Dynamic SQL in my stored procedure fails with an undeclared variable (@time_val). How can I resolve this?
DECLARE @time_val DATETIME = GETDATE();
DECLARE @sql_stmt NVARCHAR(MAX) = N'SELECT TOP 1 @flag = 1 FROM db_example.schemaB.MyTable WHERE record_date < @time_val';
DECLARE @flag BIT = 0;
EXEC sp_executesql @sql_stmt, N'@flag BIT OUTPUT, @time_val DATETIME', @flag OUTPUT, @time_val = @time_val;
PRINT @flag;
The issue arises because the dynamic SQL statement does not inherently recognize variables declared in the outer scope unless they are explicitly passed in through sp_executesql. When working with dynamic SQL, you must declare every external variable within the parameter definition string and then assign a value to it at execution. This approach ensures that the SQL engine knows about the variable and can obtain its value. I encountered similar issues in past projects and found that careful parameter management is essential to avoid such errors in dynamic SQL.
hey, seems like your dynamic sql isnt recogning the var cuz its not correctly pssed. you gotta specfy it in the sp_executesql parrameter string to ensure it passes through properly. hope this helps.
hey there, i think you need to pass the value directly, coz the dynamic sql wont pick it up. maybe check the parameter binding and names for consistency? curious if other vars could be misbehaving too. any more insights?
In a similar situation, I resolved my dynamic SQL issues by ensuring that every parameter used inside the executed statement was explicitly declared in the parameter definition string, and that their names and data types exactly matched those used outside. Reviewing the parameter string carefully was crucial to avoid any mismatches which could lead to failures like the one described. This method not only fixed the immediate problem but also enhanced the overall clarity and maintainability of the code by enforcing strict parameter control when executing dynamic SQL.