'\" t
.\"     Title: dblink_exec
.\"    Author: The PostgreSQL Global Development Group
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 2021
.\"    Manual: PostgreSQL 9.6.24 Documentation
.\"    Source: PostgreSQL 9.6.24
.\"  Language: English
.\"
.TH "DBLINK_EXEC" "3" "2021" "PostgreSQL 9.6.24" "PostgreSQL 9.6.24 Documentation"
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.SH "NAME"
dblink_exec \- executes a command in a remote database
.SH "SYNOPSIS"
.sp
.nf
dblink_exec(text connname, text sql [, bool fail_on_error]) returns text
dblink_exec(text connstr, text sql [, bool fail_on_error]) returns text
dblink_exec(text sql [, bool fail_on_error]) returns text
.fi
.SH "DESCRIPTION"
.PP
\fBdblink_exec\fR
executes a command (that is, any SQL statement that doesn\*(Aqt return rows) in a remote database\&.
.PP
When two
text
arguments are given, the first one is first looked up as a persistent connection\*(Aqs name; if found, the command is executed on that connection\&. If not found, the first argument is treated as a connection info string as for
\fBdblink_connect\fR, and the indicated connection is made just for the duration of this command\&.
.SH "ARGUMENTS"
.PP
\fIconnname\fR
.RS 4
Name of the connection to use; omit this parameter to use the unnamed connection\&.
.RE
.PP
\fIconnstr\fR
.RS 4
A connection info string, as previously described for
\fBdblink_connect\fR\&.
.RE
.PP
\fIsql\fR
.RS 4
The SQL command that you wish to execute in the remote database, for example
insert into foo values(0, \*(Aqa\*(Aq, \*(Aq{"a0","b0","c0"}\*(Aq)\&.
.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\*(Aqs return value is set to
ERROR\&.
.RE
.SH "RETURN VALUE"
.PP
Returns status, either the command\*(Aqs status string or
ERROR\&.
.SH "EXAMPLES"
.sp
.if n \{\
.RS 4
.\}
.nf
SELECT dblink_connect(\*(Aqdbname=dblink_test_standby\*(Aq);
 dblink_connect
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
 OK
(1 row)

SELECT dblink_exec(\*(Aqinsert into foo values(21, \*(Aq\*(Aqz\*(Aq\*(Aq, \*(Aq\*(Aq{"a0","b0","c0"}\*(Aq\*(Aq);\*(Aq);
   dblink_exec
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
 INSERT 943366 1
(1 row)

SELECT dblink_connect(\*(Aqmyconn\*(Aq, \*(Aqdbname=regression\*(Aq);
 dblink_connect
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
 OK
(1 row)

SELECT dblink_exec(\*(Aqmyconn\*(Aq, \*(Aqinsert into foo values(21, \*(Aq\*(Aqz\*(Aq\*(Aq, \*(Aq\*(Aq{"a0","b0","c0"}\*(Aq\*(Aq);\*(Aq);
   dblink_exec
\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
 INSERT 6432584 1
(1 row)

SELECT dblink_exec(\*(Aqmyconn\*(Aq, \*(Aqinsert into pg_class values (\*(Aq\*(Aqfoo\*(Aq\*(Aq)\*(Aq,false);
NOTICE:  sql error
DETAIL:  ERROR:  null value in column "relnamespace" violates not\-null constraint

 dblink_exec
\-\-\-\-\-\-\-\-\-\-\-\-\-
 ERROR
(1 row)
.fi
.if n \{\
.RE
.\}