As an additional feature, the function also tests whether the global position of the new row already appears in the parent path.
作为附加的功能,该函数还测试新行的全局位置是否已经出现在父路径中。
NEXT you use the before first command to position the cursor before the first row so that you can call the NEXT command to access the first row in the cursor.
接下来,使用BEFORE FIRST命令把游标定位到第一行之前,这样才可以调用NEXT命令来访问游标中的第一行。
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