Oracle 下读取表/字段的备注信息
Oracle 通过COMMENT ON TABLE / COMMENT ON COLUMN 追加表/字段的备注。

CREATE TABLE "MR_DEPT" (
"DEPT_ID" NUMBER NOT NULL ,
"PARENT_ID" NUMBER,
"DEPT_NAME" CHAR(20) NOT NULL ,
"STATUS" NUMBER DEFAULT 1 NOT NULL ,
PRIMARY KEY ("DEPT_ID")
);

COMMENT ON TABLE "MR_DEPT" IS '部门表';
COMMENT ON COLUMN "MR_DEPT"."DEPT_ID" IS '部门编号';
COMMENT ON COLUMN "MR_DEPT"."PARENT_ID" IS '上级部门编号';
COMMENT ON COLUMN "MR_DEPT"."DEPT_NAME" IS '部门名';
COMMENT ON COLUMN "MR_DEPT"."STATUS" IS '状态';

备注加好以后，如何在查询中检索呢？


查询表的备注信息
SELECT
TABLE_NAME,
TABLE_TYPE,
COMMENTS
FROM
USER_TAB_COMMENTS
WHERE
TABLE_NAME = 'MR_DEPT;

查询字段的备注信息

SELECT
TABLE_NAME,
COLUMN_NAME,
COMMENTS
FROM
USER_COL_COMMENTS
WHERE
TABLE_NAME = 'MR_DEPT;