PostgreSQL

SPI_cursor_parse_open
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SPI_cursor_parse_open

SPI_cursor_parse_open — set up a cursor using a query string and parameters

Synopsis

Portal SPI_cursor_parse_open(const char *name,
                             const char *command,
                             const SPIParseOpenOptions * options)

Description

SPI_cursor_parse_open sets up a cursor (internally, a portal) that will execute the specified query string. This is comparable to SPI_prepare_cursor followed by SPI_cursor_open_with_paramlist, except that parameter references within the query string are handled entirely by supplying a ParamListInfo object.

For one-time query execution, this function should be preferred over SPI_prepare_cursor followed by SPI_cursor_open_with_paramlist. If the same command is to be executed with many different parameters, either method might be faster, depending on the cost of re-planning versus the benefit of custom plans.

The `options->params object should normally mark each parameter with the `PARAM_FLAG_CONST flag, since a one-shot plan is always used for the query.

The passed-in parameter data will be copied into the cursor’s portal, so it can be freed while the cursor still exists.

Arguments

+const char * +`+name+`: name for portal, or NULL to let the system select a name
+const char * +`+command+`: command string
+const SPIParseOpenOptions * +`+options+`: struct containing optional arguments

Callers should always zero out the entire `options struct, then fill whichever fields they want to set. This ensures forward compatibility of code, since any fields that are added to the struct in future will be defined to behave backwards-compatibly if they are zero. The currently available options` fields are:

+ParamListInfo +`+params+`: data structure containing query parameter types and values; NULL if none
+int +`+cursorOptions+`: integer bit mask of cursor options; zero produces default behavior
+bool +`+read_only+`: true for read-only execution

Return Value

Pointer to portal containing the cursor. Note there is no error return convention; any error will be reported via elog.

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