Question

I am porting iOS code that works perfectly to the Android OS. I perform a bunch of queries, inserting the results of the queries into a temporary table. When all of the queries are complete I then grab all of the results from the temporary table into a collection of objects of my own creation. I am using a temporary table rather than selecting straight into the collection because I believe it executes more quickly, or at least it does on the iOS side anyways. My problem is that execSQL() is not working as I would expect, here is the code:

db.execSQL("CREATE TEMPORARY TABLE SearchResults(Name text);");
db.execSQL("INSERT INTO SearchResults (Name) SELECT Name FROM ProductNames WHERE NameLower MATCH '" + termLowerCase + "*';");
db.execSQL("INSERT INTO SearchResults (Name) SELECT Name FROM BrandNames WHERE NameLower MATCH '" + termLowerCase + "*';");

When I execute this code I only ever get one row from the first execSQL() call with the INSERT. I know there are more than one result in the ProductNames table that should match my term, and I know there are hundreds of rows in the BrandNames table that should match my term. If I change the code to this:

Cursor cursor = db.rawQuery("SELECT Name FROM ProductNames WHERE NameLower MATCH '" + termLowerCase + "*'", null);
cursor.moveToFirst();
while (!cursor.isAfterLast())
{
    resultSet.add(cursor.getString(0));
    cursor.moveToNext();
}
cursor.close();
cursor = db.rawQuery("SELECT Name FROM BrandNames WHERE NameLower MATCH '" + termLowerCase + "*'", null);
cursor.moveToFirst();
while (!cursor.isAfterLast())
{
    resultSet.add(cursor.getString(0));
    cursor.moveToNext();
}

I get all the results that I’m expecting.

Could anyone tell me what I’m doing wrong? Am I using execSQL() in an inappropriate way? I assumed it would simply pass the query onto sqlite3_exec() which is what I use on iOS. If I am using execSQL() inappropriately what are its limitations and what is the fastest alternative to what I want to do? Thanks very much for any help!

Answer 1

According to the SQLiteDatabase documentation you can not use execSQL in this case. Try doing that statement with rawQuery instead.