You can also optionally change the name of beans variable names (which by default are set to be the same as the columns of the Employee table).

还可以更改bean变量的名称(默认情况下，bean变量的名称与Employee表列的名称相同)。

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Expression that evaluates either a string containing the name of an environment variable, or an integer corresponding to the numeric order of an environment string in the environment-string table.

表达式，计算为包含环境变量名称的字符串，或对应于环境字符串表中环境字符串的数字顺序的整数。

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