缓存击穿
也叫做热点key问题，就是一个高并发访问并且重建业务较为复杂的key突然失效，无数的请求访问会在瞬间给数据库带来巨大的压力
解决策略
| 解决方案 | 优点 | 缺点 |
|---|---|---|
| 互斥锁 | 没有额外的内存消耗 保证数据一致性 实现简单 | 线程需要等待，性能受到影响 可能有死锁的风险 |
| 逻辑过期 | 线程无需等待，性能较好 | 不保证一致性 有额外的内存消耗 实现复杂 |
下面以访问用户分页信息为例，分别加上采取互斥锁和逻辑过期策略
互斥锁
代码逻辑
同一时刻只允许一个线程查询数据库，请求成功后将数据存入redis
其余线程则一直等待，直到缓存中存在数据
PS: 可以利用redis的setnx方法（只能在第一次成功设置值，以后设置将会失败），模拟锁的获取
ini
// 互斥锁解决缓存击穿
public Result queryWithMutex(int page, int pageSize, String name){
String mykey = EMPLOYEE_PAGE_PREFIX + "page" + page + "_" + "pageSize" + pageSize + "_" + "name"+ name;
Page<Employee> pageList = null;
//从缓存中查询是否存在
Object o = redisUtils.get(mykey);
//缓存中没有page信息
if(o==null){
String lockKey = EMPLOYEE_LOCK_PREFIX+ "page"+ page + "_" + "pageSize" + pageSize + "_" + "name"+ name;
try {
// 1.获取互斥锁
boolean b = tryLock(lockKey);
int count = 1;
// 2. 判断是否读取成功
while(!b){
// 3. 失败，则休眠重试
Thread.sleep(100);
log.info("已经有线程占有锁，休眠后再次查询,这是第{}次休眠",count++);
b = tryLock(lockKey);
if(b){
o = redisUtils.get(mykey);
log.info("休眠后发现缓存有值了，请求到redis");
pageList = JSON.parseObject(o.toString(), Page.class);
unlock(lockKey);
return Result.success(pageList);
}
}
log.info("我是第{}个进入线程,直接查询数据库",number++);
pageList = queryPageAndSave(page,pageSize,name,mykey);
}catch(InterruptedException e){
throw new RuntimeException();
}finally{
// 释放互斥锁
unlock(lockKey);
}
}
else{
log.info("直接请求redis的");
pageList = JSON.parseObject(o.toString(), Page.class);
}
return Result.success(pageList);
}情景模拟
此时redis没有缓存，将会有100个线程在1S内同时访问，下图为部分控制台输出
只有一个线程能够访问数据库，其余线程均会休眠。可以根据任务完成的速度，设置线程的休眠时间。
逻辑过期
代码逻辑
保存时候额外添加带有逻辑过期时间的字段，使用了逻辑过期替代TTL。这样redis中永远都有值，虽然这会导致用户访问到旧的数据。
ini
// 保存带有逻辑过期时间的字段
public Page saveEmployeeWithLogicExpire(int page, int pageSize, String name,Long expireSeconds) {
log.info("开始查询数据库信息");
// 查询店铺信息
Page queryPage = queryPage(page, pageSize, name);
// 封装逻辑过期时间
RedisData data = new RedisData();
data.setData(queryPage);
data.setExpireTime(LocalDateTime.now().plusSeconds(expireSeconds));
//写入到redis缓存
String key = EMPLOYEE_PAGE_PREFIX + "page" + page + "_" + "pageSize" + pageSize + "_" + "name"+ name;
String value =JSON.toJSONString(data);
redisUtils.set(key,value);
return queryPage;
}下面代码的逻辑是：当缓存中不存在所求信息，或者逻辑过期时间已到，需要去数据库查询数据更新到redis中。此时，第一个进入方法的线程负责查询更新操作，其余线程会从已有的redis缓存中取出。若缓存中没有，即高并发且第一次访问时候，还会产生缓存击穿问题。
ini
//线程池
private static final ExecutorService CACHE_REBUILD_EXECUTOR = Executors.newFixedThreadPool(10);
// 逻辑过期解决缓存击穿
public Result queryWithLoginExpire(int page, int pageSize, String name){
String mykey = EMPLOYEE_PAGE_PREFIX + "page" + page + "_" + "pageSize" + pageSize + "_" + "name"+ name;
Page<Employee> pageList = null;
//从缓存中查询是否存在
Object o = redisUtils.get(mykey);
// 缓存中存在
if(o!=null ){
//命中，先把json反序列化为对象
RedisData redisData = JSON.parseObject(o.toString(), RedisData.class);
// 获取分页和逻辑过期时间
Page page1 = JSON.parseObject(redisData.getData().toString(), Page.class);
LocalDateTime expireTime = redisData.getExpireTime();
// 判断是否过期
if(expireTime.isAfter(LocalDateTime.now())){
log.info("逻辑时间还没到，直接从redis中返回员工信息");
//未过期，直接返回员工信息
return Result.success(page1);
}
// 已过期，需要缓存重建
String key = EMPLOYEE_LOCK_PREFIX + "page" + page + "_" + "pageSize" + pageSize + "_" + "name"+ name;
boolean b = tryLock(key);
// 更新缓存信息
if(b) {
CACHE_REBUILD_EXECUTOR.submit(()->{
log.info("逻辑时间已过，更新员工信息");
// 重建缓存
Page page2 = this.saveEmployeeWithLogicExpire(page, pageSize, name,EMPLOYEE_LOCK_EXPIRE);
// 释放锁
unlock(key);
return Result.success(page2);
});
}
// 其余线程返回旧的信息
log.info("已经有线程在更新，返回旧的数据");
return Result.success(page1);
}
else {
//缓存中不存在，查询数据库并且存入缓存
log.info("redis中不存在,查询数据库信息");
Page page1 = saveEmployeeWithLogicExpire(page, pageSize, name, EMPLOYEE_LOCK_EXPIRE);
return Result.success(page1);
}
}情景模拟
初始状态
此时redis缓存为空，有100个线程在1秒内访问分页内容
以下展示部分控制台信息，初始化高并发访问仍会出现缓存击穿
yaml
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@7f3757c3] was not registered for synchronization because synchronization is not active
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1b925a02] was not registered for synchronization because synchronization is not active
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@53bc6b0b] was not registered for synchronization because synchronization is not active
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1602ed6a] was not registered for synchronization because synchronization is not active
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@24f7d7f2] was not registered for synchronization because synchronization is not active
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@3364860a] was not registered for synchronization because synchronization is not active
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@457a807f] was not registered for synchronization because synchronization is not active
2023-06-08 00:28:12.161 INFO 52980 --- [io-8081-exec-43] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2023-06-08 00:28:12.655 INFO 52980 --- [io-8081-exec-43] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
JDBC Connection [HikariProxyConnection@2106806061 wrapping com.mysql.cj.jdbc.ConnectionImpl@7e216c0] will not be managed by Spring
JDBC Connection [HikariProxyConnection@1338578974 wrapping com.mysql.cj.jdbc.ConnectionImpl@727d514d] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Preparing: SELECT COUNT(*) AS total FROM employee
JDBC Connection [HikariProxyConnection@461634391 wrapping com.mysql.cj.jdbc.ConnectionImpl@145b03f7] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
==> Parameters:
==> Parameters:
JDBC Connection [HikariProxyConnection@1007102482 wrapping com.mysql.cj.jdbc.ConnectionImpl@109dd549] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
JDBC Connection [HikariProxyConnection@411223316 wrapping com.mysql.cj.jdbc.ConnectionImpl@527d23ab] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
JDBC Connection [HikariProxyConnection@639844861 wrapping com.mysql.cj.jdbc.ConnectionImpl@9928553] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
JDBC Connection [HikariProxyConnection@240348441 wrapping com.mysql.cj.jdbc.ConnectionImpl@3e0ff29f] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
JDBC Connection [HikariProxyConnection@377573666 wrapping com.mysql.cj.jdbc.ConnectionImpl@68286884] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
<== Columns: total
<== Row: 6
<== Total: 1
<== Columns: total
==> Preparing: SELECT id,name,username,password,phone,sex,id_number,status,create_time,update_time,create_user,update_user FROM employee ORDER BY update_time DESC LIMIT ?
<== Row: 6
<== Total: 1
==> Preparing: SELECT id,name,username,password,phone,sex,id_number,status,create_time,update_time,create_user,update_user FROM employee ORDER BY update_time DESC LIMIT ?
==> Parameters: 2(Long)
==> Parameters: 2(Long)
<== Columns: id, name, username, password, phone, sex, id_number, status, create_time, update_time, create_user, update_user
<== Row: 1663073285396586498, 8888555, 1234, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 333333333333333333, 1, 2023-05-29 14:42:24, 2023-06-07 23:14:03, 1, 1
<== Row: 1664913382693785601, zhsss, zhangsan, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 340820200010020131, 1, 2023-06-03 16:34:18, 2023-06-03 16:34:18, 1, 1
<== Total: 2
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@5f58ffac]
JDBC Connection [HikariProxyConnection@979270653 wrapping com.mysql.cj.jdbc.ConnectionImpl@3e0ff29f] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
<== Columns: total
<== Row: 6
<== Total: 1
==> Preparing: SELECT id,name,username,password,phone,sex,id_number,status,create_time,update_time,create_user,update_user FROM employee ORDER BY update_time DESC LIMIT ?
==> Parameters: 2(Long)
<== Columns: id, name, username, password, phone, sex, id_number, status, create_time, update_time, create_user, update_user
<== Row: 1663073285396586498, 8888555, 1234, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 333333333333333333, 1, 2023-05-29 14:42:24, 2023-06-07 23:14:03, 1, 1
<== Row: 1664913382693785601, zhsss, zhangsan, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 340820200010020131, 1, 2023-06-03 16:34:18, 2023-06-03 16:34:18, 1, 1
<== Total: 2
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@7ea15164]
JDBC Connection [HikariProxyConnection@1742701579 wrapping com.mysql.cj.jdbc.ConnectionImpl@3e0ff29f] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
<== Columns: total
<== Row: 6
<== Total: 1
==> Preparing: SELECT id,name,username,password,phone,sex,id_number,status,create_time,update_time,create_user,update_user FROM employee ORDER BY update_time DESC LIMIT ?
==> Parameters: 2(Long)
<== Columns: id, name, username, password, phone, sex, id_number, status, create_time, update_time, create_user, update_user
<== Row: 1663073285396586498, 8888555, 1234, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 333333333333333333, 1, 2023-05-29 14:42:24, 2023-06-07 23:14:03, 1, 1
<== Row: 1664913382693785601, zhsss, zhangsan, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 340820200010020131, 1, 2023-06-03 16:34:18, 2023-06-03 16:34:18, 1, 1
<== Total: 2
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@68563e11]
JDBC Connection [HikariProxyConnection@1933071623 wrapping com.mysql.cj.jdbc.ConnectionImpl@3e0ff29f] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
<== Columns: total
<== Row: 6
<== Total: 1
==> Preparing: SELECT id,name,username,password,phone,sex,id_number,status,create_time,update_time,create_user,update_user FROM employee ORDER BY update_time DESC LIMIT ?
==> Parameters: 2(Long)
<== Columns: id, name, username, password, phone, sex, id_number, status, create_time, update_time, create_user, update_user
<== Row: 1663073285396586498, 8888555, 1234, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 333333333333333333, 1, 2023-05-29 14:42:24, 2023-06-07 23:14:03, 1, 1
<== Row: 1664913382693785601, zhsss, zhangsan, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 340820200010020131, 1, 2023-06-03 16:34:18, 2023-06-03 16:34:18, 1, 1
<== Total: 2
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1b925a02]
JDBC Connection [HikariProxyConnection@782494353 wrapping com.mysql.cj.jdbc.ConnectionImpl@3e0ff29f] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
<== Columns: total
<== Row: 6
<== Total: 1
==> Preparing: SELECT id,name,username,password,phone,sex,id_number,status,create_time,update_time,create_user,update_user FROM employee ORDER BY update_time DESC LIMIT ?
==> Parameters: 2(Long)
<== Columns: id, name, username, password, phone, sex, id_number, status, create_time, update_time, create_user, update_user
<== Row: 1663073285396586498, 8888555, 1234, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 333333333333333333, 1, 2023-05-29 14:42:24, 2023-06-07 23:14:03, 1, 1
<== Row: 1664913382693785601, zhsss, zhangsan, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 340820200010020131, 1, 2023-06-03 16:34:18, 2023-06-03 16:34:18, 1, 1
<== Total: 2
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@24f7d7f2]
JDBC Connection [HikariProxyConnection@583545093 wrapping com.mysql.cj.jdbc.ConnectionImpl@3e0ff29f] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
<== Columns: id, name, username, password, phone, sex, id_number, status, create_time, update_time, create_user, update_user
<== Row: 1663073285396586498, 8888555, 1234, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 333333333333333333, 1, 2023-05-29 14:42:24, 2023-06-07 23:14:03, 1, 1
<== Row: 1664913382693785601, zhsss, zhangsan, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 340820200010020131, 1, 2023-06-03 16:34:18, 2023-06-03 16:34:18, 1, 1
<== Total: 2
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2f824173]
JDBC Connection [HikariProxyConnection@2051368544 wrapping com.mysql.cj.jdbc.ConnectionImpl@727d514d] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
<== Columns: total
<== Row: 6
<== Total: 1
==> Preparing: SELECT id,name,username,password,phone,sex,id_number,status,create_time,update_time,create_user,update_user FROM employee ORDER BY update_time DESC LIMIT ?
==> Parameters: 2(Long)
<== Columns: id, name, username, password, phone, sex, id_number, status, create_time, update_time, create_user, update_user
<== Columns: total
<== Row: 6
<== Total: 1
<== Row: 1663073285396586498, 8888555, 1234, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 333333333333333333, 1, 2023-05-29 14:42:24, 2023-06-07 23:14:03, 1, 1
<== Row: 1664913382693785601, zhsss, zhangsan, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 340820200010020131, 1, 2023-06-03 16:34:18, 2023-06-03 16:34:18, 1, 1
==> Preparing: SELECT id,name,username,password,phone,sex,id_number,status,create_time,update_time,create_user,update_user FROM employee ORDER BY update_time DESC LIMIT ?
==> Parameters: 2(Long)
<== Total: 2
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@180b57fa]
JDBC Connection [HikariProxyConnection@1143773205 wrapping com.mysql.cj.jdbc.ConnectionImpl@3e0ff29f] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
<== Columns: id, name, username, password, phone, sex, id_number, status, create_time, update_time, create_user, update_user
<== Row: 1663073285396586498, 8888555, 1234, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 333333333333333333, 1, 2023-05-29 14:42:24, 2023-06-07 23:14:03, 1, 1
<== Columns: total
<== Row: 6
<== Total: 1
<== Row: 1664913382693785601, zhsss, zhangsan, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 340820200010020131, 1, 2023-06-03 16:34:18, 2023-06-03 16:34:18, 1, 1
==> Preparing: SELECT id,name,username,password,phone,sex,id_number,status,create_time,update_time,create_user,update_user FROM employee ORDER BY update_time DESC LIMIT ?
==> Parameters: 2(Long)
<== Total: 2
<== Columns: id, name, username, password, phone, sex, id_number, status, create_time, update_time, create_user, update_user
<== Row: 1663073285396586498, 8888555, 1234, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 333333333333333333, 1, 2023-05-29 14:42:24, 2023-06-07 23:14:03, 1, 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@622a7c88]
JDBC Connection [HikariProxyConnection@1758121299 wrapping com.mysql.cj.jdbc.ConnectionImpl@7e216c0] will not be managed by Spring
==> Preparing: SELECT COUNT(*) AS total FROM employee
==> Parameters:
<== Row: 1664913382693785601, zhsss, zhangsan, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 340820200010020131, 1, 2023-06-03 16:34:18, 2023-06-03 16:34:18, 1, 1
<== Columns: total
<== Row: 6
<== Total: 2
<== Total: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@45b64fe]逻辑时间未过
此时逻辑时间未过，无需查询数据库，从redis缓存中获取即可
yaml
2023-06-08 00:34:18.566 INFO 55516 --- [io-8081-exec-11] o.s.web.servlet.DispatcherServlet : Completed initialization in 16 ms
2023-06-08 00:34:22.828 INFO 55516 --- [io-8081-exec-37] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.828 INFO 55516 --- [io-8081-exec-87] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.828 INFO 55516 --- [io-8081-exec-99] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.828 INFO 55516 --- [io-8081-exec-12] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.828 INFO 55516 --- [io-8081-exec-71] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.828 INFO 55516 --- [io-8081-exec-89] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.828 INFO 55516 --- [io-8081-exec-35] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.828 INFO 55516 --- [io-8081-exec-80] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.828 INFO 55516 --- [nio-8081-exec-9] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.828 INFO 55516 --- [io-8081-exec-66] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.828 INFO 55516 --- [io-8081-exec-60] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [io-8081-exec-53] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [io-8081-exec-14] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [io-8081-exec-44] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [io-8081-exec-27] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [io-8081-exec-41] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [nio-8081-exec-6] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [io-8081-exec-78] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [io-8081-exec-10] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [io-8081-exec-34] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [io-8081-exec-22] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息
2023-06-08 00:34:22.859 INFO 55516 --- [io-8081-exec-50] c.e.d.service.impl.EmployeeServiceImpl : 逻辑时间还没到，直接从redis中返回员工信息逻辑时间已过
此时逻辑时间已过，需要去数据库重新查询信息，此次更新只查询了一次数据库
yaml
2023-06-08 00:39:14.097 INFO 55516 --- [o-8081-exec-113] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.096 INFO 55516 --- [io-8081-exec-75] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.097 INFO 55516 --- [o-8081-exec-101] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.097 INFO 55516 --- [o-8081-exec-102] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.096 INFO 55516 --- [o-8081-exec-111] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：true
2023-06-08 00:39:14.096 INFO 55516 --- [io-8081-exec-22] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.097 INFO 55516 --- [io-8081-exec-64] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.097 INFO 55516 --- [io-8081-exec-35] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.097 INFO 55516 --- [o-8081-exec-110] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.101 INFO 55516 --- [o-8081-exec-120] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.106 INFO 55516 --- [o-8081-exec-101] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.106 INFO 55516 --- [o-8081-exec-110]
2023-06-08 00:39:14.325 INFO 55516 --- [o-8081-exec-116] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.326 INFO 55516 --- [o-8081-exec-116] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.326 INFO 55516 --- [o-8081-exec-103] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.326 INFO 55516 --- [o-8081-exec-103] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.335 INFO 55516 --- [o-8081-exec-119] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.335 INFO 55516 --- [o-8081-exec-119] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.337 INFO 55516 --- [o-8081-exec-115] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.337 INFO 55516 --- [o-8081-exec-115] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.345 INFO 55516 --- [o-8081-exec-117] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.345 INFO 55516 --- [o-8081-exec-117] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.347 INFO 55516 --- [o-8081-exec-107] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.347 INFO 55516 --- [o-8081-exec-107] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.356 INFO 55516 --- [o-8081-exec-109] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.356 INFO 55516 --- [o-8081-exec-109] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.357 INFO 55516 --- [o-8081-exec-105] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.357 INFO 55516 --- [o-8081-exec-105] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.368 INFO 55516 --- [o-8081-exec-121] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.368 INFO 55516 --- [o-8081-exec-121] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.369 INFO 55516 --- [io-8081-exec-22] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.369 INFO 55516 --- [io-8081-exec-22] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.375 INFO 55516 --- [o-8081-exec-102] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.375 INFO 55516 --- [o-8081-exec-102]
2023-06-08 00:39:14.454 INFO 55516 --- [o-8081-exec-101] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.454 INFO 55516 --- [o-8081-exec-101] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.468 INFO 55516 --- [o-8081-exec-110] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.468 INFO 55516 --- [o-8081-exec-110] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.477 INFO 55516 --- [o-8081-exec-120] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.478 INFO 55516 --- [o-8081-exec-120] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.487 INFO 55516 --- [io-8081-exec-35] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.487 INFO 55516 --- [io-8081-exec-35] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.497 INFO 55516 --- [io-8081-exec-99] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.497 INFO 55516 --- [io-8081-exec-99] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.500 INFO 55516 --- [pool-2-thread-1] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2023-06-08 00:39:14.507 INFO 55516 --- [io-8081-exec-75] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.507 INFO 55516 --- [io-8081-exec-75] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.519 INFO 55516 --- [nio-8081-exec-1] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.519 INFO 55516 --- [o-8081-exec-108] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.519 INFO 55516 --- [nio-8081-exec-1] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.519 INFO 55516 --- [o-8081-exec-108] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.527 INFO 55516 --- [io-8081-exec-46] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.528 INFO 55516 --- [io-8081-exec-46] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:14.537 INFO 55516 --- [o-8081-exec-113] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:14.537 INFO 55516 --- [o-8081-exec-113] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:15.273 INFO 55516 --- [o-8081-exec-110] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
==> Parameters:
2023-06-08 00:39:15.461 INFO 55516 --- [o-8081-exec-108] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.461 INFO 55516 --- [o-8081-exec-120] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.461 INFO 55516 --- [o-8081-exec-108] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:15.461 INFO 55516 --- [o-8081-exec-120] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-75] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-75] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-99] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-35] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-99] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
==> Preparing: SELECT COUNT(*) AS total FROM employee
2023-06-08 00:39:15.273 INFO 55516 --- [o-8081-exec-110] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.273 INFO 55516 --- [o-8081-exec-110] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
==> Parameters:
2023-06-08 00:39:15.461 INFO 55516 --- [o-8081-exec-108] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.461 INFO 55516 --- [o-8081-exec-120] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.461 INFO 55516 --- [o-8081-exec-108] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:15.461 INFO 55516 --- [o-8081-exec-120] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-75] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-75] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-99] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-35] c.e.d.service.impl.EmployeeServiceImpl : 此次请求的结果为：false
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-99] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
2023-06-08 00:39:15.461 INFO 55516 --- [io-8081-exec-35] c.e.d.service.impl.EmployeeServiceImpl : 已经有线程在更新，返回旧的数据
<== Columns: total
<== Row: 6
<== Total: 1
==> Preparing: SELECT id,name,username,password,phone,sex,id_number,status,create_time,update_time,create_user,update_user FROM employee ORDER BY update_time DESC LIMIT ?
==> Parameters: 2(Long)
<== Columns: id, name, username, password, phone, sex, id_number, status, create_time, update_time, create_user, update_user
<== Row: 1663073285396586498, 8888555, 1234, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 333333333333333333, 1, 2023-05-29 14:42:24, 2023-06-07 23:14:03, 1, 1
<== Row: 1664913382693785601, zhsss, zhangsan, e10adc3949ba59abbe56e057f20f883e, 13365698890, 0, 340820200010020131, 1, 2023-06-03 16:34:18, 2023-06-03 16:34:18, 1, 1
<== Total: 2