ALTER EXTENSION

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=====描述=====
 
=====描述=====
  
ALTER EXTENSION changes the definition of an installed extension. There are several subforms:
+
ALTER EXTENSION 改变一个已经安装的扩展的定义。有以下几种形式:
  
 
;UPDATE
 
;UPDATE
:This form updates the extension to a newer version. The extension must supply a suitable update script (or series of scripts) that can modify the currently-installed version into the requested version.
+
:这个形式将扩展升级至新版本。扩展必须提供一个(或几个)可以将当前已安装版本修改至新版本的脚本。
  
 
;SET SCHEMA
 
;SET SCHEMA
:This form moves the extension's objects into another schema. The extension has to be relocatable for this command to succeed.
+
:这个形式将扩展的对象移动到另一个模式中去。要成功执行这个命令,扩展需是可重定位的。
  
 
;ADD member_object
 
;ADD member_object
:This form adds an existing object to the extension. This is mainly useful in extension update scripts. The object will subsequently be treated as a member of the extension; notably, it can only be dropped by dropping the extension.
+
:这个形式将一个已有对象添加进扩展。该形式在扩展升级脚本中非常有用。添加之后对象被作为扩展的一个成员;值得注意的是,要丢弃这个对象的话,只能丢弃整个扩展。This form adds an existing object to the extension. This is mainly useful in extension update scripts. The object will subsequently be treated as a member of the extension; notably, it can only be dropped by dropping the extension.
  
 
;DROP member_object
 
;DROP member_object
:This form removes a member object from the extension. This is mainly useful in extension update scripts. The object is not dropped, only disassociated from the extension.
+
:这个形式将成员对象从扩展中移除。该形式在扩展升级脚本中非常有用。该对象并没有被丢弃,只是从扩展中移除出去。
  
See Section 35.15 for more information about these operations.
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关于这些操作的更多信息可以参见35.15节。
  
You must own the extension to use ALTER EXTENSION. The ADD/DROP forms require ownership of the added/dropped object as well.
+
你必须具有扩展的所有权才能执行ALTER EXTENSION命令。ADD/DROP命令需要被添加或移除对象的所有权。
  
 
=====参数=====
 
=====参数=====

Revision as of 14:37, 13 June 2013

Contents

名字

ALTER EXTENSION -- 修改一个扩展的定义

语法概要
   ALTER EXTENSION extension_name UPDATE [ TO new_version ]
   ALTER EXTENSION extension_name SET SCHEMA new_schema
   ALTER EXTENSION extension_name ADD member_object
   ALTER EXTENSION extension_name DROP member_object
   
   where member_object is:
   
     AGGREGATE agg_name (agg_type [, ...] ) |
     CAST (source_type AS target_type) |
     COLLATION object_name |
     CONVERSION object_name |
     DOMAIN object_name |
     FOREIGN DATA WRAPPER object_name |
     FOREIGN TABLE object_name |
     FUNCTION function_name ( [ [ argmode ] [ argname ] argtype [, ...] ] ) |
     OPERATOR operator_name (left_type, right_type) |
     OPERATOR CLASS object_name USING index_method |
     OPERATOR FAMILY object_name USING index_method |
     [ PROCEDURAL ] LANGUAGE object_name |
     SCHEMA object_name |
     SEQUENCE object_name |
     SERVER object_name |
     TABLE object_name |
     TEXT SEARCH CONFIGURATION object_name |
     TEXT SEARCH DICTIONARY object_name |
     TEXT SEARCH PARSER object_name |
     TEXT SEARCH TEMPLATE object_name |
     TYPE object_name |
     VIEW object_name
描述

ALTER EXTENSION 改变一个已经安装的扩展的定义。有以下几种形式:

UPDATE
这个形式将扩展升级至新版本。扩展必须提供一个(或几个)可以将当前已安装版本修改至新版本的脚本。
SET SCHEMA
这个形式将扩展的对象移动到另一个模式中去。要成功执行这个命令,扩展需是可重定位的。
ADD member_object
这个形式将一个已有对象添加进扩展。该形式在扩展升级脚本中非常有用。添加之后对象被作为扩展的一个成员;值得注意的是,要丢弃这个对象的话,只能丢弃整个扩展。This form adds an existing object to the extension. This is mainly useful in extension update scripts. The object will subsequently be treated as a member of the extension; notably, it can only be dropped by dropping the extension.
DROP member_object
这个形式将成员对象从扩展中移除。该形式在扩展升级脚本中非常有用。该对象并没有被丢弃,只是从扩展中移除出去。

关于这些操作的更多信息可以参见35.15节。

你必须具有扩展的所有权才能执行ALTER EXTENSION命令。ADD/DROP命令需要被添加或移除对象的所有权。

参数
extension_name
The name of an installed extension.
new_version
The desired new version of the extension. This can be written as either an identifier or a string literal. If not specified, ALTER EXTENSION UPDATE attempts to update to whatever is shown as the default version in the extension's control file.
new_schema
The new schema for the extension.
object_name
agg_name
function_name
operator_name
The name of an object to be added to or removed from the extension. Names of tables, aggregates, domains, foreign tables, functions, operators, operator classes, operator families, sequences, text search objects, types, and views can be schema-qualified.
agg_type
An input data type on which the aggregate function operates. To reference a zero-argument aggregate function, write * in place of the list of input data types.
source_type
The name of the source data type of the cast.
target_type
The name of the target data type of the cast.
argmode
The mode of a function argument: IN, OUT, INOUT, or VARIADIC. If omitted, the default is IN. Note that ALTER EXTENSION does not actually pay any attention to OUT arguments, since only the input arguments are needed to determine the function's identity. So it is sufficient to list the IN, INOUT, and VARIADIC arguments.
argname
The name of a function argument. Note that ALTER EXTENSION does not actually pay any attention to argument names, since only the argument data types are needed to determine the function's identity.
argtype
The data type(s) of the function's arguments (optionally schema-qualified), if any.
left_type
right_type
The data type(s) of the operator's arguments (optionally schema-qualified). Write NONE for the missing argument of a prefix or postfix operator.
PROCEDURAL
This is a noise word.
示例

To update the hstore extension to version 2.0:

   ALTER EXTENSION hstore UPDATE TO '2.0';

To change the schema of the hstore extension to utils:

   ALTER EXTENSION hstore SET SCHEMA utils;

To add an existing function to the hstore extension:

   ALTER EXTENSION hstore ADD FUNCTION populate_record(anyelement, hstore);
兼容性

ALTER EXTENSION 是PostgreSQL扩展。

参见

CREATE EXTENSION, DROP EXTENSION

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