数据库基本操作框架（自用）

1、首先添加mysql-connector的jar包

2、配置基本的jdbc数据

package Jdbcnn;

public interface JdbcConfig {
	  String DRIVER = "com.mysql.jdbc.Driver";
	  String URL = "jdbc:mysql://localhost:3306/ceshi";
	  String USERNAME = "root";
	  String PASSWORD = "root";
}

3、设置连接方法

package Jdbcnn;

import java.sql.Connection;
import java.sql.DriverManager;

public class JdbcConn implements JdbcConfig {
    public Connection getConn(){
    	Connection conn = null;
    	try {
			Class.forName(DRIVER);
			conn = DriverManager.getConnection(URL,USERNAME, PASSWORD);
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    	return conn;
    }
}

4、增删查改基本方法

package Jdbcnn;
//要有jdbc的连接包
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class JdbcHelp implements JdbcConfig {
     JdbcConn conns = new JdbcConn();
	 private Connection conn = conns.getConn();
	 private PreparedStatement ps= null;
	 private ResultSet  rs= null;
	//向student表中插入一个同学
	public boolean insert(String sql) {
		// TODO Auto-generated method stub
		try {
			ps = conn.prepareStatement(sql);
            ps.setInt(1, 8);
            ps.setString(2,"A");
            ps.setString(3, "女");
		int a=	ps.executeUpdate();
		boolean flag =true;
		if(a!=1){
			flag=false;
		}
		return flag;
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return false;
	}
	//删除
	public void dele(String sql) {
		// TODO Auto-generated method stub
		try {
			ps=conn.prepareStatement(sql);
			/**
			 * 如果使用execute()删除成功也返回false
			 * 如果使用executeUpdate(),删除成功返回1 删除失败返回0
			 */
			int flag = ps.executeUpdate();
			System.out.println(flag);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
  //更新
	public int updata(String sql) {
		// TODO Auto-generated method stub
		try {
			ps=conn.prepareStatement(sql);
	    	int flag =ps.executeUpdate();
	    	System.out.println(flag);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return 0;
	}
    //查找方法事例
	public void search(String sql) {
		// TODO Auto-generated method stub
		try {
			ps=conn.prepareStatement(sql);
			rs=ps.executeQuery();
			while(rs.next()){
				String id = rs.getString(1);
				String name = rs.getString(2);
				String gender = rs.getString(3);
				System.out.println("id "+id+" name "+name+" gender "+gender);
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}
	//测试方法
public static void main(String[] args) {
	JdbcHelp jh = new JdbcHelp();
//执行插入	String sql="insert into student(id,NAME,gender) values(?,?,?);";
	//执行删除
//	String sql = "delete  from student where id =1;";
	//执行查找
//	String sql = "SELECT * from student";
	String sql = "UPDATE student SET id =3 where id= 2";
    jh.updata(sql);

}
}