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No output, but SSMS error (no indication of error in SQLCMD): To further illustrate this point, the following example shows text that should definitely return errors, even if PARSEONLY is enabled, yet does not error: The client skipped that set of statements and moved on to the next batch of statements. This time there’s no parse error because the batch of statements was never sent to SQL Server for processing. ("Query completed with errors." in bottom status bar of SSMS) (no "Results" tab "Messages" tab is empty) Now, let’s execute the same query batch that we tried a moment ago that received a parse error due to the undeclared variable, but this time we will add a "0" to the GO : Returns the following 1 in the "Messages" tab: If you haven’t tried this before, adding a positive integer after the batch separator will send the preceding batch of statements to SQL Server that many times: Now we finally get to play with batch repetition. But, parsing errors cannot be avoided as parsing cannot be disabled.īut first, let’s confirm that batch separators are handled by client tools and not SQL Server by placing the typical one in dynamic SQL:
Sql batch script example code#
There aren’t even any compilation errors as the code isn’t being compiled either. Must declare the scalar variable are no runtime errors as the code is not being executed. SELECT NoSuchColumn FROM sys.objects - compilation error If there are parsing errors (syntax errors, undeclared variables, etc), those will still be reported, even if processing ends at the completion of this phase due to PARSEONLY being set to ON. In the following example, there is no output because PARSEONLY is set to ON within the batch: It can be at the beginning, middle, or end, and it doesn’t matter: the batch is being parsed no matter what. This means that the location of the SET PARSEONLY statement within the batch is irrelevant since this setting controls whether or not to proceed to the next step / phase of the execution process. PARSEONLY is a session setting that is processed at parse time, prior to compilation (and execution, of course). Tests Reviewįirst let’s review what PARSEONLY ON does. Why does this list of SQL Server clients matter? Well, due to GO being processed by the clients instead of SQL Server, there is the possibility of there being different behavior between the various clients. not ODBC) replacement for sqlcmd that I wrote: Simple SQL Exec. GO is also recognized by many 3rd party utilities, including an open source, lightweight ADO.NET-based (i.e. GO is not a Transact-SQL statement it is a command recognized by the sqlcmd and osql utilities and SQL Server Management Studio Code editor.Īpparently that list has not been updated to include: Visual Studio, Visual Studio Code, and Azure Data Studio. There are two things in particular that are of importance: syntax and where applicable. Let’s take a look at the documentation to see what the behavior is supposed to be: There are some statements that require being the only statement in a batch, such as CREATE PROCEDURE and CREATE VIEW, in which case GO will be used (assuming that you will be running the whole script in one execution and not merely highlighting each section to execute individually, in which case GO isn’t needed). Some people put GO between most statements and that really isn’t necessary. Anyone who works with SQL Server and has submitted queries via client tools such as SQL Server Management Studio (SSMS), sqlcmd, and others has used GO to separate batches of query statements. What is this mysterious “technique”, you ask? Well, it’s none other than everyone’s favorite batch separator: GO. However, this “technique” is more limited than PARSEONLY as it only works on individual batches, and it only works in some environments. I found a way to fully disable an entire T-SQL batch, and there really isn’t any indication that it happened. Then one day I tried something silly that I figured wouldn’t work but wanted to try anyway (because quite often you don’t know until you know), and it actually did work (for the most part).
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This means that you could still see parsing errors related to undeclared variables, syntax errors, etc. It will still be parsed by SQL Server as that is not something that can be turned off. But in either case, “disabling” doesn’t mean that the script, or section of code, will be skipped entirely as if it wasn’t there.
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That same method can be used to disable one or more sections within a script instead of the entire script.
Sql batch script example how to#
In a previous post, Prevent Full Script Execution (Understanding and Using PARSEONLY and NOEXEC), I explained how to easily disable a script using the PARSEONLY session setting.