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📄 ABORT.7(2.17 KB)
📄 ALTER_AGGREGATE.7(4.97 KB)
📄 ALTER_COLLATION.7(2.8 KB)
📄 ALTER_CONVERSION.7(2.89 KB)
📄 ALTER_DATABASE.7(5.71 KB)
📄 ALTER_DEFAULT_PRIVILEGES.7(6.34 KB)
📄 ALTER_DOMAIN.7(6.96 KB)
📄 ALTER_EVENT_TRIGGER.7(2.42 KB)
📄 ALTER_EXTENSION.7(6.89 KB)
📄 ALTER_FOREIGN_DATA_WRAPPER.7(4.56 KB)
📄 ALTER_FOREIGN_TABLE.7(12.8 KB)
📄 ALTER_FUNCTION.7(8.26 KB)
📄 ALTER_GROUP.7(3.08 KB)
📄 ALTER_INDEX.7(5.59 KB)
📄 ALTER_LANGUAGE.7(2.1 KB)
📄 ALTER_LARGE_OBJECT.7(1.97 KB)
📄 ALTER_MATERIALIZED_VIEW.7(4.66 KB)
📄 ALTER_OPERATOR.7(3.67 KB)
📄 ALTER_OPERATOR_CLASS.7(2.86 KB)
📄 ALTER_OPERATOR_FAMILY.7(9.12 KB)
📄 ALTER_POLICY.7(2.88 KB)
📄 ALTER_ROLE.7(9.04 KB)
📄 ALTER_RULE.7(2.21 KB)
📄 ALTER_SCHEMA.7(2.31 KB)
📄 ALTER_SEQUENCE.7(7.53 KB)
📄 ALTER_SERVER.7(3.41 KB)
📄 ALTER_SYSTEM.7(3.8 KB)
📄 ALTER_TABLE.7(35.2 KB)
📄 ALTER_TABLESPACE.7(3.35 KB)
📄 ALTER_TEXT_SEARCH_CONFIGURATION.7(4.79 KB)
📄 ALTER_TEXT_SEARCH_DICTIONARY.7(4.02 KB)
📄 ALTER_TEXT_SEARCH_PARSER.7(2.23 KB)
📄 ALTER_TEXT_SEARCH_TEMPLATE.7(2.26 KB)
📄 ALTER_TRIGGER.7(2.98 KB)
📄 ALTER_TYPE.7(7.15 KB)
📄 ALTER_USER.7(2.66 KB)
📄 ALTER_USER_MAPPING.7(3.26 KB)
📄 ALTER_VIEW.7(4.67 KB)
📄 ANALYZE.7(7.67 KB)
📄 BEGIN.7(4.06 KB)
📄 CHECKPOINT.7(2.29 KB)
📄 CLOSE.7(2.72 KB)
📄 CLUSTER.7(6.23 KB)
📄 COMMENT.7(10.2 KB)
📄 COMMIT.7(2.1 KB)
📄 COMMIT_PREPARED.7(2.58 KB)
📄 COPY.7(29.88 KB)
📄 CREATE_ACCESS_METHOD.7(2.9 KB)
📄 CREATE_AGGREGATE.7(23.35 KB)
📄 CREATE_CAST.7(13.55 KB)
📄 CREATE_COLLATION.7(3.97 KB)
📄 CREATE_CONVERSION.7(3.78 KB)
📄 CREATE_DATABASE.7(8.48 KB)
📄 CREATE_DOMAIN.7(6.52 KB)
📄 CREATE_EVENT_TRIGGER.7(3.74 KB)
📄 CREATE_EXTENSION.7(6.57 KB)
📄 CREATE_FOREIGN_DATA_WRAPPER.7(4.96 KB)
📄 CREATE_FOREIGN_TABLE.7(9 KB)
📄 CREATE_FUNCTION.7(24.73 KB)
📄 CREATE_GROUP.7(2.11 KB)
📄 CREATE_INDEX.7(19.56 KB)
📄 CREATE_LANGUAGE.7(9.83 KB)
📄 CREATE_MATERIALIZED_VIEW.7(4.21 KB)
📄 CREATE_OPERATOR.7(6.88 KB)
📄 CREATE_OPERATOR_CLASS.7(8.52 KB)
📄 CREATE_OPERATOR_FAMILY.7(3.6 KB)
📄 CREATE_POLICY.7(15.92 KB)
📄 CREATE_ROLE.7(12.69 KB)
📄 CREATE_RULE.7(8.63 KB)
📄 CREATE_SCHEMA.7(6.15 KB)
📄 CREATE_SEQUENCE.7(9.79 KB)
📄 CREATE_SERVER.7(3.63 KB)
📄 CREATE_TABLE.7(42.1 KB)
📄 CREATE_TABLESPACE.7(4.47 KB)
📄 CREATE_TABLE_AS.7(7.8 KB)
📄 CREATE_TEXT_SEARCH_CONFIGURATION.7(3.19 KB)
📄 CREATE_TEXT_SEARCH_DICTIONARY.7(3.34 KB)
📄 CREATE_TEXT_SEARCH_PARSER.7(3.56 KB)
📄 CREATE_TEXT_SEARCH_TEMPLATE.7(3.38 KB)
📄 CREATE_TRANSFORM.7(5.79 KB)
📄 CREATE_TRIGGER.7(16.3 KB)
📄 CREATE_TYPE.7(28.96 KB)
📄 CREATE_USER.7(2.45 KB)
📄 CREATE_USER_MAPPING.7(3.27 KB)
📄 CREATE_VIEW.7(14.63 KB)
📄 DEALLOCATE.7(1.98 KB)
📄 DECLARE.7(10.22 KB)
📄 DELETE.7(7.36 KB)
📄 DISCARD.7(2.81 KB)
📄 DO.7(3.08 KB)
📄 DROP_ACCESS_METHOD.7(2.35 KB)
📄 DROP_AGGREGATE.7(3.8 KB)
📄 DROP_CAST.7(2.26 KB)
📄 DROP_COLLATION.7(2.42 KB)
📄 DROP_CONVERSION.7(2.36 KB)
📄 DROP_DATABASE.7(2.38 KB)
📄 DROP_DOMAIN.7(2.34 KB)
📄 DROP_EVENT_TRIGGER.7(2.38 KB)
📄 DROP_EXTENSION.7(2.73 KB)
📄 DROP_FOREIGN_DATA_WRAPPER.7(2.61 KB)
📄 DROP_FOREIGN_TABLE.7(2.59 KB)
📄 DROP_FUNCTION.7(3.35 KB)
📄 DROP_GROUP.7(1.57 KB)
📄 DROP_INDEX.7(3.08 KB)
📄 DROP_LANGUAGE.7(2.86 KB)
📄 DROP_MATERIALIZED_VIEW.7(2.64 KB)
📄 DROP_OPERATOR.7(3.01 KB)
📄 DROP_OPERATOR_CLASS.7(3.48 KB)
📄 DROP_OPERATOR_FAMILY.7(3.24 KB)
📄 DROP_OWNED.7(3.14 KB)
📄 DROP_POLICY.7(2.53 KB)
📄 DROP_ROLE.7(3.05 KB)
📄 DROP_RULE.7(2.35 KB)
📄 DROP_SCHEMA.7(2.76 KB)
📄 DROP_SEQUENCE.7(2.46 KB)
📄 DROP_SERVER.7(2.39 KB)
📄 DROP_TABLE.7(2.97 KB)
📄 DROP_TABLESPACE.7(2.48 KB)
📄 DROP_TEXT_SEARCH_CONFIGURATION.7(2.83 KB)
📄 DROP_TEXT_SEARCH_DICTIONARY.7(2.75 KB)
📄 DROP_TEXT_SEARCH_PARSER.7(2.66 KB)
📄 DROP_TEXT_SEARCH_TEMPLATE.7(2.69 KB)
📄 DROP_TRANSFORM.7(2.59 KB)
📄 DROP_TRIGGER.7(2.6 KB)
📄 DROP_TYPE.7(2.53 KB)
📄 DROP_USER.7(1.65 KB)
📄 DROP_USER_MAPPING.7(2.56 KB)
📄 DROP_VIEW.7(2.43 KB)
📄 END.7(2.19 KB)
📄 EXECUTE.7(2.9 KB)
📄 EXPLAIN.7(13.03 KB)
📄 FETCH.7(8.48 KB)
📄 GRANT.7(21.29 KB)
📄 IMPORT_FOREIGN_SCHEMA.7(3.98 KB)
📄 INSERT.7(19.61 KB)
📄 LISTEN.7(3.51 KB)
📄 LOAD.7(2.54 KB)
📄 LOCK.7(8.01 KB)
📄 MOVE.7(2.92 KB)
📄 NOTIFY.7(8.21 KB)
📄 PREPARE.7(8.2 KB)
📄 PREPARE_TRANSACTION.7(5.74 KB)
📄 REASSIGN_OWNED.7(3.01 KB)
📄 REFRESH_MATERIALIZED_VIEW.7(3.92 KB)
📄 REINDEX.7(7.69 KB)
📄 RELEASE_SAVEPOINT.7(3 KB)
📄 RESET.7(2.93 KB)
📄 REVOKE.7(10.44 KB)
📄 ROLLBACK.7(2.09 KB)
📄 ROLLBACK_PREPARED.7(2.6 KB)
📄 ROLLBACK_TO_SAVEPOINT.7(3.94 KB)
📄 SAVEPOINT.7(3.5 KB)
📄 SECURITY_LABEL.7(5.39 KB)
📄 SELECT.7(63.33 KB)
📄 SELECT_INTO.7(4.37 KB)
📄 SET.7(7.57 KB)
📄 SET_CONSTRAINTS.7(4.48 KB)
📄 SET_ROLE.7(4.36 KB)
📄 SET_SESSION_AUTHORIZATION.7(3.88 KB)
📄 SET_TRANSACTION.7(8.27 KB)
📄 SHOW.7(4.22 KB)
📄 START_TRANSACTION.7(2.9 KB)
📄 TABLE.7(18 B)
📄 TRUNCATE.7(6.39 KB)
📄 UNLISTEN.7(2.75 KB)
📄 UPDATE.7(12.26 KB)
📄 VACUUM.7(7.92 KB)
📄 VALUES.7(6.94 KB)
📄 WITH.7(18 B)

Editing: CREATE_FOREIGN_DATA_WRAPPER.7

'\" t
.\"     Title: CREATE FOREIGN DATA WRAPPER
.\"    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 "CREATE FOREIGN DATA WRAPPER" "7" "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"
CREATE_FOREIGN_DATA_WRAPPER \- define a new foreign\-data wrapper
.SH "SYNOPSIS"
.sp
.nf
CREATE FOREIGN DATA WRAPPER \fIname\fR
    [ HANDLER \fIhandler_function\fR | NO HANDLER ]
    [ VALIDATOR \fIvalidator_function\fR | NO VALIDATOR ]
    [ OPTIONS ( \fIoption\fR \*(Aq\fIvalue\fR\*(Aq [, \&.\&.\&. ] ) ]
.fi
.SH "DESCRIPTION"
.PP
\fBCREATE FOREIGN DATA WRAPPER\fR
creates a new foreign\-data wrapper\&. The user who defines a foreign\-data wrapper becomes its owner\&.
.PP
The foreign\-data wrapper name must be unique within the database\&.
.PP
Only superusers can create foreign\-data wrappers\&.
.SH "PARAMETERS"
.PP
\fIname\fR
.RS 4
The name of the foreign\-data wrapper to be created\&.
.RE
.PP
HANDLER \fIhandler_function\fR
.RS 4
\fIhandler_function\fR
is the name of a previously registered function that will be called to retrieve the execution functions for foreign tables\&. The handler function must take no arguments, and its return type must be
fdw_handler\&.
.sp
It is possible to create a foreign\-data wrapper with no handler function, but foreign tables using such a wrapper can only be declared, not accessed\&.
.RE
.PP
VALIDATOR \fIvalidator_function\fR
.RS 4
\fIvalidator_function\fR
is the name of a previously registered function that will be called to check the generic options given to the foreign\-data wrapper, as well as options for foreign servers, user mappings and foreign tables using the foreign\-data wrapper\&. If no validator function or
NO VALIDATOR
is specified, then options will not be checked at creation time\&. (Foreign\-data wrappers will possibly ignore or reject invalid option specifications at run time, depending on the implementation\&.) The validator function must take two arguments: one of type
text[], which will contain the array of options as stored in the system catalogs, and one of type
oid, which will be the OID of the system catalog containing the options\&. The return type is ignored; the function should report invalid options using the
\fBereport(ERROR)\fR
function\&.
.RE
.PP
OPTIONS ( \fIoption\fR \*(Aq\fIvalue\fR\*(Aq [, \&.\&.\&. ] )
.RS 4
This clause specifies options for the new foreign\-data wrapper\&. The allowed option names and values are specific to each foreign data wrapper and are validated using the foreign\-data wrapper\*(Aqs validator function\&. Option names must be unique\&.
.RE
.SH "NOTES"
.PP
PostgreSQL\*(Aqs foreign\-data functionality is still under active development\&. Optimization of queries is primitive (and mostly left to the wrapper, too)\&. Thus, there is considerable room for future performance improvements\&.
.SH "EXAMPLES"
.PP
Create a useless foreign\-data wrapper
dummy:
.sp
.if n \{\
.RS 4
.\}
.nf
CREATE FOREIGN DATA WRAPPER dummy;
.fi
.if n \{\
.RE
.\}
.PP
Create a foreign\-data wrapper
file
with handler function
file_fdw_handler:
.sp
.if n \{\
.RS 4
.\}
.nf
CREATE FOREIGN DATA WRAPPER file HANDLER file_fdw_handler;
.fi
.if n \{\
.RE
.\}
.PP
Create a foreign\-data wrapper
mywrapper
with some options:
.sp
.if n \{\
.RS 4
.\}
.nf
CREATE FOREIGN DATA WRAPPER mywrapper
    OPTIONS (debug \*(Aqtrue\*(Aq);
.fi
.if n \{\
.RE
.\}
.SH "COMPATIBILITY"
.PP
\fBCREATE FOREIGN DATA WRAPPER\fR
conforms to ISO/IEC 9075\-9 (SQL/MED), with the exception that the
HANDLER
and
VALIDATOR
clauses are extensions and the standard clauses
LIBRARY
and
LANGUAGE
are not implemented in
PostgreSQL\&.
.PP
Note, however, that the SQL/MED functionality as a whole is not yet conforming\&.
.SH "SEE ALSO"
ALTER FOREIGN DATA WRAPPER (\fBALTER_FOREIGN_DATA_WRAPPER\fR(7)), DROP FOREIGN DATA WRAPPER (\fBDROP_FOREIGN_DATA_WRAPPER\fR(7)), CREATE SERVER (\fBCREATE_SERVER\fR(7)), CREATE USER MAPPING (\fBCREATE_USER_MAPPING\fR(7)), CREATE FOREIGN TABLE (\fBCREATE_FOREIGN_TABLE\fR(7))

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