@Autowired(required = false)
required false Autowired
2023-09-11 14:18:04 时间
标记在 方法上的时候,它会根据类型去spring容器中寻找 对于的形参并且注入。
1 @Repository(value="userDao") 2 public class UserDaoImpl extends SqlSessionDaoSupport implements IUserDao{ 3 4 // @Autowired 5 // @Qualifier(value="sqlsessionFactory11") 6 // private SqlSessionFactory asqlSessionFactory; 7 // 8 public User getOne(String uid) { 9 return this.getSqlSession().selectOne("cn.us.mybatis.getOne",uid); 10 } 11 12 public List<User> getAllUsers() { 13 Object obj=this.getSqlSession(); 14 return this.getSqlSession().selectList("cn.us.mybatis.getAllUsers"); 15 } 16 17 }
子类也可以,如果配置多个就会报错。
SqlSessionDaoSupport 中有以下方法
1 @Autowired(required = false) 2 public final void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory) { 3 if (!this.externalSqlSession) { 4 this.sqlSession = new SqlSessionTemplate(sqlSessionFactory); 5 } 6 }
只能一个bean,根据 type 类型去匹配的
1 <bean id="sqlsessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" > 2 <property name="configLocation" value="classpath:sqlMapConfig.xml"></property> 3 <property name="dataSource" ref="dataSource"></property> 4 </bean>
因为 required=false,如果spring找不到的话会赋空值进去
如果没有@Autowired(required = false)的话,那么UserDaoImpl 不能继承
SqlSessionDaoSupport 了,可以用组合的方式
然后
@Autowired
private SqlSessionFactory sqlSessionFactory;
然后在spring配置文件中,<bean id=...>配置上 SqlSessionFactory
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