Question

由于我们数据库的重构，我希望重命名数据库中的一些外键。我们想要应用的外键名称的格式根据关系的基数而不同（目前我们只有1-n和1-1）。

我想确定所有1-1外键关系，以便我对这些关键字应用不同的命名模板。我不知道如何实现这一目标。到目前为止，我只能列出与此查询的所有外键关系：

SELECT RC.CONSTRAINT_NAME FK_Name
, KP.TABLE_NAME PK_Table
, KF.TABLE_NAME FK_Table
, KP.COLUMN_NAME PK_Column
, KF.COLUMN_NAME FK_Column
, RC.UNIQUE_CONSTRAINT_NAME PK_Name
, KP.TABLE_SCHEMA PK_Schema
, RC.MATCH_OPTION MatchOption
, RC.UPDATE_RULE UpdateRule
, RC.DELETE_RULE DeleteRule
FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS RC
JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE KF ON RC.CONSTRAINT_NAME = KF.CONSTRAINT_NAME
JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE KP ON RC.UNIQUE_CONSTRAINT_NAME = KP.CONSTRAINT_NAME

SSMS显然可以提取这些数据，因为在图表查看器中它显示两种类型的关系（在连接线的两端都有一个键）。

感谢任何帮助。

Answer 1

我相信我在sqlmetal用于生成映射的查询的帮助下找到了它：

select RC.CONSTRAINT_NAME FK_Name
, KP.TABLE_NAME PK_Table
, KF.TABLE_NAME FK_Table
, KP.COLUMN_NAME PK_Column
, KF.COLUMN_NAME FK_Column
, RC.UNIQUE_CONSTRAINT_NAME PK_Name
, KP.TABLE_SCHEMA PK_Schema
, RC.MATCH_OPTION MatchOption
, RC.UPDATE_RULE UpdateRule
, RC.DELETE_RULE DeleteRule
from INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS RC
join INFORMATION_SCHEMA.KEY_COLUMN_USAGE KF ON RC.CONSTRAINT_NAME = KF.CONSTRAINT_NAME
join INFORMATION_SCHEMA.KEY_COLUMN_USAGE KP ON RC.UNIQUE_CONSTRAINT_NAME = KP.CONSTRAINT_NAME
where KF.TABLE_NAME + '.' + KF.COLUMN_NAME in
(
    select t.name + '.' + c.name
    from sys.indexes as x,
        sys.index_columns as ic,
        sys.columns as c,
        sys.tables as t,
        sys.schemas as s
    where x.object_id = ic.object_id and
          x.index_id = ic.index_id and
          x.object_id = c.object_id and
          ic.column_id = c.column_id and
          c.object_id = t.object_id and
          t.schema_id = s.schema_id and
          ISNULL(OBJECTPROPERTY(t.object_id, 'IsMSShipped'), 0) = 0 and
          x.is_unique = 1 and
         (
            select count(*) 
            from sys.index_columns ic2
            where ic2.object_id = ic.object_id and
                  ic2.index_id = ic.index_id and
                  ISNULL(OBJECTPROPERTY(ic2.object_id, 'IsMSShipped'), 0) = 0
         ) = 1
)

列出一对一的外键关系

1 个答案: