存储过程和用户定义的函数必须先保存，然后才能运行。
Stored procedures and user-defined functions must be saved before you can run them.
托管代码必须先通过一个验证过程，然后才能运行(除非管理员已授权跳过该验证)。
Managed code must be passed through a verification process before it can be run (unless the administrator has granted permission to skip the verification).
db2_execute语句在完成时将返回true或false，而且必须将查询的结果集绑定到变量，然后才能运行sql语句。
The db2_execute statement returns true or false when completed, and the result set of the query must be bound to a variable before the SQL statement is run.
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