Delete all tables from sqlite database

Question

I have done a lot of research and was unable to find a suitable method to delete all the tables in an SQLite database. Finally, I did a code to get all table names from the

Answer 1

Tim Biegeleisen's answer almost worked for me, but because I used AUTOINCREMENT primary keys in my tables, there was a table called sqlite_sequence. SQLite would crash when the routine tried to drop that table. I couldn't catch the exception either. Looking at https://www.sqlite.org/fileformat.html#internal_schema_objects, I learned that there could be several of these internal schema tables that I shouldn't drop. The documentation says that any of these tables have names beginning with sqlite_ so I wrote this method

private void dropAllUserTables(SQLiteDatabase db) {
    Cursor cursor = db.rawQuery("SELECT name FROM sqlite_master WHERE type='table'", null);
    //noinspection TryFinallyCanBeTryWithResources not available with API < 19
    try {
        List<String> tables = new ArrayList<>(cursor.getCount());

        while (cursor.moveToNext()) {
            tables.add(cursor.getString(0));
        }

        for (String table : tables) {
            if (table.startsWith("sqlite_")) {
                continue;
            }
            db.execSQL("DROP TABLE IF EXISTS " + table);
            Log.v(LOG_TAG, "Dropped table " + table);
        }
    } finally {
        cursor.close();
    }
}

Answer 2

For me, the working solution is:

    Cursor c = db.rawQuery(
            "SELECT name FROM sqlite_master WHERE type IS 'table'" +
                    " AND name NOT IN ('sqlite_master', 'sqlite_sequence')",
            null
    );
    if(c.moveToFirst()){
        do{
            db.execSQL("DROP TABLE " + c.getString(c.getColumnIndex("name")));
        }while(c.moveToNext());
    }

Answer 3

Use DROP TABLE:

// query to obtain the names of all tables in your database
Cursor c = db.rawQuery("SELECT name FROM sqlite_master WHERE type='table'", null);
List<String> tables = new ArrayList<>();

// iterate over the result set, adding every table name to a list
while (c.moveToNext()) {
    tables.add(c.getString(0));
}

// call DROP TABLE on every table name
for (String table : tables) {
    String dropQuery = "DROP TABLE IF EXISTS " + table;
    db.execSQL(dropQuery);
}

Answer 4

delete database instead of deleting tables and then create new with same name if you need. use following code

context.deleteDatabase(DATABASE_NAME); 
          or
context.deleteDatabase(path);