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12.4. DBI Environment Variables

The following environment variables are defined for use with DBI:

DBI_DSN
The data source value to use if none is specified with the connect method.

DBI_DRIVER
The driver to use if none is specified with the connect method.

DBI_USER
The username to use if none is specified with the connect method.

DBI_PASS
The password to use if none is specified with the connect method. (For security purposes, this environment variable should not be set except for testing.)

DBI_TRACE
Enables tracing behavior as with the trace method. DBI_TRACE can be set to any of the following values:

0
Disables the trace

1
Traces the execution of the DBI

2
Outputs detailed call trace information including parameters and return values

filename
Appends trace information to the specified file; the trace level is set to 2.



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