Re: simple insert operation

From: Roland Walter <rwa(at)mosaic-ag(dot)com>
To: Aydın Toprak <aydin(dot)toprak(at)intengo(dot)com>
Cc: pgsql-jdbc(at)postgresql(dot)org
Subject: Re: simple insert operation
Date: 2005-09-08 08:23:06
Message-ID: 431FF4EA.7070508@mosaic-ag.com
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Aydın Toprak schrieb:
> Hii guys,
>
> I am very newbie about postgresql and I am making practice,
> however I couldnt been able to insert a simple item to my DB via jdbc...
>
>
> here is my code for insertion...
>
> Class.forName("org.postgresql.Driver");
> String connectionStr = "jdbc:postgresql://localhost:5432/XXXX";
> Connection connection =
> java.sql.DriverManager.getConnection(connectionStr, "XXXX", "XXXX");
> String sqlQuery = "INSERT INTO passTable (idCol , pass) VALUES
> (3, 5)";
> PreparedStatement query = connection.prepareStatement(sqlQuery);
> query.executeUpdate();
> connection.close();
>
> but I cant compile it
>
> the errors
>
> -------------------------------------------------------------------------------------------
>
> form.java:26: unreported exception java.lang.ClassNotFoundException;
> must be cau
> ght or declared to be thrown
> Class.forName("org.postgresql.Driver");
> ^
> form.java:28: unreported exception java.sql.SQLException; must be caught
> or decl
> ared to be thrown
> Connection connection =
> java.sql.DriverManager.getConnection(con
> nectionStr, "XXXX", "XXXX");
>
> ^
> form.java:30: unreported exception java.sql.SQLException; must be caught
> or decl
> ared to be thrown
> PreparedStatement query =
> connection.prepareStatement(sqlQuery);
>
> ^
> form.java:31: unreported exception java.sql.SQLException; must be caught
> or decl
> ared to be thrown
> query.executeUpdate();
> ^
> form.java:32: unreported exception java.sql.SQLException; must be caught
> or decl
> ared to be thrown
> connection.close();
> ^
> 5 errors
> -------------------------------------------------------------------------------------------
>
>
> what is the problem I am stuck with it..
>

The problem is, that all methods mentioned in the error messages
throw exceptions. Exceptions in java must be catched in try-catch-block

try {
method();
...
} catch (ExceptionThrownByMethod e) {
actOnExceptionOrNot();
...

}

You can omit the try-catch-block, if the method sorounding the called
method throws the exception:

void doCallMethod() throws ExceptionThrownByMethod {
method();
...
}

But then you need to catch the Exception at the place where
doCallMethod() is called.

Look in a documentation for the java programming language for more
information.

--
Roland Walter phone: +49 (0) 22 25 / 88 2-41 1
MOSAIC SOFTWARE AG fax: +49 (0) 22 25 / 88 2-20 1
Am Pannacker 3 mailto: rwa (at) mosaic-ag (dot) com
D-53340 Meckenheim http://www.mosaic-ag.com

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