How to Pass a sqlplus parameter from shell script to sql file - sql

Question

I am having a Shell script that has a variable storing the date value using sqlplus connection as below. I want to pass the shell variable 'var_Date' value to the sql file.
cat extract.sh
#!/bin/ksh
var_Date=`sqlplus -s $DB_USER/$DB_PASS#$DB_HOST:$DB_PORT/$DB_SID << EOF
SELECT MAX(SAMPLE_DATE)-1 FROM SAMPLE_CASES WHERE KEY IN ('ab','bc');
EXIT;
EOF`
export var_Date
echo $var_Date
sqlplus -s $DB_USER/$DB_PASS#$DB_HOST:$DB_PORT/$DB_SID #data_extract.sql $var_Date
cat extract.sql
set echo off
set trimspool on
set pagesize 0
set colsep ~
spool extract.csv
SELECT CASE_ID FROM SAMPLE_CASE1 WHERE TIME_START>='&1'
spool off
I have tried to execute this script but it is failing with invalid identifier. Please help to understand what is the mistake I am doing here.

Answer 1

After searching in the internet for almost a week, could arrive at a working code. Below is the working code.
cat extract.sh
#!/bin/ksh
var_Date=`sqlplus -s $DB_USER/$DB_PASS#$DB_HOST:$DB_PORT/$DB_SID << EOF
SET HEADING OFF
SELECT ''''||TRIM(MAX(SAMPLE_DATE)-1)||'''' FROM SAMPLE_CASES WHERE KEY IN ('ab','bc');
EXIT;
EOF`
export var_Date
echo $var_Date
sqlplus -s $DB_USER/$DB_PASS#$DB_HOST:$DB_PORT/$DB_SID #data_extract.sql $var_Date
cat extract.sql
set echo off
set trimspool on
set pagesize 0
set colsep ~
spool extract.csv
SELECT CASE_ID FROM SAMPLE_CASE1 WHERE to_char(TIME_START,'DD-MON-YYYY') >='&1'
spool off
Firstly, we to need to pass the argument $var_Date to sqlplus within single quotes which is done within the variable declaration itself by concatenating ''''. We also need to use SET HEADING OFF to make the variable var_Date hold only the date value and not the header value.
Secondly, there was a ora error: "ORA-01858: a non-numeric character was found where a numeric was expected". To mitigate this, I had type-casted the field time_start to to_char post which the filter is applied and stored in the csv file.
Hope this helps others who had trouble like me.