获取MySQL表中的列数？

SELECT COUNT(*) as anyVariableName from INFORMATION_SCHEMA.COLUMNS where table_schema = ’yourDatabaseName’ and table_name = ’yourTableName’;

mysql> create table CountColumns
−> (
   −> Bookid int,
   −> BookName varchar(200),
   −> BookAuthorName varchar(200),
   −> BookPublishedDate datetime
−> );
Query OK, 0 rows affected (0.69 sec)

mysql> SELECT COUNT(*) as NumberofColumns FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = 'business'
−> and table_name = 'CountColumns';

+-----------------+
| NumberofColumns |
+-----------------+
| 4               |
+-----------------+
1 row in set (0.00 sec)