自定义ORM(mybatis)源码(三)-创建SqlSession

模仿mybatis

SqlSession

@Slf4j
public class SqlSession {@Getterprivate Configuration configuration;private Connection connection;public SqlSession(Configuration configuration) {this.configuration = configuration;}public <T> T getMapper(Class<T> clz) {return configuration.getMapper(clz, this);}/*** 获取数据库连接** @return*/public Connection getConnection() {try {this.connection = configuration.getDataSourceFactory().getConnection();return this.connection;} catch (SQLException e) {log.info("could not getConnection from sqlSession");throw new RuntimeException(e);}}public void close() {if (this.connection != null) {try {connection.close();} catch (SQLException e) {log.info("sqlsession close error", e);}}}
}

SqlSessionFactory

public class SqlSessionFactory {private Configuration configuration;public SqlSessionFactory(Configuration configuration) {this.configuration = configuration;}public SqlSession openSession() {return new SqlSession(configuration);}
}

SqlSessionFactoryBuilder

创建 SqlSessionFactory

public class SqlSessionFactoryBuilder {private InputStream inputStream;public SqlSessionFactoryBuilder(InputStream inputStream) {this.inputStream  = inputStream;}public SqlSessionFactory build() {XmlConfigParser xmlConfigParser = new XmlConfigParser(new Configuration(), this.inputStream);return new SqlSessionFactory(xmlConfigParser.parse());}
}