Jump to content
Sign in to follow this  
Zoldex

SQLite and Listview problem. Help needed!

Recommended Posts

Hi everybody!

I'm trying to use SQLite for the first time into an app with a listview.

I've already succesful managed to create a database, insert and update items, also on the listview! :sweating:

My problem is about deleting records.

I mean i can easily delete a record from a database with

_SQLite_Exec(-1, "DELETE FROM Database WHERE KEY = " & $selected_row_on_listview & ";")

and also from listview with

_GUICtrlListView_DeleteItemsSelected($listview)

but the difference is that if I have 5 records into the Database and I delete 1 in the middle (say KEY=3) I will have KEY values 0,1,2,4

BUT Listview updates its rows 0,1,2,3 so I couldn't use $selected_row_on_listview anymore, since if I click on row 3 it would try to delete a missing record.

Sorry if my question sounds silly but I'm really stuck now.

Thanks for any hints and forgive my poor english.

Also, any good example with SQLite and listview would be greatly appreciated.

Edited by Zoldex

Share this post


Link to post
Share on other sites

Zoldex,

I read the data from the SQLite query into an array. Then I have a function that loops through the array to populate the listview.

When I delete a selected row, I delete that row number from the array (and from the database) and then re-call the function to update the listview.

That way the array always has the rows in the same order as the listview, but in the delete statement to the database I can pass the KEY that is held in one of the array columns.

Another method would be to hold the database KEY value in a hidden column in the ListView.

Hope that gives you an idea.

NiVZ

Edited by NiVZ

Share this post


Link to post
Share on other sites

NiVZ,

thanks for your answer.

If I understand what you say, I should read again the whole table from database to update listview, each time I delete a record?

That's what I thought when I had the problem but don't know what would happen with very large databases.

I mean that it would become a slow process if I need to delete several rows...

Another method would be to hold the database KEY value in a hidden column in the ListView.

My KEY value is not displayed on the listview and is used only as a progressive counter, that would serve me to identify the row in the database.

Anyways, even if not displayed on listview, when I delete the row from the database it's really gone forever and creates a "hole" in the counter.

The listview, instead, updates itself all the index rows...

I would need a way to tell SQLite to "reorganize" the rows when a KEY in the middle is missing... like Listview does.

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
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By nacerbaaziz
      goodmorning autoit team
      today am comming with some winhttp problems, i hope that you can help me to solve them.
      the first problem
      is when opening a request
      my forums api allow me to delete any post using the api key
      all functions work, i mean post / get
      but when i tried to use the delete verb it's gave me an html 404 error
      here is what am tried
      #include "WinHttp.au3" ; Open needed handles Global $hOpen = _WinHttpOpen() Global $hConnect = _WinHttpConnect($hOpen, "xxxxxxxx.com") ; Specify the reguest: Global $hRequest = _WinHttpOpenRequest($hConnect, "Delete", "/vb/Api/posts/10447/?hard_delete=true", default, default) _WinHttpAddRequestHeaders($hRequest, "XF-Api-Key:xxxxx") _WinHttpAddRequestHeaders($hRequest, "XF-Api-User:xxxxx") ; Send request _WinHttpSendRequest($hRequest) ; Wait for the response _WinHttpReceiveResponse($hRequest) Global $sHeader = 0, $sReturned = 0 ; If there is data available... If _WinHttpQueryDataAvailable($hRequest) Then $sHeader = _WinHttpQueryHeaders($hRequest, $WINHTTP_QUERY_CONTENT_DISPOSITION) ;Or maybe: ; $sHeader = _WinHttpQueryHeaders($hRequest, BitOR($WINHTTP_QUERY_RAW_HEADERS_CRLF, $WINHTTP_QUERY_CUSTOM), "Content-Disposition") Do $sReturned &= _WinHttpReadData($hRequest) Until @error msgBox(64, "", $sReturned) endIf ; Close handles _WinHttpCloseHandle($hRequest) _WinHttpCloseHandle($hConnect) _WinHttpCloseHandle($hOpen)  
      and here is the error message
      <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN"> <html><head> <title>403 Forbidden</title> </head><body> <h1>Forbidden</h1> <p>You don't have permission to access /vb/Api/posts/10447/ on this server.<br /> </p> </body></html>  
      i hope you can help me 
      thanks in advance
    • By dmob
      So I am trying to implement an archive system of sorts for my (SQLite) DB app. I wrote a function to attach a separate (archive) DB and
      sync the columns with main DB. If archive DB file does not exist, create file with _SQLiteOpen then close the file (and thus connection) with SQLite_Close.
      This works as intended, however, after the create operation, all subsequent _SQLite_* functions returned a "Library misuse error".
      After a little digging I found the problem in the _SQLite_Close function: it clears the "last opened database" handle even when there still is a live
      DB connection open. All other functions then "think" there is no DB connection active. I hacked two functions in the UDF for a quick fix:

      In _SQLite_Close: Change
      ... $__g_hDB_SQLite = 0 __SQLite_hDel($__g_ahDBs_SQLite, $hDB) Return $iRval[0] to:
      $__g_hDB_SQLite = __SQLite_hDel($__g_ahDBs_SQLite, $hDB) Return $iRval[0] and in Func __SQLite_hDel changed
      Func __SQLite_hDel(ByRef $ahLists, $hGeneric) Local $iElement = _ArraySearch($ahLists, $hGeneric) If $iElement > 0 Then _ArrayDelete($ahLists, $iElement) EndFunc ;==>__SQLite_hDel to:
      Func __SQLite_hDel(ByRef $ahLists, $hGeneric) Local $iElement = _ArraySearch($ahLists, $hGeneric) If $iElement > 0 Then _ArrayDelete($ahLists, $iElement) Return $ahLists[UBound($ahLists)-1] ; Return last opened db EndIf Return 0 EndFunc ;==>__SQLite_hDel so it preserves last opened DB again.
       
      My archive function now works great
      I'm not sure if this should be classified as a bug, but I believe so...
      Hope this helps someone before
    • By argumentum
      #include <SQLite.au3> ;-- When SQLite is compiled with the JSON1 extensions it provides builtin tools ;-- for manipulating JSON data stored in the database. ;-- This is a gist showing SQLite return query as a JSON object. ;-- https://www.sqlite.org/json1.html Example() Func Example() _SQLite_Startup() ; "<your path>\sqlite3.dll", False, 1) ; https://www.autoitscript.com/autoit3/docs/libfunctions/_SQLite_Startup.htm _SQLite_Open() ; ...if you can not run this due to errors, get the latest DLL from https://www.sqlite.org/ If _SQLite_Exec(-1, "CREATE TABLE users (id INTEGER PRIMARY KEY NOT NULL, full_name TEXT NOT NULL, email TEXT NOT NULL, created DATE NOT NULL );") Then Return 4 If _SQLite_Exec(-1, 'INSERT INTO users VALUES ' & _ '(1, "Bob McFett", "bmcfett@hunters.com", "32-01-01"),' & _ '(2, "Angus O''Vader","angus.o@destroyers.com", "02-03-04"),' & _ '(3, "Imperator Colin", "c@c.c", "01-01-01");') Then Return 5 ; -- Get query data as a JSON object using the ; -- json_group_object() [1] and json_object() [2] functions. _SQLite_GetTable2d_ArrayToConsole("SELECT" & _ " json_group_object(" & _ " email," & _ " json_object('full_name', full_name, 'created', created)" & _ " ) AS json_result" & _ " FROM (SELECT * FROM users WHERE created > ""02-01-01"");") ; {"bmcfett@hunters.com":{"full_name":"Bob McFett","created":"32-01-01"},"angus.o@destroyers.com":{"full_name":"Angus O'Vader","created":"02-03-04"}} ; -- Get query data as a JSON object using the ; -- json_group_array() function to maintain order. _SQLite_GetTable2d_ArrayToConsole("SELECT" & _ " json_group_array(" & _ " json_object('full_name', full_name, 'created', created)" & _ " ) AS my_json_result_OrAnythingReally" & _ " FROM (SELECT * FROM users ORDER BY created);") ; [{"full_name":"Imperator Colin","created":"01-01-01"},{"full_name":"Angus O'Vader","created":"02-03-04"},{"full_name":"Bob McFett","created":"32-01-01"}] ;-- Links ;-- [1] https://www.sqlite.org/json1.html#jgroupobject ;-- [2] https://www.sqlite.org/json1.html#jobj ; example found at https://gist.github.com/akehrer/481a38477dd0518ec0086ac66e38e0e2 EndFunc ;==>Example Func _SQLite_GetTable2d_ArrayToConsole($sSQL, $hDB = -1) Local $aResult, $iRows, $iColumns If _SQLite_GetTable2d($hDB, $sSQL, $aResult, $iRows, $iColumns) Then ConsoleWrite("! SQLite Error: " & _SQLite_ErrCode($hDB) & @CRLF & "! " & _SQLite_ErrMsg($hDB) & @CRLF) Else _SQLite_Display2DResult($aResult) EndIf ConsoleWrite(@CRLF) EndFunc ;==>_SQLite_GetTable2d_ArrayToConsole Based on this example, you can build your own query. 
      The code has all the explanations.
      Enjoy  
    • By argumentum
      #include <SQLite.au3> ;~ #include <SQLite.dll.au3> Local $hQuery, $aRow, $aNames _SQLite_Startup() ConsoleWrite("_SQLite_LibVersion=" & _SQLite_LibVersion() & @CRLF) _SQLite_Open() ; open :memory: Database _SQLite_Exec(-1, "CREATE TABLE aTest (A,B int not null unique ,C text);") _SQLite_Exec(-1, "INSERT INTO aTest(a,b,c) VALUES ('c','2','World');") _SQLite_Exec(-1, "INSERT INTO aTest(a,b,c) VALUES ('b','3',' ');") _SQLite_Exec(-1, "INSERT INTO aTest(a,b,c) VALUES ('a','1','Hello');") _SQLite_Query(-1, "SELECT _ROWID_,* FROM aTest ORDER BY a;", $hQuery) _SQLite_FetchTypes($hQuery, $aNames) ; Read out Column Types ConsoleWrite(StringFormat(" %-10s %-10s %-10s %-10s ", $aNames[0], $aNames[1], $aNames[2], $aNames[3]) & @CRLF) _SQLite_FetchNames($hQuery, $aNames) ; Read out Column Names ConsoleWrite(StringFormat(" %-10s %-10s %-10s %-10s ", $aNames[0], $aNames[1], $aNames[2], $aNames[3]) & @CRLF) While _SQLite_FetchData($hQuery, $aRow) = $SQLITE_OK ConsoleWrite(StringFormat(" %-10s %-10s %-10s %-10s ", $aRow[0], $aRow[1], $aRow[2], $aRow[3]) & @CRLF) WEnd _SQLite_Exec(-1, "DROP TABLE aTest;") _SQLite_Close() _SQLite_Shutdown() ; Output: ; INTEGER int text ; rowid A B C ; 3 a 1 Hello ; 2 b 3 ; 1 c 2 World Func _SQLite_FetchTypes($hQuery, ByRef $aTypes) Dim $aTypes[1] If __SQLite_hChk($hQuery, 3, False) Then Return SetError(@error, 0, $SQLITE_MISUSE) Local $avDataCnt = DllCall($__g_hDll_SQLite, "int:cdecl", "sqlite3_column_count", "ptr", $hQuery) If @error Then Return SetError(1, @error, $SQLITE_MISUSE) ; DllCall error If $avDataCnt[0] <= 0 Then Return SetError(-1, 0, $SQLITE_DONE) ReDim $aTypes[$avDataCnt[0]] Local $avColName For $iCnt = 0 To $avDataCnt[0] - 1 $avColName = DllCall($__g_hDll_SQLite, "wstr:cdecl", "sqlite3_column_decltype16", "ptr", $hQuery, "int", $iCnt) If @error Then Return SetError(2, @error, $SQLITE_MISUSE) ; DllCall error $aTypes[$iCnt] = $avColName[0] Next Return $SQLITE_OK EndFunc ;==>_SQLite_FetchTypes  If you wanna build a proper JSON string, you may want to know if is {"int":123} or {"text":"123"}
      and for that, this can help, obviously only when declared in the SQLite table.
    • By argumentum
      I was thinking but I don't have the experience, so you may have the experience.
      I was thinking to chop a DB with 100.000 ( 20 columns ) in 10.000 DB chunks ( 10 DBs ) and query concurrently all of them to speed up a search, then add the results. Is that a sound idea ? Or will I run in trouble down the road. Should a DB better be keep in one piece ?
      The DB is now in MySQL. I wanna do all this chopping and use SQLite. 
      Thanks
      [solved]
×
×
  • Create New...