Lazarus
Home
Help
TinyPortal
Search
Login
Register
Lazarus
»
Forum
»
Free Pascal
»
Database
(Moderators:
FPK
,
Tomas Hajny
) »
fpweb and sqlquery
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
How to: create DLL file f...
by
440bx
[
Today
at 12:42:21 pm]
Access violation when ope...
by
Чебурашка
[
Today
at 12:27:34 pm]
Database standards OR Am ...
by
egsuh
[
Today
at 12:02:06 pm]
Step-into the field sette...
by
Martin_fr
[
Today
at 11:31:48 am]
Access violation when re-...
by
Chris Osborne
[
Today
at 11:31:25 am]
AI, NLP and CAI: Text Gen...
by
Dzandaa
[
Today
at 11:03:26 am]
Who is Indy mattias?
by
jollytall
[
Today
at 11:01:45 am]
dwindows for Android
by
PierceNg
[
Today
at 10:54:44 am]
create system unit from s...
by
Laksen
[
Today
at 10:53:57 am]
how to get class and meth...
by
cdbc
[
Today
at 10:52:22 am]
[Solved] Find child contr...
by
Joanna
[
Today
at 09:53:43 am]
FpDebug unexpected Assemb...
by
Marc
[
Today
at 08:46:38 am]
Offical launch of the 1 B...
by
Handoko
[
Today
at 07:59:07 am]
Big Numbers Math
by
iLya2IK
[
Today
at 07:13:20 am]
Lazarus for Windows on aa...
by
dbannon
[
Today
at 07:02:55 am]
BUG REPORT: Unable to gen...
by
dbannon
[
Today
at 06:29:49 am]
what to do if my target M...
by
Laksen
[
Today
at 12:49:12 am]
For-in loop over constant...
by
ASerge
[
Today
at 12:36:09 am]
Converting a string/index...
by
TRon
[April 18, 2024, 11:56:37 pm]
exclude ALL packages from...
by
PascalDragon
[April 18, 2024, 11:33:29 pm]
Demoscene The Champs Crac...
by
KodeZwerg
[April 18, 2024, 11:29:50 pm]
Poll: Watches and Display...
by
440bx
[April 18, 2024, 10:55:14 pm]
Have anyone develop UEFI ...
by
PascalDragon
[April 18, 2024, 10:14:15 pm]
The weird Rewrite bug
by
PascalDragon
[April 18, 2024, 09:58:53 pm]
Assign (textfile) not com...
by
PascalDragon
[April 18, 2024, 09:51:50 pm]
« previous
next »
Print
Pages: [
1
]
Author
Topic: fpweb and sqlquery (Read 4765 times)
dasa2
New member
Posts: 9
fpweb and sqlquery
«
on:
June 14, 2021, 10:19:02 pm »
I am building an HTTP server application with fpweb and want to run a sqlquery to verify that the username exist in db but getting an access violation when i try to run my sqlquery. What am i doing wrong here?
with SQLQuery1 do -> SQLQuery1 = <TSQLQUERY> = Cannot access memory at address 0x170
Code: Pascal
[Select]
[+]
[-]
unit
umain
;
{$mode objfpc}{$H+}
interface
uses
SysUtils
,
Classes
,
httpdefs
,
fpHTTP
,
fpWeb
,
SQLDB
,
DB
,
SQLite3Conn
,
httproute
;
type
{ TFPWebModule1 }
TFPWebModule1
=
class
(
TFPWebModule
)
SQLConnector1
:
TSQLConnector
;
SQLTransaction1
:
TSQLTransaction
;
SQLQuery1
:
TSQLQuery
;
procedure
DoStart
(
ARequest
:
TRequest
;
AResponse
:
TResponse
)
;
private
public
end
;
var
FPWebModule1
:
TFPWebModule1
;
implementation
{$R *.lfm}
{ TFPWebModule1 }
procedure
TFPWebModule1
.
DoStart
(
ARequest
:
TRequest
;
AResponse
:
TResponse
)
;
var
user
:
String
;
begin
user
:
=
ARequest
.
ContentFields
.
Values
[
'user'
]
;
if
user
=
EmptyStr
then
with
AResponse
.
Contents
do
begin
Add
(
'<form action="'
+
ARequest
.
URI
+
'" method="POST"'
)
;
Add
(
'<label for="user">User:</label>'
)
;
Add
(
'<input type="text" name="user" id="user" />'
)
;
Add
(
'<input type="submit" value="Check user" />'
)
;
Add
(
'</form>'
)
;
end
else
begin
with
SQLQuery1
do
begin
Close
(
)
;
Clear
(
)
;
SQL
.
Text
:
=
'SELECT username, password FROM user WHERE username='
+
QuotedStr
(
user
)
;
SQLConnection
.
Connected
:
=
True
;
SQLTransaction
.
Active
:
=
True
;
SQLQuery1
.
Active
:
=
True
;
Open
(
)
;
end
;
if
SQLQuery1
.
RecordCount
=
1
then
AResponse
.
Content
:
=
'user: '
+
user
+
'!'
else
AResponse
.
Content
:
=
'Bad login'
;
end
;
end
;
initialization
RegisterHTTPModule
(
'TFPWebModule1'
,
TFPWebModule1
)
;
HTTPRouter
.
RegisterRoute
(
'*'
,
@
FPWebModule1
.
DoStart
)
;
end
.
«
Last Edit: June 14, 2021, 10:58:59 pm by dasa2
»
Logged
iLya2IK
New Member
Posts: 36
Re: fpweb and sqlquery
«
Reply #1 on:
June 15, 2021, 04:25:23 pm »
I think, that you have not created an instance of the class and are trying to access it.
Look carefully - SQLQuery1 is not even exist
Logged
egsuh
Hero Member
Posts: 1292
Re: fpweb and sqlquery
«
Reply #2 on:
June 16, 2021, 04:04:13 am »
What does
TSQLQuery.Clear
do? Aren't you trying to
SQLQuery1.SQL.Clear;
?
Logged
Print
Pages: [
1
]
« previous
next »
Lazarus
»
Forum
»
Free Pascal
»
Database
(Moderators:
FPK
,
Tomas Hajny
) »
fpweb and sqlquery
TinyPortal
© 2005-2018