mybatisplus querywrapper isnull

MyBatis-Plus QueryWrapper provides a convenient way to construct SQL queries in MyBatis, including conditions like "IS NULL". To use the "IS NULL" condition in QueryWrapper, you can use the method `isNull` on the desired column. Here's an example:

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

QueryWrapper<Entity> queryWrapper = new QueryWrapper<>();
queryWrapper.isNull("column_name");

In the above example, replace `"column_name"` with the actual name of the column in your entity where you want to check for null values. This will generate a SQL condition for checking if the specified column is null.

You can also combine multiple conditions using other methods provided by QueryWrapper, such as `eq`, `ne`, `gt`, `ge`, `lt`, `le`, etc.