How to query today’s data in Java using QueryWrapper?

You can achieve querying the data for the current day in Java using QueryWrapper by following these steps:

1. First, create a QueryWrapper object to build the query conditions. The LambdaQueryWrapper class can be used to simplify code writing.

QueryWrapper<Entity> queryWrapper = new QueryWrapper<>();

1. Then, utilize the ge and le methods of QueryWrapper to set the query conditions, specifically the start and end time of the current day.

queryWrapper.ge("create_time", LocalDate.now().atStartOfDay())
            .le("create_time", LocalDate.now().atTime(LocalTime.MAX));

1. Finally, use the service or mapper interface of MyBatis-Plus to perform query operations, and pass in the QueryWrapper object.

List<Entity> result = entityService.list(queryWrapper);

By following the above steps, you can use QueryWrapper to query data for the current day. It’s important to note that the “ge” method in QueryWrapper represents greater than or equal to, while the “le” method represents less than or equal to. The above code will retrieve data with a “create_time” field within the range of the current day.