Re: [sqlite] PySQLite problem
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Cesar D. Rodas wrote: > Any one had an idea how to solve this problem? I am not 100% certain about this, but I believe the cause is: * SQLite doesn't check that strings you insert are valid UTF-8. It assumes that what you supply is correct. * pysqlite doesn't check either, or you used a different program to insert the data. That basically means that what went into the database is in some other encoding. * When you retrieved the data, either pysqlite or SQLite tried to treat it as valid UTF-8 and it turned out not to be, hence the error Roger -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFHcs04mOOfHg372QQRAnU0AKDjJRCaykwYUl2opgir6DWu3y02vQCgmg30 KQqplC4HXxwxS5aXbvKN1ug= =k4mo -END PGP SIGNATURE- - To unsubscribe, send email to [EMAIL PROTECTED] -
Re: [sqlite] shared cache and 'no such table' issue
I found that the sqlite3_open call is not thread safe even if you open different files in separate connections. Cannot tell you about sqlite3_close but may be the same problem. Darío On Dec 26, 2007 6:40 AM, Pathompong Puengrostham <[EMAIL PROTECTED]> wrote: > Hi, > > I have a multi-threaded program. Each thread opens a connection to the same > database file. It runs fine most of the time but sometime I get a 'no such > table' error from a SQL select statement. It appears that if one thread > close the database connection, it closes all the schema without checking > nRef in BtShared. This make other threads receive a 'no such table' error. > > Do I get it right that schema is also shared together with Btree? When > shared cache mode is enabled, does SQLite really share cache within one > thread and not between other threads? I don't know much about internal of > SQLite. But from looking at the source code, there is only one > sqlite3SharedCacheList variable that is shared with every threads. > > Jay > - To unsubscribe, send email to [EMAIL PROTECTED] -
[sqlite] Regarding sqlite website...
Hello, Merry x-mass to everyone, I'd like to know if all the documentation ( http://www.sqlite.org/c3ref/update_hook.html for example) was generating with a software that generate documentation from source code or it was generated by a human. If the first option is true, does any one can tell me where can I download that software? Regards -- Best Regards Cesar D. Rodas http://www.cesarodas.com http://www.thyphp.com http://www.phpajax.org Phone: +595-961-974165
Re: Re[2]: [sqlite] Fastest way to check if new row or update existing one?
On Wed, 26 Dec 2007 10:17:43 +0200, Ion Silvestru <[EMAIL PROTECTED]> wrote: >>>QUESTION: is there a better way to make this important decision? using >>>Sqlite > >>INSERT OR REPLACE may work for you. > >There is a problem with "INSERT OR REPLACE" in that "REPLACE" is not >truly , but is (existing row is deleted and >new row is added), or I am wrong? It is a full replacement of the row, just as the word REPLACE (Take the place or move into the position of) suggests. Perhaps you are confused with UPDATE. REPLACE has been introduced to increase compatibility with other database engines, they all follow the same strategy. >If I am correct, then a question to developers of SQLite: > >Is it difficult to change the behaviour of the "REPLACE" part of "INSERT OR >REPLACE" >to be the correct behaviour, row content is updated, and not deleted then >inserted? What would be the difference? I guess your new row doesn't provide some of the column values of the existing row, and you want to keep some of those. In that case, SELECT / UPDATE is the only option. To change the behaviour of REPLACE into selective updating of columns SQLite would have to know which columns it would have to update and which not. It simply can't. A nice solution is found in Date: Tue, 24 Apr 2007 14:36:48 -0400 Subject: [sqlite] Re: INSERT OR REPLACE without new rowid , Message-ID: <[EMAIL PROTECTED]> : IT> You can do IT> IT> UPDATE ... WHERE keyfield='xxx'; IT> IT> then use sqlite3_changes to see whether any update IT> has in fact taken place, and run INSERT if not. IT> IT> Igor Tandetnik >Thanks in advance and happy hollidays! HTH -- ( Kees Nuyt ) c[_] - To unsubscribe, send email to [EMAIL PROTECTED] -
[sqlite] shared cache and 'no such table' issue
Hi, I have a multi-threaded program. Each thread opens a connection to the same database file. It runs fine most of the time but sometime I get a 'no such table' error from a SQL select statement. It appears that if one thread close the database connection, it closes all the schema without checking nRef in BtShared. This make other threads receive a 'no such table' error. Do I get it right that schema is also shared together with Btree? When shared cache mode is enabled, does SQLite really share cache within one thread and not between other threads? I don't know much about internal of SQLite. But from looking at the source code, there is only one sqlite3SharedCacheList variable that is shared with every threads. Jay
Re[2]: [sqlite] Fastest way to check if new row or update existing one?
>>QUESTION: is there a better way to make this important decision? using >>Sqlite >INSERT OR REPLACE may work for you. There is a problem with "INSERT OR REPLACE" in that "REPLACE" is not truly , but is (existing row is deleted and new row is added), or I am wrong? If I am correct, then a question to developers of SQLite: Is it difficult to change the behaviour of the "REPLACE" part of "INSERT OR REPLACE" to be the correct behaviour, row content is updated, and not deleted then inserted? Thanks in advance and happy hollidays! - To unsubscribe, send email to [EMAIL PROTECTED] -
