android cannt use data function in query

Question

I cant get any result if i put "date('now', 'localtime')" in the query.

My original code is:

Cursor record = db.query(RECORD_TABLE, null, date(UTC_DATETIME,'localtime') = ? ",
            new String[]{"date('now', 'localtime')"},null,null,null);

It doesn't return any result.

But I can get result if I use:

Cursor record = db.query(RECORD_TABLE,null, date(UTC_DATETIME,'localtime') = ? ",
            new String[]{"2014-05-13"},null,null,null);

Is there a way that I can use "date('now', 'localtime')" in my query?

Answer 1

The whole point of parameters is to prevent their values from being interpreted as SQL expressions.

To call an SQL function, you have to put it into the SQL string:

Cursor record = db.query(RECORD_TABLE, null,
        "date(UTC_DATETIME,'localtime') = date('now', 'localtime')",
        null,null,null,null);

Please note that the localtime conversion affects both values in the same way, so you can omit it:

Cursor record = db.query(RECORD_TABLE, null,
        "date(UTC_DATETIME) = date('now')",
        null,null,null,null);

or even omit the first date call if the UTC_DATETIME column alread is in the correct yyyy-MM-dd format:

Cursor record = db.query(RECORD_TABLE, null,
        "UTC_DATETIME = date('now')",
        null,null,null,null);