JAVA JDBC 常规增删改查简单封装

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

        2， 单条查询直接返回

        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 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> list = findList(DBUtil.getConnection(),"select * from biz_t_error LIMIT 100",null);
        for (int i=0;i 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") );
    }

}