Issue executing Dynamic sql query - sql

Question

I have a SQL set of instructions that I want to execute across multiple databases. I currently have the following SQL code:
USE Database1
DECLARE #mySourceTable AS [someUserDefinedType];
/*Execute set of operations on Database 1 and #mySourceTable*/
DECLARE #dbList TABLE (DBName nvarchar(50));
INSERT INTO #dbList (DBName)
VALUES('Database2'),('Database3');
DECLARE #dbName nvarchar(50);
DECLARE dbCursor CURSOR FOR SELECT DBName FROM #dbList;
OPEN dbCursor;
FETCH NEXT FROM dbCursor INTO #dbName;
WHILE ##FETCH_STATUS = 0
BEGIN
EXECUTE('USE ' + #dbName + N';
DECLARE #content AS [someUserDefinedType];
INSERT INTO #content (ID)
SELECT ID FROM '+ #mySourceTable + N';
EXECUTE dbo.someProcedure #content;');
FETCH NEXT FROM dbCursor INTO #dbName;
END;
CLOSE dbCursor;
DEALLOCATE dbCursor;
Basically I want to do the following: I have several databases that all have the same [someUserDefinedType] table type (with the same structure) and a procedure named dbo.someProcedure that receives as a parameter a table of said type (the dbo.someProcedure is not the same across databases, it is specific to each). I want to go through the list of provided databases (#dbList) and execute each stored procedure with data from #mySourceTable. I am not sure if the code above is the best approach, it does not work and gives the error:
Must declare the scalar variable "#mySourceTable".
This variable is already declared at the beginning of the script. What am I doing wrong? Is it possible to pass the data from #mySourceTable using a variable and not create another table for it (I really want to avoid that)?

Answer 1

Try something like this:
USE Database1
DECLARE #mySourceTable AS [someUserDefinedType];
/*Execute set of operations on Database 1 and #mySourceTable*/
DECLARE #dbList TABLE (DBName nvarchar(50));
INSERT INTO #dbList (DBName)
VALUES('Database2'),('Database3');
DECLARE #dbName nvarchar(50);
DECLARE dbCursor CURSOR FOR SELECT DBName FROM #dbList;
OPEN dbCursor;
FETCH NEXT FROM dbCursor INTO #dbName;
DECLARE #DynamicTSQLStatement NVARCHAR(MAX);
WHILE ##FETCH_STATUS = 0
BEGIN
SET #DynamicTSQLStatement = N'
USE ' + #dbName + ';
DECLARE #content AS [someUserDefinedType];
INSERT INTO #content (ID)
SELECT ID FROM #mySourceTable;
EXECUTE dbo.someProcedure #content;';
FETCH NEXT FROM dbCursor INTO #dbName;
EXEC sp_executesql #DynamicTSQLStatement, N'#mySourceTable someUserDefinedType readonly', #mySourceTable = #mySourceTable
END;
CLOSE dbCursor;
DEALLOCATE dbCursor;
When you are executing T-SQL statement with sp_executesql you can pass parameters.