resultType和resultMap都是结果集映射成POJO的，2个不能同时使用。
resultType:返回的期望类型的类完全限定名或别名。
resultMap:外部resultMap的命名引用，可以通过自定义，映射更为复杂的情形。
association和collection都是resultMap元素的子元素。
association处理的是一对一的问题。
collection处理的是一对多的问题。
PreparedStatement是预编译，数据库对预编译的SQL会有缓存支持，多次执行，性能会比Statement好。
PreparedStatement的安全性会比Statement好，可以防止SQL注入问题。
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
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Typescript
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Django
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Laravel
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Microsoft
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Tencent
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