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jcpetu

SQLite Index

11 posts in this topic

Hi,

I would like to know if it is any reference on how can I use the INDEX feature of SQLite whiting Autoit.

thanks in advance and regards.

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Hi Zedna, I can create the Index with sqlitebrowser.exe no problem, thing is how can I use it in Autoit.

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and to use the index to search for a record?, how can I open de base indexed and then search for a record?

 

With no indexed database I do:

_SQLite_QuerySingleRow($dbn, "SELECT * FROM Contacts WHERE name='" & $s1 & "' ORDER BY name", $r) == $SQLITE_OK

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Zedna, I just saw your answer. I'll give it a try.

thanks a lot and regards.

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#8 ·  Posted (edited)

As far as I know SQLite use (in SELECT,UPDATE,DELETE) apropriate index automatically.

You have to just create suitable index.

But as I have written, you can explicitly use particular index in SELECT clausule, see my previous post ...

Edited by Zedna

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Thanks a lot.

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#10 ·  Posted (edited)

As far as I know SQLite use (in SELECT,UPDATE,DELETE) apropriate index automatically.

 

You can check it yourself, just measure time for desired SELECT FROM WHERE ... with and without index.

You will see that you don't need to explicitly write index in SELECT and SQLite will use it anyway if it's available.

Without index it will be slower.

Edited by Zedna

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Post your database schema and typical queries so we can advise you efficiently.

Beware of using = as this isn't case sensitive while LIKE is by default (albeit slower).

Also whenever $S1 contains a single quote, like "O'Connor" then your query will error out. The correct way is:

_SQLite_QuerySingleRow($dbn, "SELECT * FROM Contacts WHERE name='" & _SQLite_FastEscape($s1) & "' ORDER BY name", $r) == $SQLITE_OK

This wonderful site allows debugging and testing regular expressions (many flavors available). An absolute must have in your bookmarks.
Another excellent RegExp tutorial. Don't forget downloading your copy of up-to-date pcretest.exe and pcregrep.exe here
RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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