JAVA JDBC 常规增删改查简单封装,可满足大多基本要求

作用：

1， 查询列表是直接返回List对象，不必再遍历；

2， 单条查询直接返回对象；

3， 执行sql仅需一个方法搞定；

package com.Main.Tools;

import com.Main.DB.MySql.DBUtil;

import java.sql.*;

import java.util.ArrayList;

import java.util.Date;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

/**

* @Description: JDBC辅佐工具类

* @author: Adobe Chow

* @date: 2018/12/29 16:02

* @Copyright: www.winshang.com Inc. All rights reserved.

*/

public class SqlUtils {

private static final String LogName = "SqlUtils----> ";

/**

* 执行sql

* @param conn

* @param sql

* @param args

* @throws SQLException

*/

public static void execute(Connection conn,String sql,Object ...args) throws SQLException {

PreparedStatement ptmt = null;

ptmt = conn.prepareStatement(sql);

String para = setParam(ptmt,args);

System.out.println(LogName+"sql: "+sql);

System.out.println(LogName+"参数: "+para);

ptmt.execute();

ptmt.close();

System.out.println(LogName+"执行成功！");

}

/**

* 查询列表

* @param conn

* @param sql

* @param args

* @return

* @throws SQLException

*/

public static List> findList(Connection conn,String sql,Object...args) {

List> list = new ArrayList<>();

PreparedStatement ptmt = null;

try {

ptmt = conn.prepareStatement(sql);

System.out.println(LogName+"sql: "+sql);

String para = setParam(ptmt,args);

System.out.println(LogName+"sql: "+sql);

System.out.println(LogName+"参数: "+para);

ResultSet resultSet = ptmt.executeQuery();

ResultSetMetaData rsmd=resultSet.getMetaData();

while (resultSet.next()){

Map map = new HashMap<>();

for(int i=0;i

String columnLabel=rsmd.getColumnLabel(i+1);

Object columnValue=resultSet.getObject(columnLabel);

map.put(columnLabel, columnValue);

}

list.add(map);

}

if (list.size()==0){

return null;

}

return list;

} catch (SQLException e) {

e.printStackTrace();

}finally {

try {

ptmt.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

return null;

}

/**

* 查询单条数据

* @param conn

* @param sql

* @param args

* @return

* @throws SQLException

*/

public static Map findFirst(Connection conn,String sql,Object...args) {

List> list = findList(conn,sql+" limit 1",args);

return list==null?null:list.get(0);

}

/**

* 设置参数

* @param ptmt

* @param args

* @return

*/

private static String setParam(PreparedStatement ptmt, Object[] args) throws SQLException {

//加入参数

String parasStr = "";

if (args!=null){

for(int i=0;i

ptmt.setObject(i+1, args[i]);

parasStr=parasStr+" "+args[i];

}

}

return parasStr;

}

public static void main(String[] args) {

//执行sql

String sql = "INSERT INTO `biz_t_error` ( `uid`, `bunkId`, `errType`, `errMsg`, `errUrl`, `addtime`, `errSql`) VALUES (?, '3250', '匹配错误', '测试插入啦啦啦！', 'http://data.winshang.com/Pipei_Pp.aspx', ?, 'zdb 测试数据');";

try {

execute(DBUtil.getConnection(),sql,"1314",new Date());

} catch (SQLException e) {

e.printStackTrace();

}

//查询列表

List> list = findList(DBUtil.getConnection(),"select * from biz_t_error LIMIT 100",null);

for (int i=0;i

System.out.println("多条记录："+list.get(i).get("errMsg"));

}

//查询单条记录

Map map = findFirst(DBUtil.getConnection(),"select * from biz_t_error order by addtime desc",null);

System.out.println( "单条记录： "+ map.get("uid")+" "+map.get("errMsg") );

}

}