我有一个存储过程，当前正在使用嵌套游标使用数据库，表，列参数建立视图。我需要将其更改为while循环查询。我知道结果是相同的，但我们只是不想使用游标。
由于动态SQL，这似乎非常棘手。
ALTER PROCEDURE [dbo].[spReCreateCommonViews_AK]
AS
DECLARE @Exec INT = 1, @Print INT = 2
-- DECLARE @debug INT = @Exec
DECLARE @debug INT = @Print
DECLARE @Sql VARCHAR(MAX),
@SourceName VARCHAR(100),
@DatabaseName VARCHAR(100),
@CompanyName VARCHAR(100),
@ColumnCursor VARCHAR(800),
@TableId INT,
@TableName VARCHAR(100),
@ColumnType INT,
@ColumnName VARCHAR(100),
@ColumnList VARCHAR(MAX) = '',
@CreateViewSQL VARCHAR(MAX)
/** COMPANIES ********/
DECLARE CompaniesCursor CURSOR FOR
SELECT
[Database],
REPLACE(REPLACE(REPLACE([Name], '.', '_'), '/', '_'), '''', '_') AS [Name],
CASE
WHEN RIGHT([Source], 7) = '_SOURCE'
THEN '[' + [Source] + '].[' + [Database] + ']'
ELSE '[' + [Database] + ']'
END AS [Source]
FROM
Company
OPEN CompaniesCursor
FETCH NEXT FROM CompaniesCursor INTO @DatabaseName, @CompanyName, @SourceName
WHILE @@fetch_status = 0
BEGIN
/** TABLES ***********/
SELECT @Sql = 'DECLARE TablesCursor CURSOR FOR
select
o.[id] as TableId,
o.[name] as TableName
from '+@SourceName+'.dbo.sysobjects o
inner join '+@SourceName+'.dbo.[Object] t
on o.[name] = replace(replace(replace(t.[Name],''.'',''_''),''/'',''_''),'''''''',''_'')
and t.[Company Name] = ''''
and t.[Type] = 0
where o.[name] <> ''Company''
and o.[name] not like ''' + @CompanyName + '$%''
and o.type = ''U''
order by o.[name]
'
exec(@Sql)
open TablesCursor
fetch next from TablesCursor into @TableId, @TableName
while @@fetch_status = 0
begin
/** COLUMNS ************************************************************/
select @ColumnCursor =
'
declare ColumnsCursor cursor
for
select ''['' + [name] + '']'' as ColumnName, xtype as ColumnType
from '+@SourceName+'.dbo.syscolumns
where [id] = ' + convert(varchar, @TableId) + '
order by colid
'
exec(@ColumnCursor)
open ColumnsCursor
fetch next from ColumnsCursor into @ColumnName, @ColumnType
while @@fetch_status = 0
begin
select @ColumnList = @ColumnList + @ColumnName + case when @ColumnType in (35, 99, 167, 175, 231, 239) then ' collate database_default as ' + @ColumnName + ', ' else ', ' end
-----------------------------
fetch next from ColumnsCursor into @ColumnName, @ColumnType
end
close ColumnsCursor
deallocate ColumnsCursor
-----------------------------
select @CreateViewSQL= 'if object_id(N'''+@CompanyName+'$' + @TableName + ''', N''V'') is not null drop view ['+@CompanyName+'$' + @TableName + ']'
if @debug & @Print = @Print print(@CreateViewSQL)
if @debug & @Exec = @Exec exec (@CreateViewSQL)
select @CreateViewSQL= 'create view ['+@CompanyName+'$' + @TableName + '] as select ' + left(@ColumnList,len(@ColumnList)-1) + ' from ' + @SourceName + '.dbo.[' + @TableName + ']'
if @debug & @Print = @Print print(@CreateViewSQL)
if @debug & @Exec = @Exec exec (@CreateViewSQL)
select @ColumnList = ''
-----------------------------
fetch next from TablesCursor into @TableId, @TableName
end
close TablesCursor
deallocate TablesCursor
------------------------------
select @Sql = '
insert into [Object] (
[Type],
[Company Name],
[ID],
[Name],
[Modified],
[Compiled],
[BLOB Reference],
[BLOB Size],
[DBM Table No_],
[Date],
[Time],
[Version List]
)
select
o.[Type],
'''+@CompanyName+''' as [Company Name],
o.[ID],
o.[Name] collate database_default,
o.[Modified],
o.[Compiled],
o.[BLOB Reference],
o.[BLOB Size],
o.[DBM Table No_],
o.[Date],
o.[Time],
o.[Version List] collate database_default
from '+@SourceName+'.dbo.Object o
where o.[Name] <> ''Company''
and o.[Company Name] = ''''
and o.[Type] = 0
and not exists (
select c.*
from [Object] c
where c.[Name] = o.[Name] collate database_default
and c.[Company Name] = '''+@CompanyName+'''
and c.[Type] = 0
and c.[ID] = o.[ID]
)
'
if @debug & @Print = @Print
print(@Sql)
if @debug & @Exec = @Exec
exec (@Sql)
-----------------------------
fetch next from CompaniesCursor into @DatabaseName, @CompanyName, @SourceName
end
close CompaniesCursor
deallocate CompaniesCursor
-----------------------------