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POAndroid onUpgrade() fails because database is locked, what should I do differently?
 

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  1. POAndroid onUpgrade() fails because database is locked, what should I do differently?
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    <p>I have a project with a set of classes that are responsible for their respective database tables.</p> <p>Each table managing class contains CRUD methods that follow the pattern of get connection, run crud operation, close connection:</p> <pre><code>public class PersonManager { SQLiteDatabase db; DbAdapter dbAdapter; //This is a subclass of SQLiteOpenHelper public void addPerson(Person person) { ContentValues contentValues = new ContentValues(); contentValues.put("email", person.email); contentValues.put("first_name", person.firstName); db = dbAdapter.getWritableDatabase(); db.insert("person", null, contentValues); db.close(); } ...other crud/utility methods omitted... } </code></pre> <p>Now that I am upgrading my database via onUpgrade(), I run into database locked issues.</p> <p>The exact error message follows:</p> <pre><code>CREATE TABLE android_metadata failed Failed to setLocale() when constructing, closing the database android.database.sqlite.SQLiteException: database is locked </code></pre> <p>It appears that onUpgrade is either meant to:</p> <pre><code>1 run db.execSQL() calls or 2 use helper classes that use onUpgrade()'s SQLiteDatabase rather than their own </code></pre> <p>It would be much easier to use my table managing classes to migrate data in onUpgrade() than db.execSQL() statements, or rewrite all my CRUD methods to take onUpgrade()'s SQLiteDatabase.</p> <p>Am I setting up my database access correctly? If the above code follows the correct pattern, what should I do to fix this issue?</p> <p>Thanks!</p>
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    1. COI've encountered this issue before. Just a few questions to help narrow it down, are you doing any threading, and is your SQLiteOpenHelper in this instance a singleton? There should only be one access point (http://stackoverflow.com/a/3689883/429047).
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      1. USMo Kargas
    2. COI have a class that extends SQLiteOpenHelper. I instantiate this class rather than return a static instance. I wasn't sure if it was okay to pass a Context reference to a singleton incase that reference went away. I also open and close the connection on each CRUD method.
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    3. COWhat I don't understand is why it fails on that specific table on Upgrade - android_metadata should exist prior to upgrading. Can you post your onUpgrade method from your helper?
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      1. POAndroid onUpgrade() fails because database is locked, what should I do differently?
      1. USMo Kargas
 

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