pg_cursors
| PostgreSQL 9.4.14 Documentation | |||
|---|---|---|---|
| Prev | Up | Chapter 48. System Catalogs | Next |
The pg_cursors view lists the cursors that are currently available. Cursors can be defined in several ways:
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via the DECLARE statement in SQL
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via the Bind message in the frontend/backend protocol, as described in Section 49.2.3
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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 48-58. pg_cursors Columns
| Name | Type | Description |
|---|---|---|
| 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.