SSIS Variable which holds query result is empty

Question

The following code is used in execute sql task. Result set is set to single row. There is one input parameter. Result is set to a single row. The result is saved into a variable. it is called CreateSQLscript. The problem is that variable is empty. It does not show any value, though input parameter correctly changes values, Can anyone tell me why my result is empty ? Can anyone help me to fix this issue please? This is the code I used in execute sql task.

    -- Insert statements for procedure here
    DECLARE
     @object_name SYSNAME
   ,   @object_id INT
   ,  @SQL VARCHAR(8000)
   , @SourceTable varchar(8000)= ?

SELECT
      @object_name = '[' + OBJECT_SCHEMA_NAME(o.[object_id]) + '].[' + OBJECT_NAME([object_id]) + ']'
    , @object_id = [object_id]
FROM (SELECT [object_id] = OBJECT_ID(''+@SourceTable+'', 'U')) o

SELECT
      @object_name = '[' + OBJECT_SCHEMA_NAME(o.[object_id]) + '].[' + OBJECT_NAME([object_id]) + ']'
    , @object_id = [object_id]
FROM (SELECT [object_id] = OBJECT_ID(''+@SourceTable+'', 'U')) o

SELECT @SQL = 'CREATE TABLE ' + @object_name + CHAR(13) + '(' + CHAR(13) + STUFF((
    SELECT CHAR(13) + '    , [' + c.name + '] ' +
        CASE WHEN c.is_computed = 1
            THEN 'AS ' + OBJECT_DEFINITION(c.[object_id], c.column_id)
            ELSE
                CASE WHEN c.system_type_id != c.user_type_id
                    THEN '[' + SCHEMA_NAME(tp.[schema_id]) + '].[' + tp.name + ']'
                    ELSE '[' + UPPER(tp.name) + ']'
                END  +
                CASE
                    WHEN tp.name IN ('varchar', 'char', 'varbinary', 'binary')
                        THEN '(' + CASE WHEN c.max_length = -1
                                        THEN 'MAX'
                                        ELSE CAST(c.max_length AS VARCHAR(5))
                                    END + ')'
                    WHEN tp.name IN ('nvarchar', 'nchar')
                        THEN '(' + CASE WHEN c.max_length = -1
                                        THEN 'MAX'
                                        ELSE CAST(c.max_length / 2 AS VARCHAR(5))
                                    END + ')'
                    WHEN tp.name IN ('datetime2', 'time2', 'datetimeoffset')
                        THEN '(' + CAST(c.scale AS VARCHAR(5)) + ')'
                    WHEN tp.name = 'decimal'
                        THEN '(' + CAST(c.[precision] AS VARCHAR(5)) + ',' + CAST(c.scale AS VARCHAR(5)) + ')'
                    ELSE ''
                END +
                CASE WHEN c.collation_name IS NOT NULL AND c.system_type_id = c.user_type_id
                    THEN ' COLLATE ' + c.collation_name
                    ELSE ''
                END +
                CASE WHEN c.is_nullable = 1
                    THEN ' NULL'
                    ELSE ' NOT NULL'
                END +
                CASE WHEN c.default_object_id != 0
                    THEN ' CONSTRAINT [' + OBJECT_NAME(c.default_object_id) + ']' +
                         ' DEFAULT ' + OBJECT_DEFINITION(c.default_object_id)
                    ELSE ''
                END +
                CASE WHEN cc.[object_id] IS NOT NULL
                    THEN ' CONSTRAINT [' + cc.name + '] CHECK ' + cc.[definition]
                    ELSE ''
                END +
                CASE WHEN c.is_identity = 1
                    THEN ' IDENTITY(' + CAST(IDENTITYPROPERTY(c.[object_id], 'SeedValue') AS VARCHAR(5)) + ',' +
                                    CAST(IDENTITYPROPERTY(c.[object_id], 'IncrementValue') AS VARCHAR(5)) + ')'
                    ELSE ''
                END
        END
    FROM sys.columns c WITH(NOLOCK)
    JOIN sys.types tp WITH(NOLOCK) ON c.user_type_id = tp.user_type_id
    LEFT JOIN sys.check_constraints cc WITH(NOLOCK)
         ON c.[object_id] = cc.parent_object_id
        AND cc.parent_column_id = c.column_id
    WHERE c.[object_id] = @object_id
    ORDER BY c.column_id
    FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 7, '      ') +
    ISNULL((SELECT '
    , CONSTRAINT [' + i.name + '] PRIMARY KEY ' +
    CASE WHEN i.index_id = 1
        THEN 'CLUSTERED'
        ELSE 'NONCLUSTERED'
    END +' (' + (
    SELECT STUFF(CAST((
        SELECT ', [' + COL_NAME(ic.[object_id], ic.column_id) + ']' +
                CASE WHEN ic.is_descending_key = 1
                    THEN ' DESC'
                    ELSE ''
                END
        FROM sys.index_columns ic WITH(NOLOCK)
        WHERE i.[object_id] = ic.[object_id]
            AND i.index_id = ic.index_id
        FOR XML PATH(N''), TYPE) AS NVARCHAR(MAX)), 1, 2, '')) + ')'
    FROM sys.indexes i WITH(NOLOCK)
    WHERE i.[object_id] = @object_id
        AND i.is_primary_key = 1), '') + CHAR(13) + ');'

---SET @Result =  @SQL
---PRINT @Result
SELECT @SQL

when I run the same query (hardcoded) in management studio, I get the following result.

This is the package.

This is the general setting of execute sql task. ( create sql script)

This is the input parameters.

The query result is saved in this variable.

When I use the hardcoded code, CreateSQLScript variable, shows the value. that means it holds the query result. It looks like Create table part of the query is causing the problem. I am not sure how to fix this.

Answer 1

I found why it is empty. I have connected the execute sql task to a wrong database where the table does not exist. That is why the result is empty. Now I connected to the correct database. Now it works fine.