startTime.isBefore(currentRangeStart) ? currentRangeStart : startTime在java中这个代码是什么意思
时间: 2024-04-11 10:30:31 浏览: 94
这段代码是一个条件表达式,用于比较时间的先后顺序。在这里,`startTime` 和 `currentRangeStart` 是两个时间对象。
`startTime.isBefore(currentRangeStart)` 是一个判断语句,用于检查 `startTime` 是否在 `currentRangeStart` 之前。如果条件成立,则返回 `currentRangeStart`;否则返回 `startTime`。
简而言之,这段代码的意思是,如果 `startTime` 在 `currentRangeStart` 之前,返回 `currentRangeStart`;否则返回 `startTime`。
相关问题
List<TVehcertUploadLog> list = tVehcertUploadLogService.list(new LambdaQueryWrapper<TVehcertUploadLog>().eq(StringUtils.isNotBlank(tVehcertUploadLog.getVin()),TVehcertUploadLog::getVin,tVehcertUploadLog.getVin()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getVehWzhgzbh()),TVehcertUploadLog::getVehWzhgzbh,tVehcertUploadLog.getVehWzhgzbh()) .like(StringUtils.isNotBlank(tVehcertUploadLog.getBz()),TVehcertUploadLog::getBz,tVehcertUploadLog.getBz()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsValid()),TVehcertUploadLog::getIsValid,tVehcertUploadLog.getIsValid()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsSample()),TVehcertUploadLog::getIsSample,tVehcertUploadLog.getIsSample()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getCreateBy()),TVehcertUploadLog::getCreateBy,tVehcertUploadLog.getCreateBy()) .ge(tVehcertUploadLog.getParams().containsKey("startTime")&&StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString()), TVehcertUploadLog::getUpDate,tVehcertUploadLog.getParams().containsKey("startTime")&&StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString())?sdf.parse(tVehcertUploadLog.getParams().get("startTime").toString()):"") .le(tVehcertUploadLog.getParams().containsKey("endTime")&&StringUtils.isNotEmpty(tVehcertUploadLog .getParams().get("endTime").toString()),TVehcertUploadLog::getUpDate,tVehcertUploadLog.getParams().containsKey("endTime")&&StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("endTime").toString())?sdfs.parse(tVehcertUploadLog.getParams().get("endTime").toString()+" 23:59:59"):"") );如何再加一个联表查询
要实现联表查询,可以使用`leftJoin`或`innerJoin`等方法来连接关联的表,然后在查询条件中使用关联表的字段。示例代码如下:
```
List<TVehcertUploadLog> list = tVehcertUploadLogService.list(new LambdaQueryWrapper<TVehcertUploadLog>()
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getVin()), TVehcertUploadLog::getVin, tVehcertUploadLog.getVin())
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getVehWzhgzbh()), TVehcertUploadLog::getVehWzhgzbh, tVehcertUploadLog.getVehWzhgzbh())
.like(StringUtils.isNotBlank(tVehcertUploadLog.getBz()), TVehcertUploadLog::getBz, tVehcertUploadLog.getBz())
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsValid()), TVehcertUploadLog::getIsValid, tVehcertUploadLog.getIsValid())
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsSample()), TVehcertUploadLog::getIsSample, tVehcertUploadLog.getIsSample())
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getCreateBy()), TVehcertUploadLog::getCreateBy, tVehcertUploadLog.getCreateBy())
.ge(tVehcertUploadLog.getParams().containsKey("startTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString()), TVehcertUploadLog::getUpDate, tVehcertUploadLog.getParams().containsKey("startTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString()) ? sdf.parse(tVehcertUploadLog.getParams().get("startTime").toString()) : "")
.le(tVehcertUploadLog.getParams().containsKey("endTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("endTime").toString()), TVehcertUploadLog::getUpDate, tVehcertUploadLog.getParams().containsKey("endTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("endTime").toString()) ? sdfs.parse(tVehcertUploadLog.getParams().get("endTime").toString() + " 23:59:59") : "")
.leftJoin(TVehcert.class, TVehcert::getVehId, TVehcertUploadLog::getVehId)
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getVehXh()), TVehcert::getVehXh, tVehcertUploadLog.getVehXh())
);
```
上述代码中,使用了`leftJoin`方法将`TVehcertUploadLog`表与`TVehcert`表关联,关联条件是`TVehcertUploadLog`表的`vehId`字段与`TVehcert`表的`vehId`字段相等。然后在查询条件中使用了`TVehcert`表的`vehXh`字段进行查询。
List<TVehcertUploadLog> list = tVehcertUploadLogService.list(new LambdaQueryWrapper<TVehcertUploadLog>().eq(StringUtils.isNotBlank(tVehcertUploadLog.getVin()),TVehcertUploadLog::getVin,tVehcertUploadLog.getVin()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getVehWzhgzbh()),TVehcertUploadLog::getVehWzhgzbh,tVehcertUploadLog.getVehWzhgzbh()) .like(StringUtils.isNotBlank(tVehcertUploadLog.getBz()),TVehcertUploadLog::getBz,tVehcertUploadLog.getBz()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsValid()),TVehcertUploadLog::getIsValid,tVehcertUploadLog.getIsValid()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsSample()),TVehcertUploadLog::getIsSample,tVehcertUploadLog.getIsSample()) .eq(StringUtils.isNotBlank(tVehcertUploadLog.getCreateBy()),TVehcertUploadLog::getCreateBy,tVehcertUploadLog.getCreateBy()) .ge(tVehcertUploadLog.getParams().containsKey("startTime")&&StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString()), TVehcertUploadLog::getUpDate,tVehcertUploadLog.getParams().containsKey("startTime")&&StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString())?sdf.parse(tVehcertUploadLog.getParams().get("startTime").toString()):"") .le(tVehcertUploadLog.getParams().containsKey("endTime")&&StringUtils.isNotEmpty(tVehcertUploadLog .getParams().get("endTime").toString()),TVehcertUploadLog::getUpDate,tVehcertUploadLog.getParams().containsKey("endTime")&&StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("endTime").toString())?sdfs.parse(tVehcertUploadLog.getParams().get("endTime").toString()+" 23:59:59"):"") );如何在没有.leftJoin(TVehcert.class, TVehcert::getVehId, TVehcertUploadLog::getVehId)的情况下再加一个联表查询
您可以使用子查询来进行联表查询,将需要联表查询的表放在子查询中,然后通过WHERE条件将子查询的结果与主查询的结果关联起来。例如:
```
List<TVehcertUploadLog> list = tVehcertUploadLogService.list(new LambdaQueryWrapper<TVehcertUploadLog>()
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getVin()), TVehcertUploadLog::getVin, tVehcertUploadLog.getVin())
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getVehWzhgzbh()), TVehcertUploadLog::getVehWzhgzbh, tVehcertUploadLog.getVehWzhgzbh())
.like(StringUtils.isNotBlank(tVehcertUploadLog.getBz()), TVehcertUploadLog::getBz, tVehcertUploadLog.getBz())
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsValid()), TVehcertUploadLog::getIsValid, tVehcertUploadLog.getIsValid())
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getIsSample()), TVehcertUploadLog::getIsSample, tVehcertUploadLog.getIsSample())
.eq(StringUtils.isNotBlank(tVehcertUploadLog.getCreateBy()), TVehcertUploadLog::getCreateBy, tVehcertUploadLog.getCreateBy())
.ge(tVehcertUploadLog.getParams().containsKey("startTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString()), TVehcertUploadLog::getUpDate, tVehcertUploadLog.getParams().containsKey("startTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("startTime").toString()) ? sdf.parse(tVehcertUploadLog.getParams().get("startTime").toString()) : "")
.le(tVehcertUploadLog.getParams().containsKey("endTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("endTime").toString()), TVehcertUploadLog::getUpDate, tVehcertUploadLog.getParams().containsKey("endTime") && StringUtils.isNotEmpty(tVehcertUploadLog.getParams().get("endTime").toString()) ? sdfs.parse(tVehcertUploadLog.getParams().get("endTime").toString() + " 23:59:59") : "")
.inSql(TVehcertUploadLog::getVehId, "SELECT veh_id FROM t_vehcert WHERE veh_type = 'car'")
);
```
在本例中,我们使用了 `inSql` 方法来将子查询的结果与主查询的结果进行关联。子查询语句为 `SELECT veh_id FROM t_vehcert WHERE veh_type = 'car'`,它将返回所有车辆类型为 'car' 的车辆 ID。然后我们将这些车辆 ID 作为 `inSql` 方法的参数,将它们与 `TVehcertUploadLog` 表中的 `veh_id` 列进行比较,从而获取符合条件的 `TVehcertUploadLog` 记录。
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