The pg_cursors view lists the cursors that are currently available. Cursors can be defined in several ways:
via the DECLARE statement in SQL
via the Bind message in the frontend/backend protocol, as described in Section 50.2.3
via the Server Programming Interface (SPI), as described in Section 44.1
The pg_cursors view displays cursors created by any of these means. Cursors only exist for the duration of the transaction that defines them, unless they have been declared WITH HOLD . Therefore non-holdable cursors are only present in the view until the end of their creating transaction.
Note: Cursors are used internally to implement some of the components of PostgreSQL , such as procedural languages. Therefore, the pg_cursors view might include cursors that have not been explicitly created by the user.
Table 49-60. pg_cursors Columns
|name||text||The name of the cursor|
|statement||text||The verbatim query string submitted to declare this cursor|
|is_holdable||boolean||true if the cursor is holdable (that is, it can be accessed after the transaction that declared the cursor has committed); false otherwise|
|is_binary||boolean||true if the cursor was declared BINARY ; false otherwise|
|is_scrollable||boolean||true if the cursor is scrollable (that is, it allows rows to be retrieved in a nonsequential manner); false otherwise|
|creation_time||timestamptz||The time at which the cursor was declared|
The pg_cursors view is read only.