At 13:35 -0400 5/1/02, Morris Hirsch wrote:
>The problem is not about your own thread doing several related updates,
>but some other thread doing an INSERT just after you do,
>and before you get a chance to SELECT LAST_INSERT_ID()
>
>If there is any chance of it (anything except a single user can do it)
>you must ensure thread safety with either single-thread attribute,
>or synchronize (this) on the block.
I'll repeat my response to Peter's message:
Not true. LAST_INSERT_ID() guarantees that you get the AUTO_INCREMENT
value generated on your own connection, regardless of what any other
clients are doing.
This assumes that you use <sql:transaction> (as per Shawn's message),
to make sure that the query that generates the AUTO_INCREMENT value
and the query that selects it are issued using the same connection.
>
>On Wed, 1 May 2002, Paul DuBois wrote:
>
>> At 12:56 -0400 5/1/02, Carole E. Mah wrote:
>> >Does anyone know if the JSTL database tags (<sql>) provide any method for
>> >retrieving the unique ID of the row that was inserted last (when you set
>> >up you mySQL database table to AUTO_INCREMENT the unique id).
>> >
>> >This is how I do it using PHP, which provides the mysql_insert_id()
>> >function for just this purpose:
>> >
>> > $query = "INSERT INTO foo (name, phone) VALUES ('Jane Doe','555-1212')";
>> > $LINK = mysql_pconnect ($DB_SERVER, $DB_LOGIN, $DB_PASSWORD);
>> > $result = mysql_db_query ("$DB", $query);
>> > $my_id = mysql_insert_id($LINK);
>> >
>> >Thanks!
>> >
>> >-carole
>>
>> Don't know of any such thing in JSTL, but you can issue this query
>> to get the value from the server:
>>
> > SELECT LAST_INSERT_ID()
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