mybatis之SqlSessionFactory源码分析
SqlSessionFactoryBuilder 类中代码
public class SqlSessionFactoryBuilder { public SqlSessionFactory build(Reader reader) { return build(reader, null, null); } public SqlSessionFactory build(Reader reader, String environment) { return build(reader, environment, null); } public SqlSessionFactory build(Reader reader, Properties properties) { return build(reader, null, properties); } public SqlSessionFactory build(Reader reader, String environment, Properties properties) { try { XMLConfigBuilder parser = new XMLConfigBuilder(reader, environment, properties); return build(parser.parse()); } catch (Exception e) { throw ExceptionFactory.wrapException("Error building SqlSession.", e); } finally { ErrorContext.instance().reset(); try { reader.close(); } catch (IOException e) { // Intentionally ignore. Prefer previous error. } } } public SqlSessionFactory build(InputStream inputStream) { return build(inputStream, null, null); } public SqlSessionFactory build(InputStream inputStream, String environment) { return build(inputStream, environment, null); } public SqlSessionFactory build(InputStream inputStream, Properties properties) { return build(inputStream, null, properties); } public SqlSessionFactory build(InputStream inputStream, String environment, Properties properties) { try { XMLConfigBuilder parser = new XMLConfigBuilder(inputStream, environment, properties); return build(parser.parse()); } catch (Exception e) { throw ExceptionFactory.wrapException("Error building SqlSession.", e); } finally { ErrorContext.instance().reset(); try { inputStream.close(); } catch (IOException e) { // Intentionally ignore. Prefer previous error. } } } public SqlSessionFactory build(Configuration config) { return new DefaultSqlSessionFactory(config);//DefaultSqlSessionFactory实现了SqlSessionFactory接口 } }
可以看到SqlSessionFactoryBuilder 中有9个build方法,其中有4个字符流、4个字节流,还有一个是(Configuration config)作为形参
都是将mybatis-config.xml配置文件解析成Configuration对象,最终导向build(Configuration configuration)进行SqlSessionFactory的构造。
然后可以看XMLConfigBuilder的parse()的方法是从configuration根节点开始解析,根节点下可以配置10个子节点
分别为:properties、typeAliases、plugins、objectFactory、objectWrapperFactory、settings、environments、databaseIdProvider、typeHandlers、mappers。