Why can't DBD::SQLite insert into a database through my Perl CGI script?
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I am running a SQLite database within a Perl CGI script which is being accessed by DBD::SQLite. This is being run as a straight CGI on Apache.
The DBI connection works fine and selects are able to be run. However, when I attempt to do an insert I get a die with the following error:
DBD::SQLite::st execute failed: unable to open database file(1) at dbdimp.c line 402 at index.cgi line 66
I have tried changing the database file permission to 666 to try to fix this however I am still receiving the error.
It looks like the directory needs write permission, the reason is:
SQLite needs to be able to create a journal file in the same directory as the DB, before any modifications can take place. The journal is used to support transaction rollback.
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SQLite momentarily locks the entire file when it is doing inserts and updates (there is no record-level locking as such). Are you sure you're freeing the locks?
The SQLite literature recommends that you start a transaction, collect all of your inserts and updates du jour in that transaction, and then commit. This avoids numerous successive file locks, and improves performance.
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Since SQLite locks the entire database file, you may want to use a timeout-based retry mechanism. I was working on pretty much the same problem when I asked this related question.
I ended up writing something similar to Mark Fowler's Attempt that retries if the exception thrown by the sub matches a regular expression, in my case:
qr(already in a transaction|database is locked)i
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If you don't want to set write permissions on the whole directory as explained in Todd Hunter's answer, you could instead set the
journal_mode PRAGMA to "MEMORY".
In that case, beware that:
The MEMORY journaling mode stores the rollback journal in volatile RAM. This saves disk I/O but at the expense of database safety and integrity. If the application using SQLite crashes in the middle of a transaction when the MEMORY journaling mode is set, then the database file will very likely go corrupt.
So whether this is a good solution depends on your database and how it is used.
Others also mention the temp_store pragma. I didn't need to set that, but it may depend on how the database is used.
So in your Perl CGI script, you could try this:
$dbh->do("PRAGMA journal_mode = MEMORY"); $dbh->do("PRAGMA temp_store = MEMORY");
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- Can you set the directory and file permission temporarily to 777 and recheck it?
- Ah ha! Changing the directory permissions to 777 fixed this. Do you know why this is?
- You probably forgot to set the right directory permission too.