DBI::Gofer::Execute man page on HP-UX

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DBI::Gofer::Execute(3)User Contributed Perl DocumentatioDBI::Gofer::Execute(3)

       DBI::Gofer::Execute - Executes Gofer requests and returns Gofer

	 $executor = DBI::Gofer::Execute->new( { ...config... });

	 $response = $executor->execute_request( $request );

       Accepts a DBI::Gofer::Request object, executes the requested DBI method
       calls, and returns a DBI::Gofer::Response object.

       Any error, including any internal 'fatal' errors are caught and con‐
       verted into a DBI::Gofer::Response object.

       This module is usually invoked by a 'server-side' Gofer transport mod‐
       ule.  They usually have names in the ""DBI::Gofer::Transport::*""
       namespace.  Examples include: DBI::Gofer::Transport::stream and


       If defined, it must be a reference to a subroutine that will 'check'
       the request.  It is pass the request object and the executor as its
       only arguments.

       The subroutine can either return the original request object or die
       with a suitable error message (which will be turned into a Gofer

       It can also construct and return a new request that should be executed
       instead of the original request.


       If set, this DSN is always used instead of the one in the request.


       If set, this DSN is used if "forced_connect_dsn" is not set and the
       request does not contain a DSN itself.


       A reference to a hash of connect() attributes. Individual attributes in
       "forced_connect_attributes" will take precedence over corresponding
       attributes in the request.


       A reference to a hash of connect() attributes. Individual attributes in
       the request take precedence over corresponding attributes in


       If set, the loaded drivers will be checked to ensure they don't have
       more than this number of cached connections. There is no default value.
       This limit is not enforced for every request.


       If set, all the cached statement handles will be cleared once the num‐
       ber of cached statement handles rises above this limit. The default is


       If true, then only the first result set will be fetched and returned in
       the response.


       A reference to a data structure that can specify extra attributes to be
       returned in responses.

	 forced_response_attributes => {
	     DriverName => {
		 dbh => [ qw(dbh_attrib_name) ],
		 sth => [ qw(sth_attrib_name) ],

       This can be useful in cases where the driver has not implemented the
       private_attribute_info() method and DBI::Gofer::Execute's own fallback
       list of private attributes doesn't include the driver or attributes you


       If set, specifies the number of recent requests and responses that
       should be kept by the update_stats() method for diagnostics. See

       Note that this setting can significantly increase memory use. Use with


       Enable forced random failures and/or delays for testing. See
       "DBI_GOFER_RANDOM" below.

       Gofer needs to know about any driver-private attributes that should
       have their values sent back to the client.

       If the driver doesn't support private_attribute_info() method, and very
       few do, then the module fallsback to using some hard-coded details, if
       available, for the driver being used. Currently hard-coded details are
       available for the mysql, Pg, Sybase, and SQLite drivers.

       DBD::Gofer, DBD::Execute and related packages are well tested by exe‐
       cuting the DBI test suite with DBI_AUTOPROXY configured to route all
       DBI calls via DBD::Gofer.

       Because Gofer includes timeout and 'retry on error' mechanisms there is
       a need for some way to trigger delays and/or errors. This can be done
       via the "forced_gofer_random" configuration item, or else the
       DBI_GOFER_RANDOM environment variable.


       The value of the "forced_gofer_random" configuration item (or else the
       DBI_GOFER_RANDOM environment variable) is treated as a series of tokens
       separated by commas.

       The tokens can be one of three types:

	   Set the current failure rate to R where R is a percentage.  The
	   value R can be floating point, e.g., "fail=0.05%".  Negative values
	   for R have special meaning, see below.

	   Set the current random delay rate to R where R is a percentage, and
	   set the current delay duration to N seconds. The values of R and N
	   can be floating point, e.g., "delay120=0.1%".  Negative values for
	   R have special meaning, see below.

	   Applies the current current random failure rate and random delay
	   rate and duration to the named method.  If neither a fail nor delay
	   have been set yet then a warning is generated.

       For example:

	 $executor = DBI::Gofer::Execute->new( {
	   forced_gofer_random => "fail=0.01%,do,delay60=1%,execute",

       will cause the do() method to fail for 0.01% of calls, and the exe‐
       cute() method to fail 0.01% of calls and be delayed by 60 seconds on 1%
       of calls.

       If the percentage value ("R") is negative then instead of the failures
       being triggered randomly (via the rand() function) they are triggered
       via a sequence number. In other words ""fail=-20%"" will mean every
       fifth call will fail.  Each method has a distinct sequence number.

       Tim Bunce, <http://www.linkedin.com/in/timbunce>

       Copyright (c) 2007, Tim Bunce, Ireland. All rights reserved.

       This module is free software; you can redistribute it and/or modify it
       under the same terms as Perl itself. See perlartistic.

perl v5.8.8			  2007-05-13		DBI::Gofer::Execute(3)

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