JDBC and MySQL databases

Catalog

One 、JDBC Connect MySQL

（ One ）Eclipse New projects

（ Two ） Import Mysql My bag  

Two 、 Establish database and query data

（ One ） newly build mysql database

 （ Two ）JDBC Connect MySQL Database and query data

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One 、JDBC Connect MySQL

Install first. MySQL and eclipse

（ One ）Eclipse New projects

1. open Eclipse

2. New projects

Click on File, And then click new Create a new one java project

 

 3. Project named

Build one called T1 Project

  Click on finish

4. Create success

（ Two ） Import Mysql My bag  

 1. Right click T1 choice Bulid Path --Add External Archiyes

 2. Import correspondence mysql Of jar package

 3. Successful import

Two 、 Establish database and query data

（ One ） newly build mysql database

1. open Navicat And create a new connection

  The connection name is T

2. Test link

  Then click OK

 3. New database

Right click Connect T New name is t database

 

  Click ok

Check whether the database is successful

 4. New query

 

 5. Create table

CREATE TABLE `websites` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` char(20) NOT NULL DEFAULT '' COMMENT ' Site name ',
  `url` varchar(255) NOT NULL DEFAULT '',
  `alexa` int(11) NOT NULL DEFAULT '0' COMMENT 'Alexa  ranking ',
  `country` char(10) NOT NULL DEFAULT '' COMMENT ' Country ',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;

And run

 6. Add data

INSERT INTO `websites` VALUES ('1', 'Google', 'https://www.google.cm/', '1', 'USA'), ('2', ' TaoBao ', 'https://www.taobao.com/', '13', 'CN'), ('3', ' Novice tutorial ', 'http://www.runoob.com', '5892', ''), ('4', ' Microblogging ', 'http://weibo.com/', '20', 'CN'), ('5', 'Facebook', 'https://www.facebook.com/', '3', 'USA');

7. View the data

 （ Two ）JDBC Connect MySQL Database and query data

 1. New package t

Right click src 

      

Click on finish

 2. The new class

Right click t Create a new class

           

3. Code

package t;

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

import com.mysql.jdbc.Statement;

public class MYSQLDemo {
	static final String driverName="org.gjt.mm.mysql.Driver";
	static final String dbUrl="jdbc:mysql://localhost:3306/t";
	static final String userName="root";
	static final String password="123456";
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		// MySQL 8.0  The following versions  - JDBC  Driver name and database  URL

	        Connection conn = null;
	        Statement stmt = null;
	        try{
	            //  register  JDBC  drive 
	            Class.forName(driverName);
	        
	            //  Open the link 
	            System.out.println(" Connect to database ...");
	            conn = DriverManager.getConnection(dbUrl,userName,password);
	        
	            //  Execute the query 
	            System.out.println("  Instantiation Statement object ...");
	            stmt = (Statement) conn.createStatement();
	            String sql;
	            sql = "SELECT id, name, url FROM websites";
	            ResultSet rs = stmt.executeQuery(sql);
	        
	            //  Expand the result set database 
	            while(rs.next()){
	                //  Retrieve... By fields 
	                int id  = rs.getInt("id");
	                String name = rs.getString("name");
	                String url = rs.getString("url");
	    
	                //  Output data 
	                System.out.print("ID: " + id);
	                System.out.print(",  Site name : " + name);
	                System.out.print(",  Site  URL: " + url);
	                System.out.print("\n");
	            }
	            //  Close... When done 
	            rs.close();
	            stmt.close();
	            conn.close();
	        }catch(SQLException se){
	            //  Handle  JDBC  error 
	            se.printStackTrace();
	        }catch(Exception e){
	            //  Handle  Class.forName  error 
	            e.printStackTrace();
	        }finally{
	            //  close resource 
	            try{
	                if(stmt!=null) stmt.close();
	            }catch(SQLException se2){
	            }//  Don't do anything? 
	            try{
	                if(conn!=null) conn.close();
	            }catch(SQLException se){
	                se.printStackTrace();
	            }
	        }
	        System.out.println("Goodbye!");
	    }
	}

 4. Execute the code and display the results

reference ：Java MySQL Connect | Novice tutorial

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