Hibernate many-to-many的查询
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有三个表user,role,user_role.user和role通过user-role进行多对多关联,
user类role类,及映射文件如下
import java.util.*;
public class User implements java.io.Serializable {
private int id;
private String username;
private Set SetOfUserRole;
private void setId (int id) {
this.id = id;
}
public int getId() {
return id;
}
public void setUsername(String name) {
this.username = name;
}
public String getUsername() {
return username();
}
public Set getSetOfUserRole () {
return this.SetOfUserRole;
}
public void setSetOfUserRole (Set SetOfUserRole) {
this.SetOfUserRole = SetOfUserRole;
}
}
public class Role implements java.io.Serializable {
private int id;
private String rolename;
private Set SetOfUserRole;
private void setId (int id) {
this.id = id;
}
public int getId() {
return id;
}
public void setRolename(String name) {
this.rolename = name;
}
public String getRolename() {
return rolename();
}
public Set getSetOfUserRole () {
return this.SetOfUserRole;
}
public void setSetOfUserRole (Set SetOfUserRole) {
this.SetOfUserRole = SetOfUserRole;
}
}
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!--
Auto-generated mapping file from
the hibernate.org cfg2hbm engine
-->
<class
name="User"
table="user"
schema="dbo"
lazy="false"
>
<id
name="Id"
type="int"
>
<column name="id" not-null="true" unique="true" />
<generator class="identity" />
</id>
<property
name="username"
type="java.lang.String"
>
<column name="user_name" length="20"/>
</property>
<set
name="SetOfUserrole"
table="user_role"
lazy="true"
inverse="false"
cascade="save-update"
>
<key>
<column name="user_id" length="10" />
</key>
<many-to-many
class="Role"
column="role_id"
outer-join="auto"
/>
</set>
</class>
</hibernate-mapping>
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<!--
Auto-generated mapping file from
the hibernate.org cfg2hbm engine
-->
<class
name=Role"
table="role"
schema="dbo"
lazy="false"
>
<id
name="Id"
type="int"
>
<column name="id" not-null="true" unique="true" />
<generator class="identity" />
</id>
<property
name="username"
type="java.lang.String"
>
<column name="role_name" length="20"/>
</property>
<set
name="SetOfUserrole"
table="user_role"
lazy="true"
inverse="false"
cascade="save-update"
>
<key>
<column name="role_id" length="10" />
</key>
<many-to-many
class="User"
column="user_id"
outer-join="auto"
/>
</set>
</class>
</hibernate-mapping>
我想查找roleid为1,2,3的用户,并且按用户名排序,如何用hql查询?
select user from User as user left join user.SetOfUserRole as role
where role.id in (1,2,3) order by user.username
其实就是把set可以当作set中的对象来读取
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