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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

java 图像用户界面开发中的一个简单的JOptionPane 例子，仅供参考学习。-java graphical user interface development in a simple JOptionPane example, learning is for reference only.

用JDOM读写XML的源代码，实现简单的读写XML功能，要先导JDOM的jar包，-To read and write XML with JDOM source code to achieve a simple read and write XML functionality, to the pilot JDOM the jar package,

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软件工程 Web技术与应用 实现简单关于TCP/IP协议的交互-Web technology and application of software engineering to achieve a simple on the TCPIP protocol interactions

java小程序，自己编的，希望能有点小帮组，按时地方按时的发-java applet, own the hope that it can help a bit small group, on time and local time of the fat

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java学习的好范例，是美国某大学学习java的参考范例-java learn example, is a university in the United States to learn java reference sample

JAVA 2面向对象程序设计(随书范例程序)10-12.rar-Java 2 object-oriented programming (with the book paradigm procedures) 10-12.rar

Java Base64编码库使您的Java应用程序进行编码和解码的Base64字符串和流。-The Java Base64 library enables your Java application to encode and decode base64 strings and streams.