MySQL/Oracle 添加/查看表注释和字段注释

一、Oracle 添加/查看表注释和字段注释

（1）添加表注释和字段注释

-- ----------------------------
-- Table structure for GW_CONCURRENT
-- ----------------------------
CREATE TABLE "GW_CONCURRENT"
(
    "ID"             NUMBER(19)         NOT NULL,
    "API_GROUP_ID"   NUMBER(19)         NOT NULL,
    "API_ID"         NUMBER(19)         NOT NULL,
    "CLUSTER_ID"     NUMBER(19)         NOT NULL,
    "CREATE_TIME"    TIMESTAMP(6)       NULL,
    "MODIFY_TIME"    TIMESTAMP(6)       NULL,
    "QUEUE"          NUMBER(10)         NULL,
    "REMARKS"        VARCHAR2(255 CHAR) NULL,
    "STATUS"         VARCHAR2(255 CHAR) NOT NULL
)
    LOGGING
    NOCOMPRESS
    NOCACHE
;
COMMENT ON TABLE "GW_CONCURRENT" IS '并发控制表';
COMMENT ON COLUMN "GW_CONCURRENT"."ID" IS 'id';
COMMENT ON COLUMN "GW_CONCURRENT"."CLUSTER_ID" IS '集群id';
COMMENT ON COLUMN "GW_CONCURRENT"."REMARKS" IS '简介';
COMMENT ON COLUMN "GW_CONCURRENT"."CREATE_TIME" IS '创建时间';
COMMENT ON COLUMN "GW_CONCURRENT"."MODIFY_TIME" IS '更新时间';
COMMENT ON COLUMN "GW_CONCURRENT"."STATUS" IS '状态';
COMMENT ON COLUMN "GW_CONCURRENT"."API_ID" IS 'apiID';
COMMENT ON COLUMN "GW_CONCURRENT"."API_GROUP_ID" IS 'api分组ID';

（2）查看表注释和字段注释

获取表注释。获得 table_name,table_type,comments。
select * from user_tab_comments; 
获取字段注释。获得 table_name,column_name,comments。
select * from user_col_comments;

二、MySQL 添加/查看表注释和字段注释

（1）添加表注释和字段注释

-- ----------------------------
-- Table structure for `gw_concurrent`
-- ----------------------------
CREATE TABLE `gw_concurrent`
(
    `id`             int(11)    NOT NULL AUTO_INCREMENT COMMENT '自增ID',
    `cluster_id`     int(11)    NOT NULL COMMENT '集群ID',
    `api_group_id`   int(11)    NOT NULL COMMENT 'api分组ID',
    `api_id`         int(11)    NOT NULL COMMENT 'apiID',
    `max_concurrent` int(11)    NOT NULL COMMENT '最大并发',
    `queue`          int(11)    NOT NULL COMMENT '队列大小',
    `status`         varchar(5) NOT NULL COMMENT '状态',
    `remarks`        varchar(255)    DEFAULT NULL COMMENT '简介',
    `create_time`    timestamp  NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
    `modify_time`    timestamp  NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
    PRIMARY KEY (`id`)
) ENGINE = InnoDB
  DEFAULT CHARSET = utf8 COMMENT ='并发控制表';

（2）查看表注释和字段注释

-- 表注释
  select * from information_schema.TABLES where TABLE_SCHEMA='数据库名' and TABLE_NAME='表名' 
  -- 字段注释
  show  full  columns  from  test1; 
   --在元数据的表里面看 
  select * from information_schema.COLUMNS where TABLE_SCHEMA='数据库名' and TABLE_NAME='表名' ;