Re: Temporary table lifespan - SOLVED
Jerry Schwartz wrote: Possibly you are opening another connection, using the same handle, when you re-enter your script. If that is the case, you'll lose track of your previous connection (the one that has the temporary table). You might also be accumulating a lot of connections, if this recursion happens multiple levels. Regards, Jerry Schwartz Global Information Incorporated 195 Farmington Ave. Farmington, CT 06032 860.674.8796 / FAX: 860.674.8341 -Original Message- From: Amer Neely [mailto:[EMAIL PROTECTED] Sent: Thursday, February 15, 2007 11:21 PM To: Daniel Kasak; mysql@lists.mysql.com Subject: Re: Temporary table lifespan - SOLVED Amer Neely wrote: Daniel Kasak wrote: Amer Neely wrote: OK, that makes sense. As far as I know, my connection is still live - I don't do a disconnect anywhere. So I'm still not sure why I can't pull the data back out. I do get an error telling me about a problem with my statement near which is where it tries to execute the FROM command. My apologies, I'm not on the computer that I am developing this script on, so can't give you the exact error. I'm naming the table from a purchase order number, and as far as I can tell, the table I try to read from is the same as the one I created - but I get nothing out of it. It's hard to say without more details. You can send the script if you want. Also keep in mind that since you're using tmp tables which are invisible to all other connections, you don't need to much around with creating a unique table name - you can just use a generic one ( eg tmp_purchase_order or something ). I'll try something like that tomorrow. Thanks for the responses. I'll post my results. After failing to get the temporary table method working, I ended up just creating a table, then dropping it when I was done. It seems that a temporary table will get deleted when a script calls itself and jumps to a function inside. That must constitute a disconnection. I checked my code, and one of the first things the script does is connect to the database. So you're right, it starts a new connection. I couldn't figure an easy way around that - kind of like the horse / cart thingy, so went the route I did with just dropping a table after processing. Works fine. -- Amer Neely w: www.softouch.on.ca/ b: www.softouch.on.ca/blog/ v: 705.223.3539 Perl | MySQL programming for all data entry forms. We make web sites work! -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
RE: Temporary table lifespan - SOLVED
Possibly you are opening another connection, using the same handle, when you re-enter your script. If that is the case, you'll lose track of your previous connection (the one that has the temporary table). You might also be accumulating a lot of connections, if this recursion happens multiple levels. Regards, Jerry Schwartz Global Information Incorporated 195 Farmington Ave. Farmington, CT 06032 860.674.8796 / FAX: 860.674.8341 -Original Message- From: Amer Neely [mailto:[EMAIL PROTECTED] Sent: Thursday, February 15, 2007 11:21 PM To: Daniel Kasak; mysql@lists.mysql.com Subject: Re: Temporary table lifespan - SOLVED Amer Neely wrote: Daniel Kasak wrote: Amer Neely wrote: OK, that makes sense. As far as I know, my connection is still live - I don't do a disconnect anywhere. So I'm still not sure why I can't pull the data back out. I do get an error telling me about a problem with my statement near which is where it tries to execute the FROM command. My apologies, I'm not on the computer that I am developing this script on, so can't give you the exact error. I'm naming the table from a purchase order number, and as far as I can tell, the table I try to read from is the same as the one I created - but I get nothing out of it. It's hard to say without more details. You can send the script if you want. Also keep in mind that since you're using tmp tables which are invisible to all other connections, you don't need to much around with creating a unique table name - you can just use a generic one ( eg tmp_purchase_order or something ). I'll try something like that tomorrow. Thanks for the responses. I'll post my results. After failing to get the temporary table method working, I ended up just creating a table, then dropping it when I was done. It seems that a temporary table will get deleted when a script calls itself and jumps to a function inside. That must constitute a disconnection. -- Amer Neely w: www.softouch.on.ca/ b: www.softouch.on.ca/blog/ Perl | MySQL programming for all data entry forms. We make web sites work! -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Temporary table lifespan
I'm writing a perl script in which I need to save some session data. My first attempt is to use a temporary table to store some data. However, I'm a little unclear as to the lifespan of the temporary table. My understanding is they last until the session ends, or a DELETE TABLE is issued. My question is 'what is a session'? For example, in my perl script I create and populate the table in one subroutine, but need to access it from another in the same script. But it doesn't appear to live through the transition from one subroutine to another. Anyone have an idea whether this can even be done, or does calling another subroutine end the 'session', thus killing the table? -- Amer Neely w: www.softouch.on.ca/ b: www.softouch.on.ca/blog/ Perl | MySQL programming for all data entry forms. We make web sites work! -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Temporary table lifespan
Amer Neely wrote: I'm writing a perl script in which I need to save some session data. My first attempt is to use a temporary table to store some data. However, I'm a little unclear as to the lifespan of the temporary table. My understanding is they last until the session ends, or a DELETE TABLE is issued. My question is 'what is a session'? For example, in my perl script I create and populate the table in one subroutine, but need to access it from another in the same script. But it doesn't appear to live through the transition from one subroutine to another. Anyone have an idea whether this can even be done, or does calling another subroutine end the 'session', thus killing the table? Session isn't exactly the right word for it. The temporary tables hang around for the lifetime of the database connection. So if you open a database connection, make a tmp table, close the DB connection, and open another one ( inside the same subroutine ), your tmp table will be gone. Also, if you open 2 DB connections, and make a tmp table from one, the other connection can't see it. So just keep your DB connection ( or database handle in Perl speak ) live and you should be able to see the table. -- Daniel Kasak IT Developer NUS Consulting Group Level 5, 77 Pacific Highway North Sydney, NSW, Australia 2060 T: (+61) 2 9922-7676 / F: (+61) 2 9922 7989 email: [EMAIL PROTECTED] website: http://www.nusconsulting.com.au -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Temporary table lifespan
Amer Neely wrote: Daniel Kasak wrote: Amer Neely wrote: I'm writing a perl script in which I need to save some session data. My first attempt is to use a temporary table to store some data. However, I'm a little unclear as to the lifespan of the temporary table. My understanding is they last until the session ends, or a DELETE TABLE is issued. My question is 'what is a session'? For example, in my perl script I create and populate the table in one subroutine, but need to access it from another in the same script. But it doesn't appear to live through the transition from one subroutine to another. Anyone have an idea whether this can even be done, or does calling another subroutine end the 'session', thus killing the table? Session isn't exactly the right word for it. The temporary tables hang around for the lifetime of the database connection. So if you open a database connection, make a tmp table, close the DB connection, and open another one ( inside the same subroutine ), your tmp table will be gone. Also, if you open 2 DB connections, and make a tmp table from one, the other connection can't see it. So just keep your DB connection ( or database handle in Perl speak ) live and you should be able to see the table. OK, that makes sense. As far as I know, my connection is still live - I don't do a disconnect anywhere. So I'm still not sure why I can't pull the data back out. I do get an error telling me about a problem with my statement near which is where it tries to execute the FROM command. My apologies, I'm not on the computer that I am developing this script on, so can't give you the exact error. I'm naming the table from a purchase order number, and as far as I can tell, the table I try to read from is the same as the one I created - but I get nothing out of it. -- Amer Neely w: www.softouch.on.ca/ b: www.softouch.on.ca/blog/ Perl | MySQL programming for all data entry forms. We make web sites work! -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Temporary table lifespan
Amer Neely wrote: OK, that makes sense. As far as I know, my connection is still live - I don't do a disconnect anywhere. So I'm still not sure why I can't pull the data back out. I do get an error telling me about a problem with my statement near which is where it tries to execute the FROM command. My apologies, I'm not on the computer that I am developing this script on, so can't give you the exact error. I'm naming the table from a purchase order number, and as far as I can tell, the table I try to read from is the same as the one I created - but I get nothing out of it. It's hard to say without more details. You can send the script if you want. Also keep in mind that since you're using tmp tables which are invisible to all other connections, you don't need to much around with creating a unique table name - you can just use a generic one ( eg tmp_purchase_order or something ). -- Daniel Kasak IT Developer NUS Consulting Group Level 5, 77 Pacific Highway North Sydney, NSW, Australia 2060 T: (+61) 2 9922-7676 / F: (+61) 2 9922 7989 email: [EMAIL PROTECTED] website: http://www.nusconsulting.com.au -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Temporary table lifespan
Daniel Kasak wrote: Amer Neely wrote: OK, that makes sense. As far as I know, my connection is still live - I don't do a disconnect anywhere. So I'm still not sure why I can't pull the data back out. I do get an error telling me about a problem with my statement near which is where it tries to execute the FROM command. My apologies, I'm not on the computer that I am developing this script on, so can't give you the exact error. I'm naming the table from a purchase order number, and as far as I can tell, the table I try to read from is the same as the one I created - but I get nothing out of it. It's hard to say without more details. You can send the script if you want. Also keep in mind that since you're using tmp tables which are invisible to all other connections, you don't need to much around with creating a unique table name - you can just use a generic one ( eg tmp_purchase_order or something ). I'll try something like that tomorrow. Thanks for the responses. I'll post my results. -- Amer Neely w: www.softouch.on.ca/ b: www.softouch.on.ca/blog/ Perl | MySQL programming for all data entry forms. We make web sites work! -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Temporary table lifespan - SOLVED
Amer Neely wrote: Daniel Kasak wrote: Amer Neely wrote: OK, that makes sense. As far as I know, my connection is still live - I don't do a disconnect anywhere. So I'm still not sure why I can't pull the data back out. I do get an error telling me about a problem with my statement near which is where it tries to execute the FROM command. My apologies, I'm not on the computer that I am developing this script on, so can't give you the exact error. I'm naming the table from a purchase order number, and as far as I can tell, the table I try to read from is the same as the one I created - but I get nothing out of it. It's hard to say without more details. You can send the script if you want. Also keep in mind that since you're using tmp tables which are invisible to all other connections, you don't need to much around with creating a unique table name - you can just use a generic one ( eg tmp_purchase_order or something ). I'll try something like that tomorrow. Thanks for the responses. I'll post my results. After failing to get the temporary table method working, I ended up just creating a table, then dropping it when I was done. It seems that a temporary table will get deleted when a script calls itself and jumps to a function inside. That must constitute a disconnection. -- Amer Neely w: www.softouch.on.ca/ b: www.softouch.on.ca/blog/ Perl | MySQL programming for all data entry forms. We make web sites work! -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
