This is a good point and the thing I am trying to find out.

The syntax of DBI shows that my syntax is correct.

If I try the one you points out, the connection always fails with (tried it with and without empty space after comma):

DBI connect('Driver={SQL Server};Server=RC4FA9\SQLEXPRESS,1433;Databas
+e=test;UID=;PWD=','HASH(0xc2d3c50)',...) failed: [Microsoft][ODBC SQL
+ Server Driver][DBMSLPCN]SQL Server does not exist or access denied. 
+(SQL-08001) [state was 08001 now 01000]
[Microsoft][ODBC SQL Server Driver][DBMSLPCN]ConnectionOpen (Connect()
+). (SQL-01000) at ....

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In reply to Re^2: dbi:ODBC change Port by Anonymous Monk
in thread dbi:ODBC change Port by Anonymous Monk

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