When modeling the business process, make sure that the variable initialization happens prior to the human task invocation.

在对业务流程建模时，请确保在调用人工任务之前初始化流程变量。

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This variable is used to illustrate how to handle in the script, the verification that required environment variables must be defined prior to running the script.

该变量用于说明在脚本中如何处理，所需环境变量的验证必须在脚本执行前定义。

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Prior to the DB2 for I 6.1 release, SQL Update and Insert statements could use an indicator variable with a value of -1 to set a null capable column to the null value.

在DB 2 for i 6.1发布之前，SQL Update和insert语句能够使用一个值为- 1的指示符变量，将支持空值的列设置为空值。

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