mybatis where

MyBatis provides a flexible way to construct dynamic SQL queries using the `<where>` element. The `<where>` element is used to wrap conditional statements within a `<select>`, `<update>`, or `<delete>` statement. It helps in building complex queries with various conditions.

Here is an example of how you can use the `<where>` element in MyBatis:

<select id="getUsers" resultType="User">
  SELECT *
  FROM users
  <where>
    <if test="name != null">
      AND name = #{name}
    </if>
    <if test="age != null">
      AND age = #{age}
    </if>
    <if test="city != null">
      AND city = #{city}
    </if>
  </where>
</select>

In this example, the `<where>` element is used to dynamically add conditions based on the input parameters. Each condition is wrapped within an `<if>` element, and the SQL statement is constructed accordingly.

By using the `<where>` element, you can avoid generating invalid SQL syntax when some parameters are not provided. It allows you to build queries with a variable number of conditions based on the input values.