MySQL导出库表字段信息

SELECT
	a.TABLE_SCHEMA AS 库名,
	a.TABLE_NAME AS 表名,
	a.COLUMN_NAME AS 字段名,
	a.COLUMN_TYPE AS 数据类型,
CASE
	IFNULL( A.COLUMN_DEFAULT, 'null' ) 
	WHEN '' THEN
	'空字符串' 
	WHEN 'null' THEN
	'null' ELSE A.COLUMN_DEFAULT 
	END AS 默认值,
CASE
	A.IS_NULLABLE 
	WHEN 'YES' THEN
	'是' ELSE '否' 
	END AS 是否允许为空,
	a.COLUMN_COMMENT AS '字段说明' 
FROM
	INFORMATION_SCHEMA.COLUMNS A 
WHERE
	a.TABLE_NAME = '表名' 
ORDER BY
	A.TABLE_SCHEMA,
	A.TABLE_NAME,
	A.ORDINAL_POSITION

select * from information_schema.columns where table_schema ='库名'  and table_name = '表名';