Extracting select queries from script Post: 302184023

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Top Forums Shell Programming and Scripting Extracting select queries from script Post 302184023 by helper on Thursday 10th of April 2008 10:16:10 AM

04-10-2008

Registered User

Use SED command to do the need.

First of all i dont think u need any scripts..
U can do with a single line command along with pipes
Here is the command

sed '/;/G' test | grep "SELECT" | sed -e :a -e '$!N;s/\n/~/g;ta' | tr "~" "\n" >> targetfile

INPUT FILE : test
OUTPUT FILE : targetfile

Assumptions :
*************
1. The input file doesnt have any blank lines.
2. If it has then use the following sed command
sed '/^$/d' <sourcefile> <targetfile>

Here is my input file
cat test
1 SELECT * FROM DUAL;
2 SELECT A B C D E F G H I A B C D E F G H IA B C D E F G H I A B C D E F G H I A B C D E F G H I A B C D E F G H I A B C D E F G H I A B C D E F G H I ;
3 SELECT A B C D E F G H I A B C D E F G H IA B C D E F G H I A B C D E F G H I A B C D E F G H I A B C D E F G H I A B C D E F G H
I A B C D IN ( SELECT A B C D E F G H I A B C D E F G H IA B C D E F G H I A B C D E F G H I );
4 ASDFASDFASDFASDFSAD
5 SELECT A B C D E F G H I A B C D E F G H IA B C D E F G H I A B C D E F G H I A B C D E F G H I A B
I A B C D IN ( SELECT A B C D E F G H I A B C D E F G H IA B C D E F G H I A B C D E F G H I );

THINGS THAT ARE TAKEN CARE OFF :
*********************************
1. There might be a single SELECT STATEMENT (no sub-queries).
2. There might be sub-queries which are written continiously (without breaking)
3. There might be sub-queries which are written in different statements.

Now the command :
sed '/;/G' test | grep "SELECT" | sed -e :a -e '$!N;s/\n/~/g;ta' | tr "~" "\n" >> targetfile

Explanation of the commands :
*****************
***sed '/;/G' test ***
*****************

This inserts a new line after the end of a complete SQL statment ie. when it encounters a ";" it inserts a line after it.

*****************
***grep "SELECT" ***
*****************
The output of the command sed '/;/G' test is piped and only the SELECT queries are grepped from that.

********************************
****sed -e :a -e '$!N;s/\n/~/g;ta'******
********************************

The output of the previous command sed '/;/G' test | grep "SELECT" is sent as input to the above command. This is manily done becoz if there are queries which span more than one line which is not continuous. (they might have pressed enter key and continued)

**************
***tr "~" "\n"***
**************
This will replace all "~" characters to "\n"
sed '/;/G' test | grep "SELECT" | sed -e :a -e '$!N;s/\n/~/g;ta' | tr "~" "\n"
1 SELECT * FROM DUAL;
2 SELECT A B C D E F G H I A B C D E F G H IA B C D E F G H I A B C D E F G H I A B C D E F G H I A B C D E F G H I A B C D E F G H I A B C D E F G H I ;
3 SELECT A B C D E F G H I A B C D E F G H IA B C D E F G H I A B C D E F G H I A B C D E F G H I A B C D E F G H I A B C D E F G H
I A B C D IN ( SELECT A B C D E F G H I A B C D E F G H IA B C D E F G H I A B C D E F G H I );
5 SELECT A B C D E F G H I A B C D E F G H IA B C D E F G H I A B C D E F G H I A B C D E F G H I A B
I A B C D IN ( SELECT A B C D E F G H I A B C D E F G H IA B C D E F G H I A B C D E F G H I );

Here is the file which u needed....

helper

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LEARN ABOUT PHP

db2_num_rows

DB2_NUM_ROWS(3) 							 1							   DB2_NUM_ROWS(3)

db2_num_rows - Returns the number of rows affected by an SQL statement

SYNOPSIS

       int db2_num_rows (resource  $stmt)

DESCRIPTION

	Returns the number of rows deleted, inserted, or updated by an SQL statement.

	To  determine  the  number  of	rows  that  will be returned by a SELECT statement, issue SELECT COUNT(*) with the same predicates as your
       intended SELECT statement and retrieve the value.

	If your application logic checks the number of rows returned by a SELECT statement and branches if the number of rows is 0, consider modi-
       fying  your  application  to  attempt  to  return  the  first row with one of db2_fetch_assoc(3), db2_fetch_both(3), db2_fetch_array(3), or
       db2_fetch_row(3), and branch if the fetch function returns FALSE.

       Note

	       If you issue a SELECT statement using a scrollable cursor, db2_num_rows(3) returns the number of rows returned by the SELECT state-
	      ment.  However,  the  overhead  associated with scrollable cursors significantly degrades the performance of your application, so if
	      this is the only reason you are considering using scrollable cursors, you should use a forward-only cursor and  either  call  SELECT
	      COUNT(*) or rely on the boolean return value of the fetch functions to achieve the equivalent functionality with much better perfor-
	      mance.

PARAMETERS

	      o $stmt
		- A valid stmt resource containing a result set.

RETURN VALUES

	Returns the number of rows affected by the last SQL statement issued by the specified statement handle.

PHP Documentation Group 													   DB2_NUM_ROWS(3)

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