When using the structure based IO method, RPG will create the initial storage for the input and output buffers, along with storage for the null indicator map.
使用基于结构的IO方法时，RPG将为输入和输出缓冲区创建初始存储空间，并为空指示符映射创建存储空间。
If the column is defined as null capable, then you must update the null indicator map accordingly.
如果列被定义为支持空值，那么您必须相应更新空指示符映射。
If the former is true, then the indicator variable for that column is set to -1 which results in the column being updated with the null value.
如果是前一种情况，那么该列的指示符变量被设置为- 1，这导致该列被更新为空值。
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