Question

我一直在努力寻找一种在liquibase中创建复合外键的方法。

我有一个表 A ，其中有一个复合PK，例如（ id1，id2 ）。我正在尝试制作另一个表 B ，其中 A.PK 被映射为 FK 。

我正在将 liquibase 与 YAML 一起使用，似乎没有加起来。

我尝试在创建表格时添加FK（因此在列标记中）

for key in sorted(zen)[::2]:
    print(zen[key])

不幸的是，此语法返回错误：

- column:
    name: id1_id2
    type: int
    constraints:
       nullable: false
       foreignKeyName: fk_id1_id2
       references: A(id1, id2)

我尝试过的另一件事是首先创建表，为所需的FK创建列，然后尝试在该列上添加FK约束。这不会引发任何错误，但不会执行任何操作（而且LB的日志在说明中说“空”）

Caused by: java.sql.SQLSyntaxErrorException: ORA-02256: number of referencing columns must match referenced columns

任何帮助将不胜感激。

谢谢

Answer 1

I don't use Liquibase, but here's how it is supposed to look like, as far as Oracle is concerned: if you want to create a composite foreign key (in the detail table), then it has to reference a composite primary key (in the master table).

Have a look at this example:

SQL> create table master
  2    (id_1 number,
  3     id_2 number,
  4     constraint pk_mas primary key (id_1, id_2));

Table created.

SQL> create table detail
  2    (id_det number constraint pk_det primary key,
  3     --
  4     id_1   number,
  5     id_2   number,
  6     constraint fk_det_mas foreign key (id_1, id_2) references master (id_1, id_2));

Table created.

SQL>

It just wouldn't work otherwise; that's why you got the error

ORA-02256: number of referencing columns must match referenced columns

because your detail table contained a single column (id1_id2) and tried to reference two columns in table A (id1, id2).

Answer 2

您尝试过addForeignKeyConstraint吗？像这样：

- changeSet:
    id: 1
    author: you
    changes:
    - addForeignKeyConstraint:
        baseColumnNames: id1, id2
        baseTableName: tableB
        constraintName: FK_tableB_tableA
        referencedColumnNames: id1, id2
        referencedTableName: tableA

如何在liquibase中添加复合外键？

2 个答案: