java操作mongoDB实现CURD

java操作mongoDB
mongoDB作为一个牛气哄哄的nosql内存数据库，的确有很多优点，对于大数据量、高并发、弱事务的互联网应用，MongoDB可以应对自如。接触到mongoDB 参考了下api实现了增删改查、mongoDB 是面向对象设计，不用写sql语句 直接操作api 方法 就可以实现，这会儿数据库语句写不好的娃娃们有福了。直接贴码：

DataTest.java

package com.zk.db;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;
import org.bson.types.ObjectId;
import org.junit.Test;
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;
/**
 * 测试mongodb curd
 * @author zk
 * @time   2015年4月24日23:19:15
 */
public class DataTest {
    // 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;

    static {
        try {
            connection = new Mongo("127.0.0.1:27017"); //默认链接地址
        } catch (Exception e) {
            e.printStackTrace();
        }
        db = connection.getDB("one");//获取数据库名称
    }

    /**
     * 测试创建数据文档集合 类似 数据表 person
     * @throws UnknownHostException
     * @throws MongoException
     */
    @Test
    public void test1() throws UnknownHostException, MongoException {
        // 实例化
        MongoDb mongoDb = new MongoDb("one");
        mongoDb.createCollection("person");

    }

    /**
     * 测试添加一条记录
     * 
     * @throws UnknownHostException
     * @throws MongoException
     */
    @Test
    public void test2() throws UnknownHostException, MongoException {
        // 实例化
        DBObject p1 = new BasicDBObject();
        p1.put("name", "zk00");
        insert(p1, "person");

    }

    /**
     * 测试添加一条记录
     * 
     * @throws UnknownHostException
     * @throws MongoException
     */
    @Test
    public void test3() throws UnknownHostException, MongoException {
        List<DBObject> dbObjects = new ArrayList<DBObject>();
        DBObject zs = new BasicDBObject("name", "zhaosi");
        DBObject zq = new BasicDBObject("name", "zhuqi");
        dbObjects.add(zs);
        dbObjects.add(zq);
        insertBatch(dbObjects, "person");

    }

    /**
     * 测试 根据id 删除一条记录
     * 
     * @throws UnknownHostException
     * @throws MongoException
     */
    @Test
    public void test4() throws UnknownHostException, MongoException {

        deleteById("553a5accb9d133bcf4056a40", "person");

    }

    /**
     * 测试 根据条件 删除
     * 
     * @throws UnknownHostException
     * @throws MongoException
     */
    @Test
    public void test5() throws UnknownHostException, MongoException {

        DBObject obj = new BasicDBObject();
        obj.put("name", "zk00");
        int count = deleteByDbs(obj, "person");
        System.out.println("删除数据的条数是: " + count);
    }

    /**
     * 测试 更新操作
     * 
     * @throws UnknownHostException
     * @throws MongoException
     */
    @Test
    public void test6() throws UnknownHostException, MongoException {
        DBObject obj = new BasicDBObject();
        obj.put("name", "zhaosi");
        DBObject update = new BasicDBObject();
        update.put("$set", new BasicDBObject("name", "nn1"));
        update(obj, update, false, true, "person");
    }

    /**
     * 测试 查询出person集合中的name
     * 
     * @throws UnknownHostException
     * @throws MongoException
     */
    @Test
    public void test7() throws UnknownHostException, MongoException {
        DBObject keys = new BasicDBObject();
        keys.put("_id", false);
        keys.put("name", true);
        DBCursor cursor = find(null, keys, "person");
        while (cursor.hasNext()) {
            DBObject object = cursor.next();
            System.out.println(object.get("name"));
        }
    }

    /**
     * 测试 分页
     * 
     * @throws UnknownHostException
     * @throws MongoException
     */
    @Test
    public void test8() throws UnknownHostException, MongoException {
        DBCursor cursor = find(null, null, 0, 6, "person");
        while (cursor.hasNext()) {
            DBObject object = cursor.next();
            System.out.print("name=" + object.get("name") + "  ");
            System.out.println("_id=" + object.get("_id"));

        }
    }

    /**
     * 创建一个数据库集合
     * 
     * @param collName
     *            集合名称
     * @param db
     *            数据库实例
     */
    public void createCollection(String collName) {
        DBObject dbs = new BasicDBObject();
        db.createCollection("person", 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) {
        DBCollection coll = db.getCollection(collName);
        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) {
        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) {
        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) {
        DBCollection coll = db.getCollection(collName);
        int count = coll.update(find, update, upsert, multi).getN();
        return count;
    }

    /**
     * 查询(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 (不分页)
     * @param ref
     * @param keys
     * @param start
     * @param limit
     * @param collName
     * @return
     */
    public DBCursor find(DBObject ref, DBObject keys, String collName) {
        DBCollection coll = db.getCollection(collName);
        DBCursor cur = coll.find(ref, keys);
        return cur;
    }
}

注意：connection.close();最后别忘记调用，另外 做过java的同学都知道连接池 以及释放回收链接问题。mongodb自动内部实现了连接池。不需要再考虑该问题，也可以自行实现设置。