XML 中关于 dataSource 数据源信息配置

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在上一章节我们解析 XML 中的 SQL 配置信息,并在代理对象调用 DefaultSqlSession 中进行获取和打印操作,从整个框架结构来看我们解决了对象的代理、Mapper的映射、SQL的初步解析,那么接下来就应该是连库和执行SQL语句并返回结果了。

那么这部分内容就会涉及到解析 XML 中关于 dataSource 数据源信息配置,并建立事务管理和连接池的启动和使用。并将这部分能力在 DefaultSqlSession 执行 SQL 语句时进行调用。但为了不至于在一个章节把整个工程撑大,这里我们会把重点放到解析配置、建立事务框架和引入 DRUID 连接池,以及初步完成 SQL 的执行和结果简单包装上。便于读者先熟悉整个框架结构,在后续章节再陆续迭代和完善框架细节。
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