MyEclipse与Mysql数据库的连接

Posted 2020-06-29 Brenda

1.载入mysql驱动程序

Class.forName("com.mysql.jdbc.Driver");    // 载入MySql驱动程序

2.建立Connection连接对象

con=DriverManager.getConnection("jdbc:mysql://localhost:3306/my_db?user=root&password=root");

当中

url = "jdbc:mysql://localhost/";

serverName = "localhost";

portNumber = "3306";

databaseName = "my_db";

userName = "root";

password = "root";

3.建立Statement语句对象

Statement st = con.createment();

4.运行sql语句

st.executeUpdate(“SQL语句”);//插入

st.executeUpdate(“SQL语句”);//更新

st.executeexecuteQuery(“SQL语句”);//查询

5.关闭连接

con.close();

6.实现案例

DBConn.java中是对连接数据库的实现

package db;

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

public class DBConn {
	
	/* 获取Conncetion对象并返回 */
	
	public Connection getConnection() {
		
		Connection con=null;
		
        try {
        		Class.forName("com.mysql.jdbc.Driver");    // 载入MySql驱动程序
        		//con = DriverManager.getConnection("jdbc:mysql://localhost/cloud_db?
user=root&password=root&autoReconnect=true&useUnicode=true&characterEncoding=utf8"); 
            	con=DriverManager.getConnection("jdbc:mysql://localhost:3306/my_db?user=root&password=root&useUnicode=true&characterEncoding=GBK");
            	//jdbc:mysql://localhost/数据库名称?useUnicode=true&characterEncoding=GBK
            	
        } catch (Exception e) {
        	System.out.println("数据库获取失败！
");
        	e.printStackTrace();
            
        }
        
        return con;
        
	}
}

StudentImpl.java是对数据库数据的录入

package impl;
import pojo.Student;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import db.DBConn;
public class StudentImpl {
	public String joinString(String[] slikes) {
		String joinlikes = "";
		for (String temp : slikes) {
			joinlikes += temp + "-";
		}
		return joinlikes.substring(0, joinlikes.length() - 1);
	}

	public void saveStudent(Student student){
		//连接数据库完毕数据的录入操作
		Connection con = null;
		PreparedStatement pre = null;
		DBConn conns = new DBConn();
		con = conns.getConnection();
		try{
		pre = con.prepareStatement("insert into student (sname,spass,Slikes) values(?
,?,?)");
		pre.setString(1,student.getSname());
		pre.setString(2,student.getSpass());
		pre.setString(3,student.getSlikes());
		boolean b = pre.execute();
		}catch(SQLException e){
			e.printStackTrace();
		}finally{
			try {
				con.close();
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		
		
	}
}