获取MySQL表中的列数？
要获取列的数量，请使用MySQL中的information_schema表的聚合函数count(*)。语法如下，以查找列的数量：
SELECT COUNT(*) as anyVariableName from INFORMATION_SCHEMA.COLUMNS where table_schema = ’yourDatabaseName’ and table_name = ’yourTableName’;登录后复制
mysql> create table CountColumns −> ( −> Bookid int, −> BookName varchar(200), −> BookAuthorName varchar(200), −> BookPublishedDate datetime −> ); Query OK, 0 rows affected (0.69 sec)登录后复制
mysql> SELECT COUNT(*) as NumberofColumns FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = 'business' −> and table_name = 'CountColumns';登录后复制
+-----------------+ | NumberofColumns | +-----------------+ | 4 | +-----------------+ 1 row in set (0.00 sec)登录后复制
