package com.tt.mybatis.test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.Random;
public class InsertIntoDBData {
private static String url = "jdbc:mysql://localhost:3306/test?characterEncoding=utf-8";
private static String user = "root";
private static String password = "root";
public static void main(String[] args) {
Connection conn = null;
PreparedStatement ps = null;
long starTime = System.currentTimeMillis();
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url,user,password);
//String sql1 = "insert into course(c_id,name) values (?,?)";
//String sql2 = "insert into students(id,name) values (?,?)";
//s_id是students表id,只有7w个数据
//c_id是course表id,只有100个数据
String sql3 = "insert into sc(sc_id,s_id,c_id,score) values (?,?,?,?)";
ps = conn.prepareStatement(sql3);
Random rand = new Random();
for (int i = 1; i <= 700000; i++ ) {
ps.setInt(1,i);
ps.setInt(2,rand.nextInt(70000));
ps.setInt(3,rand.nextInt(100));
ps.setInt(4,rand.nextInt(100));
ps.addBatch();
}
ps.executeBatch();
long endTime = System.currentTimeMillis();
System.out.println("OK,用时:"+ (endTime - starTime) + "毫秒");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (ps != null ) {
try {
ps.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if (conn != null ) {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}
运行结果:竟然要44分钟
