查看mysql表的备注等属性

SELECT
COLUMN_NAME,
DATA_TYPE AS `数据类型`,
CHARACTER_MAXIMUM_LENGTH AS `字符长度`,
NUMERIC_PRECISION AS `数字长度`,
NUMERIC_SCALE AS `小数位数`,
IS_NULLABLE AS `是否允许非空`,
CASE WHEN EXTRA = 'auto_increment' THEN 1 ELSE 0 END AS `是否自增`,
COLUMN_DEFAULT AS `默认值`,
COLUMN_COMMENT AS `备注`
FROM information_schema.COLUMNS WHERE TABLE_NAME='hxh_friends'