在MyBatis中,可以通过设置resultMap中的list.size属性来设置查询结果的缓存。具体步骤如下:
<resultMap id="userMap" type="User">
<id property="id" column="id" />
<result property="username" column="username" />
<result property="age" column="age" />
<collection property="orders" ofType="Order" resultMap="orderMap" list.size="ordersSize" />
</resultMap>
<select id="getUser" resultMap="userMap">
SELECT * FROM user WHERE id = #{id}
</select>
public class User {
private Long id;
private String username;
private Integer age;
private List<Order> orders;
private Integer ordersSize;
// setter and getter methods
}
通过以上步骤,就可以在MyBatis中通过list.size属性设置查询结果的缓存。当查询结果中包含List类型的属性时,MyBatis会根据list.size属性的值来确定是否对查询结果进行缓存。