Gbase 8C session information function (II)

 current_schema[()]

describe ： Name of current mode .

return type ：name

Example ：

 gbase=# SELECT current_schema();

 current_schema

----------------

 public

(1 row)

remarks ：current_schema Returns the first valid pattern name in the search path .（ If the search path is empty, return NULL, No valid schema name is returned NULL）. If the target schema is not declared when creating tables or other named objects , The schema of these objects will be used .

current_schemas(Boolean)

describe ： Search the schema name in the path .

return type ：name[]

Example ：

 gbase=# SELECT current_schemas(true);

   current_schemas

---------------------

 {pg_catalog,public}

(1 row)

remarks ：

current_schemas(Boolean) Returns an array of all schema names in the search path . Boolean options determine things like pg_catalog Whether the implied system mode is included in the returned search path .

The search path can be changed through runtime settings . The order is ：

 SET search_path TO schema [, schema, ...]

current_user

describe ： The user name in the current execution environment .

return type ：name

Example ：

 gbase=# SELECT current_user;

 current_user

--------------

 gbase

(1 row)

remarks ：current_user Is the user ID used for permission check , Usually indicates a session user , But it can go through SET ROLE Order change . In the process of function execution , if SECURITY DEFINER Property change , Its value will also change .

definer_current_user

describe ： The user name in the current execution environment .

return type ：name

Example ：

 gbase=# SELECT definer_current_user();

 definer_current_user

----------------------

gbase

(1 row)