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Today's Topics:
1. List of schemas and tables via JDBC? (James H. H. Lampert)
2. RE: List of schemas and tables via JDBC? (Dan Kimmel)
3. Re: List of schemas and tables via JDBC? (Brian Johnson)
4. Re: List of schemas and tables via JDBC? (James H. H. Lampert)
5. Re: List of schemas and tables via JDBC? (Sam_L)
----------------------------------------------------------------------
message: 1
date: Thu, 29 Aug 2013 17:34:35 -0700
from: "James H. H. Lampert" <jamesl@xxxxxxxxxxxxxxxxx>
subject: List of schemas and tables via JDBC?
I haven't even started looking, but would anybody happen to know where I
need to look, for how one gets a list of databases/schemas/tables
available at any given JDBC URL?
And are the relevant methods already exposed in JDBCR4?
(I'm beginning to think that by the time I'm done with extensions to
JDBCR4, it will be more like JDBCR4000.)
--
JHHL
------------------------------
message: 2
date: Fri, 30 Aug 2013 14:46:38 +0000
from: Dan Kimmel <dkimmel@xxxxxxxxxxxxxxx>
subject: RE: List of schemas and tables via JDBC?
There's a pretty good explanation here
https://www.simple-talk.com/sql/t-sql-programming/exploring-your-database-schema-with-sql/though it focuses on SQL Server.
E F Codd's fifth rule (rule no. 4) says that to be a relational database a
system must have a catalog of its parts that can be queried using the same
language used for querying ordinary tables. This "schema" was standardized
in SQL-98, I think, with a standard meta-schema name "INFORMATION_SCHEMA"
and tables within that schema "TABLES", "TABLE-CONSTRAINTS", "VIEWS",
"TRIGGERS", and so on. See here for a good list
http://dev.mysql.com/doc/refman/5.0/en/information-schema.html. Before
that all the databases supported the systables, sysviews, sysconstraints,
etc. de facto naming convention.
So, the JDBC standard doesn't need to provide any methods for querying for
a list of schemas as SQL itself already has defined them.
-----Original Message-----list
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-
bounces@xxxxxxxxxxxx] On Behalf Of James H. H. Lampert
Sent: Thursday, August 29, 2013 7:35 PM
To: 'Java Programming on and around the IBM i'
Subject: List of schemas and tables via JDBC?
I haven't even started looking, but would anybody happen to know where I
need to look, for how one gets a list of databases/schemas/tables
available at any given JDBC URL?
And are the relevant methods already exposed in JDBCR4?
(I'm beginning to think that by the time I'm done with extensions to
JDBCR4, it will be more like JDBCR4000.)
--
JHHL
--
This is the Java Programming on and around the IBM i (JAVA400-L) mailing
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------------------------------
message: 3
date: Fri, 30 Aug 2013 10:04:37 -0500
from: Brian Johnson <brian.johnson.mn@xxxxxxxxx>
subject: Re: List of schemas and tables via JDBC?
And here's i-specific info (presumably also available in newer
infocenters):
http://publib.boulder.ibm.com/infocenter/iseries/v5r4/topic/db2/rbafzmstcatalog.htm
On Fri, Aug 30, 2013 at 9:46 AM, Dan Kimmel <dkimmel@xxxxxxxxxxxxxxx>
wrote:
There's a pretty good explanation herehttps://www.simple-talk.com/sql/t-sql-programming/exploring-your-database-schema-with-sql/though it focuses on SQL Server.
...
-----Original Message-----
From: java400-l-bounces@xxxxxxxxxxxx [mailto:java400-l-
bounces@xxxxxxxxxxxx] On Behalf Of James H. H. Lampert
Sent: Thursday, August 29, 2013 7:35 PM
To: 'Java Programming on and around the IBM i'
Subject: List of schemas and tables via JDBC?
I haven't even started looking, but would anybody happen to know where I
need to look, for how one gets a list of databases/schemas/tables
available at any given JDBC URL?
Brian Johnson
brian.johnson.mn@xxxxxxxxx
------------------------------
message: 4
date: Fri, 30 Aug 2013 08:37:28 -0700
from: "James H. H. Lampert" <jamesl@xxxxxxxxxxxxxxxxx>
subject: Re: List of schemas and tables via JDBC?
On 8/30/13 7:46 AM, Dan Kimmel wrote:
. . .
E F Codd's fifth rule (rule no. 4) says that to be a relational. . .
database a system must have a catalog of its parts that can be
queried using the same language used for querying ordinary tables.
So, the JDBC standard doesn't need to provide any methods for
querying for a list of schemas as SQL itself already has defined
them.
Fascinating!
Or to quote an old exchange between Groucho and Margaret Dumont,
"I'm fascinated!"
"I'm fascinated too. Right here on the arm."
--
JHHL
------------------------------
message: 5
date: Fri, 30 Aug 2013 12:03:57 -0400
from: Sam_L <lennon_s_j@xxxxxxxxxxx>
subject: Re: List of schemas and tables via JDBC?
JDBC API Tutorial and Reference, Third Edition, by Fisher, Ellis and
Bruce has a chapter on Database Metadata. (If I ever get time I plan to
read more of this book and do some experimentation with Java.)
I'm not an expert, but they have some Java sample code (con is a
Connection object):
DatabaseMetaData dbmd = con.getMetaData(0;
ResultSet rs = dbmd.getSchemas();
while (rs.next());
String s = rs.getString(1);
System.out.println("Schema name = " + s);
}
It looks like there is a boatload of information in the metadata object.
I picked up a copy of the book a couple of years ago used (read cheap)
on e-bay. You might find it useful.
Sam
On 8/29/2013 8:34 PM, James H. H. Lampert wrote:
I haven't even started looking, but would anybody happen to know where I
need to look, for how one gets a list of databases/schemas/tables
available at any given JDBC URL?
And are the relevant methods already exposed in JDBCR4?
(I'm beginning to think that by the time I'm done with extensions to
JDBCR4, it will be more like JDBCR4000.)
--
JHHL
------------------------------
--
This is the Java Programming on and around the IBM i (JAVA400-L) digest
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End of JAVA400-L Digest, Vol 11, Issue 70
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