Re: [JDBC] next() and PreparedStatement
Hi Mano, No the problem is not with jdbc. I do see a couple of things though 1) the semi-colon isn't necessary, but shouldn't break the code? try removing it. 2) returning the row that way looks a little dangerous. It is possible that the statement associated with the row would be gone after returning. dave On Tue, 2001-08-28 at 07:13, Mano lito wrote: Hi! We are developing a project using PostgreSQL 7.1.2 and JDBC drivers to exchange information with the database. Here is a piece of code to explain our problem: --- PreparedStatement pstmt; Connection connection; ResultSet rs = null; String query = new String( SELECT count(*) FROM foo_table WHERE foo_code=?; ); pstmt = connection.prepareStatement( query ); pstmt.setString( 1, foo ); rs = pstmt.executeQuery( query ); pstmt.close(); return rs.next(); -- the next() method will cause a java.lang.NullPointerException when the ResultSet comes from a PreparedStatement!!! Is this problem originated by the JDBC driver? We downloaded it from jdbc.fastcrypt.com but this error occurs again and again and in jdbc.postgresql.org we see 7.0.x drivers available but none 7.1 nor 7.1.2 exists... We'd appreciate any help you could give us.If your address is not the correct place to ask this questions please tell us. Thanks in advance. _ Descargue GRATUITAMENTE MSN Explorer en http://explorer.msn.es/intl.asp ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED] ---(end of broadcast)--- TIP 6: Have you searched our list archives? http://www.postgresql.org/search.mpl
RE: [JDBC] next() and PreparedStatement
i believe that when you close the stmt, the rs is automatically closed. you have to leave the stmt open until you're done with the rs. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Mano lito Sent: Tuesday, August 28, 2001 7:14 AM To: [EMAIL PROTECTED] Subject: [JDBC] next() and PreparedStatement Hi! We are developing a project using PostgreSQL 7.1.2 and JDBC drivers to exchange information with the database. Here is a piece of code to explain our problem: --- PreparedStatement pstmt; Connection connection; ResultSet rs = null; String query = new String( SELECT count(*) FROM foo_table WHERE foo_code=?; ); pstmt = connection.prepareStatement( query ); pstmt.setString( 1, foo ); rs = pstmt.executeQuery( query ); pstmt.close(); return rs.next(); -- the next() method will cause a java.lang.NullPointerException when the ResultSet comes from a PreparedStatement!!! Is this problem originated by the JDBC driver? We downloaded it from jdbc.fastcrypt.com but this error occurs again and again and in jdbc.postgresql.org we see 7.0.x drivers available but none 7.1 nor 7.1.2 exists... We'd appreciate any help you could give us.If your address is not the correct place to ask this questions please tell us. Thanks in advance. _ Descargue GRATUITAMENTE MSN Explorer en http://explorer.msn.es/intl.asp ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED] ---(end of broadcast)--- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
