Jump to content

Recommended Posts

Posted (edited)
#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.

Edited by argumentum

Share this post


Link to post
Share on other sites
Posted (edited)

Don't believe this!

You can store any type in (almost) any column of any row, you can declare fantasy types or no type at all.

The only reliable way to know which default type a result column of the current row is is to invoke sqlite3_column_type(), which returns the type of the data as it is for each value of each row. Nonetheless you can still force conversion by calling a retrieval function for another type.

A column declared INT can store the string value 'abc123' in a given row; sqlite3_column_type() would return SQLITE_TEXT but you can call sqlite3_column_blob() to force conversion to binary and retrieve the corresponding blob.

Of course the conversions you can force this way don't always make sense. A picture stored as a 3.5 Mb blob value in a column declared CHAR and retrieved with sqlite3_column_int64() is going to be deceptive.

Edited by jchd

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
19 minutes ago, jchd said:

The only reliable way to know which default type a result column of the current row is is to invoke sqlite3_column_type(), which returns the type of the data as it is for each value of each row.

lol, yes, SQLite is some fantastic piece of code. The only column that'll adhere to INTEGER is the RowID. ( ...or PK if I understand that right )
But the expectation of a column defined as INT by the coder, is to pull INTegers from that column and attempt to use it as INT.
If I declare a column "MyStuffType", SQLite will return it as "MyStuffType" type in the above function.
Declarations do help organize the code, and if:

3 hours ago, argumentum said:

you wanna build a proper JSON string, you may want to know if is {"int":123} or {"text":"123"}

And that's the idea :) 

Share this post


Link to post
Share on other sites

Under the assumption that correctly declared types are actually enforced by inserts and updates, then this function will work.

I only made the point to warn unsuspecting readers to fall into the trap.


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

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • 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
      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]
    • By Skysnake
      Hi
      I am trying to set Accelerator keys from an array.
      I select the KEY and CONTROL from a SQLite table, the Array looks like that generated for the Helpfile, but I can't get the CONTROLS to resolve...
      I though about Assign & Eval, but not sure if that's a step in the right direction. IsDeclared shows that the $var exists in Local Scope -1.  
       
      Local $Main = GUICreate("Custom MsgBox", 225, 80) GUICtrlCreateLabel("Please select a button.", 10, 10) Local $idButton_Yes = GUICtrlCreateButton("Yes", 10, 50, 65, 25) Local $idButton_No = GUICtrlCreateButton("No", 80, 50, 65, 25) Local $idButton_Exit = GUICtrlCreateButton("Exit", 150, 50, 65, 25) Local $query, $aResult, $iRows, $iColumns $query = "" ;reset $query = "Select hotkey_key, hotkey_ctrl from mytable where mykeys = 'hotkey' ; " ; ; Query $iRval = _SQLite_GetTable2d($sqliteDb, $query, $aResult, $iRows, $iColumns) If $iRval = $SQLITE_OK Then Local $sizeofHotkeys = UBound($aResult) - 1 ConsoleWrite("$sizeofHotkeys " & $sizeofHotkeys & @CRLF) If $sizeofHotkeys > 0 Then Local $main__aAccelKeys[$sizeofHotkeys][2] For $i = 0 To $sizeofHotkeys - 1 $j = $i + 1 ; replace friendly text with code -- ! alt + Shift ^ Ctrl # Windows $aResult[$j][0] = StringReplace($aResult[$j][0], "Alt", "!") $aResult[$j][0] = StringReplace($aResult[$j][0], "Shift", "+") $aResult[$j][0] = StringReplace($aResult[$j][0], "Ctrl", "^") $main__aAccelKeys[$i][0] = $aResult[$j][0] ;--- $main__aAccelKeys[$i][1] = $aResult[$j][1] ;--- Next ;~ Row|Col 0|Col 1 ;~ Row 0|F2|$idButton_Yes ;~ Row 1|F3|$idButton_No _DebugArrayDisplay($main__aAccelKeys) Local $rv = GUISetAccelerators($main__aAccelKeys, $Main) GUISetState(@SW_SHOW) ; Display the GUI.  
      Please note that this is a modified Helpfile example.
      The Helpfile specifies (a) WinHandle and (b) last Gui created.
      --> the example uses a control not a WinHandle and (b) what happens with ChildGuis? Also, the HelpFile specifies lower case, yet the examples show "{F1}" upper case?
      Also, is there a way to check the result of the GuiSetAccelerator function? 
      Note, if I add these to lines after the FOR loop, then the F1 works, and the DebugArrayDisplays shows control 4... not it's name... So I am in the right place, but my $vars names do not convert to their control numbers in the GUI
      Next $main__aAccelKeys[$sizeofHotkeys - 1][0] = "{F1}" ; -- -- use the extra row for the F1 $main__aAccelKeys[$sizeofHotkeys - 1][1] = $ChmHLP ;--- Skysnake
    • By Skeletor
      Hi All,
      Here's a really simple question. 
      I ran the code from the helpfile under: _SQLite_Open

      Issue is I end up with an error message: SQLite3.dll Can't be Loaded!
      I placed the *.dll in the include folder, but still nothing. 

      Where must this file be placed.
       
×
×
  • Create New...