您好,我是 JPA 的新手。 我试图使用一列作为条件来选择一组特定的记录。 我的实体代码是根据表结构自动生成的,如下:
create table TEST.COMPUTERS(
"COLUMN1" VARCHAR2(6) not null,
"COLUMN2" VARCHAR2(10) not null,
"COLUMN3" VARCHAR2(5) not null,
"COLUMN4" VARCHAR2(8) not null,
"COLUMN5" VARCHAR2(48),
constraint "PK" primary key ("COLUMN1","COLUMN2")
);
整个类的构造函数代码:
@Table(name = "COMPUTERS", schema = "TEST")
public class Computers implements java.io.Serializable {
/** full constructor */
public Computers(ComputersId id, String column3, String column4,
String column5) {
this.id = id;
this.column3 = column3;
this.column4 = column4;
this.column5 = column5;
}
@EmbeddedId
public ComputersId getId() {
return this.id;
}
public void setId(ComputersId id) {
this.id = id;
}
// and then ....getter and setter methods for Column 3-5
然后我执行以下操作:
Query query = EntityManagerHelper.getEntityManager().createQuery("SELECT s from Computers s where s.column1 = :column1").setParameter("column1", "SONY LAPTOPS");
运行上述命令后,出现以下错误:
An error occurred while parsing the query filter "SELECT s from Computers where s.column1 = :column1". Error message: No field named "column1" in class "class Computers".
请问对此有什么指示吗?非常感谢..
最佳答案
由于 Column1 是 embededId 的一部分,因此您必须遍历 id 字段:
Query query = EntityManagerHelper.getEntityManager().createQuery("SELECT s from Computers s where s.id.column1 = :column1").setParameter("column1", "SONY LAPTOPS");
PS:你的专栏名称似乎选得相当糟糕..?也许您应该给它们起一些更具描述性的名称?
关于java - JPA 1.2 createQuery Where 子句条件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10149090/