ibatis dynamic sql

最新推荐文章于 2024-02-22 10:27:29 发布

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#SQL #iBATIS #Bean

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本文介绍了几种用于检查对象属性状态的方法，包括是否存在、是否为空、是否为null等。这些方法适用于bean和map类型的数据结构，对于进行数据验证和条件判断非常有用。

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<isProperty-Available>

Determines whether the specified property exists in the parameter. With a bean, it looks for a property. With a map, it looks for a key.

<isNotProperty-Available>

Checks whether the specified property does not exist in the parameter. With a bean, it looks for a property. With a map, it looks for a key.
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<isNull>

Determines whether the specified property is null. With a bean, it looks at the value of the property getter. With a map, it looks for a key. If the key does not exist, it will return true.

<isNotNull>

Determines whether the specified property is anything other than null. With a bean, it looks at the value of the property getter. With a map, it looks for a key. If the key does not exist, it will return false. _________________________________________________________________________________

<isEmpty>

Determines whether the specified property is a null or empty String, Collection,or String.valueOf().

<isNotEmpty>

Determines whether the specified property is not a null or empty String,Collection, or String.valueOf().