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. The username to use if none is specified with the connect method. 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.) 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. Appends trace information to the specified file; the trace level is set to 2.

filename

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