SPI_CURSOR_MOVE(3) PostgreSQL 9.2.7 Documentation SPI_CURSOR_MOVE(3)NAME
SPI_cursor_move - move a cursor
void SPI_cursor_move(Portal portal, bool forward, long count)
SPI_cursor_move skips over some number of rows in a cursor. This is equivalent to a subset of the SQL command MOVE (see
SPI_scroll_cursor_move for more functionality).
portal containing the cursor
true for move forward, false for move backward
maximum number of rows to move
Moving backward may fail if the cursor's plan was not created with the CURSOR_OPT_SCROLL option.
PostgreSQL 9.2.7 2014-02-17 SPI_CURSOR_MOVE(3)
Check Out this Related Man Page
SPI_CURSOR_OPEN(3) PostgreSQL 9.2.7 Documentation SPI_CURSOR_OPEN(3)NAME
SPI_cursor_open - set up a cursor using a statement created with SPI_prepare
Portal SPI_cursor_open(const char * name, SPIPlanPtr plan,
Datum * values, const char * nulls,
SPI_cursor_open sets up a cursor (internally, a portal) that will execute a statement 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 statement 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.
The passed-in parameter data will be copied into the cursor's portal, so it can be freed while the cursor still exists.
const char * name
name for portal, or NULL to let the system select a name
prepared statement (returned by SPI_prepare)
Datum * values
An array of actual parameter values. Must have same length as the statement's number of arguments.
const char * nulls
An array describing which parameters are null. Must have same length as the statement'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.
true for read-only execution
Pointer to portal containing the cursor. Note there is no error return convention; any error will be reported via elog.
PostgreSQL 9.2.7 2014-02-17 SPI_CURSOR_OPEN(3)
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