Postgresql 中文操作指南
ALTER FOREIGN DATA WRAPPER
ALTER FOREIGN DATA WRAPPER — 更改外部数据包装器的定义
ALTER FOREIGN DATA WRAPPER — change the definition of a foreign-data wrapper
Synopsis
ALTER FOREIGN DATA WRAPPER name
[ HANDLER handler_function | NO HANDLER ]
[ VALIDATOR validator_function | NO VALIDATOR ]
[ OPTIONS ( [ ADD | SET | DROP ] option ['value'] [, ... ]) ]
ALTER FOREIGN DATA WRAPPER name OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER FOREIGN DATA WRAPPER name RENAME TO new_nameDescription
ALTER FOREIGN DATA WRAPPER 更改外部数据包装器的定义。命令的第一个形式会更改外部数据包装器的支持函数或通用选项（至少需要一个子句）。第二个形式会更改外部数据包装器的所有者。
ALTER FOREIGN DATA WRAPPER changes the definition of a foreign-data wrapper. The first form of the command changes the support functions or the generic options of the foreign-data wrapper (at least one clause is required). The second form changes the owner of the foreign-data wrapper.
只有超级用户才能更改外部数据包装器。此外，只有超级用户才能拥有外部数据包装器。
Only superusers can alter foreign-data wrappers. Additionally, only superusers can own foreign-data wrappers.
Parameters
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name
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The name of an existing foreign-data wrapper.
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HANDLER _handler_function_
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Specifies a new handler function for the foreign-data wrapper.
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NO HANDLER
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This is used to specify that the foreign-data wrapper should no longer have a handler function.
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Note that foreign tables that use a foreign-data wrapper with no handler cannot be accessed.
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VALIDATOR _validator_function_
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Specifies a new validator function for the foreign-data wrapper.
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Note that it is possible that pre-existing options of the foreign-data wrapper, or of dependent servers, user mappings, or foreign tables, are invalid according to the new validator. PostgreSQL does not check for this. It is up to the user to make sure that these options are correct before using the modified foreign-data wrapper. However, any options specified in this ALTER FOREIGN DATA WRAPPER command will be checked using the new validator.
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NO VALIDATOR
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This is used to specify that the foreign-data wrapper should no longer have a validator function.
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OPTIONS ( [ ADD | SET | DROP ] _option ['value'] [, … ] )_
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Change options for the foreign-data wrapper. ADD, SET, and DROP specify the action to be performed. ADD is assumed if no operation is explicitly specified. Option names must be unique; names and values are also validated using the foreign data wrapper’s validator function, if any.
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new_owner
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The user name of the new owner of the foreign-data wrapper.
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new_name
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The new name for the foreign-data wrapper.
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Examples
更改外键数据包装器 dbi ，添加选项 foo ，删除 bar ：
Change a foreign-data wrapper dbi, add option foo, drop bar:
ALTER FOREIGN DATA WRAPPER dbi OPTIONS (ADD foo '1', DROP bar);将外键数据包装器 dbi 验证程序更改为 bob.myvalidator ：
Change the foreign-data wrapper dbi validator to bob.myvalidator:
ALTER FOREIGN DATA WRAPPER dbi VALIDATOR bob.myvalidator;