Le May 28, 2008 à 9:38 PM, Michael Van Canneyt a écrit : > > > On Thu, 29 May 2008, peng wrote: > >> Hellow everyone: >> >> I encountered an error when Postgresql in connection with Lazarus, >> as >> follows. >> >> My environment is window xp Chinese , the installation of the >> Lazzrus 0.924 >> and Postgresql 8.3 . Lazarus can run and compile unit, the >> Postgresql can >> use pgadmin III visit. I created an data table "xiang" in the default >> database "postgres", including Chinese and English characters, >> Encoded by >> the uft8. and then copy the libpq.dll and other files to the >> Windows system >> directory. Next steps are: >> >> 1, Lazarus creat a new form; >> 2, placing a TPQconnection components to the form; >> 3, setting the component attributes. For example: >> Hostname = localhost >> DatabaseName = postgres >> UserName = postgres >> Password = 1234 >> Name = PQConnection1 >> Params = "select * from xiang" > > Params should be empty; this is not to enter a SQL statement. > > To execute a query, drop a TSQLQuery on the form (SQLQuery1, for > example), > and set > SQLQuery1.SQL.Text:='select * from xiang'; > > and connect it to the connection component: > > SQLQuery1.Database:=PQConnection1; > > Then drop a TSQLTransaction (SQLTransaction1) on the form. > Connect it to the database as well: > SQLTransaction1.Database:=PQConnection1; > > and finally connect the SQLQuery1 to the transaction: > > SQLQuery1.Transaction:=SQLTransaction1; > > Now set > > PQConnection1.Connected:=True; > > and then > > SQLQuery1.Active:=True; > > And then your query will be executed. > > To use SQLDB, you need always 3 components: > > 1. A TSQLConnection component. > This controls the connection to the database. > > 2. A TSQLTransaction component. > This controls the transaction in which a query is executed. > It is connected to the TSQLConnection. > > 3. A TSQLQuery component. > This executes queries. > It is connected to the TSQLConnection component (the database) > and the TSQLTransaction (the transaction context).
May be this text should be added somewhere in the wiki ? -- Damien Gerard [EMAIL PROTECTED] "Intelligence is 10 million rules." -- Douglas Lenat _______________________________________________ Lazarus mailing list Lazarus@lazarus.freepascal.org http://www.lazarus.freepascal.org/mailman/listinfo/lazarus