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Top Forums Shell Programming and Scripting How to handle NULL value output from ISQL command? Post 302908594 by Sharma331 on Wednesday 9th of July 2014 03:41:32 AM
Old 07-09-2014
How to handle NULL value output from ISQL command?

I am using ISQL command in ksh script.
Suppose if i get NULL value from the query which i run,how can i handle it?

I am getting a NULL result set and the following error is coming.

Code:
############### output of isql command for getting the sum of JEs ################

-----------
        NULL

(1 row affected)
############ Checking if count is blank ###########
NULL
retrieveCheck.ksh[159]:  ^J NULL : 0403-009 The specified number is not valid for this command.

The code is:

Code:
blank=""
isql  -UUSER -PPW -SSERVER -i$tempSQL2 -w1000 -o$sumOfJEOutputFile
retval=$?
echo $retval
if [[ $retval != 0 ]]; then
            echo "Failed to connect to the Archive Database" | mail -s "ERROR OCCURED:Database connection Failed" "akanksha.kumari@libertymutual.com" 
            exit 0
else
            echo "Database connection successful."
fi
echo "coming out of isql command"
echo "############ output of isql command for getting the sum of JEs ################"
cat $sumOfJEOutputFile

egrep -v "row affected|rows affected|------|^                 |return status" $sumOfJEOutputFile > $actualCount
#######################################################################
##     Assigning the total number of JE count to a variable count 
#######################################################################
count=$(cat $actualCount | tr -s "\t" " ")
echo "############## Checking if count is blank #################"
echo $count
if [[ $count -eq $blank ]]; then ## In this line error is coming line number 159
echo "Count is Blank."
exit 0
else
echo "count is not blank"
fi

So i want to know how can i handle this null result set and send a mail to notify that null value is coming.

Thanks
Akanksha
 

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PG_FETCH_ARRAY(3)														 PG_FETCH_ARRAY(3)

pg_fetch_array - Fetch a row as an array

SYNOPSIS
array pg_fetch_array (resource $result, [int $row], [int $result_type = PGSQL_BOTH]) DESCRIPTION
pg_fetch_array(3) returns an array that corresponds to the fetched row (record). pg_fetch_array(3) is an extended version of pg_fetch_row(3). In addition to storing the data in the numeric indices (field number) to the result array, it can also store the data using associative indices (field name). It stores both indicies by default. Note This function sets NULL fields to the PHP NULL value. pg_fetch_array(3) is NOT significantly slower than using pg_fetch_row(3), and is significantly easier to use. PARAMETERS
o $result - PostgreSQL query result resource, returned by pg_query(3), pg_query_params(3) or pg_execute(3) (among others). o $row - Row number in result to fetch. Rows are numbered from 0 upwards. If omitted or NULL, the next row is fetched. o $result_type - An optional parameter that controls how the returned array is indexed. $result_type is a constant and can take the following values: PGSQL_ASSOC, PGSQL_NUM and PGSQL_BOTH. Using PGSQL_NUM, pg_fetch_array(3) will return an array with numerical indices, using PGSQL_ASSOC it will return only associative indices while PGSQL_BOTH, the default, will return both numerical and associa- tive indices. RETURN VALUES
An array indexed numerically (beginning with 0) or associatively (indexed by field name), or both. Each value in the array is represented as a string. Database NULL values are returned as NULL. FALSE is returned if $row exceeds the number of rows in the set, there are no more rows, or on any other error. EXAMPLES
Example #1 pg_fetch_array(3) example <?php $conn = pg_pconnect("dbname=publisher"); if (!$conn) { echo "An error occurred. "; exit; } $result = pg_query($conn, "SELECT author, email FROM authors"); if (!$result) { echo "An error occurred. "; exit; } $arr = pg_fetch_array($result, 0, PGSQL_NUM); echo $arr[0] . " <- Row 1 Author "; echo $arr[1] . " <- Row 1 E-mail "; // As of PHP 4.1.0, the row parameter is optional; NULL can be passed instead, // to pass a result_type. Successive calls to pg_fetch_array will return the // next row. $arr = pg_fetch_array($result, NULL, PGSQL_ASSOC); echo $arr["author"] . " <- Row 2 Author "; echo $arr["email"] . " <- Row 2 E-mail "; $arr = pg_fetch_array($result); echo $arr["author"] . " <- Row 3 Author "; echo $arr[1] . " <- Row 3 E-mail "; ?> SEE ALSO
pg_fetch_row(3), pg_fetch_object(3), pg_fetch_result(3). PHP Documentation Group PG_FETCH_ARRAY(3)
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