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Is `cmd.CommandType = CommandType.StoredProcedure;` Necessary When Executing Stored Procedures in C#?
Is `cmd.CommandType = CommandType.StoredProcedure;` Necessary When Executing Stored Procedures in C#?
Dec 21, 2024 am 07:14 AM
Setting CommandType on SQL Commands: StoredProcedure vs. Text
When utilizing stored procedures in C#, it's common to encounter code like the following:
string sql = "GetClientDefaults";
SqlCommand cmd = new SqlCommand(sql);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@computerName", computerName);
However, the question arises: Is the line cmd.CommandType = CommandType.StoredProcedure; necessary, and what are the potential implications of not using it?
Performance Considerations
According to performance tests, SQL Server performs parameterization regardless of whether you use CommandType.Text or CommandType.StoredProcedure. However, when using CommandType.StoredProcedure, the parameterization is done more efficiently by SQL Server. This results in a speed advantage for using CommandType.StoredProcedure.
Parameter Declarations
When using CommandType.Text, it's crucial to include the parameter names in the CommandText itself. This is because the sp_executesql wrapper, which is used by SQL Server to parameterize the statement, doesn't automatically pass the parameter names. Therefore, you must manually specify them to ensure proper execution.
For example, if you create a procedure like this:
create procedure dbo.Test ( @Text1 varchar(10) = 'Default1' ,@Text2 varchar(10) = 'Default2' ) as begin select @Text1 as Text1, @Text2 as Text2 end
And then call it using CommandType.Text, you must include the parameter names in the CommandText:
string callText = "dbo.Test @Text1, @Text2";
Otherwise, you will encounter an error indicating that the specified parameter was not supplied.
Conclusion
In summary:
- For optimal performance, use CommandType.StoredProcedure when executing stored procedures.
- When using CommandType.Text, be mindful of parameter declaration in the CommandText.
The above is the detailed content of Is `cmd.CommandType = CommandType.StoredProcedure;` Necessary When Executing Stored Procedures in C#?. For more information, please follow other related articles on the PHP Chinese website!
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