It seems some of our readers have come across a familiar error message in the sql debug entry line. This issue can occur due to a number of factors. Let’s find out about them below.
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Applies to: sql server (all shipped with editions) Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW)
PRINT msg_str | @local_variable | string_expr
Unicode string or string constant. For more information, see (Transact-SQL) Constants.
Is a variable of any valid dynamic data type. @local_variable must resolve to char, nchar, varchar, or nvarchar, or the following must unmistakably convert to those data types.
If it is a large expression, returns a string. Can include concatenated literals, optionale functions and variables. For more information, see Expressions (Transact-SQL).
A string type message can be up to 8000 characters long if it is a non-Unicode string and up to 4000 characters long if it is a Unicode string. Longer chains are shortened. Data types and topics varchar(max) and nvarchar(max) are truncated to data types no larger than varchar(8000) plus nvarchar(4000).
RAISERROR can also be used for comments. RAISERROR has the following advantages over PRINT:
RAISERROR supports argument substitution for a string error message using a mechanism modeled on the printf event of the C standard library.
RAISERROR can specify a unique error number, severity, and status system to add to a text message.
RAISERROR can be used to create custom messages created using the sp_addmessage stored procedure.
Put Is Executed Conditionally (IF EXISTS)
The following example uses the
IF @@OPTIONS512 & <> 6 PRINT N'This user has enabled SET NOCOUNT.';DIFFERENT PRINT N'This user has disabled SET NOCOUNT.';WALK
B. Create And Display A Very String
The following example converts the results of the
GETDATE function to the best data type
nvarchar and concatenates using literal text separated by
-- builds the message body by concatenation-- Character strings and terms.PRINT N'This message is tagged ' + RTRIM(CAST(GETDATE() AS NVARCHAR(30))) +H'.';WALK-- This level shows the structure of the written message-- is passed in a variable and possibly in PRINT.-- This was required in various versions of SQL Server.0 or earlier.DECLARE @PrintMessage NVARCHAR(50);SET @PrintMessage = N' This message was printed lol + RTRIM(CAST(GETDATE() AS NVARCHAR(30))) + H'. ';PRINT @PrintMessage;WALK
Examples: Azure Synapse Analytics And Analytics Platform System (PDW)
S. Conditional Print Execution
The following example uses the
IF DB_ID() = i PRINT Current n'Database is master.';DIFFERENT PRINT N'Current database neveryes is not the main one.';WALK
See See Also
Using an ORM like Entity Framework can often be helpful to see what's going on "under your hood". If you're debugging or improving the performance of your applications, you need to know how the SQL statements you execute against the database match your appearance. Let's look at some simple implementation examples to help you.
IQueryable And ToString()
If the client wants to see what your LINQ query will look like when converted to SQL, someone just needs to call ToString() on your IQueryable
DbContext.Database.You Are Connecting
If you need more than just seeing what the generated SQL statements look like, you can use DbContext.Database.Log. This will log all SQL statements since the execution of the current DbContext. It also adds runtime information when the instruction appears I'm done.Protect your computer from harmful viruses and malware with this software download.
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