What are the 5 steps to connect to the database using jdbc

The five steps for jdbc to connect to the database are: 1. Load the driver; 2. Connect to the database and determine whether the connection is successful; 3. Create a Statement object; 4. Execute the sql statement; 5. Print the results and close resources and databases.

The steps are as follows:

1. Load the driver; 2. Connect to the database and determine whether the connection is successful; 3. Create a Statement object; 4. , execute the sql statement; 5. Print the results, and close the resources and database.

(Video tutorial recommendation: java course)

Code implementation:

 1 import java.sql.Connection;
 2 import java.sql.DriverManager;
 3 import java.sql.ResultSet;
 4 import java.sql.SQLException;
 5 import java.sql.Statement;
 6 
 7 public class connectionMysql {
 8 
 9     public static void main(String[] args) {
10         
11         String driver="com.mysql.jdbc.Driver";//驱动路径
12         String url="jdbc:mysql://localhost:3306/eshop";//数据库地址
13         String user="root";//访问数据库的用户名
14         String password="123456";//用户密码        
15         try {
16             //1、加载驱动
17             Class.forName(driver);
18             //2、连接数据库
19             Connection con = DriverManager.getConnection(url, user, password);
20             if(!con.isClosed()){//判断数据库是否链接成功
21                 System.out.println("已成功链接数据库！");
22                 //3、创建Statement对象
23                 Statement st = con.createStatement();
24                 //4、执行sql语句
25                 String sql="select *from user";//查询user表的所有信息
26                 ResultSet rs = st.executeQuery(sql);//查询之后返回结果集
27                 //5、打印出结果
28                 while(rs.next()){
29                        System.out.println(rs.getString("Id")+"\t"+rs.getString("name")+"\t"+rs.getString("password"));
　　　　　　　　　　　}
               }
31                 rs.close();//关闭资源
32                 con.close();//关闭数据库
33             }
34                 
35             } catch (Exception e) {
36                 // TODO Auto-generated catch block
37                 e.printStackTrace();
38             }
39     }
40 }

Related recommendations: java entry

The above is the detailed content of What are the 5 steps to connect to the database using jdbc. For more information, please follow other related articles on the PHP Chinese website!