Postgresql 中文操作指南
ALTER POLICY
ALTER POLICY — 更改行级安全策略的定义
ALTER POLICY — change the definition of a row-level security policy
Synopsis
ALTER POLICY name ON table_name RENAME TO new_name
ALTER POLICY name ON table_name
[ TO { role_name | PUBLIC | CURRENT_ROLE | CURRENT_USER | SESSION_USER } [, ...] ]
[ USING ( using_expression ) ]
[ WITH CHECK ( check_expression ) ]Description
ALTER POLICY 更改一个现有行级安全策略的定义。请注意， ALTER POLICY 只允许修改策略适用的角色集以及 USING 和 WITH CHECK 表达式。如要更改策略的其他属性（例如适用的命令，或者它是否为宽容的或限制的），则必须删除并重新创建该策略。
ALTER POLICY changes the definition of an existing row-level security policy. Note that ALTER POLICY only allows the set of roles to which the policy applies and the USING and WITH CHECK expressions to be modified. To change other properties of a policy, such as the command to which it applies or whether it is permissive or restrictive, the policy must be dropped and recreated.
如要使用 ALTER POLICY ，你必须拥有应用该策略的表的拥有权。
To use ALTER POLICY, you must own the table that the policy applies to.
在 ALTER POLICY 的第二种形式中，角色列表 using_expression 和 check_expression 在指定时会分别进行替换。当省略其中一个子句时，对应部分的策略保持不变。
In the second form of ALTER POLICY, the role list, using_expression, and check_expression are replaced independently if specified. When one of those clauses is omitted, the corresponding part of the policy is unchanged.
Parameters
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name
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The name of an existing policy to alter.
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table_name
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The name (optionally schema-qualified) of the table that the policy is on.
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new_name
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The new name for the policy.
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role_name
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The role(s) to which the policy applies. Multiple roles can be specified at one time. To apply the policy to all roles, use PUBLIC.
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using_expression
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The USING expression for the policy. See CREATE POLICY for details.
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check_expression
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The WITH CHECK expression for the policy. See CREATE POLICY for details.
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