Detailed steps of JDBC connection to database

One 、 Create a project first
Two 、 Open the database and start the connection


（ I was in IDEA Written in , Guide package in advance ）
3、 ... and 、 No, the guide bag is Maven Midcourse , stay pom.xml Medium dependencise discharge , The version number depends on whether you want a higher version or a lower version . Put it in and then refresh and reload it to maven Rely on yourself .

   <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>

Detailed code ：

package com.example.dem02;	// Project package name 

import java.sql.*;

public class jdbcText01 {
    public static void main(String[] args){
        Connection conn = null;
        Statement stmt = null;
        try{
            //1、 Registration drive 
            DriverManager.registerDriver(new com.mysql.jdbc.Driver());
            //Class.forName("com.mysql.jdbc.Driver");
            //2、 Get the connection 
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/student","root","root");
            //3、 Get database operation object 
            stmt = conn.createStatement();
            //4、 perform sql sentence 
            String sql = "INSERT INTO class(Sid,Sname,Sage,Sgrade)VALUES ('003',' indigo plant ','19','89')";
            int count = stmt.executeUpdate(sql);
            System.out.println(count == 1 ? " The update is successful ": " Update failed ");
            //5、 Process the project result set 
            
        }catch (SQLException  e){
            e.printStackTrace();
        }finally {
            //6、 Release resources 
            if (stmt != null){
                try{
                    stmt.close();
                }catch(SQLException e ){
                    e.printStackTrace();
                }
            }
            if(conn != null){
                try{
                    conn.close();
                }catch(SQLException e){
                    e.printStackTrace();
                }
            }
        }
    }
}