JDBC可调用语句中的命名参数。
也可以作为调用语句的out或input参数的实参进行修改。
They can also be changed by being the argument of an out or inout parameter in a call statement
因此，您可以计算多个数量，并轻松地将多个结果返回给调用语句。
Therefore, you can compute multiple quantities and easily return them to the calling statement.
可调用语句也需要先作准备，然后使用set方法设置它们的参数。
Callable statements also need to be prepared first, and then their parameters are set using the set methods. Parameters value can be set by either of two ways.
我们还建议您首次运行时打开跟踪功能，因此，将TRACE添加到调用语句。
We also suggest you make your first run with tracing on, so add the word TRACE to the invocation statement.
在创建预备语句（包括可调用语句）时，在创建时捕捉到 SQL字符串参数。
When creating a prepared statement (including a callable statement), the SQL string argument is captured at creation time.
showopts函数像以前一样分析选项，但是使用return语句将OPTIND变量的值返回给调用语句。
The showopts function analyzes the options as before, but USES the return statement to return the value of the OPTIND variable to the calling statement.
如果没有将该输出指派给一个变量，或者没有在别的地方将它用作调用语句的一部分，则shell将会尝试执行输出而不是显示输出。
If it is not assigned to a variable, or it is not otherwise used as part of the calling statement, then the shell will attempt to execute it rather than display it.
如果没有将该输出指派给一个变量，或者没有在别的地方将它用作调用语句的一部分，则shell将会尝试执行输出而不是显示输出。
If it is not assigned to a variable, or it is not otherwise used as part of the calling statement, then the shell will attempt to execute it rather than display it.
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