Gbase 8C annotation information function

col_description(table_oid, column_number)

describe ： Get the comment of a table field

Return type ：text

remarks ：col_description Return the comment of a field in the table , Through the table OID And field number to declare .

obj_description(object_oid, catalog_name)

describe ： Get the comment of a database object

Return type ：text

remarks ： With two parameters obj_description Return the comment of a database object , The object is through its OID And the name of the system table to which it belongs . such as ,obj_description(123456,'pg_class') Will return OID by 123456 Comments on the table . With only one parameter obj_description Only objects are required OID.

obj_description Cannot be used for table fields , Because the field does not have its own OID.

obj_description(object_oid)

describe ： Get the comment of a database object

Return type ：text

shobj_description(object_oid, catalog_name)

describe ： Get the comment of a shared database object

Return type ：text

remarks ：shobj_description and obj_description almost , The only difference is that the former is used to share objects . Some system tables are common to GBase 8c Global tables for all databases in , Therefore, the comments of these tables are also stored globally .