MyBatis源码基础-常用类-Configuration

Configuration类

a.java配置

针对上述的xml配置，可以使用如下的java代码替换：

@Test
public void testConfiguration() {
    Configuration configuration = new Configuration();

    // 配置properties
    Properties properties = new Properties();
    properties.put("driver", "com.mysql.cj.jdbc.Driver");
    properties.put("url", "jdbc:mysql://localhost:3306/dcyMybatis");
    properties.put("username", "root");
    properties.put("password", "root");
    configuration.setVariables(properties);
    // 配置日志处理器
    configuration.setLogImpl(Slf4jImpl.class);

    // 配置驼峰命名
    configuration.setUseActualParamName(true);

    // 配置别名注册器注册一个包
    configuration.getTypeAliasRegistry().registerAliases("com.dcy.entity");

    // 配置Environments的 id、事务工厂、数据源
    JdbcTransactionFactory jdbcTransactionFactory = new JdbcTransactionFactory();
    PooledDataSource pooledDataSource = new PooledDataSource();
    pooledDataSource.setDriver(configuration.getVariables().getProperty("driver"));
    pooledDataSource.setUrl(configuration.getVariables().getProperty("url"));
    pooledDataSource.setUsername(configuration.getVariables().getProperty("username"));
    pooledDataSource.setPassword(configuration.getVariables().getProperty("password"));
    Environment environment = new Environment("development", jdbcTransactionFactory, pooledDataSource);
    configuration.setEnvironment(environment);

    // 配置Mapper
    StaticSqlSource staticSqlSource = new StaticSqlSource(configuration,"insert into account (username,money) values ('Cat', 291)");
    MappedStatement mappedStatement = new MappedStatement.Builder(
        configuration,
        "dcy.insert",
        staticSqlSource,
        SqlCommandType.INSERT
    ).build();
    configuration.addMappedStatement(mappedStatement);

}
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所有的mybatis.xml的配置项都可以使用Configuration类的形式进行配置

b.构建配置类

一个包装了XPathParser的工具类XMLConfigBuilder，可以将xml的配置文件解析成为一个配置类Configuration，代码如下：

@Test
public void tesXMLConfigBuilder() throws IOException {
    InputStream inputStream = new ClassPathResource("mybatis.xml").getInputStream();
    XMLConfigBuilder xmlConfigBuilder = new XMLConfigBuilder(inputStream);
    Configuration configuration = xmlConfigBuilder.parse();
    log.info("Configuration -> {}", configuration);
}
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