mybatisplus的wrapper使用

MybatisPlus的Wrapper是一个查询条件构造器，用于构建SQL查询条件。它可以通过链式调用的方式，构建出复杂的查询条件，包括等于、不等于、大于、小于、模糊查询等。使用Wrapper可以避免手写SQL语句，提高开发效率。同时，Wrapper还支持动态SQL，可以根据不同的条件动态生成SQL查询语句。在使用Wrapper时，需要注意Wrapper的使用方式和语法，以及Wrapper的常用方法和参数。

相关问题

mybatisplus wrapper orand

MyBatis-Plus (also known as MyBatis+) is an enhanced version of the MyBatis framework. It provides additional features and utilities to simplify the development process.

The `Wrapper` class in MyBatis-Plus is used to construct SQL queries dynamically. It provides a set of methods that can be used to add conditions to the query. For example, `eq` adds an equal condition, `like` adds a like condition, and so on. `Wrapper` also supports nested queries and complex conditions.

`or` and `and` are two methods provided by the `Wrapper` class to specify how the conditions should be combined. `and` is used to add conditions that must all be true, while `or` is used to add conditions where at least one must be true.

In summary, `Wrapper` is a powerful tool for constructing dynamic SQL queries in MyBatis-Plus, and `or` and `and` are two methods that can be used to combine conditions in the query.

mybatisplus wrapper 清空表

对于MybatisPlus的Wrapper，如果想要清空表，可以使用如下方式：

Wrapper wrapper = new Wrapper() {
    @Override
    public String getSqlSegment() {
        return "truncate table table_name";
    }
};
myMapper.delete(wrapper);

其中，`truncate table table_name`是清空表的SQL语句，通过Wrapper传递给MybatisPlus的delete方法，可以实现清空表的功能。