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Dynamic SQL for dedicated SQL pools in Azure Synapse Analytics

  • Artikkeli

Included in this article are tips for development solutions using dynamic SQL in dedicated SQL pools.

Dynamic SQL example

When developing application code for dedicated SQL pools, you may need to use dynamic SQL to help deliver flexible, generic, and modular solutions. Dedicated SQL pools don't support blob data types at this time.

Not supporting blob data types might limit the size of your strings since blob data types include both varchar(max) and nvarchar(max) types.

If you've used these types in your application code to build large strings, you need to break the code into chunks and use the EXEC statement instead.

A simple example:

DECLARE @sql_fragment1 VARCHAR(8000)=' SELECT name '
,       @sql_fragment2 VARCHAR(8000)=' FROM sys.system_views '
,       @sql_fragment3 VARCHAR(8000)=' WHERE name like ''%table%''';

EXEC( @sql_fragment1 + @sql_fragment2 + @sql_fragment3);

If the string is short, you can use sp_executesql as normal.

Note

Statements executed as dynamic SQL will still be subject to all T-SQL validation rules.

Next steps

For more development tips, see development overview.