pg_exec submits a command to the PostgreSQL server and returns a result. Command result handles start with the connection handle and add a period and a result number.
Note that lack of a Tcl error is not proof that the command succeeded! An error message returned by the server will be processed as a command result with failure status, not by generating a Tcl error in pg_exec.
A result handle. A Tcl error will be returned if pgtcl was unable to obtain a server response. Otherwise, a command result object is created and a handle for it is returned. This handle can be passed to pg_result to obtain the results of the command.