當(dāng)前使用版本(必須填寫清楚，否則不予處理)

springboot版本:2.0.3.RELEASE

mybatis版本:3.0.5

jdk:1.8

該問(wèn)題是怎么引起的？(最新版上已修復(fù)的會(huì)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,"該賬號(hào)已經(jīng)答過(guò)題，請(qǐng)勿重復(fù)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+"，提交每日答題失敗，{}",e);

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

}

}

數(shù)據(jù)庫(kù)操作有兩次，第一次是查詢

List resultToday = resultEverydayService.findResultToday(openId);

第二次是新增

resultEverydayService.save(resultEveryday);

操作的是同一張表，先查詢是否已經(jīng)有，沒(méi)有的話進(jìn)行新增

重現(xiàn)步驟

當(dāng)并發(fā)的時(shí)候出現(xiàn)此類錯(cuò)誤

報(bào)錯(cuò)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

總結(jié)

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