Batch script extract contents between two strings - windows

Question

I am trying to write this Batch script to extract the two parameters from an XML file that looks like this:
<?xml version="1.0" encoding="utf-8" ?>
<!--<var name="SqlConnection" value="data source=SERVERNAME;initialcatalog=DB_NAME;user id=JackDaniels;password=G235X" />-->
<var name="SqlConnection" value="data source=SERVERNAME;initial catalog=DB_Name;Integrated Security=SSPI" />
My objective is to extract SERVERNAME and DB_NAME from the line that is not commented out.
So far my code looks like this:
#echo off
setlocal enableextensions disabledelayedexpansion
set "connectionString="
set result=""
set "INPUT_FILE=DBConnection.config"
FOR /F "tokens=* delims=<var eol=!" %%x in (%INPUT_FILE%) DO (
ECHO %%x
)
PAUSE
I'm just not sure how to get everything right after "data source=" and "initial catalog=". Is there an easy way to do this?

Answer 1

The adequate way to extract this data is not via a Batch file, but with the methods suggested in a comment. However, the Batch file below perform this extraction in a relatively simple way:
#echo off
setlocal EnableDelayedExpansion
rem From the line that have "<var" followed by "value"...
for /F "delims=" %%a in ('findstr "\<var.*value" input.txt') do (
rem ... process the parts separated by space or equal sign, excepting if enclosed in quotes...
for %%b in (%%a) do (
rem ... and store the part after "value" variable
if "!var!" equ "value" set "value=%%~b"
set "var=%%~b"
)
)
rem Separate "value" string at semicolons and assign each part via SET command
for %%a in ("%value:;=" "%") do set %%a
rem Show results:
echo data source=%data source%
echo initial catalog=%initial catalog%
echo Integrated Security=%Integrated Security%
Output example:
data source=SERVERNAME
initial catalog=DB_Name
Integrated Security=SSPI
Of course, if the data format described in the code changes, the program will fail...

Answer 2

#ECHO Off
SETLOCAL
SET "sourcedir=U:\sourcedir"
SET "filename1=%sourcedir%\q42420941.txt"
FOR %%v IN (initial catalog data source initial_catalog data_source) DO SET "%%v="
FOR /f "delims=<>" %%z IN ('findstr /B /L /C:"\<var name" "%filename1%"') DO (
FOR %%y IN (%%z) DO (
FOR %%a IN (%%~y) DO (
SET "alive=Y"
FOR %%m IN (initial catalog data source) DO IF /i "%%a"=="%%m" SET "alive="&set %%a=Y
IF DEFINED alive (
IF DEFINED initial IF DEFINED catalog SET "initial_catalog=%%a"
IF DEFINED data IF DEFINED source SET "data_source=%%a"
)
IF DEFINED catalog IF NOT DEFINED initial SET alive=y
IF DEFINED source IF NOT DEFINED data SET alive=y
IF DEFINED alive FOR %%v IN (initial catalog data source) DO set "%%v="
)
)
)
ECHO %initial_catalog% and %data_source%
GOTO :EOF
You would need to change the setting of sourcedir to suit your circumstances.
I used a file named q42420941.txt containing your data for my testing.
first, clear out the variable-names.
next, parse each line that passes the findstr which is looking for lines that /L literally /B begin with the /c: character-sequence "< escaped by \) and take the first token delimited by > or <.
This neatly strips the awkward <> from the string and assigns the contents of the selected line to %%z
Next, use a simple for to present each token in the line to %%y.
Then with the quotes stripped off of %%y assign each token to %%a.
Search for a match against the keywords, and set the variable of the same name if found. Clear alive if a keyword is found.
If the string in %%a is not one of the keywords, then check to see whether initial and catalog are both set. If so, this is the required string, so assign it.
if catalog is found but not initial then mark as alive
If alive is still set, then we can clear the flags and wait for the start of another sequence.
OK - it has its faults. It won't detect initial_catalog/data_source if either is one of the four keywords (unlikely) and it assumes that the wanted data is the token following the two keywords - the = becomes a separator in the for list.

Answer 3

Since many of you suggested that Batch is not an adequate way of doing this, I decided to play around with PowerShell, and was able to accomplish what I wanted with just a few lines, and some Regex!
$configPath = $PSScriptRoot + "DBConnection.config"
[xml]$XmlDocument = Get-Content -Path $configPath
$dataSource = $XmlDocument.var.Attributes[1].Value.ToString() # Extract the uncommented line, and the second attribute "value"
$serverName = ($dataSource -split 'data source=([^;]*);')[1]
$db_name = ($dataSource -split 'initial catalog=([^;]*);')[1]
$user_id = ($dataSource -split 'id=([^;]*);')[1]
$user_pass = ($dataSource -split 'password=([^;]*)')[1]