alter table tbl_name add col_name type
例如,给表增加一列weight
mysql>alter table...
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alter table tbl_name add col_name type
例如,给表增加一列weight
mysql>alter table pet add weight int
删除列
alter table tbl_name drop col_name
例如，删除列weight：
mysql>alter table pet drop weight
改变列
alter table tbl_name modify col_name type
例如，改变weight的类型：
mysql> alter table pet modify weight samllint
另一种方法是：
alter table tbl_name change old_col_name col_name type
例如：
mysql> alter table pet change weight weight samllint
给列更名
mysql>alter table pet change weight wei
给表更名
alter table tbl_name rename new_tbl
例如，把pet表更名为animal
mysql>alter table pet rename animal
-alter table tbl_name add col_name type for example, to form an increase in weight mysql> alter table pet add weight int Remove Columns alter table tbl_name drop col_name For example, the deletion of column weight: mysql> alter table pet drop weight change out alter table tbl_name modify col_name type for example, the type of weight change: mysql> alter table pet modify w
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Struts 2中实现文件下载（修正中文问题）.docx
