Question

I’m trying to check to see if a table exists in and SQLite Database with Android using this in my SQLiteOpenHelper file

// Check to see if a table exists
public boolean isTableExists(String tblName) {
    String existQuery = "SELECT name FROM sqlite_master WHERE name ='" + tblName + "' and type='table'";
    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(existQuery, null);

    if(cursor != null){
        cursor.close();
        return true;
    }

    return false;

}

The call from my Activity is

if(db.isTableExists("characters") == false){
        Intent p = new Intent("com.tml.rpgtodo.CREATECHARACTER");
        startActivity(p);
    }

I keep getting a NullPointerException on the row with the if statement. What am I doing wrong?

Answer 1

It sounds like db is null when you call if(db.isTableExists("characters") == false).

I also see that you initialize db inside of “isTableExists()”. Is that a different “db”?