A

DBI Environment Variables

DBI consults several environment variables, listed in Table H.4. All of them except DBI_TRACE are used by the connect() method. DBI_DRIVER is used by the data_sources() method, and DBI_TRACE is used by trace().

Table H.4. DBI Environment Variables

Name	Meaning
DBI_DRIVER	DBD-level driver name ("mysql" for MySQL)
DBI_DSN	Data source name
DBI_PASS	Password
DBI_TRACE	Trace level and/or trace output file
DBI_USER	Username