php try catch does not catch database error

#Php try catch does not catch database error code#

throw:- It is a keyword, that is used to throw an exception.

There can be multiples catch blocks with 1 (one) try block.

A try block should have a minimum of one catch block.The try block should be followed by a catch or finally block.The following points must be noted concerning the try:

#Php try catch does not catch database error code#

It contains the block of code in which an exception can occur. Therefore, each try block should have a minimum of one catch block. An exception raised in the try block throughout runtime is caught by the catch block. try:- The try block consists of the block of code that may contain an exception.The reason this behavior has caught my attention originally, is that there looks to be something special about this particular exception: there are other “more severe” situations, like missing procedure altogether, that are still perfectly trappable in the TRY. –INSERT my_local_db.dbo.my_local_table( field_1, field_2, field_3) INSERT my_local_db.dbo.my_local_table( field_1, field_2, field_3)ĮXEC MY_LINKED_SERVER.the_db.dbo.the_proc ‘20140718’ (none of the four ways listed below traps the exception) If a linked server is not involved though, the same exception is perfectly trappableīelow are the examples of the non-trappable “Column name or number of supplied values does not match table definition.” exceptions: There also look to be some catch with regards to using linked server queries in the TRY…CATCH constructįor example, the exception below is not trappable inside the TRY…CATCH if a linked server is involved:Ĭolumn name or number of supplied values does not match table definition.

Until then, whenever I’ll run into a problem, I’ll need to repeat the backup command manually in SSMS and hope for the failing condition to be consistent enough for me to be able to reproduce the problem. This is a real problem, and I am still looking for a proper way around it. Relevant backup error messages are being concealed when using ERROR_MESSAGE() in a TRY/CATCH block. I could enumerate dozens of random circumstances which could cause a backup to fail… none of which will be visible in the CATCH block, meaning none will be properly logged, nor properly handled. That is the error message that would have helped me quickly understand the nature of the problem. Operating system error 5(Access is denied.). The concealed underlying error message, the only one that really mattered, was the following:Ĭannot open backup device ‘(filepath ame)’. But the calling procedure’s TRY/CATCH block which was responsible for logging errors would only record “BACKUP DATABASE is terminating abnormally” as an ERROR_MESSAGE(), which didn’t provide much insight into the source of the problem. The backup operation was failing because of an underlying NTFS permission issue. Just like Davide, I ran into a similar issue where I was performing a backup on a server where the backup path had been altered. I actually see Davide’s example as a very good way to simulate the issue, in the same manner as I sometimes deliberately put a “1/0” in a VIEW to provoke an error and test my error handling code. Regardless of the reason _why_ the database would be in single_user mode, it illustrates a real problem where a relevant reason for failure is being hidden. WAITFOR DELAY '00:00:10' -pause to hopefully avoid deadlock next batchĮLSE - some other error or done = ERROR_MESSAGE() IF ERROR_NUMBER() = 1205 AND < - 1205 is the deadlock error SET NOCOUNT int = 1, tinyint = 0, tinyint = nvarchar(4000), int, int My favorite usage of a TRY/CATCH construct is when you are purging data and retrying the DELETE due to a deadlock:ĬREATE PROC usp_Table2_Purge datetime, int = 5000) In all of these cases, be sure that the calling application/object handles the error.

Errors that occur during statement-level recompilation (object existence errors fall into this category).

In addition to the above, there are some errors that are not handled when it occurs at the same level as the TRY/CATCH:

Errors that have a severity of 20 or higher that stop the session.

Warnings or informational messages that have a severity of 10 or lower.

I suppose I’ll be saying Books Online for quite some time too. Are we even calling it Books Online these days? I still say “bookmark lookup” instead of “key lookup”.

It’s well documented in Books Online (BOL). We were once asked in class what TRY/CATCH doesn’t handle besides object existence errors.