java - 你如何使用@index和hibernate在一个字段上放置多个索引

Question

给定表中的两个字段，我可以创建一个包含这两个字段的索引，如下所示：

@org.hibernate.annotations.Index(name = "IDX_REPORTID_RECNO")
private Integer reportId;

@org.hibernate.annotations.Index(name = "IDX_REPORTID_RECNO")
private Integer recNo;

我可以单独在每一列上创建索引

@org.hibernate.annotations.Index(name = "IDX_REPORTID")
private Integer reportId;

@org.hibernate.annotations.Index(name = "IDX_RECNO")
private Integer recNo;

但是它不允许我两者都做，这似乎是不允许的

@org.hibernate.annotations.Index(name = "IDX_REPORTID_RECNO")
@org.hibernate.annotations.Index(name = "IDX_REPORTID")
private Integer reportId;

@org.hibernate.annotations.Index(name = "IDX_REPORTID_RECNO")
@org.hibernate.annotations.Index(name = "IDX_RECNO")
private Integer recNo;

我怎样才能做到这一点 ？

Answer 1

我认为您可以在类级别指定第二个索引：

@org.hibernate.annotations.Table(indexes = 
    @org.hibernate.annotations.Index(name = "IDX_REPORTID_RECNO",
        columnNames = {"reportId", "recNo"})
)
public class MyEntity {
    @org.hibernate.annotations.Index(name = "IDX_REPORTID")
    private Integer reportId;

    @org.hibernate.annotations.Index(name = "IDX_RECNO")
    private Integer recNo;
}