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SQLite query using a UUID key
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SnowDrifter  
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 More options Dec 9 2007, 6:22 pm
From: SnowDrifter <amacp...@gmail.com>
Date: Sun, 9 Dec 2007 15:22:58 -0800 (PST)
Local: Sun, Dec 9 2007 6:22 pm
Subject: SQLite query using a UUID key
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I am having some issues getting my database query working since I
changed the primary key from an int to a UUID. I wanted to use a more
unique identifier than an auto incremented int so I chose UUID
(java.util.UUID). My problem, besides being uneducated in SQLite, is
that when I try to query a row I get an error.

This is how I set it up:

UUID locationID = UUID.randomUUID();
ContentValues initialValues = new ContentValues();
initialValues.put("rowid", locationID.toString());
//...other stuff...//
db.insert(DATABASE_TABLE_LOCATIONS, null, initialValues);

Then on a query I do this:

Cursor c =
            db.query(true, DATABASE_TABLE, new String[] {
                "rowid", "stuff", "things"}, "rowid=" + rowId, null,
null, null, null);

The error is occurring on the "rowid=" + rowId part of the call since
I am getting UUID values of "129e3178-2047-416b-8993-b9b2cf9d4f3e" for
instance I think that the query is disliking the "-" values and giving
me an SQLite Exception of:

Unrecognized token: "416b", while compiling SELECT COUNT(*) FROM
(SELECT DISTINCT rowid, stuff, things FROM table WHERE
rowid=129e3178-2047-416b-8993-b9b2cf9d4f3e).

Is there a way to create a where clause that can use that UUID data?
do I need to clean out the "-"'s  to make it work?


 
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Rick Genter  
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 More options Dec 9 2007, 7:06 pm
From: Rick Genter <rick_gen...@comcast.net>
Date: Sun, 9 Dec 2007 16:06:13 -0800
Local: Sun, Dec 9 2007 7:06 pm
Subject: Re: [android-developers] SQLite query using a UUID key
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On Dec 9, 2007, at 3:22 PM, SnowDrifter wrote:

> The error is occurring on the "rowid=" + rowId part of the call since
> I am getting UUID values of "129e3178-2047-416b-8993-b9b2cf9d4f3e" for
> instance I think that the query is disliking the "-" values and giving
> me an SQLite Exception of:

> Unrecognized token: "416b", while compiling SELECT COUNT(*) FROM
> (SELECT DISTINCT rowid, stuff, things FROM table WHERE
> rowid=129e3178-2047-416b-8993-b9b2cf9d4f3e).

> Is there a way to create a where clause that can use that UUID data?
> do I need to clean out the "-"'s  to make it work?

It's a string; you have to quote it. The WHERE clause should read

WHERE rowid = '129e3178-2047-416b-8993-b9b2cf9d4f3e'

--
Rick Genter
rick_gen...@comcast.net


 
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SnowDrifter  
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 More options Dec 9 2007, 9:46 pm
From: SnowDrifter <amacp...@gmail.com>
Date: Sun, 9 Dec 2007 18:46:29 -0800 (PST)
Local: Sun, Dec 9 2007 9:46 pm
Subject: Re: SQLite query using a UUID key
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That did the trick. Thanks for the help.

Just to make this complete, here is what I added to the query:

db.query(true, DATABASE_TABLE, new String[] {
                "rowid", "stuff", "things"}, "rowid='" + rowId + "'",
null, null, null, null);

thats a single quote after the = and I added a single quote in quotes
at the end.

Thanks Rick!

On Dec 9, 5:06 pm, Rick Genter <rick_gen...@comcast.net> wrote:


 
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baker  
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 More options Dec 10 2007, 5:55 am
From: baker <craigbba...@gmail.com>
Date: Mon, 10 Dec 2007 02:55:42 -0800 (PST)
Local: Mon, Dec 10 2007 5:55 am
Subject: Re: SQLite query using a UUID key
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Can I suggest that you might find it helpful to use a sequence based
primary key and add a second column for the UUID. The UUID can then be
used for global identification of the data and the sequence based
primary key can be used for local row based lookups. It all depends on
your applications usage but this is a pattern I have found useful at
times.

Craig.

On Dec 10, 1:46 pm, SnowDrifter <amacp...@gmail.com> wrote:


 
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