从整行存储数据，Android SQLite

Question

So I have a method that allows me to get the id of a certain item by using a name i already have in an SQL Database. How would I go about getting the entire row of information and storing each item in its own variable.

Method that only works with ID

public Cursor getID(String name){
    SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
    String query = " SELECT " + COL1 + " FROM " + TABLE_NAME + " WHERE " + COL2 + " = '" + name + "'";
    Cursor data = sqLiteDatabase.rawQuery(query, null);
    return data;
}

And the method that gets the query and stores the result

Cursor data = mydb2.getID(name);
            int itemId= -1;
            while(data.moveToNext()){
                itemId = data.getInt(0);
            }

Using this method below how would i store all of the data in its own variable using this (or any other way to get data of entire row).

public Cursor rowData(String name){
    SQLiteDatabase sqLiteDatabase = this.getWritableDatabase();
    String query = " SELECT * FROM " + TABLE_NAME + " WHERE " + COL2 + " = '" + name + "'";
    Cursor data = sqLiteDatabase.rawQuery(query, null);
    return data;
}

I know this might be a dumb question, and I have tried looking at other questions, I have gotten this far I just don't know what to do next (I'm very new to Sq Lite databases and Android development)

Answer 1

You'd use something like :-

    Cursor csr = instance_of_yourdbhelper.rowData();
    while(csr.moveToNext()) {
        long thisItemId = csr.getLong(csr.getColumnIndex(yourdbhelper.COL_1));
        String thisName = csr.getString(csr.getColumnIndex(yourdbhelper.COL_2));
        // etc for other columns
    }

Notes

• yourdbhelper is the class for your DatabaseHelper which is the class that extends SQLiteOpenHelper (the assumption is that the above methods are from such a class, as this is a common usage of SQLite)

• instance_of_yourdbhelper is the instance of the DatabaseHelper class ie you may have yourdbhelper dbhlpr = new yourdbhelper(parameters); , in which case dbhlpr is the instance.

• This just overwrites the same variables (thisItemId and thisName) for each row in the cursor, although there is perhaps the likliehood that the rowData method only returns one row.

• You will likely encounter fewer errors using the getColumnIndex method as it returns the offset according to the column name. Miscalculated offsets is a frequent cause of problems.

• You may wish to handle a no rows returned situation in which case you can use cursor.getCount() , which will return the number of rows in the cursor.