java中简单的db封装

浏览数：23 / 时间：2015年06月12日

package com.melin.bbs;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class DB {

//建立连接

    public static Connection getConn(){
        Connection conn=null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
           e.printStackTrace();

        }
        try {
       conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/bbs","root","root");
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return conn;
    }

//SQL语句发送到数据库

     public static Statement getStmt(Connection conn){
        Statement stmt=null;
        try {
            stmt=conn.createStatement();
        } catch (SQLException e) {
           e.printStackTrace();
        }
        return stmt;
    }

//返回结果集
    public static ResultSet getRs(Statement stmt,String sql){
        ResultSet rs=null;
        try {
            rs=stmt.executeQuery(sql);
        } catch (SQLException e) {
             e.printStackTrace();
        }
        return rs;
    }

//关闭连接

    public static void close(Connection conn){
        if(conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            conn=null;
        }
    }

    public static void close(ResultSet rs){
        if(rs!=null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            rs=null;
        }
    }

    public static void close(Statement stmt){
        if(stmt!=null){
            try {
                stmt.close();
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            stmt=null;
        }
    }
}