mongodb Java（八）
package com.mongodb.text; import java.net.UnknownHostException; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; import com.mongodb.Mongo; import com.mongodb.MongoException; import com.mongodb.util.JSON; public class DataBase { public static void main(String[] args) throws UnknownHostException, MongoException { //1.建立一个Mongo的数据库连接对象 Mongo mg = new Mongo("127.0.0.1:27017"); //查询所有的Database for (String name : mg.getDatabaseNames()) { System.out.println("dbName: " + name); } //2.创建相关数据库的连接 DB db = mg.getDB("foobar"); //查询数据库所有的集合 for (String name : db.getCollectionNames()) { System.out.println("collectionName: " + name); } DBCollection users = db.getCollection("persons"); //查询所有的数据 DBCursor cur = users.find(); while (cur.hasNext()) { DBObject object = cur.next(); System.out.println(object.get("name")); } System.out.println(cur.count()); System.out.println(cur.getCursorId()); System.out.println(JSON.serialize(cur)); } }
package com.mongodb.text; import java.net.UnknownHostException; import java.util.List; import org.bson.types.ObjectId; import com.mongodb.BasicDBObject; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.DBCursor; import com.mongodb.DBObject; import com.mongodb.Mongo; import com.mongodb.MongoException; public class MongoDb { //1.建立一个Mongo的数据库连接对象 static Mongo connection = null; //2.创建相关数据库的连接 static DB db = null; public MongoDb(String dbName) throws UnknownHostException, MongoException{ connection = new Mongo("127.0.0.1:27017"); db = connection.getDB(dbName); } public static void main(String[] args) throws UnknownHostException, MongoException { //实例化 MongoDb mongoDb = new MongoDb("foobar"); /** * 1.创建一个名字叫javadb的数据库 */ // mongoDb.createCollection("javadb"); /** * 2.为集合javadb添加一条数据 */ // DBObject dbs = new BasicDBObject(); // dbs.put("name", "uspcat.com"); // dbs.put("age", 2); // List<String> books = new ArrayList<String>(); // books.add("EXTJS"); // books.add("MONGODB"); // dbs.put("books", books); // mongoDb.insert(dbs, "javadb"); /** * 3.批量插入数据 */ // List<DBObject> dbObjects = new ArrayList<DBObject>(); // DBObject jim = new BasicDBObject("name","jim"); // DBObject lisi = new BasicDBObject("name","lisi"); // dbObjects.add(jim); // dbObjects.add(lisi); // mongoDb.insertBatch(dbObjects, "javadb"); /** * 4.根据ID删除数据 */ // mongoDb.deleteById("502870dab9c368bf5b151a04", "javadb"); /** * 5.根据条件删除数据 */ // DBObject lisi = new BasicDBObject(); // lisi.put("name", "lisi"); // int count = mongoDb.deleteByDbs(lisi, "javadb"); // System.out.println("删除数据的条数是: "+count); /** * 6.更新操作,为集合增加email属性 */ // DBObject update = new BasicDBObject(); // update.put("$set", // new BasicDBObject("eamil","uspcat@126.com")); // mongoDb.update(new BasicDBObject(), // update,false,true,"javadb"); /** * 7.查询出persons集合中的name和age */ // DBObject keys = new BasicDBObject(); // keys.put("_id", false); // keys.put("name", true); // keys.put("age", true); // DBCursor cursor = mongoDb.find(null, keys, "persons"); // while (cursor.hasNext()) { // DBObject object = cursor.next(); // System.out.println(object.get("name")); // } /** * 7.查询出年龄大于26岁并且英语成绩小于80分 */ // DBObject ref = new BasicDBObject(); // ref.put("age", new BasicDBObject("$gte",26)); // ref.put("e", new BasicDBObject("$lte",80)); // DBCursor cursor = mongoDb.find(ref, null, "persons"); // while (cursor.hasNext()) { // DBObject object = cursor.next(); // System.out.print(object.get("name")+"-->"); // System.out.print(object.get("age")+"-->"); // System.out.println(object.get("e")); // } /** * 8.分页例子 */ DBCursor cursor = mongoDb.find(null, null, 0, 3, "persons"); while (cursor.hasNext()) { DBObject object = cursor.next(); System.out.print(object.get("name")+"-->"); System.out.print(object.get("age")+"-->"); System.out.println(object.get("e")); } //关闭连接对象 connection.close(); } /** * 穿件一个数据库集合 * @param collName 集合名称 * @param db 数据库实例 */ public void createCollection(String collName){ DBObject dbs = new BasicDBObject(); db.createCollection("javadb", dbs); } /** * 为相应的集合添加数据 * @param dbs * @param collName */ public void insert(DBObject dbs,String collName){ //1.得到集合 DBCollection coll = db.getCollection(collName); //2.插入操作 coll.insert(dbs); } /** * 为集合批量插入数据 * @param dbses * @param collName */ public void insertBatch(List<DBObject> dbses,String collName){ //1.得到集合 DBCollection coll = db.getCollection(collName); //2.插入操作 coll.insert(dbses); } /** * 根据id删除数据 * @param id * @param collName * @return 返回影响的数据条数 */ public int deleteById(String id,String collName){ //1.得到集合 DBCollection coll = db.getCollection(collName); DBObject dbs = new BasicDBObject("_id", new ObjectId(id)); int count = coll.remove(dbs).getN(); return count; } /** * 根据条件删除数据 * @param id * @param collName * @return 返回影响的数据条数 */ public int deleteByDbs(DBObject dbs,String collName){ //1.得到集合 DBCollection coll = db.getCollection(collName); int count = coll.remove(dbs).getN(); return count; } /** * 更新数据 * @param find 查询器 * @param update 更新器 * @param upsert 更新或插入 * @param multi 是否批量更新 * @param collName 集合名称 * @return 返回影响的数据条数 */ public int update(DBObject find, DBObject update, boolean upsert, boolean multi, String collName){ //1.得到集合 DBCollection coll = db.getCollection(collName); int count = coll.update(find, update, upsert, multi).getN(); return count; } /** * 查询器(分页) * @param ref * @param keys * @param start * @param limit * @return */ public DBCursor find(DBObject ref, DBObject keys, int start, int limit, String collName){ DBCursor cur = find(ref, keys, collName); return cur.limit(limit).skip(start); } /** * 查询器(不分页) * @param ref * @param keys * @param start * @param limit * @param collName * @return */ public DBCursor find(DBObject ref, DBObject keys, String collName){ //1.得到集合 DBCollection coll = db.getCollection(collName); DBCursor cur = coll.find(ref, keys); return cur; } }
1、下载mongodb对Java的驱动
