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最近要做一个软件升级，其中涉及到数据库表字段的变动(新增或删除或修改)，所有的关于数据库的变动的sql语句都是存放在Sqlupdate.sql文件中，每次升级的时候都需要执行一次Sqlupdate.sql里的所有sql语句，这就涉及到执行多条语句的问题了。软件在CodeIgniter框架上开发的，CodeIgniter有封装好的执行sql语句的函数：$this->db->query('****')，但此函数一次只能执行一条sql语句。所以得另外想办法了。百度了下，找到了一些资料。multi_query()方法是完全按照在sql环境下的语句执行，所以可以一次执行多条sql语句(按sql语法拼写，每条语句以;结束)。
$mysqli = new
mysqli($this->db->hostname,$this->db->username,$this->db->password,$this->db->database);
//连接MySQL数据库
if ($mysqli->connect_errno) { //判断是否连接成功printf("Connect failed: %s\n",
$mysqli->connect_error);exit();
}$mysqli->multi_query($dataStr); //执行sql语句
以下是百度到的参考资料：
使用mysqli对象中的query()方法每次调用只能执行一条SQL命令。如果需要一次执行多条SQL命令，就必须使用mysqli对象中的
multi_query()方法。具体做法是把多条SQL命令写在同一个字符串里作为参数传递给multi_query()方法，多条SQL之间使用分号
(;)分隔。如果第一条SQL命令在执行时没有出错，这个方法就会返回TRUE
