Re: Problem with getImportedKeys / getExportedKeys

Jeroen,

Thanks for the great test case, I will have a look as soon as possible.

Dave

-----Original Message-----
From: pgsql-jdbc-owner(at)postgresql(dot)org
[mailto:pgsql-jdbc-owner(at)postgresql(dot)org] On Behalf Of Vianen, Jeroen van
Sent: Monday, January 14, 2002 8:06 AM
To: pgsql-jdbc
Subject: [JDBC] Problem with getImportedKeys / getExportedKeys

Hi,

I have a problem with the getImportedKeys() / getExportedKeys() pair in
current JDBC sources.

Given the following data model:

create table users (
userid integer not null,
username varchar(50) not null,
password varchar(50) not null,
name1 varchar(20) not null,
name2 varchar(10),
name3 varchar(40) not null,
email varchar(50) not null,
--
constraint pk_users primary key (userid)
);

create table roles (
rolename varchar(5) not null,
description varchar(50) not null,
--
constraint pk_roles primary key (rolename)
);

create table users_roles (
userid integer not null,
rolename varchar(5) not null,
--
constraint pk_users_roles primary key (userid, rolename),
constraint fk_users_roles__userid foreign key (userid) references
users(userid),
constraint fk_users_roles__rolename foreign key (rolename)
references
roles(rolename)
);

I.e. the following datamodel

+-------+ +-------------+ +-------+
| users |-----<| users_roles |>-----| roles |
+-------+ +-------------+ +-------+

and the following Java application (TestKeys.java):

import java.sql.*;

public class TestKeys {
static public void main(String[] args) {
if (args.length > 0) {
String table = args[0].toUpperCase();
Connection conn = null;
try {
Class.forName("org.postgresql.Driver");
conn =
DriverManager.getConnection("<YOUR_URL_HERE>", "<USERNAME>",
"<PASSWORD>");
DatabaseMetaData dbmd =
conn.getMetaData();

System.out.println("Imported keys:");
ResultSet rs =
dbmd.getImportedKeys(null,
null, table);
while (rs.next()) {
System.out.println("PKTABLE_NAME
= "
+ rs.getString("PKTABLE_NAME"));

System.out.println("PKCOLUMN_NAME =
" + rs.getString("PKCOLUMN_NAME"));
System.out.println("FKTABLE_NAME
= "
+ rs.getString("FKTABLE_NAME"));

System.out.println("FKCOLUMN_NAME =
" + rs.getString("FKCOLUMN_NAME"));
}
rs.close();

System.out.println("Exported keys:");
rs = dbmd.getExportedKeys(null, null,
table);
while (rs.next()) {
System.out.println("PKTABLE_NAME
= "
+ rs.getString("PKTABLE_NAME"));

System.out.println("PKCOLUMN_NAME =
" + rs.getString("PKCOLUMN_NAME"));
System.out.println("FKTABLE_NAME
= "
+ rs.getString("FKTABLE_NAME"));

System.out.println("FKCOLUMN_NAME =
" + rs.getString("FKCOLUMN_NAME"));
}
rs.close();
conn.close();
} catch (Exception ex) {
ex.printStackTrace(System.err);
}
System.exit(0);
} else {
System.err.println("Please specify a
tablename");
}
}
}

In Oracle I get:

# java -classpath classes12.zip:. TestKeys users
Imported keys:
Exported keys:
PKTABLE_NAME = USERS
PKCOLUMN_NAME = USERID
FKTABLE_NAME = USERS_ROLES
FKCOLUMN_NAME = USERID

# java -classpath classes12.zip:. TestKeys users_roles
Imported keys:
PKTABLE_NAME = ROLES
PKCOLUMN_NAME = ROLENAME
FKTABLE_NAME = USERS_ROLES
FKCOLUMN_NAME = ROLENAME
PKTABLE_NAME = USERS
PKCOLUMN_NAME = USERID
FKTABLE_NAME = USERS_ROLES
FKCOLUMN_NAME = USERID
Exported keys:

In PostgreSQL 7.2 (current sources) I get:

# java -classpath jdbc7.2dev-1.2.jar:. TestKeys users
Imported keys:
Exported keys:

# java -classpath jdbc7.2dev-1.2.jar:. TestKeys users_roles Imported
keys: Exported keys:

As might be guessed, Oracle is right here, and PostgreSQL is not. I do
recall that this once worked in a previous version of the 7.2
development sources.

Any clue?

Jeroen

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