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   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.
  
The handle of the connection on which to execute the command.
The SQL command to execute.
For PostgreSQL versions greater than 7.4, args consists of zero or more optional values that can be inserted, unquoted, into the SQL statement using $-style substitution.