PostgreSQL 9.6.5 Documentation
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# SPI_cursor_open_with_args

## Name

SPI_cursor_open_with_args -- set up a cursor using a query and parameters

## Synopsis

    Portal SPI_cursor_open_with_args(const char *name,
                                     const char *command,
                                     int nargs, Oid *argtypes,
                                     Datum *values, const char *nulls,
                                     bool read_only, int cursorOptions)

## Description

`SPI_cursor_open_with_args` sets up a cursor (internally, a portal) that will execute the specified query. Most of the parameters have the same meanings as the corresponding parameters to `SPI_prepare_cursor` and `SPI_cursor_open`.

For one-time query execution, this function should be preferred over `SPI_prepare_cursor` followed by `SPI_cursor_open`. 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 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

`int `nargs``

  number of input parameters (`$1`, `$2`, etc.)

`Oid * `argtypes``

  an array of length `nargs`, containing the OIDs of the data types of the parameters

`Datum * `values``

  an array of length `nargs`, containing the actual parameter values

`const char * `nulls``

  an array of length `nargs`, describing which parameters are null

  If `nulls` is `NULL` then `SPI_cursor_open_with_args` assumes that no parameters are null. Otherwise, each entry of the `nulls` array should be `' '` if the corresponding parameter value is non-null, or `'n'` if the corresponding parameter value is null. (In the latter case, the actual value in the corresponding `values` entry doesn't matter.) Note that `nulls` is not a text string, just an array: it does not need a `'\0'` terminator.

`bool `read_only``

  `true` for read-only execution

`int `cursorOptions``

  integer bit mask of cursor options; zero produces default behavior

## 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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