Mybatis中的延迟加载的使用方法

Mybatis中的延迟加载的使用方法

在Mybatis中查询订单，然后带出商品信息和快递信息的配置方法 orderMapper.xml配置如下

1. <?xml version="1.0" encoding="UTF-8"?>
2. <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
3. "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
4. <mappernamespace="com.taotao.store.order.mapper.OrderMapper">
6. <sqlid="tableName">tb_order</sql>
8. <resultMaptype="Order"id="pojoResultMap"autoMapping="true">
9. <idcolumn="order_id"property="orderId"/>
10. <associationproperty="orderShipping"javaType="OrderShipping"column="order_id"select="queryOrderShippingByOrderId"autoMapping="true"></association>
11. <collectionproperty="orderItems"javaType="Arraylist"ofType="OrderItem"autoMapping="true"select="queryOrderItemByOrderId"column="order_id">
12. </collection>
13. </resultMap>
15. <selectid="queryOrderItemByOrderId"resultType="OrderItem"parameterType="String">
16. SELECT * FROM tb_order_item WHERE order_id = #{orderId};
17. </select>
19. <selectid="queryOrderShippingByOrderId"resultType="OrderShipping"parameterType="String">
20. SELECT * FROM tb_order_shipping WHERE order_id = #{orderId};
21. </select>
23. <selectid="queryList"resultMap="pojoResultMap">
24. SELECT
25. *
26. FROM
27. <includerefid="tableName"/>
28. </select>
30. <selectid="queryByID"resultMap="pojoResultMap">
31. SELECT
32. *
33. FROM
34. <includerefid="tableName"/>
35. WHERE order_id = #{id};
36. </select>
38. <selectid="queryByWhere"parameterType="Where"resultMap="pojoResultMap">
39. SELECT
40. *
41. FROM
42. <includerefid="tableName"/>
43. WHERE ${where.column} ${where.operater} #{where.value} LIMIT 1;
44. </select>
46. <selectid="queryListByWhere"parameterType="Where"resultMap="pojoResultMap">
47. SELECT
48. *
49. FROM
50. <includerefid="tableName"/>
51. WHERE ${where.column} ${where.operater} #{where.value};
52. </select>
54. <insertid="save">
55. INSERT INTO <includerefid="tableName"/> VALUES (#{orderId},#{payment},#{paymentType},#{postFee},#{status},#{createTime},#{updateTime},#{paymentTime},#{consignTime},#{endTime},#{closeTime},#{shippingName},#{shippingCode},#{userId},#{buyerMessage},#{buyerNick},#{buyerRate});
56. INSERT INTO tb_order_item VALUES
57. <foreachcollection="orderItems"item="item"separator=",">
58. (#{item.itemId},#{orderId},#{item.num},#{item.title},#{item.price},#{item.totalFee},#{item.picPath})
59. </foreach>
60. ;
61. INSERT INTO tb_order_shipping VALUES (#{orderId},#{orderShipping.receiverName},#{orderShipping.receiverPhone},#{orderShipping.receiverMobile},#{orderShipping.receiverState},#{orderShipping.receiverCity},#{orderShipping.receiverDistrict},#{orderShipping.receiverAddress},#{orderShipping.receiverZip},NOW(),NOW());
62. </insert>
64. <updateid="update">
65. UPDATE <includerefid="tableName"/>
66. <set>
67. <iftest="payment !=null and payment != ''">
68. payment = #{payment},
69. </if>
70. <iftest="postFee !=null and postFee != ''">
71. post_fee = #{postFee},
72. </if>
73. <iftest="status !=null and status != ''">
74. status = #{status},
75. </if>
76. <iftest="updateTime !=null and updateTime != ''">
77. update_time = #{updateTime},
78. </if>
79. <iftest="paymentTime !=null and paymentTime != ''">
80. payment_time = #{paymentTime},
81. </if>
82. <iftest="consignTime !=null and consignTime != ''">
83. consign_time = #{consignTime},
84. </if>
85. <iftest="endTime !=null and endTime != ''">
86. end_time = #{endTime},
87. </if>
88. <iftest="closeTime !=null and closeTime != ''">
89. close_time = #{closeTime},
90. </if>
91. <iftest="shippingName !=null and shippingName != ''">
92. shipping_name = #{shippingName},
93. </if>
94. <iftest="shippingCode !=null and shippingCode != ''">
95. shipping_code = #{shippingCode},
96. </if>
97. <iftest="buyerMessage !=null and buyerMessage != ''">
98. buyer_message = #{buyerMessage},
99. </if>
100. <iftest="buyerRate !=null and buyerRate != ''">
101. buyer_rate = #{buyerRate},
102. </if>
103. </set>
104. WHERE order_id = #{orderId};
105. </update>
107. <deleteid="deleteByID"parameterType="Long">
108. DELETE FROM <includerefid="tableName"/> WHERE order_id = #{orderId};
109. DELETE FROM tb_order_item WHERE order_id = #{orderId};
110. </delete>
112. <deleteid="deleteByIDS"parameterType="list">
113. DELETE FROM <includerefid="tableName"/> WHERE order_id IN
114. <foreachcollection="ids"item="id"open="("close=")"separator=",">
115. #{id}
116. </foreach>;
117. DELETE FROM tb_order_item WHERE order_id IN
118. <foreachcollection="ids"item="id"open="("close=")"separator=",">
119. #{id}
120. </foreach>;
121. </delete>
123. <updateid="paymentOrderScan"parameterType="Date">
124. UPDATE tb_order SET
125. status = 6,
126. update_time = NOW(),
127. close_time = NOW(),
128. end_time = NOW()
129. WHERE status = 1 AND payment_type = 1 AND create_time <= #{date}
130. </update>
132. </mapper>

其中此代表延迟加载

1. <resultMaptype="Order"id="pojoResultMap"autoMapping="true">
2. <idcolumn="order_id"property="orderId"/>
3. <associationproperty="orderShipping"javaType="OrderShipping"column="order_id"select="queryOrderShippingByOrderId"autoMapping="true"></association>
4. <collectionproperty="orderItems"javaType="Arraylist"ofType="OrderItem"autoMapping="true"select="queryOrderItemByOrderId"column="order_id">
5. </collection>
6. </resultMap>

调用方法：

1. http://order.taotao.com/order/query/31537859410409

返回数据JSON

1. {
2. "orderId":"31537859410409",
3. "payment":"5288",
4. "paymentType":null,
5. "postFee":"0",
6. "status":1,
7. "createTime":1537859410000,
8. "updateTime":1537859410000,
9. "paymentTime":null,
10. "consignTime":null,
11. "endTime":null,
12. "closeTime":null,
13. "shippingName":null,
14. "shippingCode":null,
15. "userId":3,
16. "buyerMessage":null,
17. "buyerNick":"zhang123",
18. "buyerRate":0,
19. "orderItems":[
20. {
21. "itemId":9,
22. "orderId":"31537859410409",
23. "num":1,
24. "title":"苹果（Apple）iPhone 6 (A1586) 16GB 金色 移动联通电信4G手机3",
25. "price":5288,
26. "totalFee":5288,
27. "picPath":"http://image.taotao.com/images/2015/03/06/2015030610045320609720.jpg"
28. }
29. ],
30. "orderShipping":{
31. "orderId":"31537859410409",
32. "receiverName":"张志君",
33. "receiverPhone":"",
34. "receiverMobile":"15800000000",
35. "receiverState":"上海",
36. "receiverCity":"上海",
37. "receiverDistrict":"闵行区",
38. "receiverAddress":"三鲁公路3279号 明浦广场 3号楼 205室",
39. "receiverZip":"200000",
40. "created":1537859410000,
41. "updated":1537859410000
42. }
43. }

查询出的结果包括订单信息以及订单商品信息还有快递信息

主要内容是根据传智播客视频学习总结的小结。