Retry a sql query in case of failure in batch - sql

Question

This script processes all the sql files in a given folder and outputs the result to a csv. Do you have any ideas how could I adapt it to retry the sql file in case of error or failure?
#ECHO OFF
SET SQLCMD="C:\Program Files\Microsoft SQL Server\100\Tools\Binn\SQLCMD.EXE"
SET PATH="C:\Users\username\Desktop\Scripts\Reports\sql"
SET SERVER="localhost"
SET DB="database"
SET LOGIN="username"
SET PASSWORD="password"
SET OUTPUT="C:\Users\username\Desktop\Scripts\Reports\output_%date%-%time:~0,2%-%time:~3,2%-%time:~6,2%.csv"
CD %PATH%
ECHO %date% %time% > %OUTPUT%
for %%f in (*.sql) do (
%SQLCMD% -S %SERVER% -d %DB% -E -i %%~f >> %OUTPUT% -W -w 1024 -s";")
Thank you!

Answer 1

You cant test the ERRORLEVEL environment variable. typically a zero ERRORLEVEL value means success. also you need to enable delayed expansion to check it inside a block.
something like this may help,
SetLocal EnableDelayedExpansion
for %%f in (*.sql) do (
Set /a success=1
for /L %%w in (1,1,5) do ( rem retry five times
if !success! NEQ 0 (
%SQLCMD% -S %SERVER% -d %DB% -E -i %%~f >> %OUTPUT% -W -w 1024 -s";"
if !ERRORLEVEL! EQU 0 set /a success=0
)
)
if !success! NEQ 0 (
rem sql failed, log or advise
)
)
EndLocal
another important point, be careful with the PATH environment variable. you should better use another name as SQL_PATH or MY_PATH.
or you can use PUSHD & POPD to change your working dir
#echo off
SET ...
rem save current dir and jump to...
pushd "C:\Users\username\Desktop\Scripts\Reports\sql"
for %%f in (*.sql) do (
...
...
)
rem restore dir saved by pushd
popd