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Full Discussion: Request: How to Parse dynamic SQL query to pad extra columns to match the fixed number of columns
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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LEARN ABOUT CENTOS

isql

isql(1) 						       UnixODBC manual pages							   isql(1)

NAME

       isql, iusql - unixODBC command-line interactive SQL tool

SYNOPSIS

       isql DSN [USER [PASSWORD]] [options]

DESCRIPTION

       isql  is  a  command  line  tool which allows the user to execute SQL in batch or interactively. It has some interesting options such as an
       option to generate output wrapped in an HTML table.

       iusql is the same tool with built-in Unicode support.

ARGUMENTS

       DSN    The Data Source Name, which should be used to make connection to the database.  The data source is looked for in	the  /etc/odbc.ini
	      and $HOME/.odbc.ini files in that order, with the latter overwriting the former.

       USER   Specifies the database user/role under which the connection should be made.

       PASSWORD
	      Password for the specified USER.

OPTIONS

       -b     Run isql in non-interactive batch mode. In this mode, the isql processes its standard input, expecting one SQL command per line.

       -dDELIMITER
	      Delimits columns with delimiter.

       -xHEX  Delimits	columns with HEX, which is a hexadecimal code of the delimiting character in the format 0xNN - i.e. 0x09 for the TAB char-
	      acter.

       -w     Format the result as HTML table.

       -c     Output the names of the columns on the first row. Has any effect only with the -d or -x options.

       -mNUM  Limit the column display width to NUM characters.

       -lLOCALE
	      Sets locale to LOCALE.

       -q     Wrap the character fields in double quotes.

       -3     Use the ODBC 3 calls.

       -n     Use the newline processing.

       -e     Use the SQLExecDirect instead of Prepare.

       -k     Use SQLDriverConnect.

       -v     Turn on the verbose mode, where the errors are fully described. Useful for debugging.

       --version
	      Prints the program version and exits.

COMMANDS

       This section briefly describes some isql runtime commands.

       help
	      List all tables in the database.

       help table
	      List all columns in the table.

       help help
	      List all help options.

EXAMPLES

       $ isql WebDB MyID MyPWD -w -b < My.sql

       Connects to the WebDB as user MyID with password MyPWD, then execute the commands in the My.sql file and returns  the  results  wrapped	in
       HTML table.  Each line in My.sql must contain exactly 1 SQL command, except for the last line, which must be blank (unless the -n option is
       specified).

FILES

       /etc/odbc.ini
	      System-wide DSN definitions. See odbc.ini(5) for details.

       $HOME/.odbc.ini
	      User-specific DSN definitions. See odbc.ini(5) for details.

SEE ALSO

       odbcinst(1), odbc.ini(5)

AUTHORS

       The authors of unixODBC are Peter Harvey <pharvey@codebydesign.com> and Nick Gorham <nick@easysoft.com>. For the full list of  contributors
       see the AUTHORS file.

COPYRIGHT

       unixODBC is licensed under the GNU Lesser General Public License. For details about the license, see the COPYING file.

version 2.3.1							  Tue 25 Jun 2013							   isql(1)
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