Mysql数据库连接类

package edu.qdgxy.jdbc;

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

public class MySQLConnBean {
private Statement stmt = null;
private Connection conn = null;
ResultSet rs = null;
//构造函数
public MySQLConnBean(){}
public void OpenConn()throws Exception
{
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
String url = "jdbc:mysql://localhost:3306/test";
String user = "root";
String password = "admin";
conn = DriverManager.getConnection(url,user,password);
}
catch(SQLException e)
{
System.err.println("Data.executeQuery: " + e.getMessage());
}
}
//执行查询类的SQL语句，有返回集
public ResultSet executeQuery(String sql)
{
rs = null;
try
{
stmt = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
rs = stmt.executeQuery(sql);
}
catch(SQLException e)
{
System.err.println("Data.executeQuery: " + e.getMessage());
}
return rs;
}
//关闭对象
public void closeStmt()
{
try
{
stmt.close();
}
catch(SQLException e)
{
System.err.println("Date.executeQuery: " + e.getMessage());
}
}
public void closeConn()
{
try
{
conn.close();
}
catch(SQLException e)
{
System.err.println("Data.executeQuery: " + e.getMessage());
}
}
}