常用的JDBC封装类DBHelper

常用的JDBC封装类DBHelper

package com.yang;

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

public class DBHelper {

Connection con=null;
public void conn(){

try {
Class.forName("com.mysql.jdbc.Driver");

String uri="jdbc:mysql://localhost/hello?characterEncoding=utf-8";
String user="root";
String password="123456";
con=DriverManager.getConnection(uri, user, password);

} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

public ResultSet getRS(String sql) throws SQLException
{
Statement s;
s = con.createStatement();
return s.executeQuery(sql);

}
public void DoInsert(String sql)
{
Statement s;
try {
s = con.createStatement();
s.executeUpdate(sql);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

public void close(){
try {
con.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

public static void main(String[] args)
{
DBHelper dh=new DBHelper();
dh.conn();

try {
ResultSet rs=dh.getRS("select * from tb_user");
while(rs.next()){
int id=rs.getInt("id");
String name=rs.getString("name");
System.out.println(id+name);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

dh.close();
System.out.println("OK");

}
}