我有两个具有一对多关系的表格如下:
我的实体类和hbm配置如下:
AuditDetail.java
struct
AuditDetail.hbm.xml
public class AuditDetail implements Serializable {
private static final long serialVersionUID = 1L;
private String auditId;
private Timestamp startTime;
private Timestamp endTime;
Set auditParameterDataSet;
public Set getAuditParameterDataSet() {
return auditParameterDataSet;
}
public void setAuditParameterDataSet(Set auditParameterDataSet) {
this.auditParameterDataSet = auditParameterDataSet;
}
public String getAuditId() {
return auditId;
}
public void setAuditId(String auditId) {
this.auditId = auditId;
}
public void setStartTime(Timestamp startTime) {
this.startTime = startTime;
}
public Timestamp getEndTime() {
return endTime;
}
public void setEndTime(Timestamp endTime) {
this.endTime = endTime;
}
}
AuditParameter.java
<hibernate-mapping>
<class name="com.test.AuditDetail" table="AUDITDETAIL" >
<id name="auditId" column="AUDITID" type="string" />
<property name="startTime" type="java.sql.Timestamp">
<column name="STARTTIME" sql-type="VARCHAR2(50)" />
</property>
<property name="endTime" type="java.sql.Timestamp">
<column name="ENDTIME" sql-type="VARCHAR2(50)" />
</property>
<set name="auditParameterDataSet" cascade="all,delete-orphan" lazy="true" inverse="true">
<key>
<column name="AUDITID"/>
</key>
<one-to-many class="com.test.AuditParameter" />
</set>
</class>
</hibernate-mapping>
AuditParameter.hbm.xml
public class AuditParameter {
private String auditId ;
private String parameterId;
private String fieldName ;
private AuditDetail auditDetail;
public String getAuditId() {
return auditId;
}
public void setAuditId(String auditId) {
this.auditId = auditId;
}
public String getParameterId() {
return parameterId;
}
public void setParameterId(String parameterId) {
this.parameterId = parameterId;
}
public String getFieldName() {
return fieldName;
}
public void setFieldName(String fieldName) {
this.fieldName = fieldName;
}
public AuditDetail auditDetail() {
return auditDetail;
}
public void setAuditDetail(AuditDetail auditDetail) {
this.auditDetail = auditDetail;
}
}
我的hql查询是以下内容:
<hibernate-mapping>
<class name="com.test.AuditParameter" table="AUDITPARAMETER" >
<id name="parameterId" type="string">
<column name="PARAMETERID" sql-type="VARCHAR2(50)" />
</id>
<many-to-one name="auditDetail" class="com.test.AuditDetail" column="AUDITID" insert="false" update="false" lazy="false">
</many-to-one>
<property name="auditId" type="string">
<column name="AUDITID" sql-type="VARCHAR2(50)" not-null="false" />
</property>
<property name="fieldName" type="string">
<column name="FIELDNAME" sql-type="VARCHAR2(50)" />
</property>
</class>
</hibernate-mapping>
但是当我执行此查询时,它会出现以下错误:
ORA-00936:缺少表达
以下是我的控制台输出查询被触发。
select a.auditId, a.startTime, a.endTime, a.auditParameterDataSet from AuditDetail a;
根据这个输出,我们可以看到hibernate没有为a.auditParameterDataSet生成列名。为什么会这样?我在哪里做错了?
答案 0 :(得分:3)
您必须使用join: -
HQL: -
select a.auditId, a.startTime, a.endTime, auditParameterDataSet from AuditDetail join a.auditParameterDataSet auditParameterDataSet;
标准: -
Criteria criteria = session.createCriteria(AuditDetail.class);
criteria.setFetchMode("auditParameterDataSet", FetchMode.EAGER);