If the database already exists, a connection is established and a SQLWarning is issued.
如果该数据库已经存在，就会建立连接并发出SQLWarning。
Before calling the method, you first check that there is at least one SQL warning; if so, you pass the first SQLWarning object to the appropriate method.
在调用这个方法之前，首先要检查是否至少有一个SQL警告；如果有，就将第一个SQLWarning对象传递给适当的方法。
The SQLWarning class inherits from the SQLException class; however, a SQL warning is less severe than an SQL exception, so it's better to handle them separately.
sqlwarning类继承自sqlexception类；但是SQL警告不如SQL异常那么严重，所以更好的方法是分别处理它们。
If a statement in your SQL procedure raises an SQLWARNING or NOT FOUND condition and if you have declared a handler for the respective condition, DB2 passes control to the corresponding handler.
如果SQL过程中有一个语句发出SQLWARNING或NOTFOUND条件，并且为相应的条件声明了一个处理程序，那么DB 2将把控制转移到相应的处理程序。
If a statement in your SQL procedure raises an SQLWARNING or NOT FOUND condition and if you have declared a handler for the respective condition, DB2 passes control to the corresponding handler.
如果SQL过程中有一个语句发出SQLWARNING或NOTFOUND条件，并且为相应的条件声明了一个处理程序，那么DB 2将把控制转移到相应的处理程序。
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