Jump to content
Burgs

call 'tables' in SQLite...?

Recommended Posts

Burgs

Greetings,

  I have SQLite setup within my AutoIT program...I'm trying to accomplish what should be a relatively simple task.  I want to be able to return an array of 'table' names for an established database...I believe this might be possible using the '_SQLite_SQLiteExe' command...since it seems to be able to access SQLite schemas...?  The ".tables" command is one of them...if I am not mistaken that command returns a list of all table names in the active database.

  I am attempting the following:

#include <SQLite.au3>
#include <SQLite.dll.au3>

Global $hDb, $sIn, $sOut

...

$sIn = ".tables" & @CRLF  
_SQLite_SQLiteExe($hDb, $sIn, $sOut)  

 if @error == 0 Then
    ;Show Table (using SQLite3.dll)
 Else
  if @error == 2 Then
  ConsoleWrite("ERROR: Sqlite3.exe file not found" & @CRLF)
  Else
  ConsoleWrite("ERROR: @error=" & @error & " when calling _SQLite_SQLiteExe" & @CRLF)
  EndIf  ;@error is "2"...OR NOT...
 EndIf  ;@error is "0"...OR NOT...
 
 ...

  The error being thrown is "ERROR: Sqlite3.exe file not found" ...

  Am I required to have the Sqlite3.exe installed in my directory (i.e. @ScriptsDir)...???  I do not have it in there at present because I did not believe it was necessary with the 'include' calls to "SQLite.au3" and "SQLite.dll.au3"...any advice appreciated.  Thanks in advance. 

Regards

 

 

 

 

 

 

 

Share this post


Link to post
Share on other sites
jchd

You definitely don't need to use the command-line utility sqlite3.exe to get a list of tables.

Use this SQL query to retrieve an ordered list of tables in the Main database:

select tbl_name "Table" from sqlite_master where type = 'table' order by "Table";

_SQLite_GetTable() is a good way to return that array of strings.


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)

Share this post


Link to post
Share on other sites
Burgs

Hello jchd,

  Thanks for the response...I'll give that a try later when I have a chance.  I knew '_SQLite_GetTable()' can get the row data...but I would have to know what table name to pass into it. 

  Can the '_SQLite_Query' be passed any valid SQLite command...?  I was under the impression it could only be used with certain commands as given in the manual documentation...?

  Just to verify I have the syntax correct...my code should read:

 

_SQLite_Query($hDb, "select tbl_name "Table" from sqlite_master where type = 'table' order by "Table";", $hQuery)

 

  correct...?   

  Thanks again for your post...much appreciated.

Share this post


Link to post
Share on other sites
benners

In this instance you'll have to double quote the Table

_SQLite_Query($hDb, "select tbl_name ""Table"" from sqlite_master where type = 'table' order by ""Table"";", $hQuery)

 

Share this post


Link to post
Share on other sites
kylomas

Burgs,

An example of some functions that I use occasionally...

#include <SQLite.au3>

; sqlite3.dll can be in any of the following @ScriptDir, @SystemDir, @WindowsDir, or @WorkingDir.
_SQLite_Startup('sqlite3.dll')

; open a memory DB
Local $hdb = _SQLite_Open()

; create memory DB with some tables
Local $sql = 'create table t1 (a1, a2, a3);'
$sql &= 'create table t2 (b1, b2, b3);'
$sql &= 'create table t3 (c1, c2, c3);'
_SQLite_Exec($hdb, $sql)

_ArrayDisplay(table_list())
_ArrayDisplay(column_list('t2'))

If table_exists('t3') Then ConsoleWrite('t3 exists' & @CRLF)

_SQLite_Shutdown()

; some functions that I use occasionally to interrogate configuration
Func table_exists($tbl)
    Local $rows, $nbrows, $nbcols, $ret
    $ret = _SQLite_GetTable2d(-1, "select * from sqlite_master where name = " & "'" & $tbl & "'" & ";", $rows, $nbrows, $nbcols)
    If @error Then ConsoleWrite(@error & ' ' & @extended & ' ' & $ret & @LF)
    If $nbrows > 0 Then
        Return True
    Else
        Return False
    EndIf
EndFunc   ;==>table_exists

Func table_list()
    Local $rows, $nbrows, $nbcols
    $ret = _SQLite_GetTable2d(-1, "select * from sqlite_master;", $rows, $nbrows, $nbcols, 1000)
    If @error Then ConsoleWrite(@error & ' ' & @extended & ' ' & $ret & @LF)
    Return $rows
EndFunc   ;==>table_list

Func column_list($tbl)
    Local $rows, $nbrows, $nbcols
    $ret = _SQLite_GetTable2d(-1, "pragma table_info(" & $tbl & ");", $rows, $nbrows, $nbcols)
    If @error Then ConsoleWrite(@error & ' ' & @extended & ' ' & $ret & @LF)
    Return $rows
EndFunc   ;==>column_list

kylomas


Forum Rules         Procedure for posting code

"I like pigs.  Dogs look up to us.  Cats look down on us.  Pigs treat us as equals."

- Sir Winston Churchill

Share this post


Link to post
Share on other sites
Burgs

Thanks to all who posted replies...that clarification and other information are extremely useful...I'm new to using SQLite and I will find this very helpful...much appreciation to all of you...regards

Share this post


Link to post
Share on other sites
Earthshine

Learn SQL well. It’s your friend with lots of databases


My resources are limited. You must ask the right questions

 

Share this post


Link to post
Share on other sites
jchd

In my example I decided to put the (optional) alias name "Table" inside double quotes as it's a reserved SQL keyword. But in this case SQLite is clever enough to understand the query even if you don't put double quotes there. They would be obligatory if you wanted the alias to be "The name of my tables", because of whitespaces in the name.

Forget about _SQLite_Query and the code complexities it requires. Prefer the higher-level *_GetTable[2d] or *_Exec functions.


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)

Share this post


Link to post
Share on other sites
Earthshine

My advice Comes from years programming with work in Oracle and SQL server


My resources are limited. You must ask the right questions

 

Share this post


Link to post
Share on other sites
water

NB:
"==" is the string compare operator. As @error is set to an integer you should use the ordinary compare operator:

if @error = 0 Then

The result is the same but it's cleaner coding ;)

  • Like 1

My UDFs and Tutorials:

Spoiler

UDFs:
Active Directory (2018-06-01 - Version 1.4.9.0) - Download - General Help & Support - Example Scripts - Wiki
OutlookEX (NEW 2018-09-01 - Version 1.3.4.0) - Download - General Help & Support - Example Scripts - Wiki
ExcelChart (2017-07-21 - Version 0.4.0.1) - Download - General Help & Support - Example Scripts
PowerPoint (2017-06-06 - Version 0.0.5.0) - Download - General Help & Support
Excel - Example Scripts - Wiki
Word - Wiki
 
Tutorials:

ADO - Wiki

 

Share this post


Link to post
Share on other sites
Burgs

Yes I agree SQLite is quite powerful...and I become more impressed the more acclimated I become with it.  Thanks as well for the syntax clarifications...yes I tend to use "==" out of habit...

thanks again to all who replied   :)

 

Share this post


Link to post
Share on other sites
jchd

I'd guess you'll soon find it's 10 times as powerfull, 100 times more flexible and 1M times as ubiquitous as you currently feel it is.
Needless to say, I'm a big, really big fan, so my opinion is 100% biaised (yet based on solid facts).

Have fun with an example:

 


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)

Share this post


Link to post
Share on other sites
Burgs

Hi,

  As you stated ..."Serious warning: the SQL involved is NOT for heartfainted people."...   you are not kidding are you...  :)   hehehe

  well done...yes a great example of what might be accomplished using SQLite, thanks again mate...

 

  • Like 1

Share this post


Link to post
Share on other sites
jchd

I agree this example is a bit extreme but it has the merit to show that SQL in general can solve non-trivial problems elegantly and very efficiently, well beyond the traditional "handle my business data" domain. SQLite also has the huge benefit of it's incredible portability: the very same SQLite code would return the exact same result on any device running a recent enough SQLite3 version (your TV, modem, router, GPS, set top box, mainframe, Raspberry Pi, PC, smartphone, tablet, ...)


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)

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • Eminence
      By Eminence
      Hello,
      Using SQLite, I was trying to select a specific column with having duplicate entries removed by using the DISTINCT function. 
      Local $sQuery = "SELECT DISTINCT supervisor, COUNT(DISTINCT employee_name) FROM data_db What the above snippet does is just list only one supervisor but with the total count of unique employee names in the whole database when it should be listing out all supervisor entries from the database and list the total count of employees per each supervisors. If I remove the COUNT function, it does list out all unique entries of supervisor names from the list. Attached is a screenshot of an example database as well. 
      Any help will be much appreciated. Thank you!

    • Seminko
      By Seminko
      Hey,
      I have a script that uses SQLite. It worked without a hiccup on my W7 system.
      However, last week I bought a new machine, installed W10 and autoit, and now I'm getting an error during _SQLite_Startup.
      Can anyone advise on how to find what's wrong? Tried checking $__g_hPrintCallback_SQLite but that returns nothing.
       
      Tried downloading the latest version of the dll from the link in the function page and I also replaced the default SQLite.dll.au3 that came with AutoIt with the one that came with the latest SQLite version zip.
       
      Relevant parts of my script:
      #include <SQLite.au3> #include <SQLite.dll.au3> _SQLite_Startup(@ScriptDir & "\Config\sqlite3_x64.dll", False, 1) If @error Then MsgBox(16, "SQLite Error", "SQLite3.dll Can't be Loaded! - " & $__g_hPrintCallback_SQLite & @CRLF & @CRLF & "Exiting application / Zavolej Honzovi") Exit -1 EndIf  
      Thanks
      S.
    • FrancescoDiMuro
      By FrancescoDiMuro
      Good evening everyone
      I am building a management for the company I work with, and I just imported a real amount of rows ( about 29000 ), in my SQLite DB.
      The thing I am not understanding, is the time that the script takes to build this amount of rows in the ListView.
      I didn't measure it, but I think it took 2 minutes or so to create each ListView item...
      It is normal that it takes so much time?
      What can I do to improve the creation of the items?

      Here's the code I am using to query and to create ListView items...
      ; Articles ListView: Global $lvwArticles = GUICtrlCreateListView("ID|Fornitore|Codice|Descrizione|EU|Prezzo|Sconto Applicato|Note", 14, 87, 1507, 660, BitOR($GUI_SS_DEFAULT_LISTVIEW,$LVS_SORTASCENDING,$LVS_SORTDESCENDING), BitOR($WS_EX_CLIENTEDGE,$LVS_EX_GRIDLINES,$LVS_EX_FULLROWSELECT)) ; Query $strQuery = "SELECT * FROM ARTICOLI;" ; Query Execution _SQLite_GetTable2d($objDatabase, $strQuery, $arrResult, $intRows, $intColumns) If @error Then ; Error Handling Else ; Cleaning the ListView _GUICtrlListView_DeleteAllItems($lvwArticles) If @error Then ; Error Handling Else ; No records in the Table If UBound($arrResult) < 2 Then ; Error Handling Else _GUICtrlListView_BeginUpdate($lvwArticles) For $intCounter = 1 To UBound($arrResult) - 1 $strListViewItem = $arrResult[$intCounter][0] & "|" & _ $arrResult[$intCounter][1] & "|" & _ $arrResult[$intCounter][2] & "|" & _ $arrResult[$intCounter][3] & "|" & _ $arrResult[$intCounter][4] & "|" & _ $arrResult[$intCounter][5] & "|" & _ $arrResult[$intCounter][6] & "|" & _ $arrResult[$intCounter][7] $objListViewItem = GUICtrlCreateListViewItem($strListViewItem, $lvwArticles) Next _GUICtrlListView_EndUpdate($lvwArticles) EndIf EndIf EndIf Thanks in advance


      Best Regards.
    • dangr82
      By dangr82
       
      I have created this function for a database, but I can not make it work. I always have two error messages: "not an error" ... and the file created, in the script directory, does not contain anything.
      Global $sDBName = "Hen.db" Func DatabaseTable() Local $sConnDB _SQLite_Startup() If @error Then MsgBox($MB_SYSTEMMODAL, "SQLite Error", "SQLite.dll Can't be Loaded!") Exit -1 EndIf $sConnDB = _SQLite_Open($sDBName) If @error Then MsgBox($MB_SYSTEMMODAL, "SQLite Error", "Can't Load Database!") Exit -1 EndIf If Not _SQLite_Exec($sDBName, 'CREATE TABLE Animal ("Name", "Age");') = $SQLITE_OK Then MsgBox($MB_SYSTEMMODAL, "SQLite Error", _SQLite_ErrMsg()) If Not _SQLite_Exec($sDBName, 'INSERT INTO Animale VALUES ("Charlie","5");') = $SQLITE_OK Then MsgBox($MB_SYSTEMMODAL, "SQLite Error", _SQLite_ErrMsg()) _SQLite_Close($sConnDB) _SQLite_Shutdown() EndFunc  
    • Eminence
      By Eminence
      Hello,
      I've been searching on how to select the first row in my database which includes a time column based on the latest start_time date for today's date.
      This is my current code:
      Local $iCurrentDate = _Now() Local $sqlHandle = _dbOpen($sDbPath) Local $aResult, $iRows, $iCols _SQLite_GetTable2d($sqlHandle, "SELECT start_time FROM " & $srawDb & " ORDER BY datetime(start_time) DESC LIMIT 1", $aResult, $iRows, $iCols) _ArrayDisplay($aResult) _dbClose($sDbpath) What it does is it gets the first row entry in the database however it does not select the latest start_time entry in the database, it always select the first row. I've tried changing DESC to ASC to see if that will do it but the issue still remains. Any thoughts on this? Thanks in advance.
       
      *EDIT
      The date format in the database is by MM/DD/YYYY HH:MM:SS.
×