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">
5. <sqlid="tableName">tb_order</sql>
6. <resultMaptype="Order"id="pojoResultMap"autoMapping="true">
7. <idcolumn="order_id"property="orderId"/>
8. <associationproperty="orderShipping"javaType="OrderShipping"column="order_id"select="queryOrderShippingByOrderId"autoMapping="true"></association>
9. <collectionproperty="orderItems"javaType="Arraylist"ofType="OrderItem"autoMapping="true"select="queryOrderItemByOrderId"column="order_id">
10. </collection>
11. </resultMap>
12. <selectid="queryOrderItemByOrderId"resultType="OrderItem"parameterType="String">
13. SELECT * FROM tb_order_item WHERE order_id = #{orderId};
14. </select>
15. <selectid="queryOrderShippingByOrderId"resultType="OrderShipping"parameterType="String">
16. SELECT * FROM tb_order_shipping WHERE order_id = #{orderId};
17. </select>
18. <selectid="queryList"resultMap="pojoResultMap">
19. SELECT
20. *
21. FROM
22. <includerefid="tableName"/>
23. </select>
24. <selectid="queryByID"resultMap="pojoResultMap">
25. SELECT
26. *
27. FROM
28. <includerefid="tableName"/>
29. WHERE order_id = #{id};
30. </select>
31. <selectid="queryByWhere"parameterType="Where"resultMap="pojoResultMap">
32. SELECT
33. *
34. FROM
35. <includerefid="tableName"/>
36. WHERE ${where.column} ${where.operater} #{where.value} LIMIT 1;
37. </select>
38. <selectid="queryListByWhere"parameterType="Where"resultMap="pojoResultMap">
39. SELECT
40. *
41. FROM
42. <includerefid="tableName"/>
43. WHERE ${where.column} ${where.operater} #{where.value};
44. </select>
45. <insertid="save">
46. INSERT INTO <includerefid="tableName"/> VALUES (#{orderId},#{payment},#{paymentType},#{postFee},#{status},#{createTime},#{updateTime},#{paymentTime},#{consignTime},#{endTime},#{closeTime},#{shippingName},#{shippingCode},#{userId},#{buyerMessage},#{buyerNick},#{buyerRate});
47. INSERT INTO tb_order_item VALUES
48. <foreachcollection="orderItems"item="item"separator=",">
49. (#{item.itemId},#{orderId},#{item.num},#{item.title},#{item.price},#{item.totalFee},#{item.picPath})
50. </foreach>
51. ;
52. 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());
53. </insert>
54. <updateid="update">
55. UPDATE <includerefid="tableName"/>
56. <set>
57. <iftest="payment !=null and payment != ''">
58. payment = #{payment},
59. </if>
60. <iftest="postFee !=null and postFee != ''">
61. post_fee = #{postFee},
62. </if>
63. <iftest="status !=null and status != ''">
64. status = #{status},
65. </if>
66. <iftest="updateTime !=null and updateTime != ''">
67. update_time = #{updateTime},
68. </if>
69. <iftest="paymentTime !=null and paymentTime != ''">
70. payment_time = #{paymentTime},
71. </if>
72. <iftest="consignTime !=null and consignTime != ''">
73. consign_time = #{consignTime},
74. </if>
75. <iftest="endTime !=null and endTime != ''">
76. end_time = #{endTime},
77. </if>
78. <iftest="closeTime !=null and closeTime != ''">
79. close_time = #{closeTime},
80. </if>
81. <iftest="shippingName !=null and shippingName != ''">
82. shipping_name = #{shippingName},
83. </if>
84. <iftest="shippingCode !=null and shippingCode != ''">
85. shipping_code = #{shippingCode},
86. </if>
87. <iftest="buyerMessage !=null and buyerMessage != ''">
88. buyer_message = #{buyerMessage},
89. </if>
90. <iftest="buyerRate !=null and buyerRate != ''">
91. buyer_rate = #{buyerRate},
92. </if>
93. </set>
94. WHERE order_id = #{orderId};
95. </update>
96. <deleteid="deleteByID"parameterType="Long">
97. DELETE FROM <includerefid="tableName"/> WHERE order_id = #{orderId};
98. DELETE FROM tb_order_item WHERE order_id = #{orderId};
99. </delete>
100. <deleteid="deleteByIDS"parameterType="list">
101. DELETE FROM <includerefid="tableName"/> WHERE order_id IN
102. <foreachcollection="ids"item="id"open="("close=")"separator=",">
103. #{id}
104. </foreach>;
105. DELETE FROM tb_order_item WHERE order_id IN
106. <foreachcollection="ids"item="id"open="("close=")"separator=",">
107. #{id}
108. </foreach>;
109. </delete>
110. <updateid="paymentOrderScan"parameterType="Date">
111. UPDATE tb_order SET
112. status = 6,
113. update_time = NOW(),
114. close_time = NOW(),
115. end_time = NOW()
116. WHERE status = 1 AND payment_type = 1 AND create_time <= #{date}
117. </update>
118. </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。