使用information_schema库便捷制作数据字典

SELECT
   C.TABLE_SCHEMA AS '库名',
   T.TABLE_NAME AS '表名',
   T.TABLE_COMMENT AS '表注释',
   C.COLUMN_NAME AS '列名',
   C.COLUMN_COMMENT AS '列注释',
   C.ORDINAL_POSITION AS '列的排列顺序',
   C.COLUMN_DEFAULT AS '默认值',
   C.IS_NULLABLE AS '是否为空',
   C.DATA_TYPE AS '数据类型',
   C.CHARACTER_MAXIMUM_LENGTH AS '字符最大长度',
   C.NUMERIC_PRECISION AS '数值精度(最大位数)',
   C.NUMERIC_SCALE AS '小数精度',
   C.COLUMN_TYPE AS 列类型,
   C.COLUMN_KEY 'KEY',
   C.EXTRA AS '额外说明',create_time,update_time
FROM
   information_schema.`TABLES` T
LEFT JOIN information_schema.`COLUMNS` C ON T.TABLE_NAME = C.TABLE_NAME
AND T.TABLE_SCHEMA = C.TABLE_SCHEMA
WHERE
   T.TABLE_SCHEMA = 'iov' AND T.TABLE_NAME='t_store_info'
ORDER BY
   C.TABLE_NAME,
   C.ORDINAL_POSITION;