Java 操作MongoDb 增刪改查
阿新 • • 發佈:2018-12-24
注:此文基於mongoDb API 3.2.0進行的測試。
測試程式碼如下:
pom.xml檔案
MongoDb API 類:<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>mongo</groupId> <artifactId>mongodb</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>mongodb</name> <url>http://maven.apache.org</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <dependency> <groupId>org.mongodb</groupId> <artifactId>mongo-java-driver</artifactId> <version>3.2.0</version> </dependency> </dependencies> </project>
package mongo.mongodb; import java.util.ArrayList; import java.util.List; import org.bson.Document; import org.bson.conversions.Bson; import com.mongodb.MongoClient; import com.mongodb.client.FindIterable; import com.mongodb.client.MongoCollection; import com.mongodb.client.MongoCursor; import com.mongodb.client.MongoDatabase; import com.mongodb.client.result.UpdateResult; public class MongoDb { private static MongoCollection<Document> collection; /** * 連結資料庫 * * @param databaseName * 資料庫名稱 * @param collectionName * 集合名稱 * @param hostName * 主機名 * @param port * 埠號 */ public static void connect(String databaseName, String collectionName, String hostName, int port) { @SuppressWarnings("resource") MongoClient client = new MongoClient(hostName, port); MongoDatabase db = client.getDatabase(databaseName); collection = db.getCollection(collectionName); System.out.println(collection); } /** * 插入一個文件 * * @param document * 文件 */ public static void insert(Document document) { collection.insertOne(document); } /** * 查詢所有文件 * * @return 所有文件集合 */ public static List<Document> findAll() { List<Document> results = new ArrayList<Document>(); FindIterable<Document> iterables = collection.find(); MongoCursor<Document> cursor = iterables.iterator(); while (cursor.hasNext()) { results.add(cursor.next()); } return results; } /** * 根據條件查詢 * * @param filter * 查詢條件 //注意Bson的幾個實現類,BasicDBObject, BsonDocument, * BsonDocumentWrapper, CommandResult, Document, RawBsonDocument * @return 返回集合列表 */ public static List<Document> findBy(Bson filter) { List<Document> results = new ArrayList<Document>(); FindIterable<Document> iterables = collection.find(filter); MongoCursor<Document> cursor = iterables.iterator(); while (cursor.hasNext()) { results.add(cursor.next()); } return results; } /** * 更新查詢到的第一個 * * @param filter * 查詢條件 * @param update * 更新文件 * @return 更新結果 */ public static UpdateResult updateOne(Bson filter, Bson update) { UpdateResult result = collection.updateOne(filter, update); return result; } /** * 更新查詢到的所有的文件 * * @param filter * 查詢條件 * @param update * 更新文件 * @return 更新結果 */ public static UpdateResult updateMany(Bson filter, Bson update) { UpdateResult result = collection.updateMany(filter, update); return result; } /** * 更新一個文件, 結果是replacement是新文件,老文件完全被替換 * * @param filter * 查詢條件 * @param replacement * 跟新文件 */ public static void replace(Bson filter, Document replacement) { collection.replaceOne(filter, replacement); } /** * 根據條件刪除一個文件 * * @param filter * 查詢條件 */ public static void deleteOne(Bson filter) { collection.deleteOne(filter); } /** * 根據條件刪除多個文件 * * @param filter * 查詢條件 */ public static void deleteMany(Bson filter) { collection.deleteMany(filter); } }
測試類:
package mongo.mongodb; import java.util.List; import org.bson.Document; import org.junit.Before; import org.junit.Test; import com.mongodb.client.result.UpdateResult; public class MongoTest { @Before public void before(){ MongoDb.connect("test", "darren", "172.16.155.151", 27017); } @Test public void testInsert(){ Document document = new Document(); document.append("name", "wang").append("gender", "female"); MongoDb.insert(document); } @Test public void testFindAll(){ List<Document> results = MongoDb.findAll(); for(Document doc : results){ System.out.println(doc.toJson()); } } @Test public void testFindBy(){ Document filter = new Document(); filter.append("name", "li si"); List<Document> results = MongoDb.findBy(filter); for(Document doc : results){ System.out.println(doc.toJson()); } } @Test public void testUpdateOne(){ Document filter = new Document(); filter.append("gender", "male"); //注意update文件裡要包含"$set"欄位 Document update = new Document(); update.append("$set", new Document("gender", "female")); UpdateResult result = MongoDb.updateOne(filter, update); System.out.println("matched count = " + result.getMatchedCount()); } @Test public void testUpdateMany(){ Document filter = new Document(); filter.append("gender", "female"); //注意update文件裡要包含"$set"欄位 Document update = new Document(); update.append("$set", new Document("gender", "male")); UpdateResult result = MongoDb.updateMany(filter, update); System.out.println("matched count = " + result.getMatchedCount()); } @Test public void testReplace(){ Document filter = new Document(); filter.append("name", "zhang"); //注意:更新文件時,不需要使用"$set" Document replacement = new Document(); replacement.append("value", 123); MongoDb.replace(filter, replacement); } @Test public void testDeleteOne(){ Document filter = new Document(); filter.append("name", "li"); MongoDb.deleteOne(filter); } @Test public void testDeleteMany(){ Document filter = new Document(); filter.append("gender", "male"); MongoDb.deleteMany(filter); } }
官方幫助文件:https://docs.mongodb.org/getting-started/java/