YZlat
asked on
Function does not return the correct result
I have the following function in my master database:
It checks the table for any complex data types and returns 1 if found any of the specified data types as column type annd returns 0 if nonw were found.
I checked the sql statement separately and it works fine, but now when I call the function from any database on the server as
select master.dbo.udf_IsComplex(' Table_1');
it returns 0 even though Table_1 does contain type image and varchar(max)
can someone point out to me what am I doing wrong?
CREATE FUNCTION [dbo].[udf_IsComplex](@TableName as varchar)
RETURNS BIT
AS
BEGIN
DECLARE @retVal bit;
DECLARE @icount int;
SELECT @icount=COUNT(*)
FROM sys.columns AS c
INNER JOIN sys.objects AS o ON c.object_id=o.object_id
INNER JOIN sys.types AS t ON c.user_type_id=t.user_type_id
WHERE ((t.name IN ('text', 'ntext', 'image', 'xml')) OR (t.name IN ('varchar', 'nvarchar', 'varbinary') AND c.max_length=-1))
and o.name=@TableName;
IF @icount = 0
BEGIN
SET @retVal = 0
END
ELSE
BEGIN
SET @retVal = 1
END
RETURN @retVal
END
It checks the table for any complex data types and returns 1 if found any of the specified data types as column type annd returns 0 if nonw were found.
I checked the sql statement separately and it works fine, but now when I call the function from any database on the server as
select master.dbo.udf_IsComplex('
it returns 0 even though Table_1 does contain type image and varchar(max)
can someone point out to me what am I doing wrong?
ASKER CERTIFIED SOLUTION
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Easiest might be to create the function in every db in which it will be used.
The function below allows, but does not require, the schema name to precede the table name.
CREATE FUNCTION [dbo].[udf_IsComplex] (
@TableName AS varchar(257)
)
RETURNS bit
AS
--Sample uses:
-- SELECT dbo.udf_IsComplex('tablena me')
-- SELECT dbo.udf_IsComplex('schema2 .tablename ')
BEGIN
RETURN (
SELECT CASE WHEN EXISTS(SELECT 1
FROM sys.columns AS c
INNER JOIN sys.objects AS o ON c.object_id=o.object_id
INNER JOIN sys.types AS t ON c.user_type_id=t.user_type _id
WHERE ((t.name IN ('text', 'ntext', 'image', 'xml')) OR
(t.name IN ('varchar', 'nvarchar', 'varbinary') AND c.max_length=-1))
AND o.schema_id = (SELECT schema_id FROM sys.schemas s WHERE name=ISNULL(PARSENAME(@Tab leName, 2), 'dbo'))
AND o.name=PARSENAME(@TableNam e, 1)
) THEN 1 ELSE 0 END
)
END
The function below allows, but does not require, the schema name to precede the table name.
CREATE FUNCTION [dbo].[udf_IsComplex] (
@TableName AS varchar(257)
)
RETURNS bit
AS
--Sample uses:
-- SELECT dbo.udf_IsComplex('tablena
-- SELECT dbo.udf_IsComplex('schema2
BEGIN
RETURN (
SELECT CASE WHEN EXISTS(SELECT 1
FROM sys.columns AS c
INNER JOIN sys.objects AS o ON c.object_id=o.object_id
INNER JOIN sys.types AS t ON c.user_type_id=t.user_type
WHERE ((t.name IN ('text', 'ntext', 'image', 'xml')) OR
(t.name IN ('varchar', 'nvarchar', 'varbinary') AND c.max_length=-1))
AND o.schema_id = (SELECT schema_id FROM sys.schemas s WHERE name=ISNULL(PARSENAME(@Tab
AND o.name=PARSENAME(@TableNam
) THEN 1 ELSE 0 END
)
END
ASKER
aneeshattingal, I changed it to varchar(100) but still returns 0
ASKER
The thing is i'd like to use this function as a part of dynamic SQL that runs for each database on the server
You can't use dynamic SQL in a function. Naturally you can use dynamic SQL to invoke the function from within each db, although the function would have to exist in every db from which it's to be called/invoked.
I don't know of any way to have a function residing in one db to dynamically reference different dbs depending on how it's called, other than hard-coding each db name and using checks in the code to only run it for the db name/pattern passed in, and you may not want to do that.
I don't know of any way to have a function residing in one db to dynamically reference different dbs depending on how it's called, other than hard-coding each db name and using checks in the code to only run it for the db name/pattern passed in, and you may not want to do that.
ASKER
ScottPletcher, that's exactly what i am trying to do - use the function within my dynamic sql
ASKER
Here is my full dynamic SQL that calls IsComplex function:
WHILE @i <= @maxI
BEGIN
SET @SQL = ''
print @i
SELECT @SQL = @SQL + CASE WHEN LEN(@SQL) > 7500 THEN '' ELSE CHAR(13) + 'USE ' + QUOTENAME([name]) + ';
SELECT ' +quotename([name],'''') + ' as DatabaseName,
SchemaName=ss.name,
TableName= OBJECT_NAME (ps.object_id),
IndexName=i.name,
[FragPercent]=ps.avg_fragmentation_in_percent,
IsComplex=udf_IsComplex(OBJECT_NAME (ps.object_id)),
[ActionTaken]=CASE WHEN ps.avg_fragmentation_in_percent > 30 THEN ' + quotename('Rebuild','''') +
' ELSE ' + quotename('Reoraganize','''') + ' END
FROM sys.dm_db_index_physical_stats(ISNULL(DB_ID(' + quotename([name],'''') + '),0),NULL, NULL, NULL, ' + quotename('DETAILED','''') + ') as ps
INNER JOIN sys.indexes as i ON ps.[object_id] = i.[object_id] AND ps.index_id = i.index_id
INNER JOIN sys.objects as o ON ps.object_id = o.object_id
INNER JOIN sys.schemas as ss ON ss.[schema_id] = o.[schema_id]
WHERE i.index_id != 0
AND ps.database_id IN(SELECT database_id FROM sys.databases WHERE state_desc=' + quotename('ONLINE','''') + ')
AND ps.avg_fragmentation_in_percent > 5; ' END
FROM sys.databases
WHERE database_id = @i
AND state_desc='ONLINE'
AND compatibility_level > 80
SELECT @SQL
INSERT ##IndexFragmentation
EXECUTE sp_executesql @SQL
-- increment loop counter
SELECT @i = MIN(database_id)
FROM sys.databases
WHERE database_id > @i
AND state_desc='ONLINE'
AND compatibility_level > 80
END
" i'd like to use this function as a part of dynamic SQL that runs for each database on the server"
then put it into the Model and it'll appear as you create new databases. Put it now into each database that already exists. Then call it from whereever you happen to be.
You can use a batch over different databases; you could use a procedure that switched from database to database (get the list from master.sys.databases into a table in a user database), running your code and storing the results into a table ...
hth
Mike
then put it into the Model and it'll appear as you create new databases. Put it now into each database that already exists. Then call it from whereever you happen to be.
You can use a batch over different databases; you could use a procedure that switched from database to database (get the list from master.sys.databases into a table in a user database), running your code and storing the results into a table ...
hth
Mike
ASKER
I would like to avoid doing that and keep it in the master database. is that possible?
if not, is there a better way to find out if each table selected in the select above contains complex data type or not?
if not, is there a better way to find out if each table selected in the select above contains complex data type or not?
>> is that possible? <<
Not AFAIK.
>> is there a better way to find out if each table selected in the select above contains complex data type or not? <<
Not that I can think of right now. A function would seem to be the preferred method.
Not AFAIK.
>> is there a better way to find out if each table selected in the select above contains complex data type or not? <<
Not that I can think of right now. A function would seem to be the preferred method.
ASKER
I think i came up with something:
I will dynamically loop through each database and use somethin glike that to retrieve necessary data:
I will dynamically loop through each database and use somethin glike that to retrieve necessary data:
SELECT 'DBName' as DatabaseName,
SchemaName=ss.name,
TableName= OBJECT_NAME (ps.object_id),
IndexName=i.name,
[FragPercent]=ps.avg_fragmentation_in_percent,
IsComplex=(SELECT COUNT(*)
FROM sys.columns AS c1
INNER JOIN sys.objects AS o1 ON c1.object_id=o1.object_id
INNER JOIN sys.types AS t1 ON c1.user_type_id=t1.user_type_id
WHERE ((t1.name IN ('text', 'ntext', 'image', 'xml')) OR (t1.name IN ('varchar', 'nvarchar', 'varbinary') AND c1.max_length=-1)) AND o1.Name =OBJECT_NAME (ps.object_id)),
[ActionTaken]=CASE WHEN ps.avg_fragmentation_in_percent > 30 THEN 'Rebuild'
ELSE 'Reorganize' END
FROM sys.dm_db_index_physical_stats(ISNULL(DB_ID(' + quotename([name],'''') + '),0),NULL, NULL, NULL, 'DETAILED') as ps
INNER JOIN sys.indexes as i ON ps.[object_id] = i.[object_id] AND ps.index_id = i.index_id
INNER JOIN sys.objects as o ON ps.object_id = o.object_id
INNER JOIN sys.schemas as ss ON ss.[schema_id] = o.[schema_id]
WHERE i.index_id != 0
AND ps.database_id IN(SELECT database_id FROM sys.databases WHERE state_desc='ONLINE')
AND ps.avg_fragmentation_in_percent > 5;
"I would like to avoid doing that and keep it in the master database. is that possible?"
I don't believe so.
However, you can write code that reaches out to each database after getting a list of the databases from master.sys.databases.
In this code you could interrogate the "local" sys.objects and other tables, as you do currently, to determine your answer.
It would certainly be a somewhat complicated piece of dynamic SQL, and you would have to keep the results in a static table somewhere.
So yes, it would be possible, but it'll take a a few hours to write and test, whereas putting the (working) function into Model and then cycling through the databases running the function inside a piece of code would probably be lots simpler to write.
Your choice!
hth
Mike
I don't believe so.
However, you can write code that reaches out to each database after getting a list of the databases from master.sys.databases.
In this code you could interrogate the "local" sys.objects and other tables, as you do currently, to determine your answer.
It would certainly be a somewhat complicated piece of dynamic SQL, and you would have to keep the results in a static table somewhere.
So yes, it would be possible, but it'll take a a few hours to write and test, whereas putting the (working) function into Model and then cycling through the databases running the function inside a piece of code would probably be lots simpler to write.
Your choice!
hth
Mike
the input parameter is accepting only 1 character , change it to varchar(100)