[英]Access Composite key in Hibernate Criteria
I have the following tables with relationship ManyToMany 我有以下表格与ManyToMany的关系
Task Table: 任务表:
[TASK_ID] pk
,[TASK_NAME]
Option Table: 选项表:
[OPTION_ID] pk
,[OPTION_VALUE]
and the task_options Table which contain composite primary key from the two foreign keys of the previous tables 和task_options表包含来自前面表的两个外键的复合主键
[TASK_ID]
,[OPTION_ID]
and it's Mapping as follow: 它的映射如下:
Task_Options.java
@Entity
@Table(name = "TASK_OPTIONS")
public class Task_Options implements Serializable {
@EmbeddedId
private pk pk;
@ManyToOne
@MapsId("Task_ID")
private Task task;
@ManyToOne
@MapsId("Option_ID")
private Options options;
public Task getTask() {
return task;
}
public void setTask(Task task) {
this.task = task;
}
public Options getOptions() {
return options;
}
public void setOptions(Options options) {
this.options = options;
}
/*Inner Class for Composite primary key*/
@Embeddable
public static class pk implements Serializable {
private int Task_ID;
private int Option_ID;
public pk(int Task_ID, int Option_ID) {
this.Task_ID = Task_ID;
this.Option_ID = Option_ID;
}
@Override
public int hashCode() {
int hash = 7;
hash = 47 * hash + this.Task_ID;
hash = 47 * hash + this.Option_ID;
return hash;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
final pk other = (pk) obj;
if (this.Task_ID != other.Task_ID) {
return false;
}
if (this.Option_ID != other.Option_ID) {
return false;
}
return true;
}
}
}
i want create hibernate criteria to execute the following query 我想创建hibernate标准来执行以下查询
select OPTION_VALUE from [dbo].[OPTION] AS op
INNER JOIN [dbo].[TASK_OPTIONS] AS TSOP ON op.OPTION_ID = TSOP.OPTION_ID
INNER JOIN [dbo].[TASK] AS tsk ON tsk.TASK_ID = TSOP.TASK_ID
Where Tsk.TASK_ID = 2
i have tried this 我试过这个
Criteria criteria = session.createCriteria(Task_Options.class, "Tsop");
criteria.createAlias("Tsop.Task_ID", "task");
criteria.createAlias("Tsop.Option_ID", "op");
criteria.add(Restrictions.eqProperty("Tsop.task.Task_ID", "task.task_ID"));
criteria.add(Restrictions.eqProperty("Tsop.options.Option_ID", "op.option_ID"));
not working because of Task_ID of Task_options cannot be resolved. 因为Task_options的Task_ID无法解决而无法正常工作。
You dont need @EmbeddedId private pk pk;
你不需要
@EmbeddedId private pk pk;
. 。 Hibernate can resolve Objects mapped to ids.
Hibernate可以解析映射到id的对象。
Can you try with this criteria? 你能尝试这个标准吗?
Criteria criteria = session.createCriteria(Task_Options.class, "Tsop");
criteria.createAlias("task", "task");
criteria.createAlias("options", "op");
criteria.add(Restrictions.eqProperty("task.task_id", 2));
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