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Would like a bit of clarification with SQLite database's onUpgrade method


Would like a bit of clarification with SQLite database's onUpgrade method

By : Peter O'Gorman
Date : November 21 2020, 03:00 PM
will be helpful for those in need
The SQL_CREATE_STRING starts with "CREATE TABLE IF NOT EXISTS", so I'm assuming I could just leave it in the onUpgrade method, correct? Since if it sees the table already it already exists, it wont try to make another one.
code :
public void onUpgrade (SQLiteDatabase db, int oldVersion, int newVersion) {
    for(int i = oldVersion + 1; i < newVersion; i++) {
        switch(i) {
        case 2: upgradeFromv1Tov2(); break;
        case 3: upgradeFromv2Tov3(); break;
        ...
    }
}


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Own SQLite Database and onUpgrade

Own SQLite Database and onUpgrade


By : user3129705
Date : March 29 2020, 07:55 AM
To fix the issue you can do Here is the answer thanks to Joe Masilotti on http://www.reigndesign.com/blog/using-your-own-sqlite-database-in-android-applications/comment-page-2/
code :
private static final int DATABASE_VERSION = 1;
public DataBaseHelper(Context context) {
    super(context, DB_NAME, null, DATABASE_VERSION);
    this.myContext = context;
}
public void createDataBase() throws IOException {
    boolean dbExist = checkDataBase();
    if (dbExist) {
        Log.v(“DB Exists”, “db exists”);
        // By calling this method here onUpgrade will be called on a
        // writeable database, but only if the version number has been
        // bumped
        this.getWritableDatabase();
    }
    dbExist = checkDataBase();
    if (!dbExist) {
        // By calling this method and empty database will be created into
        // the default system path of your application so we are gonna be
        // able to overwrite that database with our database.
        this.getReadableDatabase();
        try {
            copyDataBase();
        } catch (IOException e) {
            throw new Error(“Error copying database”);
        }
    }
}
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    if (newVersion > oldVersion)
        Log.v(“Database Upgrade”, “Database version higher than old.”);
    myContext.deleteDatabase(DB_NAME);
}
How to modify type in a table of SQLite in Android, using onUpgrade method?

How to modify type in a table of SQLite in Android, using onUpgrade method?


By : kaycee
Date : March 29 2020, 07:55 AM
I wish this help you SQLite indeed does not allow changing existing table columns.
However, SQLite uses dynamic typing, so what column type you set in the table definition does not really matter (except for conversions due to type affinity).
code :
CREATE TABLE TempTable (...);
INSERT INTO TempTable SELECT col1, col2, ... FROM MyTable;
DROP TABLE MyTable;
ALTER TABLE TempTable RENAME TO MyTable;
...
INSERT INTO TempTable SELECT CAST(col1 AS TEXT), ... From MyTable;
...
SQLite onUpgrade()

SQLite onUpgrade()


By : Max Kohl
Date : March 29 2020, 07:55 AM
around this issue 1. About onCreate() and onUpdate()
onCreate(..) is called whenever the app is freshly installed. onUpgrade is called whenever the app is upgraded and launched and the database version is not the same.
SQLiteOpenHelper.onUpgrade how does it exactly works? (app with multiple databases)

SQLiteOpenHelper.onUpgrade how does it exactly works? (app with multiple databases)


By : Garikk
Date : March 29 2020, 07:55 AM
this one helps. If you want, you may want to use SQLiteDabase (the first parameter of onUpgrade), with the method getPath to know which databse will be updated.
When you will ask SQLiteOpenHelper.getWritableDatabase (or getReadableDatabase()), it will be updated if the version you set in constructor is greater than the current version of the database.
what is the use of onUpgrade() in sqlite?

what is the use of onUpgrade() in sqlite?


By : Al Nad
Date : March 29 2020, 07:55 AM
I wish did fix the issue. when you change your database table element or column value then you must have to update to data to reflect that change. other wise no such table or other kind of error will occur. so after changing in database if your application is already uploaded then you have to change database version and all the all table recreate in onUpdate() method.
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