Using every declaration just once means making strict use of selector grouping.
每种声明只使用一次意味着对选择器进行更加严格的分组。
ODBC applications do not require the explicit declaration and use of host variables.
ODBC应用程序不需要显式声明,也不需要使用宿主变量。
It separates the declaration of the variable from its use, making the code a little harder to follow.
它将变量的声明与其使用分离开来,使代码的易读性降低。
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