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📄 SPI_connect.3(2.18 KB)
📄 SPI_copytuple.3(1.76 KB)
📄 SPI_cursor_close.3(1.71 KB)
📄 SPI_cursor_fetch.3(2.05 KB)
📄 SPI_cursor_find.3(1.71 KB)
📄 SPI_cursor_move.3(1.92 KB)
📄 SPI_cursor_open.3(3.49 KB)
📄 SPI_cursor_open_with_args.3(3.77 KB)
📄 SPI_cursor_open_with_paramlist.3(2.78 KB)
📄 SPI_exec.3(1.72 KB)
📄 SPI_execp.3(2.65 KB)
📄 SPI_execute.3(7.86 KB)
📄 SPI_execute_plan.3(3.14 KB)
📄 SPI_execute_plan_with_paramlist.3(2.63 KB)
📄 SPI_execute_with_args.3(3.87 KB)
📄 SPI_finish.3(2.05 KB)
📄 SPI_fname.3(1.86 KB)
📄 SPI_fnumber.3(2.1 KB)
📄 SPI_freeplan.3(1.7 KB)
📄 SPI_freetuple.3(1.68 KB)
📄 SPI_freetuptable.3(2.37 KB)
📄 SPI_getargcount.3(1.83 KB)
📄 SPI_getargtypeid.3(2.09 KB)
📄 SPI_getbinval.3(2.24 KB)
📄 SPI_getnspname.3(1.78 KB)
📄 SPI_getrelname.3(1.68 KB)
📄 SPI_gettype.3(1.87 KB)
📄 SPI_gettypeid.3(1.79 KB)
📄 SPI_getvalue.3(2.11 KB)
📄 SPI_is_cursor_plan.3(2.33 KB)
📄 SPI_keepplan.3(2.02 KB)
📄 SPI_modifytuple.3(3.35 KB)
📄 SPI_palloc.3(1.6 KB)
📄 SPI_pfree.3(1.68 KB)
📄 SPI_pop.3(1.45 KB)
📄 SPI_prepare.3(5.21 KB)
📄 SPI_prepare_cursor.3(2.53 KB)
📄 SPI_prepare_params.3(2.34 KB)
📄 SPI_push.3(2.2 KB)
📄 SPI_repalloc.3(1.91 KB)
📄 SPI_returntuple.3(2.12 KB)
📄 SPI_saveplan.3(2.41 KB)
📄 SPI_scroll_cursor_fetch.3(2.36 KB)
📄 SPI_scroll_cursor_move.3(2.41 KB)
📄 dblink.3(6.49 KB)
📄 dblink_build_sql_delete.3(3.26 KB)
📄 dblink_build_sql_insert.3(3.85 KB)
📄 dblink_build_sql_update.3(4.1 KB)
📄 dblink_cancel_query.3(2.1 KB)
📄 dblink_close.3(2.7 KB)
📄 dblink_connect.3(5.66 KB)
📄 dblink_connect_u.3(2.73 KB)
📄 dblink_disconnect.3(2.09 KB)
📄 dblink_error_message.3(1.82 KB)
📄 dblink_exec.3(3.73 KB)
📄 dblink_fetch.3(4.15 KB)
📄 dblink_get_connections.3(1.7 KB)
📄 dblink_get_notify.3(2.48 KB)
📄 dblink_get_pkey.3(2.63 KB)
📄 dblink_get_result.3(4.86 KB)
📄 dblink_is_busy.3(1.82 KB)
📄 dblink_open.3(3.21 KB)
📄 dblink_send_query.3(2.32 KB)
📄 editline.3(20.41 KB)
📄 el_deletestr.3(20.41 KB)
📄 el_end.3(20.41 KB)
📄 el_get.3(20.41 KB)
📄 el_getc.3(20.41 KB)
📄 el_gets.3(20.41 KB)
📄 el_history.3(20.41 KB)
📄 el_history_end.3(20.41 KB)
📄 el_history_init.3(20.41 KB)
📄 el_init.3(20.41 KB)
📄 el_insertstr.3(20.41 KB)
📄 el_line.3(20.41 KB)
📄 el_parse.3(20.41 KB)
📄 el_push.3(20.41 KB)
📄 el_reset.3(20.41 KB)
📄 el_resize.3(20.41 KB)
📄 el_set.3(20.41 KB)
📄 el_source.3(20.41 KB)
📄 el_tok_end.3(20.41 KB)
📄 el_tok_init.3(20.41 KB)
📄 el_tok_line.3(20.41 KB)
📄 el_tok_reset.3(20.41 KB)
📄 el_tok_str.3(20.41 KB)
📄 ffi.3(850 B)
📄 ffi_call.3(2.28 KB)
📄 ffi_prep_cif.3(1.13 KB)
📄 ffi_prep_cif_var.3(1.29 KB)
📄 jemalloc.3(71.09 KB)
📄 libexslt.3(6.37 KB)
📄 libxml.3(1.59 KB)
📄 libxslt.3(816 B)
📄 zlib.3(4.37 KB)

Editing: dblink_get_result.3

'\" t
.\"     Title: dblink_get_result
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 2018
.\"    Manual: PostgreSQL 9.6.9 Documentation
.\"    Source: PostgreSQL 9.6.9
.\"  Language: English
.\"
.TH "DBLINK_GET_RESULT" "3" "2018" "PostgreSQL 9.6.9" "PostgreSQL 9.6.9 Documentation"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
dblink_get_result \- gets an async query result
.SH "SYNOPSIS"
.sp
.nf
dblink_get_result(text connname [, bool fail_on_error]) returns setof record
.fi
.SH "DESCRIPTION"
.PP
\fBdblink_get_result\fR
collects the results of an asynchronous query previously sent with
\fBdblink_send_query\fR\&. If the query is not already completed,
\fBdblink_get_result\fR
will wait until it is\&.
.SH "ARGUMENTS"
.PP
\fIconnname\fR
.RS 4
Name of the connection to use\&.
.RE
.PP
\fIfail_on_error\fR
.RS 4
If true (the default when omitted) then an error thrown on the remote side of the connection causes an error to also be thrown locally\&. If false, the remote error is locally reported as a NOTICE, and the function returns no rows\&.
.RE
.SH "RETURN VALUE"
.PP
For an async query (that is, a SQL statement returning rows), the function returns the row(s) produced by the query\&. To use this function, you will need to specify the expected set of columns, as previously discussed for
\fBdblink\fR\&.
.PP
For an async command (that is, a SQL statement not returning rows), the function returns a single row with a single text column containing the command\*(Aqs status string\&. It is still necessary to specify that the result will have a single text column in the calling
FROM
clause\&.
.SH "NOTES"
.PP
This function
\fImust\fR
be called if
\fBdblink_send_query\fR
returned 1\&. It must be called once for each query sent, and one additional time to obtain an empty set result, before the connection can be used again\&.
.PP
When using
\fBdblink_send_query\fR
and
\fBdblink_get_result\fR,
dblink
fetches the entire remote query result before returning any of it to the local query processor\&. If the query returns a large number of rows, this can result in transient memory bloat in the local session\&. It may be better to open such a query as a cursor with
\fBdblink_open\fR
and then fetch a manageable number of rows at a time\&. Alternatively, use plain
\fBdblink()\fR, which avoids memory bloat by spooling large result sets to disk\&.
.SH "EXAMPLES"
.sp
.if n \{\
.RS 4
.\}
.nf
contrib_regression=# SELECT dblink_connect(\*(Aqdtest1\*(Aq, \*(Aqdbname=contrib_regression\*(Aq);
 dblink_connect
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
 OK
(1 row)

contrib_regression=# SELECT * FROM
contrib_regression\-# dblink_send_query(\*(Aqdtest1\*(Aq, \*(Aqselect * from foo where f1 < 3\*(Aq) AS t1;
 t1
\-\-\-\-
  1
(1 row)

contrib_regression=# SELECT * FROM dblink_get_result(\*(Aqdtest1\*(Aq) AS t1(f1 int, f2 text, f3 text[]);
 f1 | f2 |     f3
\-\-\-\-+\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-
  0 | a  | {a0,b0,c0}
  1 | b  | {a1,b1,c1}
  2 | c  | {a2,b2,c2}
(3 rows)

contrib_regression=# SELECT * FROM dblink_get_result(\*(Aqdtest1\*(Aq) AS t1(f1 int, f2 text, f3 text[]);
 f1 | f2 | f3
\-\-\-\-+\-\-\-\-+\-\-\-\-
(0 rows)

contrib_regression=# SELECT * FROM
contrib_regression\-# dblink_send_query(\*(Aqdtest1\*(Aq, \*(Aqselect * from foo where f1 < 3; select * from foo where f1 > 6\*(Aq) AS t1;
 t1
\-\-\-\-
  1
(1 row)

contrib_regression=# SELECT * FROM dblink_get_result(\*(Aqdtest1\*(Aq) AS t1(f1 int, f2 text, f3 text[]);
 f1 | f2 |      f3
\-\-\-\-+\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
  7 | h  | {a7,b7,c7}
  8 | i  | {a8,b8,c8}
  9 | j  | {a9,b9,c9}
 10 | k  | {a10,b10,c10}
(4 rows)

contrib_regression=# SELECT * FROM dblink_get_result(\*(Aqdtest1\*(Aq) AS t1(f1 int, f2 text, f3 text[]);
 f1 | f2 | f3
\-\-\-\-+\-\-\-\-+\-\-\-\-
(0 rows)
.fi
.if n \{\
.RE
.\}

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Editing: dblink_get_result.3

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