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create a spool file based on values passed from korn shell to sql script


 
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# 1  
create a spool file based on values passed from korn shell to sql script

this is my issue.
4 parameters are passed from korn shell to sql script.
Code:
 
parameter_1=  varchar2 datatype or no value entered my user.
parameter_2=  number datatype or no value entered my user.
parameter_3= number datatype or no value entered my user.
parameter_4= number datatype or no value entered my user.

But I have to use these 4 parameters in the select statement. And this is my problem. How to initialize these parameters to get all rows when the user does not enter any value?
# 2  
And what values do you want to pass to your database in case the user doesn't pass a value?
# 3  
may be anything . Can I pass an empty string " " or any special character ?
# 4  
You can pass whatever you want. The result of your SQL statement depends on those values, so they are rather important.
# 5  
Okay. If i pass an empty string as in " " , can you please tell how can I write the select statement that will work no matter what value(s), the user enters.
The user can pass 4 parameters or choose not to pass any value for the 4 paramaters or just pass 1 st and 2nd parameters etc .
# 6  
You could use something like this:

Code:
_where=
for p; do
  [ -n "$_where" ] &&
    _where="$_where and $p" ||
      _where="where $p"    
done
      
select 
  col1, col2 ..
from
  table_name
"$_where";

And invoke the script like this:

Code:
./script_name 'col1 = val1' 'col2 = val2' ...

Consider the following example and output:

Code:
% cat s
_where=
for p; do
  [ -n "$_where" ] &&
    _where="$_where and $p" ||
      _where="where $p"    
done
      
cat << !
select 
  col1, col2 ..
from
  table_name
$_where;
!


Code:
% ksh s "col1 = 'val1'" 'col2 = val2'
select 
  col1, col2 ..
from
  table_name
where col1 = 'val1' and col2 = val2;

You could invoke it without arguments too and it will generate valid SQL:

Code:
% ksh s                              
select 
  col1, col2 ..
from
  table_name
;


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