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1058553
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CreationDate
2009-06-29T14:15:33.437
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2013-09-21T11:54:07.213
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2013-09-21T11:54:07.213
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35440
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989558
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2
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28
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text
Body
<p>The answer from Just Curious is dead-on (you got my point!), and it's what we use to track the version of the database schema that is currently in the app.</p> <p>To run through the migrations that need to occur to get user_version matching the app's expected schema version, we use a switch statement. Here's a cut-up example of what this look like in our app <a href="http://getstrip.com" rel="noreferrer">Strip</a>:</p> <pre><code>- (void) migrateToSchemaFromVersion:(NSInteger)fromVersion toVersion:(NSInteger)toVersion { // allow migrations to fall thru switch cases to do a complete run // start with current version + 1 [self beginTransaction]; switch (fromVersion + 1) { case 3: // change pin type to mode 'pin' for keyboard handling changes // removing types from previous schema sqlite3_exec(db, "DELETE FROM types;", NULL, NULL, NULL); NSLog(@"installing current types"); [self loadInitialData]; case 4: //adds support for recent view tracking sqlite3_exec(db, "ALTER TABLE entries ADD COLUMN touched_at TEXT;", NULL, NULL, NULL); case 5: { sqlite3_exec(db, "ALTER TABLE categories ADD COLUMN image TEXT;", NULL, NULL, NULL); sqlite3_exec(db, "ALTER TABLE categories ADD COLUMN entry_count INTEGER;", NULL, NULL, NULL); sqlite3_exec(db, "CREATE INDEX IF NOT EXISTS categories_id_idx ON categories(id);", NULL, NULL, NULL); sqlite3_exec(db, "CREATE INDEX IF NOT EXISTS categories_name_id ON categories(name);", NULL, NULL, NULL); sqlite3_exec(db, "CREATE INDEX IF NOT EXISTS entries_id_idx ON entries(id);", NULL, NULL, NULL); // etc... } } [self setSchemaVersion]; [self endTransaction]; } </code></pre>
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1. POBest practices for in-app database migration for Sqlite
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1. USTomas Andrle
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1. USBilly Gray
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