Re: [sqlite] charindex function
Greg Obleshchuk wrote: how do I get [my function] placed into the original source? Print the copyright release at http://www.sqlite.org/cpywrtrls.html Sign it and mail me a copy. After I have your release on file, you will be permitted to contribute code. D. Richard Hipp 6200 Maple Cove Lane Charlotte, NC 28269 USA -- D. Richard Hipp -- [EMAIL PROTECTED] -- 704.948.4565 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [sqlite] SQL92
>Hello, >Does anyone have a web link to a document that details SQL92. > >regards >Greg O For that matter, I would like to see a link to the details of SQL99, or whatever the newest SQL standard is. I sorta need it, but my previous searches haven't worked... -- Darren Duncan - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [sqlite] Performance problem
On Thu, 2003-11-06 at 19:00, [EMAIL PROTECTED] wrote: > How would you handle the lack of ordering associate with hash tables? > Sqlite can currently use indicies for three main tests: equals, less than, > and greater than. While hash-tables are good at finding equal-to in > constant time it usually means linear time (a table-scan) to test for less > than or greater than. Do you have a solution to this problem? You presume that a defining characteristic of a hash-table is that the function be non-linear. Consider a n->3 bit function: f(x) -> x mod 8 A very linear function that it is perfectly easy to iterate _in_order_ all values of the table. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [sqlite] database table is locked
- Forwarded by Ben Carlyle/AU/IRSA/Rail on 07/11/2003 10:03 AM - Ben Carlyle 07/11/2003 10:03 AM To: Thiago Mello <[EMAIL PROTECTED]>@CORP cc: Subject:Re: [sqlite] database table is locked Thiago Mello <[EMAIL PROTECTED]> 08/11/2003 09:00 AM To: [EMAIL PROTECTED] cc: Subject:[sqlite] database table is locked > Im doing a SELECT sql query, and in the callback function of this sql > query I do a UPDATE, so when I do this update I get > database table is locked. > How I cant do the UPDATE in the second sqlite_exec() function?! Either separate the two operations or bring them closer together. To separate them do something like: BEGIN TRANSACTION; SELECT ...; -- Collate results -- Action results: UPDATE ...; UPDATE ...; ... UPDATE ...; END TRANSACTION; To bring them closer together do something like this: UPDATE foo = bar WHERE (SELECT ...) It depends on what your query is and how you want to update the table in response to your table data. Benjamin. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [sqlite] Performance problem
- Forwarded by Ben Carlyle/AU/IRSA/Rail on 07/11/2003 10:00 AM - Ben Carlyle 07/11/2003 10:00 AM To: "Mrs. Brisby" <[EMAIL PROTECTED]>@CORP cc: Subject:Re: [sqlite] Performance problem "Mrs. Brisby" <[EMAIL PROTECTED]> 07/11/2003 12:08 AM To: "Jonas Forsman / Axier.SE" <[EMAIL PROTECTED]> cc: "Clark, Chris" <[EMAIL PROTECTED]>, "D. Richard Hipp" <[EMAIL PROTECTED]>, [EMAIL PROTECTED] Subject:Re: [sqlite] Performance problem > On Wed, 2003-11-05 at 23:59, Jonas Forsman / Axier.SE wrote: > > Note: Testing has shown PostgreSQL's hash indexes to be similar or slower > > than B-tree indexes, and the index size and build time for hash indexes is > > much worse. Hash indexes also suffer poor performance under high > > concurrency. For these reasons, hash index use is discouraged. > Please note I'm note I'm not talking about a hash of the entire key- I'm > talking about n distinct b-trees that are selected by an 8->n bit > function. This transformation can be made very fast: We get a speed > improvement here on searches if our 8->n bit function takes less time > than n-1 random memcmp()'s. How would you handle the lack of ordering associate with hash tables? Sqlite can currently use indicies for three main tests: equals, less than, and greater than. While hash-tables are good at finding equal-to in constant time it usually means linear time (a table-scan) to test for less than or greater than. Do you have a solution to this problem? Benjamin. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[sqlite] database table is locked
Hi, Im doing a SELECT sql query, and in the callback function of this sql query I do a UPDATE, so when I do this update I get database table is locked. How I cant do the UPDATE in the second sqlite_exec() function?! Thanks, Thiago Mello - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [sqlite] Intentionally breaking SQLite integrity
Ben Nason wrote: In order to test my error handling if "PRAGMA integrity_check;" fails, I'm looking for an easy way to introduce an integrity error into a database. Any ideas? Try writing random binary data into the middle of the database file. You can do the most damage by writing random data into the bytes that immediately follow a 1k page boundary. But skip the first page, because changing it will make SQLite think the file isn't even a database so it won't even open the file. -- D. Richard Hipp -- [EMAIL PROTECTED] -- 704.948.4565 - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[sqlite] Intentionally breaking SQLite integrity
Hello, In order to test my error handling if "PRAGMA integrity_check;" fails, I'm looking for an easy way to introduce an integrity error into a database. Any ideas? Thanks, Ben -- "As I walk out my door, step into the pollution, I breathe in the problems, exhale solutions" - C-Rayz Walz, "Bent Life" - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[sqlite] No tables found by ODBC driver (Windows 2000)
I discovered sqlite today and it looks promising. Many times in the past I've needed a lightweight, distributable database engine. Checking it out, I created a small, one table database, using the SQLite Database Browser. I installed the SQLite ODBC driver, set up a user DSN (My computer is running Windows 2000, by the way) and then attempted to access the table from Excel via Microsoft Query. But when I attempt to open the database I receive a warning message: "This data source contains no visible tables." I tried creating a couple more tables in different ways and they all show up using the Database Browser, but whenever I try to access them from Microsoft Query via ODBC I continue to be warned of no visible tables. Could anyone suggest why my tables aren't being seen and what I can do so that they can be seen? - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [sqlite] locking
Kevin Waterson wrote: if you are inside of a transaction, can other people read the database? or does it lock the database file for the duration of the transaction? It locks the db. Regards, Frank - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: [sqlite] Fields parameters
> > I've got a question, how could I get the field parameters (e.g. id is > > integer and not null) I know that there is create table statment in > > SQLITE_MASTER for each table, but I want to use sqlite in program > > language > > there is no regular exp. in so it is hard to parse this statement, I'm > > looking for something like "describe table" statement in MySql. > > > > Check out the various pragmas, particularly table_info and > show_data_types. > > Thnx, I've tried it and it works, but I also need to know if field is part of key (or primary key) and if it is unique. S pozdravem Bronislav Klucka =[ pro2-soft.com ]= Bronislav Klucka Pro2-Soft +420 605 582 922 [EMAIL PROTECTED] * Windows & Web applications, Computer traininghttp://pro2-soft.com --- - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
