要将_email操作对象中的数据字段定义为常数值，请执行以下操作。

To define a data field in the _email action object as a constant value.

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锁模式和锁对象类型都定义在sqlmon . h包含文件中，该文件将有助于破解表函数返回的数值当量(numerical equivalent)。

Lock modes and lock object types are defined in the sqlmon.h include file, which will help you to decipher the numerical equivalents that the table function returns.

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Rails同时为许多其他对象提供了合理的blank ？定义：true, false，空数组及哈希表，数值类型，甚至是Object类本身。

Rails provides reasonable definitions of blank? For several other objects too: true, false, empty arrays or hashes, numeric types, and even the object class.

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