It is, however, recommended that you define the macro on the command-line, so you are absolutely certain that all headers are compiled the same way.
不过，建议你在命令行定义这个宏，这样你可以确保所有头文件以相同方式编译。
Define a database variable initially within the macro to tell it which database to connect to.
在宏内开头定义DATABASE变量告诉它要连接到哪一个数据库。
We also define a macro INBUFSIZ, which is the size of a character array used as a buffer while reading the input.
我们还定义了宏inbufsiz，它是在读取输入时用作缓冲区的字符数组的大小。
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