How to execute db2 query from a unix shell script

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

sohan - 13 Dec 2006 05:28 GMT

Hi,

I want to know how to connect and execute a db2 query from inside a
UNIX shell script.

Details: We have a unix shell script. We need to execute multiple db2
sql queries from this shell script and export the result to a file.

Any code snippet on this will be helpful.

Thanks,
Sohan

Reply to this Message

Brian Tkatch - 13 Dec 2006 05:47 GMT

> Hi,
>
[quoted text clipped - 8 lines]
> Thanks,
> Sohan

db2 <command>

Most likely, you want to quote the command.

To see how to export to a file, strip headers, or the like, see the
Command Reference, and the list of options.

B.

Reply to this Message

sohan - 13 Dec 2006 08:16 GMT

THanks Brian.

So now I have written the following shell script to connect to a db2
database and execute a query. Is there any better way / alternate way
of doing this?

#!/usr/bin/ksh

db2 +t connect to <dbname>;

SQLSTMT=/tmp/$0.$$.tmp
echo $SQLSTMT
cat <<EOF > $SQLSTMT
set schema ADMIN;
EXPORT TO x.unl OF DEL MODIFIED BY NOCHARDEL

select * from store;
EOF
db2 -txf $SQLSTMT
echo $?

Thanks,
Sohan
P.S. I am new to db2 and UNIX.

> > Hi,
> >
[quoted text clipped - 17 lines]
>
> B.

Reply to this Message

Knut Stolze - 13 Dec 2006 09:58 GMT

> THanks Brian.
>
[quoted text clipped - 16 lines]
> db2 -txf $SQLSTMT
> echo $?

Looks good. You probably want to remove the temp file afterwards, though.

If your SQL statements are not too complex, you can also do this:

#!/bin/sh

db2 "CONNECT TO <dbname>"

db2 "SET SCHEMA = admin"
db2 "EXPORT TO x.unl OF DEL MODIFIED BY NOCHARDEL SELECT * FROM store"

Signature

Knut Stolze
DB2 z/OS Utilities Development
IBM Germany

Reply to this Message

Brian Tkatch - 13 Dec 2006 14:57 GMT

> THanks Brian.
>
[quoted text clipped - 42 lines]
> >
> > B.

Instead of cat to a file and running the file, the statement itself can
be used:

db2 -txf <<EOF > $SQLSTMT
set schema ADMIN;
EXPORT TO x.unl OF DEL MODIFIED BY NOCHARDEL select * from store;
EOF

Of course, if only one statement is used, the SET SCHEMA is extraneous,
and the schema could be mentioned as part of the TABLE name. This would
make it one statement, and obviate the need for a here-document.

db2 -tx "EXPORT TO x.unl OF DEL MODIFIED BY NOCHARDEL select * from
ADMIN.store;"

Of course, the asterisk may then cause globbing issues, so it needs to
be escaped, or the statement needs to be quoted. Further, with one
statement, the semi-colon is redundant, making the most efficient
statement:

db2 -x EXPORT TO x.unl OF DEL MODIFIED BY NOCHARDEL select \* from
ADMIN.store

If you are looking to automate exporting and loading multiple TABLE, i
just wrote a script to do that (with some very kind help from this
newsgroup).

B.

Reply to this Message

teckguan - 26 Dec 2007 03:13 GMT

Hi Brian,

I am still new to db2 and not really understand the coding part.

db2 -txf <<EOF > $SQLSTMT
set schema ADMIN;
EXPORT TO x.unl OF DEL MODIFIED BY NOCHARDEL select * from store;
EOF

I have a few questions that I hope that you can help me by explaining it.
Thanks.
1. If I have several tables to be executed through Shell scripts, can I use
the same command?
2. For $SQLSTMT in the coding, I would like to ask is that the database name?

3. For << EOF > in the coding, may I know what is the meaning of it?

Thanks.

Regards,
Teck Guan.

>> THanks Brian.
>>
[quoted text clipped - 30 lines]
>
>B.

Reply to this Message

Hemant Shah - 14 Dec 2006 02:05 GMT

print -R "CONNECT TO ${DB2DBDFT};
DROP TABLE ${SCHEMANAME}.TABLE1;
DROP TABLE ${SCHEMANAME}.TABLE2;
DROP TABLE ${SCHEMANAME}.TABLE3;
TERMINATE;" | db2 +p -t

> Hi,
>
[quoted text clipped - 8 lines]
> Thanks,
> Sohan

Signature

Hemant Shah /"\ ASCII ribbon campaign
E-mail: NoJunkMailshah@xnet.com \ / ---------------------
X against HTML mail
TO REPLY, REMOVE NoJunkMail / \ and postings
FROM MY E-MAIL ADDRESS.
-----------------[DO NOT SEND UNSOLICITED BULK E-MAIL]------------------
I haven't lost my mind, Above opinions are mine only.
it's backed up on tape somewhere. Others can have their own.

Reply to this Message

Knut Stolze - 14 Dec 2006 08:50 GMT

> print -R "CONNECT TO ${DB2DBDFT};

You should have pointed out that "print" is not necessarily a regular Unix
and/or shell command.

> DROP TABLE ${SCHEMANAME}.TABLE1;
> DROP TABLE ${SCHEMANAME}.TABLE2;
> DROP TABLE ${SCHEMANAME}.TABLE3;
> TERMINATE;" | db2 +p -t

Signature

Knut Stolze
DB2 z/OS Utilities Development
IBM Germany

Reply to this Message

sohan - 14 Dec 2006 11:25 GMT

Thanks for all the responses.
One more question, to connect to a db2 database in the same UNIX server
we can use:

db2 connect to <dbname> USer <name> using <pwd>

Now if the db2 server is in differrent server where/how do we specify
the server name or its ip address?

Thanks,
Sohan

> > print -R "CONNECT TO ${DB2DBDFT};
>
[quoted text clipped - 5 lines]
> > DROP TABLE ${SCHEMANAME}.TABLE3;
> > TERMINATE;" | db2 +p -t

Reply to this Message

Ian - 14 Dec 2006 14:04 GMT

> Now if the db2 server is in differrent server where/how do we specify
> the server name or its ip address?

That is configured when you catalog the database (i.e. the DB2 client
must be installed on the machine)

Reply to this Message

Hemant Shah - 14 Dec 2006 14:21 GMT

Sorry about that, I should have mentioned that it is a Korn shell command.

>> print -R "CONNECT TO ${DB2DBDFT};
>
[quoted text clipped - 5 lines]
>> DROP TABLE ${SCHEMANAME}.TABLE3;
>> TERMINATE;" | db2 +p -t

Signature

Reply to this Message