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Top Forums Shell Programming and Scripting Request: How to Parse dynamic SQL query to pad extra columns to match the fixed number of columns Post 302930910 by vikas_trl on Thursday 8th of January 2015 01:52:54 PM
Old 01-08-2015
Request: How to Parse dynamic SQL query to pad extra columns to match the fixed number of columns

Hello All,

I have a requirement in which i will be given a sql query as input in a file with dynamic number of columns. For example some times i will get 5 columns, some times 8 columns etc up to 20 columns.
So my requirement is to generate a output query which will have 20 columns all the times irrespective of number of input columns.

Sample input file
Code:
SELECT
A AS COL1,
COALESCE(B ,'123') AS COL2,
CAST(C AS TIMESTAMP(0)) AS COL3
FROM TABLE
WHERE X = Y AND Z > (SELECT A FROM TABLE2);

Expected output
Code:
SELECT
A AS COL1,
COALESCE(B ,'123') AS COL2,
CAST(C AS TIMESTAMP(0)) AS COL3
,NULL AS COL4
,NULL AS COL5
..
..
,NULL AS COL20
FROM TABLE
WHERE X = Y AND Z > (SELECT A FROM TABLE2);


Can someone one please help me achieve this in UNIX KSH/BASH?

Thanks in Advance
 

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Class::DBI::Query(3pm)					User Contributed Perl Documentation				    Class::DBI::Query(3pm)

NAME
Class::DBI::Query - Deprecated SQL manager for Class::DBI SYNOPSIS
my $sth = Class::DBI::Query ->new({ owner => $class, sqlname => $type, essential => @columns, where_columns => @where_cols, }) ->run($val); DESCRIPTION
This abstracts away many of the details of the Class::DBI underlying SQL mechanism. For the most part you probably don't want to be interfacing directly with this. The underlying mechanisms are not yet stable, and are subject to change at any time. OPTIONS
A Query can have many options set before executing. Most can either be passed as an option to new(), or set later if you are building the query up dynamically: owner The Class::DBI subclass that 'owns' this query. In the vast majority of cases a query will return objects - the owner is the class of which instances will be returned. sqlname This should be the name of a query set up using set_sql. where_clause This is the raw SQL that will substituted into the 'WHERE %s' in your query. If you have multiple %s's in your query then you should supply a listref of where_clauses. This SQL can include placeholders, which will be used when you call run(). essential When retrieving rows from the database that match the WHERE clause of the query, these are the columns that we fetch back and pre-load the resulting objects with. By default this is the Essential column group of the owner class. METHODS
where() $query->where($match, @columns); This will extend your 'WHERE' clause by adding a 'AND $column = ?' (or whatever $match is, isntead of "=") for each column passed. If you have multiple WHERE clauses this will extend the last one. perl v5.12.4 2004-04-25 Class::DBI::Query(3pm)
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