MyBatis之UnpooledDataSource

最新推荐文章于 2025-05-18 22:24:30 发布

天明少侠

最新推荐文章于 2025-05-18 22:24:30 发布

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分类专栏： mybatis-3.4.6 MyBatis源码解析文章标签： UnpooledDataSource MyBatis 源码

本文链接：https://blog.youkuaiyun.com/thebigdipperbdx/article/details/82953095

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本文详细介绍了MyBatis框架中的数据源种类，包括JNDI、POOLED和UNPOOLED，并深入探讨了其源码实现，特别是静态代码块在JVM加载类时的执行过程以及成员方法的具体功能。

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MyBatis官方文档

MyBatis官方文档
ORM框架

MyBatis数据源种类

JNDI
POOLED
UNPOOLED

源码

静态代码块

JVM加载类时会执行这些静态的代码块

static {
  // Enumeration的遍历
  Enumeration<Driver> drivers = DriverManager.getDrivers();
  while (drivers.hasMoreElements()) {
    Driver driver = drivers.nextElement();
    registeredDrivers.put(driver.getClass().getName(), driver);
  }
}

成员方法

private Connection doGetConnection(String username, String password) throws SQLException {
  Properties props = new Properties();
  if (driverProperties != null) {
    props.putAll(driverProperties);
  }
  if (username != null) {
    props.setProperty("user", username);
  }
  if (password != null) {
    props.setProperty("password", password);
  }
  return doGetConnection(props);
}

private synchronized void initializeDriver() throws SQLException {
  if (!registeredDrivers.containsKey(driver)) {
    Class<?> driverType;
    try {
      if (driverClassLoader != null) {
        driverType = Class.forName(driver, true, driverClassLoader);
      } else {
        driverType = Resources.classForName(driver);
      }
      // DriverManager requires the driver to be loaded via the system ClassLoader.
      // http://www.kfu.com/~nsayer/Java/dyn-jdbc.html
      Driver driverInstance = (Driver)driverType.newInstance();
      DriverManager.registerDriver(new DriverProxy(driverInstance));
      registeredDrivers.put(driver, driverInstance);
    } catch (Exception e) {
      throw new SQLException("Error setting driver on UnpooledDataSource. Cause: " + e);
    }
  }
}