mybatis一对一关联查询——（八）

1.需求

查询所有订单信息，关联查询下单用户信息。

注意：

　　因为一个订单信息只会是一个人下的订单，所以从查询订单信息出发关联查询用户信息为一对一查询。如果从用户信息出发查询用户下的订单信息则为一对多查询，因为一个用户可以下多个订单。

2.  方法一：resultType

使用resultType，定义订单信息po类，此po类中包括了订单信息和用户信息：

2.1     sql语句

确定查询的主表：订单表

确定查询的关联表：用户表

关联查询使用内链接？还是外链接？

由于orders表中有一个外键（user_id），通过外键关联查询用户表只能查询出一条记录，可以使用内链接。

SELECT
  orders.*,
  USER.username,
  USER.sex,
  USER.address
FROM
  orders,
  USER
WHERE orders.user_id = user.id

Normal
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7.8 磅
0
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false
false
false

EN-US
ZH-CN
X-NONE

/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
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mso-ascii-font-family:Calibri;
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mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}

2.2     创建pojo

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7.8 磅
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false
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EN-US
ZH-CN
X-NONE

/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
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mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}

将上边sql查询的结果映射到pojo中，pojo中必须包括所有查询列名。

原始的Orders.java不能映射全部字段，需要新创建的pojo。

创建一个pojo继承包括查询字段较多的po类。

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alt="" />

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7.8 磅
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false
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/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}

2.3 mapper.xml

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" alt="" />

2.4   mapper.java

aaarticlea/png;base64,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" alt="" />

2.5  测试

Public void testfindOrdersList()throws Exception{
        //获取session
        SqlSession session = sqlSessionFactory.openSession();
        //获限mapper接口实例
        UserMapper userMapper = session.getMapper(UserMapper.class);
        //查询订单信息
        List<OrdersCustom> list = userMapper.findOrdersList();
        System.out.println(list);
        //关闭session
        session.close();
    }

Normal
0

7.8 磅
0
2

false
false
false

EN-US
ZH-CN
X-NONE

总结:

　　

/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}

定义专门的po类作为输出类型，其中定义了sql查询结果集所有的字段。此方法较为简单，企业中使用普遍。

　　

　　更简单的方法是将返回值置为Map类型（resultType="map"），也就是map的key是查询的列名，更加简单。

Normal
0

7.8 磅
0
2

false
false
false

EN-US
ZH-CN
X-NONE

/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}

3. 方法二  resultMap

Normal
0

7.8 磅
0
2

false
false
false

EN-US
ZH-CN
X-NONE

/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:"Calibri","sans-serif";
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}

使用resultMap，定义专门的resultMap用于映射一对一查询结果。

3.1  sql语句

SELECT
  orders.*,
  user.username,
  user.address
FROM
  orders,
  user
WHERE orders.user_id = user.id

3.2      使用resultMap映射的思路

使用resultMap将查询结果中的订单信息映射到Orders对象中，在orders类中添加User属性，将关联查询出来的用户信息映射到orders对象中的user属性中。

3.3     需要Orders类中添加user属性

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A0ADSAaQBoANMA0ACmbZttPH8XnM+uTGsTLdZKlG/DaFbJuTbGOIEVdrbt0jDrjZu21VjADbIn06ajDGexYqK8J1TXrd7CI6vXBqZFsyfTVmZN08SsXVIP026aJAkY95/GZDOexHuseOC1kRPlu/fd6LOi5q2c6HopUT5wOBkxN8gJ3rVD0qoiy8uGZO2y6HlvcFrbSKp3jzipeFU85eULiS97tndI0sn6fFAeWebkp/UB9r5As82kvGuSOqnQEeBY0KjOzkO567NMXSvLxmNU/vBtyjSp1RRDz/f1H2lM6xp1TXw5oJ6WXaPuXWs4tfYwMaOlO6Q+fC14eqCdeU3TfYUxzc7ptINFx/OEaRekN63r1t1LmnM9DGVtYKcVEerLuR5GQmPCE8JlOddzY6+HEcXuRSHTyJZNmfPuJ5hG3qIv7SrP7ryw9OrxpRuTO8Rzdpt6TXspc3d8u/VJZuL8NJq4O73g4U2UJ2/20fJDnRt1PWVau7dQ0m8MPEU+aFp41Jln2vIxTTSttlW1Q6jlRHlnbgnTVGGmdSbQMc2Xc93jNW0UrD5atWwQWzamLYTPA1VNm3GF1u9h3THNiYQHm7hO691YnijfPByyu0NOppHG+AY0n2nOdZoVMz/jOo3ijCa+K7B+wxVNa5y0+sjTFUzzXqfRKy5Xxe486vAgtqGsTi1Sm+as+C0xbdiAKUFcOpR1t+xJ6i2ppLXHKNPIQqCwKkJHG2vtUehufI9ZJlyM2S/dZhG9OWCaGdZLxFXE2rv2yBcnWcPbUw0519eEI640lqZH/LvItQLTrgjHK2dlZjNs/C6zCwDTrgs+e9zgoHF7E0djzE3fjQWAIjANAA1gGgAawDQANIBpAGgA0wDQAKYBoAFMA0ADmAaABjANAA1gGgAawDQANIBpAGgA0wDQAKYBoAFMA0ADmAaABjANAA1gGgAawDQANFjftP/890cUFBRWYBoKikaBaSgoGgWmoaBolLSm/Xr/2TRvf/VV/fL7v+bvP39J/gNCQVmlJDXtzUdjPr72Vv32wZgPPy39VIHToFXhs535WwMFJVRSmvb6vTSg/fjTB2tAW3A4qYq97262ykdDQWElnWnfPzbmy/33vqofqr/Nl99/GN8xwkDkahM+q/YfMdu4ZcZHQ0FxSjLTXr39Yt6/81Z99+cX8+EP+o6JNs27w0mL2MZnfjQUFLekMu3dozGPb7xVfzwZ8/Sb9Wbk4aSjGzKUSTuM3AkKyrKSyLSZayGSCbNMC2zANj7ro6Gg+EoS02Yv7sebFj4rgzENJVFJYdqctZC2RB5uUpKY0zvro6GgCCWBaa/fG2kt5KcPhq2FtMWcN3t0N4g8bdiFslbRN23eWkhbYkyLscIIg5u7H3dLWIdyTtE27dXbL+bz4ytf1Xd/fjH/Vt/5qi5hmnTazLTAmygo8UXZtCU3Onr3yQ4X6YC0vfd993PBNJTFBffyo6BoFJiGgqJRsuRngHJlZfXf3dcBTENZuaTu0hsFpqGsXFJ36Y0C01BWLqm79EaBaSgrl9RdeqPsyrQ3H40x0h++55d3j0a8L2xe+f6xYTe+BO7tvPaSuEdvlT2Z9urtF2PWM631FqatXdJ26M2yJ9NWLjDtMiV1l94oyqb9ev/ZGPPxddvLjTGkO7ZD1uObfuwy431bwzvGWGNa9z6xhb5jtTJm+O6p877x78Q5nFimTLOPaH8FdvxR2Nq/+Wg+P75qp7jGGPG2bKuw70mwl5c4jXaf9A47f0e7eZKYxrAEeHxP/sv7zip3/bYHDJ2m3b+vFWkbNk1qtdw0+Qvmr95+4Sc/9PKu69PPInxLPdK0y5wGTIskkWndf2T3su2jbCh7/X78N+3QrN8PI+HYLfwTQuaktHG72TAcsZeLTfOOSM791lSGNx+t48ZNR6dM0zgNtb67L5KYxqdV7X/z9IKHzzT65uv3xrZinPP0TJnW7o1znmn2bkmfdk/P2F18ehCbYZrWaczpfjdEWtO6/2M6pknPWhVNGwV792jVskFs2ZgWWZyvt0od9PvHZvyMgS/FXsY0ldPQ78S7YAPXab0bsmneqzs+YjSfyTRydIbhmDbQ98h21uo9w4kuPm5mX+o4n8Ve6RH68SLT6A67D3Lh03AXpWb3wdsgtWnOytgS04YNmBLEpebtu27Zk+khn8lI3F/wIvfGPiA/VsQCRrCQ3y/v39HH117qNLoZ6biN+18FTOrZI8oVlF/Zr7DUXXqjwDSU88qbjwar/BHANJTFxfojzVAS9+itcsN3Y6FcpqTu0htl/eeIAABcYBoAGvwfdZhi0pae2iAAAAAASUVORK5CYII=" alt="" />

3.4   mapper.xml

3.4.1           定义resultMap

<!-- 订单查询关联用户的resultMap
    将整个查询的结果映射到cn.itcast.mybatis.po.Orders中
     -->
    <resultMap type="cn.itcast.mybatis.po.Orders" id="OrdersUserResultMap">
        <!-- 配置映射的订单信息 -->
        <!-- id：指定查询列中的唯 一标识，订单信息的中的唯 一标识，如果有多个列组成唯一标识，配置多个id
            column：订单信息的唯 一标识 列
            property：订单信息的唯 一标识 列所映射到Orders中哪个属性
          -->
        <id column="id" property="id"/>
        <result column="user_id" property="userId"/>
        <result column="number" property="number"/>
        <result column="createtime" property="createtime"/>
        <result column="note" property=note/>

        <!-- 配置映射的关联的用户信息 -->
        <!-- association：用于映射关联查询单个对象的信息
        property：要将关联查询的用户信息映射到Orders中哪个属性
         -->
        <association property="user"  javaType="cn.itcast.mybatis.po.User">
            <!-- id：关联查询用户的唯 一标识
            column：指定唯 一标识用户信息的列
            javaType：映射到user的哪个属性
             -->
            <id column="user_id" property="id"/>
            <result column="username" property="username"/>
            <result column="sex" property="sex"/>
            <result column="address" property="address"/>

        </association>
    </resultMap>

　　3.4.2          statement定义

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" alt="" />

　　

　　3.4.3 mapper接口

public List<Orders> findOrdersListResultMap() throws Exception;

3.5  总结:

使用association完成关联查询，将关联查询信息映射到pojo对象中。

4.两种方法比较

　　resultType：使用resultType实现较为简单，如果pojo中没有包括查询出来的列名，需要增加列名对应的属性，即可完成映射。(也可以直接将返回类型置为map)

　　如果没有查询结果的特殊要求建议使用resultType。

　　resultMap：需要单独定义resultMap，实现有点麻烦，如果对查询结果有特殊的要求，使用resultMap可以完成将关联查询映射pojo的属性中。

　　resultMap可以实现延迟加载，resultType无法实现延迟加载。

Normal
0

7.8 磅
0
2

false
false
false

EN-US
ZH-CN
X-NONE

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