本文实例讲述了Java操作Mongodb数据库实现数据的增删查改功能。分享给大家供大家参考，具体如下：
首先，我们在windows下安装mongodb数据库，安装教程可查看前面一篇文章：https://www.zzvips.com/article/63476.html
代码如下：
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package io.mogo;
import java.util.Map;
import org.apache.commons.lang3.StringUtils;
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.WriteResult;
/**
* Hello world!
*
*/
public class App
{
private static final String host = "localhost";
private static final int port = 27017;
private static final String userName = "";
private static final String password = "";
private static final String dataBaseName = "test";
private static DB db;
public static void main( String[] args ) throws Exception
{
System.out.println( "Hello World!" );
connMongoDB();
find("person", "name", "xiaoming");
DBObject newObj = new BasicDBObject();
newObj.put("name", "xiaoming");
newObj.put("desc", "i am xiaoming");
update("person", "name", "xiaoming", newObj);
find("person", "name", "xiaoming");
}
public static void connMongoDB() throws Exception {
Mongo mongo = new Mongo(host, port);
db = mongo.getDB(dataBaseName);
if (!StringUtils.isEmpty(userName) || !StringUtils.isEmpty(password)) {
db.authenticate(userName, password.toCharArray());
}
}
public static void find(String tableName, String key, String value){
DBObject obj = new BasicDBObject();
obj.put(key, value);
DBCollection dbCollection = db.getCollection(tableName);
DBCursor dbCursor = dbCollection.find(obj);
while(dbCursor.hasNext()){
Map map = (Map)dbCursor.next();
System.out.println(map);
}
}
public static boolean delete(String tableName, String key, String value){
DBObject obj = new BasicDBObject();
obj.put(key, value);
DBCollection dbCollection = db.getCollection(tableName);
WriteResult result = dbCollection.remove(obj);
if(result.getN() > 0){
System.out.println("删除数据成功！");
return true;
}else{
return false;
}
}
public static boolean insert(String tableName, DBObject obj){
DBCollection dbCollection = db.getCollection(tableName);
long num = dbCollection.count();
dbCollection.insert(obj);
if(dbCollection.count() - num > 0){
System.out.println("插入数据成功！");
return true;
}else{
return false;
}
}
public static boolean update(String tableName, String key, String value, DBObject newValue){
DBObject obj = new BasicDBObject();
obj.put(key, value);
DBCollection dbCollection = db.getCollection(tableName);
DBObject oldValue = dbCollection.findOne(obj);
WriteResult result = dbCollection.update(oldValue, newValue);
if(result.getN() > 0){
System.out.println("数据更新成功！");
return true;
}else
return false;
}
}
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附：完整实例代码点击此处本站下载。
希望本文所述对大家java程序设计有所帮助。
原文链接：http://blog.csdn.net/zwc2xm/article/details/72869590
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