数据库java包

package com.hgkj.model.dao.impl;

import java.sql.*;

public class DBManager {
private static final String driver="com.mysql.jdbc.Driver";
private static final String url="jdbc:mysql://localhost:3306/idea?characterEncoding=utf-8";
private static final String userName="root";
private static final String userPwd="123";

/**
* 获取数据库连接
* @return
*/
public static Connection getConnection(){
Connection conn=null;
try {
//加载驱动
Class.forName(driver);
//获取数据库连接
conn=DriverManager.getConnection(url, userName, userPwd);
} catch (Exception e) {
System.out.println("数据库连接异常");
e.printStackTrace();
}
return conn;
}
/**
* 使用PrepareStatement封装增删改操作
* @param sql
* @return
*/
public static boolean executeUpdate(String sql,Object[] objs){
Connection conn=null;
PreparedStatement pst=null;
boolean flag=false;
try {
conn=getConnection();
pst=conn.prepareStatement(sql);
//给参数赋值
for(int i=0;i<objs.length;i++){
pst.setObject(i+1, objs[i]);
}
int num=pst.executeUpdate();
if(num>0){
flag=true;
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeAll(conn, pst);
}

return flag;
}
/**
* 关闭连接对象
* @param conn
* @param state
* @param rs
*/
public static void closeAll(Connection conn,Statement state,ResultSet rs){
try {
if(rs!=null){
rs.close();
}
if(state!=null){
state.close();
}
if(conn!=null){
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
public static void closeAll(Connection conn,Statement state) {
try {
if (state != null) {
state.close();
}
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}

}