在MyBatis中,可以通過設置resultMap中的list.size屬性來設置查詢結果的緩存。具體步驟如下:
<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
}
通過以上步驟,就可以在MyBatis中通過list.size屬性設置查詢結果的緩存。當查詢結果中包含List類型的屬性時,MyBatis會根據list.size屬性的值來確定是否對查詢結果進行緩存。