I use -[NSPersistentStore metadataForPersistentStoreOfType:URL:error:] for a
variation of the reason stated in its documentation, which is "to retrieve the
metadata from a store without the overhead of creating a Core Data stack.”
Sometimes, although I can’t reproduce it, this method fails. It seems to raise
an exception which writes some stuff to the console, but does not re-throw, so
I never @catch anything :( My code:
if ([[NSFileManager defaultManager] fileExistsAtPath:[url path]]) {
@try {
metadata = [NSPersistentStoreCoordinator
metadataForPersistentStoreOfType:NSSQLiteStoreType
URL:url
error:&underlyingError] ;
}
@catch (NSException* exception) {
// This never happens :(
NSLog(@"Warning 514-0011 for %@ : %@", url, exception) ;
}
}
Furthermore, when that method fails, if I put on my black hat and query the
sqlite file using the sqlite.c library, I get all of the expected metadata with
no problem. I’m thinking of using that in production.
Does anyone know anything else which I should know?
Thanks,
Jerry
More Details…
I want the metadata prior to opening a document, specifically because I
customize what happens when NSDocument fails to open a document due to, for
example, it having been created with a newer version.
This app is built with the 10.9 SDK but I have opted out of WAL journaling for
sqlite, using legacy “rollback” or “delete” journaling.
Here is the call stack which appears when I break in objc_exception_throw:
#0 in objc_exception_throw ()
#1 in -[NSSQLiteConnection prepareSQLStatement:] ()
#2 in -[NSSQLConnection fetchMetadata] ()
#3 in -[NSSQLCore _loadAndSetMetadata] ()
#4 in -[NSSQLCore loadMetadata:] ()
#5 in +[NSSQLCore metadataForPersistentStoreWithURL:error:] ()
#6 in +[NSPersistentStoreCoordinator
metadataForPersistentStoreOfType:URL:error:] ()
#7 in +[MyClass codeYouSeeAbove]
Here is an example of what gets logged to the console:
2014-02-11 14:33:55.030 MyApp[39446:303] CoreData: error: (14) I/O error for
database at /path/to/Document.sql. SQLite error code:14, 'unable to open
database file'
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