Background Script if database get disconnect Re open an application

Question

Dear Sir,
we prepare a shell script to Re open an application if database get disconnect,
and the details as showing below:
*#  -1-to check if we are not connecting to Database Re-open*
tnsping80 tnsname > c:\test.txt
FOR /F "skip=6" %%A IN (C:\test.txt) DO IF %%A NEQ OK GOTO reset
del c:\test.txt
*#  -2- to check if there is any job waiting on database Re-open*
sqlplus -s username/password@tnsname @jobWaiting.sql
FOR /F "skip=3" %%A IN (C:\test.txt) DO IF %%A EQU 1 GOTO reset
del C:\test.txt
My problem is when the database get disconnecting after calling statement-1-, statement -2- failed and the background process stop working,
so how i can catch the error when I'm calling sqlplus -s username/password@tnsname.
Regards,

Answer 1

First try to sqlplus -l option to ask sqlplus to exit after first connection failure otherwise sqlplus retries to connect and prompts for new connect string:
>
-L[OGON]
Specifies not to reprompt for username or password if the initial connection does not succeed. This can be useful in operating system scripts that must either succeed or fail and you don't want to be reprompted for connection details if the database server is not running.
>
Then on Windows use %errorlevel% to check sqlplus return code. If sqlplus connection fails, errorlevel should be set to a non zero value.