oracle，mysql获取表和字段的注释

mysql取字段注释

SELECT COLUMN_NAME 列名, DATA_TYPE 字段类型, COLUMN_COMMENT 字段注释
FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_name = 'companies'##表名
AND table_schema = 'testhuicard'##数据库名
AND column_name LIKE 'c_name'##字段名

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例子：
SELECT COLUMN_COMMENT FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_name = 'admin'
AND table_schema = 'datas'
AND column_name LIKE 'name'

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mysql  SELECT table_name  表名,TABLE_COMMENT 表注释 FROM INFORMATION_SCHEMA.TABLES  WHERE table_schema = 'testhuicard' ##数据库名

AND table_name LIKE 'companies'##表名

参考http://dev.mysql.com/doc/refman/5.1/zh/information-schema.html.
mysql手册：23.1. INFORMATION_SCHEMA表

 

oracle

 

1.添加表注释

  comment on table table_name is 'comment_info';

2.添加列注释

 comment on column table_name.col_name is 'comment_info';

3获得表注释

select * from user_table_comments where table_name='table_name';

4.获取列注释

select * from user_col_comments where table_name='table_name';