Dynamic SQL for Dynamic Filtering
Dynamic Filtering is a method in SQL Server dynamic query to filter data for different filter conditions dynamically for the same SQL query. The Filter condition could be an user input received from the front-end and passed to a dynamic query.
Example of Dynamic Filtering
Create Procedure spFilterStudentData
@strStudentName nvarchar(100)
As
Begin
Declare @SqlQuery nvarchar(1000)
Set @SqlQuery= 'Select * from Students where Student_Name =' + CHAR(39) + @strStudentName + CHAR(39)
Exec(@SqlQuery)
End
This stored procedure can be run using the below execution command:
EXEC spFilterStudentData 'Ramesh'
Output:
Dynamic Filtering
Explanation: In the above example, the Student Name is filtered dynamically using a stored procedure with dynamic SQL to create the filter dynamically. When the stored procedure is executed with ‘Ramesh‘ as filter data, the above result is displayed from the ‘Students‘ table.
Dynamic SQL in SQL Server
In SQL Server, at times the SQL Queries need to be dynamic and not static, meaning the complete SQL query may be built dynamically at run time as a string using the user inputs and any specific application logic. This can be done in queries run from back-end applications or inside stored procedures. In this article let us look into the details about how to create a dynamic SQL and its uses and also what are the security issues that may arise and how to handle those security issues.
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