SQL Server:如何知道是否有任何行引用要删除的行

Question

如果任何行引用要通过FK删除的行,则无法删除行.

在执行DELETE语句之前,是否可以知道是否有任何行引用要删除的行？

Answer 1

此脚本将显示所有具有引用您要删除的行的行的表:

declare @RowId int = 1
declare @TableName sysname = 'ParentTable'

declare @Command varchar(max) 

select @Command = isnull(@Command + ' union all ', '') + 'select ''' + object_name(parent_object_id) + 
    ''' where exists(select * from ' + object_name(parent_object_id) + ' where ' + col.name+ ' = ' + cast(@RowId as varchar) + ')' 
from sys.foreign_key_columns fkc
    join sys.columns col on
        fkc.parent_object_id = col.object_id and fkc.parent_column_id = col.column_id
where object_name(referenced_object_id) = @TableName

execute (@Command)

假设外键不是复合的.