空指示符值在 SQL FETCH 语句执行过程中填充。
The null indicator values are populated during the execution of the SQL FETCH statement.
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 column is defined as null capable, then you must update the null indicator map accordingly.
空指示符值在执行SQL update语句之前通过RPG handle_update子过程设置。
The null indicator values are set by the RPG HANDLE_UPDATE sub-procedure prior to executing the SQL UPDATE statement.
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