The OpenNET Project / Index page

[ новости /+++ | форум | wiki | теги | ]

Интерактивная система просмотра системных руководств (man-ов)

 ТемаНаборКатегория 
 
 [Cписок руководств | Печать]

spi_cursor_open (7)
  • >> spi_cursor_open (7) ( Разные man: Макропакеты и соглашения )
  •  

    NAME

    SPI_cursor_open - set up a cursor using a plan created with SPI_prepare
    

     

    SYNOPSIS

    Portal SPI_cursor_open(const char * name, void * plan,
                           Datum * values, const char * nulls,
                           bool read_only)
    
    
     

    DESCRIPTION

    SPI_cursor_open sets up a cursor (internally, a portal) that will execute a plan prepared by SPI_prepare. The parameters have the same meanings as the corresponding parameters to SPI_execute_plan.

    Using a cursor instead of executing the plan directly has two benefits. First, the result rows can be retrieved a few at a time, avoiding memory overrun for queries that return many rows. Second, a portal can outlive the current procedure (it can, in fact, live to the end of the current transaction). Returning the portal name to the procedure's caller provides a way of returning a row set as result.  

    ARGUMENTS

    const char * name
    name for portal, or NULL to let the system select a name
    void * plan
    execution plan (returned by SPI_prepare)
    Datum * values
    An array of actual parameter values. Must have same length as the plan's number of arguments.
    const char * nulls
    An array describing which parameters are null. Must have same length as the plan's number of arguments. n indicates a null value (entry in values will be ignored); a space indicates a nonnull value (entry in values is valid).

    If nulls is NULL then SPI_cursor_open assumes that no parameters are null.

    bool read_only
    true for read-only execution
     

    RETURN VALUE

    pointer to portal containing the cursor, or NULL on error


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    ARGUMENTS
    RETURN VALUE


    Поиск по тексту MAN-ов: 




    Спонсоры:
    Inferno Solutions
    Hosting by Hoster.ru
    Хостинг:

    Закладки на сайте
    Проследить за страницей
    Created 1996-2021 by Maxim Chirkov
    Добавить, Поддержать, Вебмастеру