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Error creating cursor handle

Posted on 1998-08-13
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Last Modified: 2012-08-13
Hi

I have a query, which are supposed to update all the entries in a table. The tablename is brukertb and is a Paradox table. The field which I try to update, is a logical field which I try to set to be False.
When I try running it, I get the message "Error creating cursor handle"

Here's my code:
 query1.sql.Clear;
 query1.sql.Add ('update brukertb set Def_signatur=False');
 query1.open;

I've tried several things, but can't find out to solve this.
Thanx for all help!
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Question by:bear040497
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Expert Comment

by:viktornet
ID: 1362046
I'm not sure, because I'm not much into DBase, but isn't your code suppose to look like this...
 
  query1.open;
  query1.sql.Clear;
  query1.sql.Add ('update brukertb set Def_signatur=False');

.instead of your way that is

  query1.sql.Clear;
  query1.sql.Add ('update brukertb set Def_signatur=False');
  query1.open;
-------------------

Regards,
Viktor Ivanov
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Accepted Solution

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333 earned 100 total points
ID: 1362047
bear,
when you execute SELECT statement, you must use Query1.Open or Query1.Active=True. When you execute UPDATE, INSERT, DELETE, etc., you must use Query1.ExecSql. So your code must look like this:

Query1.Sql.Clear;
Query1.Sql.Add('update brukertb set Def_signatur=False');
Query1.ExecSql;

AP
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Expert Comment

by:333
ID: 1362048
P.S.
Viktor, Query.Open executes Sql statement. If Sql property is emty, Query.Open fails.

AP
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LVL 10

Expert Comment

by:viktornet
ID: 1362049
As I said I still don't know much abouy DBase, but doesn't a person have to open first a query, before he starts clearing, reading and stuff...???

Regards,
Viktor Ivanov
0
 
LVL 2

Expert Comment

by:333
ID: 1362050
Viktor,
I just say that when you call Query.Open, Delphi automaticaly executes SQL, posted in Query.Sql. If you are use TTable, then yes, you must first open table and then do what you want. But in Query it's a little different. So if you want to open whole database with Query, you must type something like this:

Query.Sql.Add('select * from mydb');  {all records of mydb database}
Query.Open;
{This 2 lines are like Table.Open}

But if you type

Query.Sql.Add('select * from mydb');  {all records of mydb database}
Query.Open;

you will see error 'No SQL statement available'. You can try this.

{ just trying to explain a little :) }
AP
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Author Comment

by:bear040497
ID: 1362051
This example worked great!
Thanx a lot for your help!
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