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Full Discussion: Need inputs on UNIX script basics
Top Forums Shell Programming and Scripting Need inputs on UNIX script basics Post 302487445 by ustechie on Wednesday 12th of January 2011 02:13:47 PM
Old 01-12-2011
How to extract entire WHERE clause from a SQL using UNIX
Hi UNIX Gurus,

I have a SQL utility which fires DML statements against DB2 tables. Logic is to identify DML statements, put it into a file ($dml) and execute the job.

DML file can have more than 1 DML statements....but all of 1 type at a time.....either all UPDATE or all DELETE.

Job first check the count which is the records impacted by each DML statement. This was a pre-requisite condition.

So I used following code. It works fine for normal UPDATE/DELETE queries, but not fetching exact WHERE clause where we have in-queries.


Code:
sed 's/.*\([wW][hH][eE][rR][eE] .*$\)/\1/' $dml > $temp1 --> Selecting the WHERE clause of the DML mentioned in file $dml and put it in a temp file, temp1
sed "s/[wW][hH][eE][rR][eE]/select count(*) from $SCH.$TBL where/" $temp1 > $ddl --> use the WHERE clause mentioned in the temp file temp1 and creates SELECT COUNT(*) statement and put it in $ddl file
rm $temp1--> Remove temp file temp1


Example of DML statement for which I was executing it but it was not working correctly:

Code:
UPDATE 
<TABLE_NAME> 
SET 
<FIELD_NAME> = VALUE 
WHERE 
CONDITION_1 AND 
CONDITION_2 = (SELECT FIELD_NAME FROM TABLE_NAME WHERE CONDITION_XYZ);

P.S. - Format mentioned in above query is not fixed. It may be mentioned in 1 line or in multiple lines just like above. Also it can have more than 1 DML statement in input file.

Thanks in advance....
Beginner in UNIX

---------- Post updated at 02:13 PM ---------- Previous update was at 12:56 PM ----------

Is there anyone who can help me in resolving this?
Last edited by ustechie; 01-12-2011 at 04:07 PM..
 

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LEARN ABOUT OSX

execute

EXECUTE(7)                                                         SQL Commands                                                         EXECUTE(7)

NAME

       EXECUTE - execute a prepared statement

SYNOPSIS

       EXECUTE name [ ( parameter [, ...] ) ]

DESCRIPTION

       EXECUTE  is  used  to execute a previously prepared statement. Since prepared statements only exist for the duration of a session, the pre-
       pared statement must have been created by a PREPARE statement executed earlier in the current session.

       If the PREPARE statement that created the statement specified some parameters, a compatible set of parameters must be passed to the EXECUTE
       statement,  or  else an error is raised. Note that (unlike functions) prepared statements are not overloaded based on the type or number of
       their parameters; the name of a prepared statement must be unique within a database session.

       For more information on the creation and usage of prepared statements, see PREPARE [prepare(7)].

PARAMETERS

       name   The name of the prepared statement to execute.

       parameter
              The actual value of a parameter to the prepared statement. This must be an expression yielding a value that is compatible  with  the
              data type of this parameter, as was determined when the prepared statement was created.

OUTPUTS

       The command tag returned by EXECUTE is that of the prepared statement, and not EXECUTE.

EXAMPLES

       Examples are given in the Examples [prepare(7)] section of the PREPARE [prepare(7)] documentation.

COMPATIBILITY

       The  SQL  standard includes an EXECUTE statement, but it is only for use in embedded SQL. This version of the EXECUTE statement also uses a
       somewhat different syntax.

SEE ALSO

       DEALLOCATE [deallocate(7)], PREPARE [prepare(7)]

SQL - Language Statements                                           2010-05-14                                                          EXECUTE(7)
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