## org.springframework.dao.support
Class DaoSupport

    java.lang.Object
      org.springframework.dao.support.DaoSupport

All Implemented Interfaces:
  InitializingBean

Direct Known Subclasses:
  CciDaoSupport, HibernateDaoSupport, JdbcDaoSupport, JdoDaoSupport, JpaDaoSupport, SqlMapClientDaoSupport, TopLinkDaoSupport

    public abstract class DaoSupport

extends Object
implements InitializingBean

Generic base class for DAOs, defining template methods for DAO initialization.

Extended by Spring's specific DAO support classes, such as: JdbcDaoSupport, JdoDaoSupport, etc.

Since:
  1.2.2
Author:
  Juergen Hoeller
See Also:
  `JdbcDaoSupport`, `JdoDaoSupport`

Field Summary
`protected Log` `logger` Logger available to subclasses

Constructor Summary
`DaoSupport()`

Method Summary
`void` `afterPropertiesSet()` Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
`protected abstract void` `checkDaoConfig()` Abstract subclasses must override this to check their configuration.
`protected void` `initDao()` Concrete subclasses can override this for custom initialization behavior.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### logger

    protected final Log logger

  Logger available to subclasses

Constructor Detail

### DaoSupport

    public DaoSupport()

Method Detail

### afterPropertiesSet

    public final void afterPropertiesSet()
                                  throws IllegalArgumentException,
                                         BeanInitializationException

  Description copied from interface: `InitializingBean`
  Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

  This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

  Specified by:
    `afterPropertiesSet` in interface `InitializingBean`
  Throws:
    `IllegalArgumentException`
    `BeanInitializationException`

### checkDaoConfig

    protected abstract void checkDaoConfig()
                                    throws IllegalArgumentException

  Abstract subclasses must override this to check their configuration.

  Implementors should be marked as `final`

  Throws:
    `IllegalArgumentException` - in case of illegal configuration

### initDao

    protected void initDao()
                    throws Exception

  Concrete subclasses can override this for custom initialization behavior. Gets called after population of this instance's bean properties.

  Throws:
    `Exception` - if DAO initialization fails (will be rethrown as a BeanInitializationException)
  See Also:
    `BeanInitializationException`

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