USE information_schema;
SELECT
  C.TABLE_NAME  AS '表名',
    C.COLUMN_NAME AS '字段名',
    C.COLUMN_TYPE AS '数据类型',
    C.COLUMN_COMMENT AS '字段说明'
FROM
    COLUMNS C
INNER JOIN TABLES T ON C.TABLE_SCHEMA = T.TABLE_SCHEMA
AND C.TABLE_NAME = T.TABLE_NAME
WHERE
    T.TABLE_SCHEMA = '${dbName}'