spring3-annotation-JdbcDaoSupport

问题:

Use annotation in dao

@Repository("testDao")
public class TestDaoImpl extends JdbcDaoSupport implements BaseDao{

@Override
public Object addObject(String sqlid, Object obj) {
    // TODO Auto-generated method stub
    return null;
}

Caused by: java.lang.IllegalArgumentException: 'dataSource' or 'jdbcTemplate' is required

I do not want to use ：

<bean id="termsDao" class="com.manage.base.dao.impl.TestDaoImpl">
    <property name="jdbcTemplate" ref="jdbcTemplate"/>
</bean>

this code set in xml， and “jdbcTemplate” has been defined in other “spring-xml”。

How to solve this problem by an annotation ：“'dataSource' or 'jdbcTemplate' is required”

回答1:

You can use one of the below approaches. The first one - taking a dataSource is preferred / recommended as you don't expose a SpringFramework class in your public interface. Both will work.

@Repository("testDao")
public class TestDaoImpl extends JdbcDaoSupport implements BaseDao{

  @Autowired
  TestDaoImpl(DataSource dataSource) {
    setDataSource(dataSource);
  }
}

Or

@Repository("testDao")
public class TestDaoImpl extends JdbcDaoSupport implements BaseDao{

  @Autowired
  TestDaoImpl(JDBCTemplate template) {
    setJdbcTemplate(template);
  }
}

回答2:

I even feel injecting datasource as a constructor to your DAO is a unnecessary coding step. Why not inject datasource in Spring config XML into JDBC template and just get jdbctTemplate object in every DAO.

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource"/>
</bean>
and let your DAO extend JDBCSupport class.

---

public class PersonDao extends JdbcDaoSupport{
public List<Person> selectAll(){
    String selectAllSql = "SELECT * FROM PERSON;";

    return getJdbcTemplate().query(selectAllSql, new PersonRowMapper());

........ }

}

Full example : http://www.studytrails.com/frameworks/spring/spring-jdbc-dao-support.jsp