Error in SQL script: Only one statement is allowed per batch

sql

best-practices

tools

project-settings

byAlex Kataev·Sep 18, 2024

To quickly solve the "Only one statement is allowed per batch" error, segment your SQL script into distinct batches using GO. In SQL Server, GO signals the end of a batch and the start of another, enabling multiple SQL statements to be executed in sequence.

-- First batch: Create a stored procedure
-- This procedure is so stored, it's like your family's secret recipe!
CREATE PROCEDURE YourProcedure AS
BEGIN
  -- SQL code 
END
GO

-- Second batch: Execute the stored procedure
-- It's showtime!
EXEC YourProcedure
GO

Use GO post each independent operation to sidestep batch errors. Note, different databases have unique ways to execute multiple statements; GO is a SQL Server champ.

Checking project settings in Visual Studio

The culprit of the notorious "Only one statement is allowed per batch" error in a development setting like Visual Studio isn't always SQL syntax. It might well be the project configuration. Make sure to configure your PostDeployment scripts as <None Include>, not <Build Include> in the .sqlproj file.

Reviewing and tweaking file properties

In Visual Studio, ensure all SQL script files maintain consistent file properties. Particularly, set the Build Action property to None to kill the error:

Right-click on the SQL script file.
March over to Properties.
Set Build Action to None. No building allowed here!

Ensuring project-wide consistency

Big emphasis on consistency here. Maintain these settings across all SQL scripts within your project to prevent any compilation tantrums:

When adding new files, ensure you make the correct declarations.
Revisit older files as changes to one could spur changes in others.
Misconfigurations or oversights carry the potential to trigger unwanted errors during project compilation.

Settings matter: Misconfiguration can lead to issues

The misalignment of SQL scripts in the project .sqlproj file can spawn compilation errors. A deep dive into the project file coupled with a review of sql script properties can hunt down discrepancies causing the error.

Paying attention to project detail

While adding or configuring SQL scripts in Visual Studio:

Be smart while manipulating properties like Build Action and Copy to Output Directory.
Exercise caution while fiddling with PostDeployment scripts.
The lure to use GO should be ignored if the error is configuration-oriented.

Building the right project, the right way

Forming a habit of scrutinizing project-level details shields you from hours of debugging and unwanted errors. It fosters a healthier SQL scripting environment. In less typical cases,

A refactoring of the codebase can improve block's organization
Breaking complex scripts down into simpler, more digestible ones.
Utilizing resources like online communities about your development environment can provide unorthodox solutions.

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