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SOLVED: problem with count in sqlite
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Topic: SOLVED: problem with count in sqlite (Read 4516 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
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