| PostgreSQL 8.2.11 Documentation | ||||
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SPI_prepare can be used with
  SPI_cursor_open   SPI_is_cursor_plan returns true
   if a plan prepared by SPI_prepare can be passed
   as an argument to SPI_cursor_open, or
   false if that is not the case. The criteria are that the
   plan represents one single command and that this
   command returns tuples to the caller; for example, SELECT
   is allowed unless it contains an INTO clause, and
   UPDATE is allowed only if it contains a RETURNING
   clause.