用于MySQL查询的备用Mongo DB查询

时间:2017-05-05 16:27:24

标签: mysql mongodb

作为从MySQL迁移到MongoDB的一部分,我试图将所有mySQL查询重写为MongoDB查询。除了查询之外,我能够成功地做同样的事情

MySQL查询:

SELECT(select job_status from indexjob order by job_timestamp desc limit 1) AS job_status,(select job_timestamp from indexjob where job_status='SUCCESS' order by job_timestamp desc limit 1) AS job_timestamp;

MongoDB数据结构:

/* 1 */
{
    "_id" : ObjectId("590caba811ef2308585f0dbb"),
    "_class" : "com.info.sample.bean.IndexJobBean",
    "jobName" : "IndexJob",
    "jobStatus" : "SUCCESS",
    "timeStamp" : "2017.05.05.22.13.19"
}

/* 2 */
{
    "_id" : ObjectId("590caf1711ef23082cc58a3b"),
    "_class" : "com.info.sample.bean.IndexJobBean",
    "jobName" : "IndexJob",
    "jobStatus" : "FAILED",
    "timeStamp" : "2017.05.05.22.27.59"
}

编辑 - 来自评论 查询应返回上一个jobStatus =" SUCCESS"的时间戳。和最后一个jobStatus(可以是SUCCESS或FAILED)。在MySQL中,我以这种方式获取这些结果,结果将是一行,其中包含jobStatus列和具有相应值的timestamp。

0 个答案:

没有答案