BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to make a SQLDataset component          BorlandTalk.com Forum Index -> comp.lang.pascal.delphi.databases View previous topic :: View next topic   Author Message Carlos Ojea Castro Guest Posted: Fri Feb 13, 2004 8:54 am    Post subject: How to make a SQLDataset component Hello: In kylix3 I made a SQLConnection component (called 'SQLConnection1') to connect to a PostgreSQL database. I started the PostgreSQL server so Object inspector shows 'Connected: True' on that object. Then I made a SQLDataSet component (called 'SQLDataset1'). On 'SQLDataset1' I set SQLConnection to 'SQLConnection1', CommandType to 'ctQuery' and CommandText to 'SELECT * FROM pc104' (pc104 is a valid table name). But now, when I try to make 'SQLDataset1' Active to 'True', I get this error message: Access violation at address 43A92782, accessing address 43B09774 ¿Any idea? Thank you. Regards, Carlos Back to top FrankV Guest Posted: Fri Sep 24, 2004 7:33 pm    Post subject: Re: How to make a SQLDataset component The same problem occur in Mysql. Show "Unable to execute query" why? Francisco Vazquez Back to top FrankV Guest Posted: Fri Sep 24, 2004 8:30 pm    Post subject: Re: How to make a SQLDataset component Same problem occurs with mysql when the active property change true show "Unable to execute query" why? Francisco Vazquez Back to top FrankV Guest Posted: Fri Sep 24, 2004 8:31 pm    Post subject: Re: How to make a SQLDataset component Same problem occurs with mysql when the active property change true show "Unable to execute query" why? Francisco Vazquez Back to top John Kebert Guest Posted: Tue Sep 28, 2004 3:55 pm    Post subject: Re: How to make a SQLDataset component "FrankV" <fvpavp (AT) yahoo (DOT) com.mx> wrote Quote: Same problem occurs with mysql when the active property change true show "Unable to execute query" why? Francisco Vazquez Just guessing - libmysql.dll? What is the SQL? If you are getting access violations, usually that means it is being accessed before it is created. Or freed then accessed. Make sure your datamodule is created *before* the mainform. Put in showmessage('It got to Number 1'), then showmessage('It got to Number 2') in your code to try to find out where it happens. You haven't given us much to go on.... 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