我正在尝试使用 MyBatis3 中的<collection>。但是，构成List/collection一部分的所有项目始终为NULL。
这就是我的SQL-
<select id="fetchPaymentWorkingALL" resultType="paymentWorkingALL" parameterType="java.util.Map">
select
(person_id + '-' + convert(char(10), end_date, 126) + '-' + company + '-' + plan) as paymentid
,person_id as personid
,(person_id + '-' + convert(char(10), end_date, 126) + '-' + company + '-' + plan + '-' + 'non_mid_year') as otherid
,'non_mid_year' as typename
,'0' as typeid
,sum(amount) as amount
,sum(return1_amount) + sum(return2_amount) as returnamount
,sum(endamount) as endamount
from #ABCD
group by person_id, income_type, end_date, company, plan, plan_id
</select>
查询的输出看起来像这样-
paymentid | personid | otherid | typename | typeid | amount | returnamount | endamount
---------------------------------|-------------|-----------------------------------------------|-----------------|---------|-------------------|---------------|------------------
3520-2017-12-31-ABCD-Mandatory | 3520 | 3520-2017-12-31-ABCD-Mandatory-non_mid_year | non_mid_year | 0 | 10000.0000 | 1200.0000 | 11200.0000
3520-2017-12-31-ABCD-Mandatory | 3520 | 3520-2017-12-31-ABCD-Mandatory-total | total | 2 | 10000.0000 | 1200.0000 | 11200.0000
3520-2018-12-31-ABCD-Mandatory | 3520 | 3520-2018-12-31-ABCD-Mandatory-mid_year | mid_year | 1 | 15000.0000 | 1150.0000 | 16150.0000
3520-2018-12-31-ABCD-Mandatory | 3520 | 3520-2018-12-31-ABCD-Mandatory-non_mid_year | non_mid_year | 0 | 10000.0000 | 1200.0000 | 11200.0000
3520-2018-12-31-ABCD-Mandatory | 3520 | 3520-2018-12-31-ABCD-Mandatory-total | total | 2 | 25000.0000 | 2350.0000 | 27350.0000
3520-2019-12-31-EFGH-Mandatory | 3520 | 3520-2019-12-31-EFGH-Mandatory-non_mid_year | non_mid_year | 0 | 10000.0000 | 1200.0000 | 11200.0000
3520-2019-12-31-EFGH-Mandatory | 3520 | 3520-2019-12-31-EFGH-Mandatory-total | total | 2 | 10000.0000 | 1200.0000 | 11200.0000
3520-2019-12-31-ABCD-Mandatory | 3520 | 3520-2019-12-31-ABCD-Mandatory-mid_year | mid_year | 1 | 15000.0000 | 1150.0000 | 16150.0000
3520-2019-12-31-ABCD-Mandatory | 3520 | 3520-2019-12-31-ABCD-Mandatory-non_mid_year | non_mid_year | 0 | 10000.0000 | 1200.0000 | 11200.0000
3520-2019-12-31-ABCD-Mandatory | 3520 | 3520-2019-12-31-ABCD-Mandatory-total | total | 2 | 25000.0000 | 2350.0000 | 27350.0000
3520-2020-12-31-ABCD-Mandatory | 3520 | 3520-2020-12-31-ABCD-Mandatory-mid_year | mid_year | 1 | 15000.0000 | 1150.0000 | 16150.0000
3520-2020-12-31-ABCD-Mandatory | 3520 | 3520-2020-12-31-ABCD-Mandatory-total | total | 2 | 15000.0000 | 1150.0000 | 16150.0000
resultMaps看起来像这样-
<resultMap id="paymentWorkingALL" type="PaymentWorkingALL">
<id property="paymentid" column="paymentid" />
<result property="personid" column="personid" />
<collection property="paymentWorkings"
ofType="PaymentWorking"
resultMap="paymentWorkingMap" />
</resultMap>
<resultMap id="paymentWorkingMap" type="PaymentWorking">
<id property="otherid" column="otherid" />
<result property="typename" column="typename"/>
<result property="typeid" column="typeid"/>
<result property="amount" column="amount"/>
<result property="endamount" column="endamount"/>
<result property="returnamount" column="returnamount"/>
</resultMap>
我还像这样添加了别名-
<typeAlias type="com.abcd.PaymentWorkingALL" alias="PaymentWorkingALL"/>
<typeAlias type="com.abcd.PaymentWorking" alias="PaymentWorking"/>
我的课程看起来像这样-
public class PaymentWorkingALL {
private String paymentid;
private String personid;
private List<PaymentWorking> paymentWorkings;
public String getPaymentid() {
return paymentid;
}
public void setPaymentid(String paymentid) {
this.paymentid = paymentid;
}
public String getPersonid() {
return personid;
}
public void setPersonid(String personid) {
this.personid = personid;
}
public List<PaymentWorking> getPaymentWorkings() {
return paymentWorkings;
}
public void setPaymentWorkings(List<PaymentWorking> paymentWorkings) {
this.paymentWorkings = paymentWorkings;
}
}
public class PaymentWorking {
private String otherid;
private String typename;
private String typeid;
private Double amount;
private Double returnamount;
private Double endamount;
public String getOtherid() {
return otherid;
}
public void setOtherid(String otherid) {
this.otherid = otherid;
}
public String getTypename() {
return typename;
}
public void setTypename(String typename) {
this.typename = typename;
}
public String getTypeid() {
return typeid;
}
public void setTypeid(String typeid) {
this.typeid = typeid;
}
public Double getAmount() {
return amount;
}
public void setAmount(Double amount) {
this.amount = amount;
}
public Double getReturnamount() {
return returnamount;
}
public void setReturnamount(Double returnamount) {
this.returnamount = returnamount;
}
public Double getEndamount() {
return endamount;
}
public void setEndamount(Double endamount) {
this.endamount = endamount;
}
}
我的期望是我会得到一个看起来像这样的列表-
[
{
"paymentid": "3520-2017-12-31-ABCD-Mandatory",
"personid": "3520",
"paymentWorkings": [
{
"otherid": "3520-2017-12-31-ABCD-Mandatory-non_mid_year",
"typename": "non_mid_year",
"typeid": "0",
"amount": 10000.00,
"returnamount": 1200.00,
"endamount": 11200.00
},
{
"otherid": "3520-2017-12-31-ABCD-Mandatory-total",
"typename": "total",
"typeid": "2",
"amount": 10000.00,
"returnamount": 1200.00,
"endamount": 11200.00
}
]
},
{
"paymentid": "3520-2018-12-31-ABCD-Mandatory",
"personid": "3520",
"paymentWorkings": [
{
"otherid": "3520-2018-12-31-ABCD-Mandatory-non_mid_year",
"typename": "non_mid_year",
"typeid": "0",
"amount": 10000.00,
"returnamount": 1200.00,
"endamount": 11200.00
},
{
"otherid": "3520-2018-12-31-ABCD-Mandatory-mid_year",
"typename": "mid_year",
"typeid": "1",
"amount": 15000.00,
"returnamount": 1150.00,
"endamount": 16150.00
},
{
"otherid": "3520-2018-12-31-ABCD-Mandatory-total",
"typename": "total",
"typeid": "2",
"amount": 25000.00,
"returnamount": 2350.00,
"endamount": 27350.00
}
]
}
]
但是，当查询运行时，我得到一个List<PaymentWorkingALL>，大小为 12 ，每个都有paymentWorkings作为NULL。
据我了解，它应该返回长度为 5 的List<PaymentWorkingALL>，其ID为-
'3520-2017-12-31-ABCD-Mandatory',
'3520-2018-12-31-ABCD-Mandatory',
'3520-2019-12-31-EFGH-Mandatory',
'3520-2019-12-31-ABCD-Mandatory',
'3520-2020-12-31-ABCD-Mandatory'
我正在使用以下版本的mybatis和mybatis-spring-
<mybatis.version>3.2.3</mybatis.version>
<mybatis.spring.version>1.2.0</mybatis.spring.version>
答案 0 :(得分：0)
paymentWorkingALL未使用结果图，因为您尚未指示mybatis使用它，因此有两个结果：
id的{{1}}字段是什么，并将所有行都视为唯一对象（因此结果中有12个对象）PaymentWorkingALL关联根本未映射（因此未在集合中创建对象）要解决此问题，请指定结果图作为paymentWorkings节点的属性，如下所示：
select