java中简单的db封装

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;

}

}

}

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