> At 23:19 +0000 3/4/03, Mamatha Balasubramanian wrote: >>Thank you once again. >> >>I have a web-interface that does search on a given text and I would >> have a script that creates a temporary table. So according to you, in >> my script, I just to need >>create a temporary table and not have to worry about another client >> using the same web interface (and thereby using the same program). Can >> you please elaborate a little more on this? > > Sure. > > You are incorrect. :-) > > That is, you're making an assumption that cannot necessarily be made. If > you can guarantee that the web script will establish a new connection, > and the connection will terminate when the script ends, you can indeed > do what you describe above. > > But you *cannot* do that if you're running your script in an environment > that uses persistent connections that may be used by successive > instances of the script. PHP persistent connections fall into this > class, for example. Several requests might be served by the same > instance of the web server process, and you don't know that one request > won't be getting the connection used by a previous request. In that > case, the connection won't have closed, and the TEMPORARY table won't > have disappeared. > > You can guard against this by issuing this query before creating the > TEMPORARY table: > > DROP TABLE IF EXISTS tbl_name > > >> >>Thanks, >>Mamatha Probably even better to have the Drop Table at the end of the script that used it. >> >> >> >>>From: Paul DuBois <[EMAIL PROTECTED]> >>>To: "Mamatha Balasubramanian" >>><[EMAIL PROTECTED]>,[EMAIL PROTECTED] >>>Subject: Re: Temporary Tables >>>Date: Tue, 4 Mar 2003 17:06:30 -0600 >>> >>>At 23:00 +0000 3/4/03, Mamatha Balasubramanian wrote: >>>>Hi, >>>>I would like to know how MySQL handles multiple temporary tables? >>>> >>>>1. Can multiple temporary tables be created at the same time? >>>>2. If so, how does MySQL differentiate them - do we need to >>>>explicitly give them different names inorder to identify them or >>>> does MySQL provide a timestamp (or use some other means) to >>>>identify the tables? >>> >>>You can create multiple temporary tables, but they must have different >>> names. >>> >>>A TEMPORARY table can have the same name as a non-TEMPORARY table. The >>> non-TEMPORARY table is hidden to the client that creates the TEMPORARY >>> table as long as the TEMPORARY table exists. >>>A second TEMPORARY table with the same name cannot be created. >>> >>>This is on a connection-specific basis. Two clients each can create a >>> TEMPORARY table with the same name. Only the table created by a given >>> client is visible to that client. >>> >>>> >>>>I use MySQL 4.0.7 on Red Hat. >>>> >>>>Thanks, >>>>Mamatha > >
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