> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/appendixes/contrib/dblink.md).

# F.11. dblink — connect to other PostgreSQL databases \#

[dblink\_connect](/appendixes/contrib/dblink/contrib-dblink-connect.md) — opens a persistent connection to a remote database

[dblink\_connect\_u](/appendixes/contrib/dblink/contrib-dblink-connect-u.md) — opens a persistent connection to a remote database, insecurely

[dblink\_disconnect](/appendixes/contrib/dblink/contrib-dblink-disconnect.md) — closes a persistent connection to a remote database

[dblink](/appendixes/contrib/dblink/contrib-dblink-function.md) — executes a query in a remote database

[dblink\_exec](/appendixes/contrib/dblink/contrib-dblink-exec.md) — executes a command in a remote database

[dblink\_open](/appendixes/contrib/dblink/contrib-dblink-open.md) — opens a cursor in a remote database

[dblink\_fetch](/appendixes/contrib/dblink/contrib-dblink-fetch.md) — returns rows from an open cursor in a remote database

[dblink\_close](/appendixes/contrib/dblink/contrib-dblink-close.md) — closes a cursor in a remote database

[dblink\_get\_connections](/appendixes/contrib/dblink/contrib-dblink-get-connections.md) — returns the names of all open named dblink connections

[dblink\_error\_message](/appendixes/contrib/dblink/contrib-dblink-error-message.md) — gets last error message on the named connection

[dblink\_send\_query](/appendixes/contrib/dblink/contrib-dblink-send-query.md) — sends an async query to a remote database

[dblink\_is\_busy](/appendixes/contrib/dblink/contrib-dblink-is-busy.md) — checks if connection is busy with an async query

[dblink\_get\_notify](/appendixes/contrib/dblink/contrib-dblink-get-notify.md) — retrieve async notifications on a connection

[dblink\_get\_result](/appendixes/contrib/dblink/contrib-dblink-get-result.md) — gets an async query result

[dblink\_cancel\_query](/appendixes/contrib/dblink/contrib-dblink-cancel-query.md) — cancels any active query on the named connection

[dblink\_get\_pkey](/appendixes/contrib/dblink/contrib-dblink-get-pkey.md) — returns the positions and field names of a relation's primary key fields

[dblink\_build\_sql\_insert](/appendixes/contrib/dblink/contrib-dblink-build-sql-insert.md) — builds an INSERT statement using a local tuple, replacing the primary key field values with alternative supplied values

[dblink\_build\_sql\_delete](/appendixes/contrib/dblink/contrib-dblink-build-sql-delete.md) — builds a DELETE statement using supplied values for primary key field values

[dblink\_build\_sql\_update](/appendixes/contrib/dblink/contrib-dblink-build-sql-update.md) — builds an UPDATE statement using a local tuple, replacing the primary key field values with alternative supplied values

`dblink` is a module that supports connections to other PostgreSQL databases from within a database session.

`dblink` can report the following wait events under the wait event type `Extension`.

`DblinkConnect` : Waiting to establish a connection to a remote server.

`DblinkGetConnect` : Waiting to establish a connection to a remote server when it could not be found in the list of already-opened connections.

`DblinkGetResult` : Waiting to receive the results of a query from a remote server.

See also [postgres\_fdw](/appendixes/contrib/postgres-fdw.md), which provides roughly the same functionality using a more modern and standards-compliant infrastructure.

***

原文：[PostgreSQL 18.6 Documentation](https://www.postgresql.org/docs/18/dblink.html)（英文原文，待翻譯）


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