[sqlite] Re: execution of select
Hannes Ricklefs [EMAIL PROTECTED] wrote: I am wondering at what stage the actual SQL gets executed. Is that the first call to step? or does the sql get executed for each step call? I'm not sure what you mean by executed. Prepare generates an execution plan. With each call to step, this execution plan is carried out until one row is available. I am thinking that the average call to step should be the same no matter how big the database is?! I guess this depends on how you define the set you are averaging over. Even within the same database, time taken by a call to step may vary widely. Consider: select * from table; You get the records from table in no particular order. Every step call will take approximately the same time, independent of the size of the table. select * from table order by someField; Assuming there is no index on someField, this query requires retrieving all records from table into memory and sorting them there before the first row can be produced. As a result, the first step can take a long time, proportional to NlogN where N is the number of records, whereas subsequent steps are fast. Igor Tandetnik
Re: [sqlite] sqlite3_close()
Ok, thanks. I'm pretty new to this kind of thing so I appreciate the feedback. joe John Stanton wrote: Try calling sqlite3_finalize on the prepared statements before sqlite3_close. Joe Halpin wrote: One of the return values from sqlite3_close() is SQLITE_BUSY. The examples I've seen so far all exit after calling this function and don't check the return value. I need to be able to close and reopen the database without exiting, but I'm not sure what to do if I get SQLITE_BUSY as the return from sqlite3_close(). Should I wait and try again until I get SQLITE_OK or SQLITE_ERROR? Thanks Joe
Re: [sqlite] Book recommendation
El Miércoles, 9 de Noviembre de 2005 14:21, Joe Halpin escribió: I'm looking for a good tutorial (online or paper) to help me get the concepts behind using the C/C++ API. Could anyone recommend the book by Chris Newman SQLite: A practical guide to using, administering and programming the database bundled with PHP5? I'm looking primarily to use the API rather than the command line tool. Thanks Joe It's a good book. Get the paperback edition, unless you are using Windows and want to save money. There is no Acrobat reader for ebooks on Linux. Regards. -- Alfredo J. Cole Grupo ACyC
Re: [sqlite] Book recommendation
On 11/10/05, Joe Halpin [EMAIL PROTECTED] wrote: I'm looking for a good tutorial (online or paper) to help me get the concepts behind using the C/C++ API. Could anyone recommend the book by Chris Newman SQLite: A practical guide to using, administering and programming the database bundled with PHP5? I'm looking primarily to use the API rather than the command line tool. Thanks Joe Any links for it? -- Firman Wandayandi Never Dreamt Before: http://firman.dotgeek.org/ Wishlist: http://www.amazon.com/gp/registry/1AAN8NZBHW2W9
Re: [sqlite] Book recommendation
I'm 99% certain this book covers the sqlite v2 C/C++ API. Which is similar, but not exactly the same as v3 (the current). The other APIs it covers, TCL and PHP, I think are still pretty much the same. That said the book is pretty readable. --- Joe Halpin [EMAIL PROTECTED] wrote: I'm looking for a good tutorial (online or paper) to help me get the concepts behind using the C/C++ API. Could anyone recommend the book by Chris Newman SQLite: A practical guide to using, administering and programming the database bundled with PHP5? I'm looking primarily to use the API rather than the command line tool. Thanks Joe __ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com
