当前使用版本(必须填写清楚，否则不予处理)

springboot版本:2.0.3.RELEASE

mybatis版本:3.0.5

jdk:1.8

该问题是怎么引起的？(最新版上已修复的会直接close掉)

public Result getExamSetByExamId(@RequestParam("useTime")String useTime,

@RequestParam("openId")String openId,

@RequestParam("score")String score,

@RequestParam("isPass")Integer isPass,

@RequestParam("resultCount")Integer resultCount,

@RequestParam("answer")String answer){

try{

List resultToday = resultEverydayService.findResultToday(openId);

if(!resultToday.isEmpty()){

return ResultUtils.error(0001,"该账号已经答过题，请勿重复提交");

}

ResultEveryday resultEveryday = new ResultEveryday();

resultEveryday.setScore(Integer.valueOf(score)).setOpenId(openId).

setIsPass(isPass).setUseTime(useTime).setResultCount(resultCount);

resultEverydayService.save(resultEveryday);

resultDetailsEveryDay(resultEveryday.getResultId(),answer);

return ResultUtils.success(resultEveryday.getResultId());

}catch (Exception e){

log.error(openId+"，提交每日答题失败，{}",e);

return ResultUtils.error(0001,"提交失败");

}

}

数据库操作有两次，第一次是查询

List resultToday = resultEverydayService.findResultToday(openId);

第二次是新增

resultEverydayService.save(resultEveryday);

操作的是同一张表，先查询是否已经有，没有的话进行新增

重现步骤

当并发的时候出现此类错误

报错信息

Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction

The error may involve com.mybatis.plus.mp.mapper.ResultEverydayMapper.insert-Inline

The error occurred while setting parameters

SQL: INSERT INTO mp_result_everyday ( open_id, use_time, is_pass, score, result_count ) VALUES ( ?, ?, ?, ?, ? )

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction

; ]; Lock wait timeout exceeded; try restarting transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction