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PODB Wrapper Not Responding to Message?
 

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  1. PODB Wrapper Not Responding to Message?
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    <p>I'm developing for iphone-sdk 2.2.1 (so no CoreData <em>cry</em>). </p> <p>So I'm using the <a href="http://code.google.com/p/flycode/source/browse/trunk/fmdb/src/FMDatabase.h" rel="nofollow noreferrer">FMDatabase project</a>, which is just a SQLite Wrapper in Obj C. I have my DB working well when interacting with it from my AppDelegate. I've tested connecting, INSERTING, etc from the AppDelegate. </p> <p>Now, I have a data object that I want to store into the Database. I would like this event to occur from a ViewController class. Lets see some code:</p> <p>App Delegate Creates the DB in the applicationDidFinishLaunching method. The DB is declared as a property of this class so I can easily access it.</p> <pre><code>db = [FMDatabase databaseWithPath:[self getDBPath]]; </code></pre> <p>This works fine, I have tested it. The only thing I'm a little concerned about is 'db' being a property of the class. That shouldn't cause problems, should it?</p> <p>From the same applicationDidFinishLaunching method, I've tested that a simple insert works using. This Works:</p> <pre><code>[db beginTransaction]; [db executeUpdate:@"INSERT INTO tblDataSamples (...) VALUES (...);"]; [db commit]; </code></pre> <p>Now, if I simply take this exact code and move it to an instance method of the AppDelegate, the code no longer works. I get a <code>"EXC_BAD_ACCESS"</code> error when we hit the [db beginTransaction] line.</p> <p>The flow of this code to this call: - AltViewController Receives a button tap Event - AltViewController tells ApplicationDelegate to execute the "addSample" method. - ApplicationDelegate's addSample method fails on [db beginTransaction].</p> <p>Now that I've written this out, I am thinking the problem is that my DB gets lost after the ApplicationDelegate loads the RootView. Maybe I'm wrong though. Anyone have any ideas?</p> <p>!!!!!!!!!</p> <p><strong>UPDATE!</strong> <em>I just altered my addSample method to include</em> </p> <pre><code>db = [FMDatabase databaseWithPath:[self getDBPath]]; if (![db open]) { NSLog(@"Could not open db."); } </code></pre> <p>and</p> <pre><code>[db close]; </code></pre> <p>The entire transaction works now. So, the new question is: how do I make the database open ONCE and stay open across different views and viewControllers?</p>
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    1. USBuffalo
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    1. COIt may be easier to just use the Sqlite3 API. It's really simple and concise. You could easily create object wrappers/conveniences for the functions you actually use.
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      1. USJason Coco
    2. COEither use db = [[FMDatabase databaseWithPath...] retain] or [self setDb:[FMDatabase databaseWithPath...]] where db is set as a property with a "retain" attribute
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      1. USlostInTransit
 

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