利用spring boot 构建了200w的数据记录
package com.example.demo.init;
import com.example.demo.dao.StudentDao;
import com.example.demo.model.StudentEbo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import java.util.ArrayList;
import java.util.List;
/**
* @author duanxiaoqiu
* @Date 2019-06-17 20:12
**/
@Slf4j
@Order(value = 0)
@Component
public class initData implements CommandLineRunner {
@Autowired
private StudentDao studentDao;
@Override
public void run(String... args) throws Exception {
log.info("=======init=======");
long start = System.currentTimeMillis();
List<StudentEbo> studentEbos = new ArrayList<>();
int num = 0;
for (int i = 0; i < 2000000; i++) {
StudentEbo studentEbo = new StudentEbo();
studentEbo.setName("xq" + i);
studentEbo.setColor("color" + i);
studentEbo.setSize("size" + i);
studentEbos.add(studentEbo);
num++;
if (num == 10000) {
log.info("=======");
long time=System.currentTimeMillis();
studentDao.insertByBatch(studentEbos);
log.info("==time:{}===",System.currentTimeMillis()-time);
studentEbos.clear();
num = 0;
}
}
if (studentEbos != null && studentEbos.size() > 0) {
studentDao.insertByBatch(studentEbos);
}
log.info("======cost:{}======", System.currentTimeMillis() - start);
}
}
select * from t_student WHERE size='size10001'
耗时:0.747s
1.新增索引
ALTER TABLE `t_student` ADD INDEX `index1` (`size`) USING BTREE ;
查询耗时:0.248s
多列索引和联合索引参考: