测试3

 1 public class SqlSessionFactoryBuilder {
 2 
 3   //Reader读取mybatis配置文件，传入构造方法
 4   //除了Reader外，其实还有对应的inputStream作为参数的构造方法，
 5   //这也体现了mybatis配置的灵活性
 6   public SqlSessionFactory build(Reader reader) {
 7     return build(reader, null, null);
 8   }
 9 
10   public SqlSessionFactory build(Reader reader, String environment) {
11     return build(reader, environment, null);
12   }
13   
14   //mybatis配置文件 + properties, 此时mybatis配置文件中可以不配置properties，也能使用${}形式
15   public SqlSessionFactory build(Reader reader, Properties properties) {
16     return build(reader, null, properties);
17   }
18   
19   //通过XMLConfigBuilder解析mybatis配置，然后创建SqlSessionFactory对象
20   public SqlSessionFactory build(Reader reader, String environment, Properties properties) {
21     try {
22       XMLConfigBuilder parser = new XMLConfigBuilder(reader, environment, properties);
23       //下面看看这个方法的源码
24       return build(parser.parse());
25     } catch (Exception e) {
26       throw ExceptionFactory.wrapException("Error building SqlSession.", e);
27     } finally {
28       ErrorContext.instance().reset();
29       try {
30         reader.close();
31       } catch (IOException e) {
32         // Intentionally ignore. Prefer previous error.
33       }
34     }
35   }
36 
37   public SqlSessionFactory build(Configuration config) {
38     return new DefaultSqlSessionFactory(config);
39   }
40 
41 }

 1 public class SqlSessionFactoryBuilder {
 2 
 3   //Reader读取mybatis配置文件，传入构造方法
 4   //除了Reader外，其实还有对应的inputStream作为参数的构造方法，
 5   //这也体现了mybatis配置的灵活性
 6   public SqlSessionFactory build(Reader reader) {
 7     return build(reader, null, null);
 8   }
 9 
10   public SqlSessionFactory build(Reader reader, String environment) {
11     return build(reader, environment, null);
12   }
13   
14   //mybatis配置文件 + properties, 此时mybatis配置文件中可以不配置properties，也能使用${}形式
15   public SqlSessionFactory build(Reader reader, Properties properties) {
16     return build(reader, null, properties);
17   }
18   
19   //通过XMLConfigBuilder解析mybatis配置，然后创建SqlSessionFactory对象
20   public SqlSessionFactory build(Reader reader, String environment, Properties properties) {
21     try {
22       XMLConfigBuilder parser = new XMLConfigBuilder(reader, environment, properties);
23       //下面看看这个方法的源码
24       return build(parser.parse());
25     } catch (Exception e) {
26       throw ExceptionFactory.wrapException("Error building SqlSession.", e);
27     } finally {
28       ErrorContext.instance().reset();
29       try {
30         reader.close();
31       } catch (IOException e) {
32         // Intentionally ignore. Prefer previous error.
33       }
34     }
35   }
36 
37   public SqlSessionFactory build(Configuration config) {
38     return new DefaultSqlSessionFactory(config);
39   }
40 
41 }