Initialize an empty stack and empty result string variable.

初始化一个空堆栈，将结果字符串变量置空。

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We define the SQL statement as a string variable for two reasons.

因为以下两个原因，我们将sql语句定义成了一个字符串变量。

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Maintain state, which here is represented by a simple string variable.

维护状态，例子中用了简单的字符串变量来代表。

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Then, the value from the Property text will assign to the string variable MyText.

然后，将来自属性(Property)文本的值分配给字符串变量MyText。

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Then, the value from the Property text will assign to the string variable MyText.

然后，将来自属性(Property)文本的值分配给字符串变量MyText。

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