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ihudson

How do I add variables to a sqlite SELECT statement?

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ihudson

I'm just learning sqlite3 forgive me if my concepts are not right, anyway I'm trying to add two variables to a SELECT statement:

The variables would be $start and $end that the user would choose from a Combobox. The database holds 1 table (Distances) that has the distances between two locations ($start and $end).

In the code that follows (if possible) how can I place $start where "Midlothian MS" is and $end where "School Board" is in the Select statement? I've tried several types of concatenation but no joy.

Here is the schema:

CREATE TABLE fulldata (id integer primary key autoincrement, Start text,End text

,Distance integer);

_SQLite_Startup()
ConsoleWrite("_SQLite_LibVersion=" & _SQLite_LibVersion() & @CRLF)
_SQLite_Open('distance.db') ; open Database
_SQLite_QuerySingleRow(-1, "SELECT distance FROM fulldata WHERE Start = 'Midlothian MS' AND End = 'School Board';", $aRow)

_SQLite_Close()
_SQLite_Shutdown()
While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit
Case $Button1
MsgBox(0, "The distance is:",$aRow[0])
Case $Button2
_ArrayToClip($aRow, 0) ;send result to clipboard

EndSwitch
WEnd

Thanks for your help,

ihudson

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kylomas

ihudson,

Something like this should work

_SQLite_QuerySingleRow(-1, "SELECT distance FROM fulldata WHERE Start = '" & $start & "' AND End = '" & $end & "';", $aRow)

kylomas


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jchd

Safer version:

_SQLite_QuerySingleRow(-1, "SELECT distance FROM fulldata WHERE Start = " & _SQLite_FastEscape($start) & " AND End = " & _SQLite_FastEscape($end) & ";", $aRow)
Edited by jchd

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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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MvGulik

_SQLiteFastEscape() _SQLite_FastEscape()

[edit: fixed.]

Edited by MvGulik

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jchd

Correct, thanks.


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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