Lazarus
Home
Help
TinyPortal
Search
Login
Register
Lazarus
»
Forum
»
Programming
»
Databases
»
SOLVED: problem with count in sqlite
Free Pascal
Website
Downloads
Wiki
Documentation
Bugtracker
Mailing List
Lazarus
Website
Downloads (Laz+FPC)
Packages (OPM)
FAQ
Wiki
Documentation (RTL/FCL/LCL)
Bugtracker
CCR Bugs
IRC channel
GIT
Mailing List
Other languages
Foundation
Website
Useful Wiki Links
Project Roadmap
Getting the Source
Screenshots
How to use the forum
About donations (wiki)
Bookstore
Computer Math and Games in Pascal
(preview)
Lazarus Handbook
Search
Advanced search
Recent
Forum slow
by
Curt Carpenter
[
Today
at 03:41:07 am]
Arabic text, problem on L...
by
Zaher
[
Today
at 03:29:16 am]
InstallAware Using Lazaru...
by
TRon
[
Today
at 02:55:41 am]
Generics - correct syntax
by
Blaazen
[
Today
at 01:57:40 am]
Demoscene The Champs Crac...
by
Gigatron
[
Today
at 01:05:16 am]
How to use the Event Log?
by
n7800
[
Today
at 12:47:25 am]
v3.99 code completion que...
by
440bx
[
Today
at 12:45:55 am]
FpDebug breakpoint on "be...
by
440bx
[
Today
at 12:36:23 am]
Access violation when re-...
by
TRon
[April 19, 2024, 11:44:51 pm]
[solved] how to get class...
by
jamie
[April 19, 2024, 11:34:44 pm]
Lazarus for Windows on aa...
by
Wallaby
[April 19, 2024, 10:52:25 pm]
Poll: Watches and Display...
by
440bx
[April 19, 2024, 07:13:51 pm]
Who is Indy mattias?
by
paweld
[April 19, 2024, 04:17:53 pm]
I just released a commerc...
by
BrassGear
[April 19, 2024, 03:17:28 pm]
Does anyone know why thes...
by
Laksen
[April 19, 2024, 03:04:14 pm]
Database standards OR Am ...
by
gidesa
[April 19, 2024, 02:37:56 pm]
How to: create DLL file f...
by
TRon
[April 19, 2024, 02:26:53 pm]
A fairly simple sound sol...
by
paweld
[April 19, 2024, 01:46:11 pm]
Access violation when ope...
by
Чебурашка
[April 19, 2024, 12:27:34 pm]
Step-into the field sette...
by
Martin_fr
[April 19, 2024, 11:31:48 am]
AI, NLP and CAI: Text Gen...
by
Dzandaa
[April 19, 2024, 11:03:26 am]
dwindows for Android
by
PierceNg
[April 19, 2024, 10:54:44 am]
create system unit from s...
by
Laksen
[April 19, 2024, 10:53:57 am]
[Solved] Find child contr...
by
Joanna
[April 19, 2024, 09:53:43 am]
FpDebug unexpected Assemb...
by
Marc
[April 19, 2024, 08:46:38 am]
« previous
next »
Print
Pages: [
1
]
Author
Topic: SOLVED: problem with count in sqlite (Read 4525 times)
xaver13
Full Member
Posts: 111
SOLVED: problem with count in sqlite
«
on:
November 20, 2017, 08:05:25 pm »
Hello, I wanted to improve my working code. New lines are between "new added" and "new added end".
When I execute "Select count(ID) as cnt From wallet" in DB Browser it works fine.
But when I run this code in Lazarus, I get message on line 14 (open) about non existing column ... but this column exists!
Please any suggestions what could be wrong?
Code: Pascal
[Select]
[+]
[-]
procedure
TFormWallet2
.
FormActivate
(
Sender
:
TObject
)
;
begin
FormWallet2
.
DataSource1
.
DataSet
:
=
Query1
;
Query1
.
Close
;
SQLiteConnection1
.
Close
;
// Ensure the connection is closed when we start
SQLiteConnection1
.
Transaction
:
=
SQLTransaction1
;
SQLiteConnection1
.
DatabaseName
:
=
uWallet1
.
myHome
+
'/wallet.db'
;
SQLiteConnection1
.
Open
;
Query1
.
Database
:
=
SQLiteConnection1
;
SQLTransaction1
.
Database
:
=
SQLiteConnection1
;
SQLTransaction1
.
Active
:
=
True
;
//new added
Query1
.
SQL
.
Text
:
=
'Select count(ID) as cnt From wallet'
;
Query1
.
Open
;
ShowMessage
(
Query1
.
Fields
[
0
]
.
AsString
)
;
//recCount := Query1.Fields[0].AsInteger;
//recCount :=Query1.FieldByName('cnt').AsInteger;
//new added end
Query1
.
Close
;
Query1
.
SQL
.
Text
:
=
'Select * From wallet'
;
Query1
.
Open
;
«
Last Edit: November 21, 2017, 07:56:40 pm by xaver13
»
Logged
--
Jiri Cvrk
mangakissa
Hero Member
Posts: 1131
Re: problem with count in sqlite
«
Reply #1 on:
November 21, 2017, 08:57:42 am »
It works for me. Sometimes it's case sensitive and should the columnname set to 'id'
Have you tried to use count(*)?
Logged
Lazarus 2.06 (64b) / FPC 3.0.4 / Windows 10
stucked on Delphi 10.3.1
xaver13
Full Member
Posts: 111
Re: problem with count in sqlite
«
Reply #2 on:
November 21, 2017, 06:55:25 pm »
Quote from: mangakissa on November 21, 2017, 08:57:42 am
Have you tried to use count(*)?
Yes, I have tried count(*), with the same bad result. Maybe should be something wrong with the table? I will try to export it and import to another database.
Edited:
I have new database and tables established, but the error remains.
«
Last Edit: November 21, 2017, 07:06:17 pm by xaver13
»
Logged
--
Jiri Cvrk
xaver13
Full Member
Posts: 111
Re: problem with count in sqlite
«
Reply #3 on:
November 21, 2017, 07:56:20 pm »
This is working:
Code: Pascal
[Select]
[+]
[-]
FormWallet2
.
DataSource1
.
DataSet
:
=
Query1
;
Query1
.
Close
;
SQLiteConnection1
.
Close
;
// Ensure the connection is closed when we start
SQLiteConnection1
.
Transaction
:
=
SQLTransaction1
;
SQLiteConnection1
.
DatabaseName
:
=
uWallet1
.
myHome
+
'/wallet.db'
;
SQLiteConnection1
.
Open
;
Query1
.
Database
:
=
SQLiteConnection1
;
SQLTransaction1
.
Database
:
=
SQLiteConnection1
;
SQLTransaction1
.
Active
:
=
True
;
//new added
Query10
.
Database
:
=
SQLiteConnection1
;
Query10
.
SQL
.
Text
:
=
'Select count(id) as cnt From wallet'
;
//Query1.SQL.Text := 'Select max(id) as cnt From wallet';
Query10
.
Open
;
ShowMessage
(
Query10
.
Fields
[
0
]
.
AsString
)
;
//recCount := Query1.Fields[0].AsInteger;
//recCount :=Query1.FieldByName('cnt').AsInteger;
//new added end
Query10
.
Close
;
Query1
.
SQL
.
Text
:
=
'Select * From wallet'
;
Query1
.
Open
;
What I did not specified: the fragment of code is from a form, which uses TDBEdits, and the message was about DataField of some from it, and when I deleted this field message was changed to any TDBedit used and remained there.
When I added new Query, problem is solved. I have one piece of Connection, Transaction, Datasource but I need two Queries in this form.
«
Last Edit: November 22, 2017, 07:42:14 am by xaver13
»
Logged
--
Jiri Cvrk
mangakissa
Hero Member
Posts: 1131
Re: SOLVED: problem with count in sqlite
«
Reply #4 on:
November 22, 2017, 08:45:37 am »
That's not a problem.
Logged
Lazarus 2.06 (64b) / FPC 3.0.4 / Windows 10
stucked on Delphi 10.3.1
MacWomble
Jr. Member
Posts: 79
Re: SOLVED: problem with count in sqlite
«
Reply #5 on:
November 22, 2017, 09:05:49 am »
I use allways one special query in my applications for such special jobs like count, delete or something directly on the database - and after this, if neccassary, I send a refresh to the main query.
Logged
Mint 19.3 Cinnamon, FPC/ Lazarus Trunk 64Bit
Print
Pages: [
1
]
« previous
next »
Lazarus
»
Forum
»
Programming
»
Databases
»
SOLVED: problem with count in sqlite
TinyPortal
© 2005-2018