Teach you how to insert 1 million records into MySQL in 6 seconds

package test0823.demo1;

import java.sql.*;

/**
 * @author : Bei-Zhen
 * @date : 2020-08-24 0:43
 */
public class JDBC2 {

  //static int count = 0;

  public static void main(String[] args) {

    long start = System.currentTimeMillis();
    conn();
    long end = System.currentTimeMillis();
    System.out.println("Time taken: " + (end - start)/1000 + "seconds");
  }

  public static void conn(){
    //1. Import the driver jar package //2. Register the driver (the driver jar package after mysql5 can omit the driver registration step)
    //Class.forName("com.mysql.jdbc.Driver");
    //3. Get the database connection object Connection conn = null;
    PreparedStatement pstmt = null;
    {
      try {
        //"&rewriteBatchedStatements=true", insert multiple data at a time, insert only onceconn = DriverManager.getConnection("jdbc:mysql:///test?" + "&rewriteBatchedStatements=true","root","root");
        //4. Define sql statement String sql = "insert into user values(default,?,?)";
        //5. Get the PreparedStatement object that executes SQL
        pstmt = conn.prepareStatement(sql);
        //6. Continuously generate sql
        for (int i = 0; i < 1000000; i++) {
          pstmt.setString(1,(int)(Math.random()*1000000)+"");
          pstmt.setString(2,(int)(Math.random()*1000000)+"");
          pstmt.addBatch();
        }
        //7. Insert data into the database once pstmt.executeBatch();
        System.out.println("1,000,000 pieces of information were added successfully!");

      } catch (SQLException e) {
        e.printStackTrace();
      finally
        //8. Release resources //Avoid null pointer exception if (pstmt != null) {
          try {
            pstmt.close();
          } catch (SQLException e) {
            e.printStackTrace();
          }
        }

        if(conn != null) {
          try {
            conn.close();
          } catch (SQLException e) {
            e.printStackTrace();
          }
        }
      }
    }

  }

}