectId());
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student.append("student_id", 10000d)
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       .append("scores", List.of(new Document("type", "exam").append("score", rand.nextDouble() * 100),
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                                 new Document("type", "quiz").append("score", rand.nextDouble() * 100),
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                                 new Document("type", "homework").append("score", rand.nextDouble() * 100),
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                                 new Document("type", "homework").append("score", rand.nextDouble() * 100)))
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       .append("class_id", 1d);

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private static final Random rand = new Random();

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private static Document generateNewGrade(double studentId, double classId) {
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    List<Document> scores = List.of(new Document("type", "exam").append("score", rand.nextDouble() * 100),
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                                    new Document("type", "quiz").append("score", rand.nextDouble() * 100),
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                                    new Document("type", "homework").append("score", rand.nextDouble() * 100),
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                                    new Document("type", "homework").append("score", rand.nextDouble() * 100));
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    return new Document("_id", new ObjectId()).append("student_id", studentId)
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                                              .append("class_id", classId)
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                                              .append("scores", scores);
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}

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List<Document> grades = new ArrayList<>();
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for (double classId = 1d; classId <= 10d; classId++) {
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    grades.add(generateNewGrade(10001d, classId));
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}
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gradesCollection.insertMany(grades, new InsertManyOptions().ordered(false));

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package com.mongodb.quickstart;
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import com.mongodb.client.MongoClient;
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import com.mongodb.client.MongoClients;
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import com.mongodb.client.MongoCollection;
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import com.mongodb.client.MongoDatabase;
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import com.mongodb.client.model.InsertManyOptions;
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import org.bson.Document;
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import org.bson.types.ObjectId;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Random;
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public class Create {
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    private static final Random rand = new Random();
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    public static void main(String[] args) {
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        try (MongoClient mongoClient = MongoClients.create(System.getProperty("mongodb.uri"))) {
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            MongoDatabase sampleTrainingDB = mongoClient.getDatabase("sample_training");
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            MongoCollection<Document> gradesCollection = sampleTrainingDB.getCollection("grades");
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            insertOneDocument(gradesCollection);
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            insertManyDocuments(gradesCollection);
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        }
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    }
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    private static void insertOneDocument(MongoCollection<Document> gradesCollection) {
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        gradesCollection.insertOne(generateNewGrade(10000d, 1d));
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        System.out.println("One grade inserted for studentId 10000.");
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    }
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    private static void insertManyDocuments(MongoCollection<Document> gradesCollection) {
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        List<Document> grades = new ArrayList<>();
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        for (double classId = 1d; classId <= 10d; classId++) {
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            grades.add(generateNewGrade(10001d, classId));
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        }
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        gradesCollection.insertMany(grades, new InsertManyOptions().ordered(false));
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        System.out.println("Ten grades inserted for studentId 10001.");
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    }
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    private static Document generateNewGrade(double studentId, double classId) {
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        List<Document> scores = List.of(new Document("type", "exam").append("score", rand.nextDouble() * 100),
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                                        new Document("type", "quiz").append("score", rand.nextDouble() * 100),
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                                        new Document("type", "homework").append("score", rand.nextDouble() * 100),
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                                        new Document("type", "homework").append("score", rand.nextDouble() * 100));
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        return new Document("_id", new ObjectId()).append("student_id", studentId)
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                                                  .append("class_id", classId)
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                                                  .append("scores", scores);
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    }
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}

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MongoDB Enterprise Cluster0-shard-0:PRIMARY> db.grades.findOne({"student_id":10000})
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{
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    "_id" : ObjectId("5daa0e274f52b44cfea94652"),
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    "student_id" : 10000,
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    "class_id" : 1,
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    "scores" : [
7
        {
8
            "type" : "exam",
9
            "score" : 39.25175977753478
10
        },
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        {
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            "type" : "quiz",
13
            "score" : 80.2908713167313
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        },
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        {
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            "type" : "homework",
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            "score" : 63.5444978481843
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        },
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        {
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            "type" : "homework",
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            "score" : 82.35202261582563
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        }
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    ]
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}

1
package com.mongodb.quickstart;
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import com.mongodb.client.*;
4
import org.bson.Document;
5
6
import java.util.ArrayList;
7
import java.util.List;
8
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import static com.mongodb.client.model.Filters.*;
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import static com.mongodb.client.model.Projections.*;
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import static com.mongodb.client.model.Sorts.descending;
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public class Read {
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    public static void main(String[] args) {
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        try (MongoClient mongoClient = MongoClients.create(System.getProperty("mongodb.uri"))) {
17
            MongoDatabase sampleTrainingDB = mongoClient.getDatabase("sample_training");
18
            MongoCollection<Document> gradesCollection = sampleTrainingDB.getCollection("grades");
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            // find one document with new Document
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            Document student1 = gradesCollection.find(new Document("student_id", 10000)).first();
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            System.out.println("Student 1: " + student1.toJson());
23
        }
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    }
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}

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mvn compile exec:java -Dexec.mainClass="com.mongodb.quickstart.Read" -Dmongodb.uri="mongodb+srv://USERNAME:PASSWORD@cluster0-abcde.mongodb.net/test?w=majority"

1
Student 1: {"_id": {"$oid": "5daa0e274f52b44cfea94652"},
2
    "student_id": 10000.0,
3
    "class_id": 1.0,
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    "scores": [
5
        {"type": "exam", "score": 39.25175977753478},
6
        {"type": "quiz", "score": 80.2908713167313},
7
        {"type": "homework", "score": 63.5444978481843},
8
        {"type": "homework", "score": 82.35202261582563}
9
    ]
10
}

1
gradesCollection.find(eq("student_id", 10000)).first();

1
import static com.mongodb.client.model.Filters.eq;

1
// without helpers
2
gradesCollection.find(new Document("student_id", new Document("$gte", 10000)));
3
// with the Filters.gte() helper
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gradesCollection.find(gte("student_id", 10000));

1
FindIterable<Document> iterable = gradesCollection.find(gte("student_id", 10000));
2
MongoCursor<Document> cursor = iterable.iterator();
3
System.out.println("Student list with cursor: ");
4
while (cursor.hasNext()) {
5
    System.out.println(cursor.next().toJson());
6
}

1
List<Document> studentList = gradesCollection.find(gte("student_id", 10000)).into(new ArrayList<>());
2
System.out.println("Student list with an ArrayList:");
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for (Document student : studentList) {
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    System.out.println(student.toJson());
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}

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Consumer<Document> printConsumer = document -> System.out.println(document.toJson());
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gradesCollection.find(gte("student_id", 10000)).forEach(printConsumer);

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List<Document> docs = gradesCollection.find(and(eq("student_id", 10001), lte("class_id", 5)))
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                                                  .projection(fields(excludeId(),
3
                                                                     include("class_id",
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                                                                             "student_id")))
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                                                  .sort(descending("class_id"))
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                                                  .skip(2)
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                                                  .limit(2)
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                                                  .into(new ArrayList<>());
9
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System.out.println("Student sorted, skipped, limited and projected: ");
11
for (Document student : docs) {
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    System.out.println(student.toJson());
13
}

1
{"student_id": 10001.0, "class_id": 3.0}
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{"student_id": 10001.0, "class_id": 2.0}

1
db.grades.createIndex({"student_id": 1, "class_id": -1})

1
"winningPlan" : {
2
            "stage" : "LIMIT",
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            "limitAmount" : 2,
4
            "inputStage" : {
5
                "stage" : "PROJECTION_COVERED",
6
                "transformBy" : {
7
                    "_id" : 0,
8
                    "class_id" : 1,
9
                    "student_id" : 1
10
                },
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                "inputStage" : {
12
                    "stage" : "SKIP",
13
                    "skipAmount" : 2,
14
                    "inputStage" : {
15
                        "stage" : "IXSCAN",
16
                        "keyPattern" : {
17
                            "student_id" : 1,
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                            "class_id" : -1
19
                        },
20
                        "indexName" : "student_id_1_class_id_-1",
21
                        "isMultiKey" : false,
22
                        "multiKeyPaths" : {
23
                            "student_id" : [ ],
24
                            "class_id" : [ ]
25
                        },
26
                        "isUnique" : false,
27
                        "isSparse" : false,
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                        "isPartial" : false,
29
                        "indexVersion" : 2,
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                        "direction" : "forward",
31
                        "indexBounds" : {
32
                            "student_id" : [
33
                                "[10001.0, 10001.0]"
34
                            ],
35
                            "class_id" : [
36
                                "[5.0, -inf.0]"
37
                            ]
38
                        }
39
                    }
40
                }
41
            }
42
        }

1
package com.mongodb.quickstart;
2
3
import com.mongodb.client.*;
4
import org.bson.Document;
5
6
import java.util.ArrayList;
7
import java.util.List;
8
import java.util.function.Consumer;
9
10
import static com.mongodb.client.model.Filters.*;
11
import static com.mongodb.client.model.Projections.*;
12
import static com.mongodb.client.model.Sorts.descending;
13
14
public class Read {
15
16
    public static void main(String[] args) {
17
        try (MongoClient mongoClient = MongoClients.create(System.getProperty("mongodb.uri"))) {
18
            MongoDatabase sampleTrainingDB = mongoClient.getDatabase("sample_training");
19
            MongoCollection<Document> gradesCollection = sampleTrainingDB.getCollection("grades");
20
21
            // find one document with new Document
22
            Document student1 = gradesCollection.find(new Document("student_id", 10000)).first();
23
            System.out.println("Student 1: " + student1.toJson());
24
25
            // find one document with Filters.eq()
26
            Document student2 = gradesCollection.find(eq("student_id", 10000)).first();
27
            System.out.println("Student 2: " + student2.toJson());
28
29
            // find a list of documents and iterate throw it using an iterator.
30
            FindIterable<Document> iterable = gradesCollection.find(gte("student_id", 10000));
31
            MongoCursor<Document> cursor = iterable.iterator();
32
            System.out.println("Student list with a cursor: ");
33
            while (cursor.hasNext()) {
34
                System.out.println(cursor.next().toJson());
35
            }
36
37
            // find a list of documents and use a List object instead of an iterator
38
            List<Document> studentList = gradesCollection.find(gte("student_id", 10000)).into(new ArrayList<>());
39
            System.out.println("Student list with an ArrayList:");
40
            for (Document student : studentList) {
41
                System.out.println(student.toJson());
42
            }
43
44
            // find a list of documents and print using a consumer
45
            System.out.println("Student list using a Consumer:");
46
            Consumer<Document> printConsumer = document -> System.out.println(document.toJson());
47
            gradesCollection.find(gte("student_id", 10000)).forEach(printConsumer);
48
49
            // find a list of documents with sort, skip, limit and projection
50
            List<Document> docs = gradesCollection.find(and(eq("student_id", 10001), lte("class_id", 5)))
51
                                                  .projection(fields(excludeId(), include("class_id", "student_id")))
52
                                                  .sort(descending("class_id"))
53
                                                  .skip(2)
54
                                                  .limit(2)
55
                                                  .into(new ArrayList<>());
56
57
            System.out.println("Student sorted, skipped, limited and projected:");
58
            for (Document student : docs) {
59
                System.out.println(student.toJson());
60
            }
61
        }
62
    }
63
}

1
package com.mongodb.quickstart;
2
3
import com.mongodb.client.MongoClient;
4
import com.mongodb.client.MongoClients;
5
import com.mongodb.client.MongoCollection;
6
import com.mongodb.client.MongoDatabase;
7
import com.mongodb.client.model.FindOneAndUpdateOptions;
8
import com.mongodb.client.model.ReturnDocument;
9
import com.mongodb.client.model.UpdateOptions;
10
import com.mongodb.client.result.UpdateResult;
11
import org.bson.Document;
12
import org.bson.conversions.Bson;
13
import org.bson.json.JsonWriterSettings;
14
15
import static com.mongodb.client.model.Filters.and;
16
import static com.mongodb.client.model.Filters.eq;
17
import static com.mongodb.client.model.Updates.*;
18
19
public class Update {
20
21
    public static void main(String[] args) {
22
        JsonWriterSettings prettyPrint = JsonWriterSettings.builder().indent(true).build();
23
24
        try (MongoClient mongoClient = MongoClients.create(System.getProperty("mongodb.uri"))) {
25
            MongoDatabase sampleTrainingDB = mongoClient.getDatabase("sample_training");
26
            MongoCollection<Document> gradesCollection = sampleTrainingDB.getCollection("grades");
27
28
            // update one document
29
            Bson filter = eq("student_id", 10000);
30
            Bson updateOperation = set("comment", "You should learn MongoDB!");
31
            UpdateResult updateResult = gradesCollection.updateOne(filter, updateOperation);
32
            System.out.println("=> Updating the doc with {\"student_id\":10000}. Adding comment.");
33
            System.out.println(gradesCollection.find(filter).first().toJson(prettyPrint));
34
            System.out.println(updateResult);
35
        }
36
    }
37
}

1
mvn compile exec:java -Dexec.mainClass="com.mongodb.quickstart.Update" -Dmongodb.uri="mongodb+srv://USERNAME:PASSWORD@cluster0-abcde.mongodb.net/test?w=majority"

1
=> Updating the doc with {"student_id":10000}. Adding comment.
2
{
3
  "_id": {
4
    "$oid": "5dd5c1f351f97d4a034109ed"
5
  },
6
  "student_id": 10000.0,
7
  "class_id": 1.0,
8
  "scores": [
9
    {
10
      "type": "exam",
11
      "score": 21.580800815091415
12
    },
13
    {
14
      "type": "quiz",
15
      "score": 87.66967927111044
16
    },
17
    {
18
      "type": "homework",
19
      "score": 96.4060480668003
20
    },
21
    {
22
      "type": "homework",
23
      "score": 75.44966835508427
24
    }
25
  ],
26
  "comment": "You should learn MongoDB!"
27
}
28
AcknowledgedUpdateResult{matchedCount=1, modifiedCount=1, upsertedId=null}

1
filter = and(eq("student_id", 10002d), eq("class_id", 10d));
2
updateOperation = push("comments", "You will learn a lot if you read the MongoDB blog!");
3
UpdateOptions options = new UpdateOptions().upsert(true);
4
updateResult = gradesCollection.updateOne(filter, updateOperation, options);
5
System.out.println("\n=> Upsert document with {\"student_id\":10002.0, \"class_id\": 10.0} because it doesn't exist yet.");
6
System.out.println(updateResult);
7
System.out.println(gradesCollection.find(filter).first().toJson(prettyPrint));

1
=> Upsert document with {"student_id":10002.0, "class_id": 10.0} because it doesn't exist yet.
2
AcknowledgedUpdateResult{matchedCount=0, modifiedCount=0, upsertedId=BsonObjectId{value=5ddeb7b7224ad1d5cfab3733}}
3
{
4
  "_id": {
5
    "$oid": "5ddeb7b7224ad1d5cfab3733"
6
  },
7
  "class_id": 10.0,
8
  "student_id": 10002.0,
9
  "comments": [
10
    "You will learn a lot if you read the MongoDB blog!"
11
  ]
12
}

1
filter = eq("student_id", 10001);
2
updateResult = gradesCollection.updateMany(filter, updateOperation);
3
System.out.println("\n=> Updating all the documents with {\"student_id\":10001}.");
4
System.out.println(updateResult);

1
=> Updating all the documents with {"student_id":10001}.
2
AcknowledgedUpdateResult{matchedCount=10, modifiedCount=10, upsertedId=null}

1
// findOneAndUpdate
2
filter = eq("student_id", 10000);
3
Bson update1 = inc("x", 10); // increment x by 10. As x doesn't exist yet, x=10.
4
Bson update2 = rename("class_id", "new_class_id"); // rename variable "class_id" in "new_class_id".
5
Bson update3 = mul("scores.0.score", 2); // multiply the first score in the array by 2.
6
Bson update4 = addToSet("comments", "This comment is uniq"); // creating an array with a comment.
7
Bson update5 = addToSet("comments", "This comment is uniq"); // using addToSet so no effect.
8
Bson updates = combine(update1, update2, update3, update4, update5);
9
// returns the old version of the document before the update.
10
Document oldVersion = gradesCollection.findOneAndUpdate(filter, updates);
11
System.out.println("\n=> FindOneAndUpdate operation. Printing the old version by default:");
12
System.out.println(oldVersion.toJson(prettyPrint));
13
14
// but I can also request the new version
15
filter = eq("student_id", 10001);
16
FindOneAndUpdateOptions optionAfter = new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER);
17
Document newVersion = gradesCollection.findOneAndUpdate(filter, updates, optionAfter);
18
System.out.println("\n=> FindOneAndUpdate operation. But we can also ask for the new version of the doc:");
19
System.out.println(newVersion.toJson(prettyPrint));

1
=> FindOneAndUpdate operation. Printing the old version by default:
2
{
3
  "_id": {
4
    "$oid": "5dd5d46544fdc35505a8271b"
5
  },
6
  "student_id": 10000.0,
7
  "class_id": 1.0,
8
  "scores": [
9
    {
10
      "type": "exam",
11
      "score": 69.52994626959251
12
    },
13
    {
14
      "type": "quiz",
15
      "score": 87.27457417188077
16
    },
17
    {
18
      "type": "homework",
19
      "score": 83.40970667948744
20
    },
21
    {
22
      "type": "homework",
23
      "score": 40.43663797673247
24
    }
25
  ],
26
  "comment": "You should learn MongoDB!"
27
}
28
29
=> FindOneAndUpdate operation. But we can also ask for the new version of the doc:
30
{
31
  "_id": {
32
    "$oid": "5dd5d46544fdc35505a82725"
33
  },
34
  "student_id": 10001.0,
35
  "scores": [
36
    {
37
      "type": "exam",
38
      "score": 138.42535412437857
39
    },
40
    {
41
      "type": "quiz",
42
      "score": 84.66740178906916
43
    },
44
    {
45
      "type": "homework",
46
      "score": 36.773091359279675
47
    },
48
    {
49
      "type": "homework",
50
      "score": 14.90842128691825
51
    }
52
  ],
53
  "comments": [
54
    "You will learn a lot if you read the MongoDB blog!",
55
    "This comment is uniq"
56
  ],
57
  "new_class_id": 10.0,
58
  "x": 10
59
}

1
package com.mongodb.quickstart;
2
3
import com.mongodb.client.MongoClient;
4
import com.mongodb.client.MongoClients;
5
import com.mongodb.client.MongoCollection;
6
import com.mongodb.client.MongoDatabase;
7
import com.mongodb.client.model.FindOneAndUpdateOptions;
8
import com.mongodb.client.model.ReturnDocument;
9
import com.mongodb.client.model.UpdateOptions;
10
import com.mongodb.client.result.UpdateResult;
11
import org.bson.Document;
12
import org.bson.conversions.Bson;
13
import org.bson.json.JsonWriterSettings;
14
15
import static com.mongodb.client.model.Filters.and;
16
import static com.mongodb.client.model.Filters.eq;
17
import static com.mongodb.client.model.Updates.*;
18
19
public class Update {
20
21
    public static void main(String[] args) {
22
        JsonWriterSettings prettyPrint = JsonWriterSettings.builder().indent(true).build();
23
24
        try (MongoClient mongoClient = MongoClients.create(System.getProperty("mongodb.uri"))) {
25
            MongoDatabase sampleTrainingDB = mongoClient.getDatabase("sample_training");
26
            MongoCollection<Document> gradesCollection = sampleTrainingDB.getCollection("grades");
27
28
            // update one document
29
            Bson filter = eq("student_id", 10000);
30
            Bson updateOperation = set("comment", "You should learn MongoDB!");
31
            UpdateResult updateResult = gradesCollection.updateOne(filter, updateOperation);
32
            System.out.println("=> Updating the doc with {\"student_id\":10000}. Adding comment.");
33
            System.out.println(gradesCollection.find(filter).first().toJson(prettyPrint));
34
            System.out.println(updateResult);
35
36
            // upsert
37
            filter = and(eq("student_id", 10002d), eq("class_id", 10d));
38
            updateOperation = push("comments", "You will learn a lot if you read the MongoDB blog!");
39
            UpdateOptions options = new UpdateOptions().upsert(true);
40
            updateResult = gradesCollection.updateOne(filter, updateOperation, options);
41
            System.out.println("\n=> Upsert document with {\"student_id\":10002.0, \"class_id\": 10.0} because it doesn't exist yet.");
42
            System.out.println(updateResult);
43
            System.out.println(gradesCollection.find(filter).first().toJson(prettyPrint));
44
45
            // update many documents
46
            filter = eq("student_id", 10001);
47
            updateResult = gradesCollection.updateMany(filter, updateOperation);
48
            System.out.println("\n=> Updating all the documents with {\"student_id\":10001}.");
49
            System.out.println(updateResult);
50
51
            // findOneAndUpdate
52
            filter = eq("student_id", 10000);
53
            Bson update1 = inc("x", 10); // increment x by 10. As x doesn't exist yet, x=10.
54
            Bson update2 = rename("class_id", "new_class_id"); // rename variable "class_id" in "new_class_id".
55
            Bson update3 = mul("scores.0.score", 2); // multiply the first score in the array by 2.
56
            Bson update4 = addToSet("comments", "This comment is uniq"); // creating an array with a comment.
57
            Bson update5 = addToSet("comments", "This comment is uniq"); // using addToSet so no effect.
58
            Bson updates = combine(update1, update2, update3, update4, update5);
59
            // returns the old version of the document before the update.
60
            Document oldVersion = gradesCollection.findOneAndUpdate(filter, updates);
61
            System.out.println("\n=> FindOneAndUpdate operation. Printing the old version by default:");
62
            System.out.println(oldVersion.toJson(prettyPrint));
63
64
            // but I can also request the new version
65
            filter = eq("student_id", 10001);
66
            FindOneAndUpdateOptions optionAfter = new FindOneAndUpdateOptions().returnDocument(ReturnDocument.AFTER);
67
            Document newVersion = gradesCollection.findOneAndUpdate(filter, updates, optionAfter);
68
            System.out.println("\n=> FindOneAndUpdate operation. But we can also ask for the new version of the doc:");
69
            System.out.println(newVersion.toJson(prettyPrint));
70
        }
71
    }
72
}

1
package com.mongodb.quickstart;
2
3
import com.mongodb.client.MongoClient;
4
import com.mongodb.client.MongoClients;
5
import com.mongodb.client.MongoCollection;
6
import com.mongodb.client.MongoDatabase;
7
import com.mongodb.client.result.DeleteResult;
8
import org.bson.Document;
9
import org.bson.conversions.Bson;
10
11
import static com.mongodb.client.model.Filters.eq;
12
import static com.mongodb.client.model.Filters.gte;
13
14
public class Delete {
15
16
    public static void main(String[] args) {
17
18
        try (MongoClient mongoClient = MongoClients.create(System.getProperty("mongodb.uri"))) {
19
            MongoDatabase sampleTrainingDB = mongoClient.getDatabase("sample_training");
20
            MongoCollection<Document> gradesCollection = sampleTrainingDB.getCollection("grades");
21
22
            // delete one document
23
            Bson filter = eq("student_id", 10000);
24
            DeleteResult result = gradesCollection.deleteOne(filter);
25
            System.out.println(result);
26
        }
27
    }
28
}

1
mvn compile exec:java -Dexec.mainClass="com.mongodb.quickstart.Delete" -Dmongodb.uri="mongodb+srv://USERNAME:PASSWORD@cluster0-abcde.mongodb.net/test?w=majority"

1
AcknowledgedDeleteResult{deletedCount=1}

1
Bson filter = eq("student_id", 10002);
2
Document doc = gradesCollection.findOneAndDelete(filter);
3
System.out.println(doc.toJson(JsonWriterSettings.builder().indent(true).build()));

1
{
2
  "_id": {
3
    "$oid": "5ddec378224ad1d5cfac02b8"
4
  },
5
  "class_id": 10.0,
6
  "student_id": 10002.0,
7
  "comments": [
8
    "You will learn a lot if you read the MongoDB blog!"
9
  ]
10
}

1
Bson filter = gte("student_id", 10000);
2
DeleteResult result = gradesCollection.deleteMany(filter);
3
System.out.println(result);

1
AcknowledgedDeleteResult{deletedCount=10}

1
gradesCollection.drop();

1
package com.mongodb.quickstart;
2
3
import com.mongodb.client.MongoClient;
4
import com.mongodb.client.MongoClients;
5
import com.mongodb.client.MongoCollection;
6
import com.mongodb.client.MongoDatabase;
7
import com.mongodb.client.result.DeleteResult;
8
import org.bson.Document;
9
import org.bson.conversions.Bson;
10
import org.bson.json.JsonWriterSettings;
11
12
import static com.mongodb.client.model.Filters.eq;
13
import static com.mongodb.client.model.Filters.gte;
14
15
public class Delete {
16
17
    public static void main(String[] args) {
18
        try (MongoClient mongoClient = MongoClients.create(System.getProperty("mongodb.uri"))) {
19
            MongoDatabase sampleTrainingDB = mongoClient.getDatabase("sample_training");
20
            MongoCollection<Document> gradesCollection = sampleTrainingDB.getCollection("grades");
21
22
            // delete one document
23
            Bson filter = eq("student_id", 10000);
24
            DeleteResult result = gradesCollection.deleteOne(filter);
25
            System.out.println(result);
26
27
            // findOneAndDelete operation
28
            filter = eq("student_id", 10002);
29
            Document doc = gradesCollection.findOneAndDelete(filter);
30
            System.out.println(doc.toJson(JsonWriterSettings.builder().indent(true).build()));
31
32
            // delete many documents
33
            filter = gte("student_id", 10000);
34
            result = gradesCollection.deleteMany(filter);
35
            System.out.println(result);
36
37
            // delete the entire collection and its metadata (indexes, chunk metadata, etc).
38
            gradesCollection.drop();
39
        }
40
    }
41
}