sql-server-2008r2-express - 使用光标删除所有同义词

Question

我想使用游标删除数据库（sql server 2008 r2）的所有同义词。environment-database name-'mydatabase'，schema name-'dbo'..你能像我尝试的那样指导我吗，但是while .. end的语句不能删除同义词。什么逻辑应该应用 wrt 游标？

Answer 1

无需使用游标。按照设置执行：

declare @n char(1)
set @n = char(10)

declare @stmt nvarchar(max)

select @stmt = isnull( @stmt + @n, '' ) +
'drop synonym [' + SCHEMA_NAME(schema_id) + '].[' + name + ']'
from sys.synonyms

exec sp_executesql @stmt

Answer 2

Similar to Jason's answer with some improvements

• Use Quotename() function to wrap the names in square brackets
• Initialize the @SQL variable to an empty string, this means that the isnull is not required, and means that when you concatenate the results of the query into a single string it doesn't get the type wrong. String literals in a concatenation can take the default nvarchar size and cause your resulting string to be truncated unexpectedly.
• Ensure the string literals are also nvarchar by using the N in front of them.
• Filter to the dbo schema only, as the OP requested.
• Add the sys schema to the sp_executesql call

Totally agree this is not something where you need a cursor.

DECLARE @SQL NVARCHAR(MAX) = N''
SELECT @SQL += N'DROP SYNONYM ' + QUOTENAME(SCHEMA_NAME([schema_id])) + N'.' + QUOTENAME(name) + N';' + Char(13) + Char(10)
FROM sys.synonyms
WHERE SCHEMA_NAME([schema_id]) = N'dbo'

EXEC sys.sp_executesql @SQL