sql transaction in bash linux

Hi,
I have a function in shell script which executes sql statements.
I want to use transactions for it.

function()
{
Begin transaction # i want SQL equivalent of this in shell scripting

source /etc/ipaccess/omcr-server/ipaccess-omcr;
mysql -u${MYSQL_ROOT_USER} -p${MYSQL_ROOT_PASSWORD} -e "Delete from omcr.AlarmNotification where alarmLifecycleId=50;"
 
commit transaction # i want SQL equivalent of this in shell scripting
}

How to execute the lines for "Begin transaction" and "commit"?????????
pvinodpAsked:
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mwiercinConnect With a Mentor Commented:
Hi,

The simplest way would be to concatenate all the queries together delimited with semi colon (you can also USE mysql's DELIMITER keyword to  change it).  You can use a temp file for doing so, or combine use of SOURCE  command, i.e.

$ mysql -u${MYSQL_ROOT_USER} -p${MYSQL_ROOT_PASSWORD} -e "BEGIN; SOURCE /etc/ipaccess/omcr-server/ipaccess-omcr; Delete from omcr.AlarmNotification where alarmLifecycleId=50; COMMIT;"

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If you want to maintain more control over execution, (named) pipes would be the way to go.

One way communication using a pipe:

$ (echo "SELECT NOW(); SELECT CONNECTION_ID(); "; sleep 1; echo "SELECT NOW();SELECT CONNECTION_ID();" ) | mysql
NOW()
2011-03-03 13:20:13
CONNECTION_ID()
2865
NOW()
2011-03-03 13:20:14
CONNECTION_ID()
2865

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Named pipes (mypipe being MySQL entry, outpipe - output).:
$ cat mypipe |  mysql  > outpipe &
[1] 17660
$ echo "SELECT NOW();" > mypipe; cat outpipe;
NOW()
2011-03-03 13:30:03
[1]+  Done                    cat mypipe | mysql > outpipe
$

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You can also use socat in similar manner as above.

I don't recommend making it too complicated as handling both output and input  streams in bash will mean that you are effectively implementing your own database driver, thus if you need more control it's better to use a proper driver (mean switch to Perl/PHP/Python/Ruby etc.).
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RealRavenConnect With a Mentor Commented:
Sorry, I don't think that is possible. Each connection to mysql will loose it's transactions on disconnect and it's not possible to first start a transaction, then connect again and do something and then connect a third time and do commit or rollback.

But if your example is complete and all you want to do is run ONE delete you'll have an automatic transaction around it whether you like it or not.
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pvinodpAuthor Commented:
hi raven
the function() contains multiple SQL statements.
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woolmilkporcConnect With a Mentor Commented:
You could put all your statements (including begin/commit) into a textfile to be read by mysql, like

mysql -u${MYSQL_ROOT_USER} -p${MYSQL_ROOT_PASSWORD} < /text/file

wmp
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RealRavenCommented:
As woolmilkporc points out a script file is always possible but it doesn't look like a good solution in this case.

You would have to write to a temporary file, send that to mysql and then delete it. It's possible but not pretty.
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pvinodpAuthor Commented:
Thanks all.
Finally i did put in the solution by mwiercin :

$ mysql -u${MYSQL_ROOT_USER} -p${MYSQL_ROOT_PASSWORD} -e "BEGIN; SOURCE /etc/ipaccess/omcr-server/ipaccess-omcr; Delete from omcr.AlarmNotification where alarmLifecycleId=50; COMMIT;"
[/code]
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