Mysql连接数据库封装类

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package com.util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
/**
* 封装数据常用操作
*
* @author 刘鹏
*
*/
public class DbUtil {
/**
* 取得Connection
*
* @return
*/
public static final String DBDRIVER="com.mysql.jdbc.Driver";
public static final String DBURL="jdbc:mysql://localhost:3306/lp";
public static final String DBUSER="root";
public static final String DBPASS="mysqladmin";
public static Connection conn = null;
public static Statement pstm = null;
public static PreparedStatement pstmt = null;
/**
* 取得数据库连接
* @return
*/
public static Connection getConnection(){
try{
Class.forName(DBDRIVER);
}catch(ClassNotFoundException e){
e.printStackTrace();
}
try{
conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS);
}catch(SQLException e){
e.printStackTrace();
}
return conn;
}
/**
* 数据库操作
* @return
*/
public static Statement getStatement(Connection con){
//con = DbUtil.getConnection();
try {
if (con != null) {
pstm = con.createStatement();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return pstm;
}
/**
* 数据库操作
* @return
*/
public static PreparedStatement getPstmt(Connection con,String sql) {
//con = DbUtil.getConnection();
if (con != null) {
try {
pstmt = conn.prepareStatement(sql);
} catch (SQLException e) {
e.printStackTrace();
}
}
return pstmt;
}
/**
* 查询操作，基于PreparedStatement接口
* @param conn
* @param sql
* @return
*/
public static ResultSet getResultSet(Connection conn,String sql){
pstmt = DbUtil.getPreparedStatement(conn, sql);
try {
rs = pstmt.executeQuery();
} catch (SQLException e) {
e.printStackTrace();
}
return rs;
}
/**
* 关闭数据库连接
* @param conn
*/
public static void close(Connection conn){
if(conn!=null){
try{
conn.close();
}catch(SQLException e){
e.printStackTrace();
}
}
}
/**
* 关闭数据库操作Statement
* @param stmt
*/
public static void close(Statement stmt){
if(stmt!=null){
try{
stmt.close();
}catch(SQLException e){
e.printStackTrace();
}
}
}
/**
* 关闭数据库操作PreparedStatement
* @param pstmt
*/
public static void close(PreparedStatement pstmt){
if(pstmt!=null){
try{
pstmt.close();
}catch(SQLException e){
e.printStackTrace();
}
}
}
/**
* 关闭数据库查询
* @param rs
*/
public static void close(ResultSet rs){
if(rs!=null){
try{
rs.close();
}catch(SQLException e){
e.printStackTrace();
}
}
}
/**
* 主方法用于测试
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println(DbUtil.getConnection());
}
}

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