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Full Discussion: Parse through ~21,000 Database DDL statements -- Fastest way to perform search, replace and insert
Top Forums Shell Programming and Scripting Parse through ~21,000 Database DDL statements -- Fastest way to perform search, replace and insert Post 302805653 by madhunk on Friday 10th of May 2013 02:42:17 PM
Old 05-10-2013
Parse through ~21,000 Database DDL statements -- Fastest way to perform search, replace and insert
Hello All:

We are looking to search through 2000 files with around 21,000 statements where we have to search, replace and insert a pattern based on the following:

1) Parse through the file and check for CREATE MULTISET TABLE or CREATE SET TABLE statements.....and they always end with ON COMMIT PRESERVE ROWS;

Code:
CREATE MULTISET VOLATILE TABLE vt_test
, NO FALLBACK, NO JOURNAL, NO LOG AS
(
                select col1,max(col2) as col2 
                from vt_test
                where col3 in (1,2,3)
)
WITH DATA 
PRIMARY INDEX (col1) 
ON COMMIT PRESERVE ROWS;

2) Replace WITH DATA to WITH NO DATA. If there is already NO DATA, skip changing it.

Code:
CREATE MULTISET VOLATILE TABLE vt_test
, NO FALLBACK, NO JOURNAL, NO LOG AS
(
                select col1,max(col2) as col2 
                from vt_test
                where col3 in (1,2,3)
)
WITH NO DATA 
PRIMARY INDEX (col1) 
ON COMMIT PRESERVE ROWS;

3) Add an INSERT statement right after this....with the same table name. Basically, take the SELECT part from above and end it with a semi-colon. The challenge is code is not formatted. It can be in one line...and can be a mix of CAPS and SMALL (case insensitive). Final code should look like this:

Code:
CREATE MULTISET VOLATILE TABLE vt_test
, NO FALLBACK, NO JOURNAL, NO LOG AS
(
                select col1,max(col2) as col2 
                from vt_test
                where col3 in (1,2,3)
)
WITH NO DATA 
PRIMARY INDEX (col1) 
ON COMMIT PRESERVE ROWS;

INSERT INTO vt_test
select col1,max(col2) as col2 
from vt_test
where col3 in (1,2,3);

4) Output a new file in another directory....

I am comfortable doing the pattern replace using awk, but not well versed with doing the additional step. Please see below and see if you can help.

Code:
#!/usr/bin/ksh
#|------------------------------------------------------------------|
#|  Split the CREATE TABLE AS into DDL and DML Step
#|------------------------------------------------------------------|

usage ()
{
     echo " Usage: $0 <SRC_DIR> <TGT_DIR>"
}

if [ $# -lt 2 ]; then
        usage
        exit;
fi

SRC_DIR=$1
TGT_DIR=$2


for i in *.prc
do
awk 'BEGIN{IGNORECASE=1} {gsub(/WITH DATA/,"WITH NO DATA");print}' $i > TGT_DIR
done

 

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LEARN ABOUT REDHAT

create_table_as

CREATE TABLE 
AS(7)						   SQL Commands 						CREATE TABLE AS(7)

NAME

       CREATE TABLE AS - create a new table from the results of a query

SYNOPSIS

       CREATE [ [ LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name [ (column_name [, ...] ) ]
	   AS query

DESCRIPTION

       CREATE  TABLE AS creates a table and fills it with data computed by a SELECT command. The table columns have the names and data types asso-
       ciated with the output columns of the SELECT (except that you can override the column names by  giving  an  explicit  list  of  new  column
       names).

       CREATE TABLE AS bears some resemblance to creating a view, but it is really quite different: it creates a new table and evaluates the query
       just once to fill the new table initially. The new table will not track subsequent changes to the source tables of the query. In  contrast,
       a view re-evaluates its defining SELECT statement whenever it is queried.

PARAMETERS

       [LOCAL] TEMPORARY or [LOCAL] TEMP
	      If specified, the table is created as a temporary table.	Refer to CREATE TABLE [create_table(7)] for details.

       table_name
	      The name (optionally schema-qualified) of the table to be created.

       column_name
	      The  name of a column in the new table. Multiple column names can be specified using a comma-delimited list of column names. If col-
	      umn names are not provided, they are taken from the output column names of the query.

       query  A query statement (that is, a SELECT command). Refer to SELECT [select(7)] for a description of the allowed syntax.

DIAGNOSTICS

       Refer to CREATE TABLE [create_table(7)] and SELECT [select(7)] for a summary of possible output messages.

NOTES

       This command is functionally equivalent to SELECT INTO [select_into(7)], but it is preferred since it is less likely to	be  confused  with
       other uses of the SELECT ... INTO syntax.

COMPATIBILITY

       This  command  is modeled after an Oracle feature. There is no command with equivalent functionality in SQL92 or SQL99. However, a combina-
       tion of CREATE TABLE and INSERT ... SELECT can accomplish the same thing with little more effort.

HISTORY

       The CREATE TABLE AS command has been available since PostgreSQL 6.3.

SEE ALSO

       CREATE TABLE [create_table(7)], CREATE VIEW [create_view(l)], SELECT [select(l)], SELECT INTO [select_into(l)]

SQL - Language Statements					    2002-11-22							CREATE TABLE AS(7)
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