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From: Laurenz Albe <[email protected]>
To: [email protected]
To: [email protected]
Cc: [email protected]
Subject: Fwd: PostgreSQL JDBC 42.7.5 returns an unexpected catalog name
Date: Sat, 29 Mar 2025 17:21:09 +0100
Message-ID: <[email protected]> (raw)
References: <DM6PR15MB4107ADBFB245342C6A6AA03FB4A02@DM6PR15MB4107.namprd15.prod.outlook.com>

I think this belongs here.

-------- Forwarded Message --------
From: Vinhson Nguyen <[email protected]>
To: [email protected] <[email protected]>
Cc: [email protected] <[email protected]>

1) Problem Description:  
When upgrading our application to a new PostgreSQL JDBC driver 42.7.5 (from 42.7.4), we got an expected catalog name in the result set returned by DatabaseMetadata.getSchemas().

Expected catalog name:  null (42.7.4) 
Unexpected catalog name:  dbcert (42.7.5)

2) Connection Info:
URL used:
jdbc:postgresql://cteds721.fyre.ibm.com:54172/dbcert

Driver name/Version:
org.postgresql.Driver/postgresql-42.7.5.jar

userID/pw: dbcert1/***********

3) Attachements:
a) PG_JDBC_42_7_4.PNG:  Screenshot showing an expected catalog name (null) with driver version 42.7.4.
b) PG_JDBC_42_7_5.PNG:  Screenshot showing an unexpected catalog name (dbcert) with driver version 42.7.5.
c) ImportTest.java:  Java test program used in (a) and (b).

If you need any additional details, please let me know.

Thank you in advance!
Vinhson Nguyen


Attachments:

  [text/x-java] ImportTest.java (1.9K, 2-ImportTest.java)
  download | inline:
package TD;

import java.io.FileWriter;
import java.io.IOException;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;

import java.sql.SQLException;

public class ImportTest {
	public static void main(String[] args) {
		System.out.println("\nStarting main ImportTest... ");
		FileWriter fw = null;
		String outputFileName = "C:\\temp\\mdOutput.txt";
		try {
			fw = new FileWriter(outputFileName, false);
		} catch (IOException e) {
			System.out.println(e);
		}
		
		Connection conn = null;
		
		conn = connectDB();
		// Processing metadata
		try {
			DatabaseMetaData dmd = conn.getMetaData();
			System.out.println("\ngetDriverName = " + dmd.getDriverName());
			System.out.println("\ngetDriverVersion = " + dmd.getDriverVersion());
			System.out.println("\ngetDatabaseProductName = " + dmd.getDatabaseProductName());
			System.out.println("\ngetDatabaseProductVersion = " + dmd.getDatabaseProductVersion());
			
			ResultSet schemas = dmd.getSchemas();
			while (schemas.next()) {
				String schemaName = schemas.getString(1);
				String catName = schemas.getString(2);
				System.out.println("\ncatalog = " + catName + " schema = " + schemaName);
			}
		} catch (SQLException e) {
			System.out.println(e);
		}
		try {
			conn.close();
		} catch (SQLException e) {
			System.out.println(e);
		}

		try {
			fw.close();
		} catch (IOException ioe) {
			System.out.println(ioe);
		}

		System.out.println("\nEnding main ImportTest...");
	}
	
	public static Connection connectDB() {
		Connection tdCon = null;
		try {
			Class.forName("org.postgresql.Driver");
			String url = "jdbc:postgresql://cteds721.fyre.ibm.com:54172/dbcert";
			String userID = "dbcert1";
			String pw = "Cognos_1";
			tdCon = DriverManager.getConnection(url, userID, pw);
		} catch (SQLException eSQL) {
			System.out.println(eSQL);
		} catch (Exception eClassNotFound) {
			System.out.println(eClassNotFound);
		}
		return tdCon;
	}
}

  [image/png] PG_JDBC_42_7_4.PNG (166.3K, 3-PG_JDBC_42_7_4.PNG)
  download | view image

  [image/png] PG_JDBC_42_7_5.PNG (167.9K, 4-PG_JDBC_42_7_5.PNG)
  download | view image

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