Spring之jdbctemplate

一个持久层接口

public interface IAccountDao {

    /**
     * 根据Id查询账户
     * @param accountId
     * @return
     */
    Account findAccountById(Integer accountId);

    /**
     * 根据名称查询账户
     * @param accountName
     * @return
     */
    Account findAccountByName(String accountName);

    /**
     * 更新账户
     * @param account
     */
    void updateAccount(Account account);
}


一个持久层实现类

public class AccountDaoImpl extends JdbcDaoSupport implements IAccountDao {

    @Override
    public Account findAccountById(Integer accountId) {
        List<Account> accounts = super.getJdbcTemplate().query("select * from account where id = ?",new BeanPropertyRowMapper<Account>(Account.class),accountId);
        return accounts.isEmpty()?null:accounts.get(0);
    }

    @Override
    public Account findAccountByName(String accountName) {
        List<Account> accounts = super.getJdbcTemplate().query("select * from account where name = ?",new BeanPropertyRowMapper<Account>(Account.class),accountName);
        if(accounts.isEmpty()){
            return null;
        }
        if(accounts.size()>1){
            throw new RuntimeException("结果集不唯一");
        }
        return accounts.get(0);
    }

    @Override
    public void updateAccount(Account account) {
        super.getJdbcTemplate().update("update account set name=?,money=? where id=?",account.getName(),account.getMoney(),account.getId());
    }
}

此时使用bean.xml 配置IOC和jdbctemplate

    <!-- 配置账户的持久层-->
    <bean id="accountDao" class="com.itheima.dao.impl.AccountDaoImpl">
        <!--<property name="jdbcTemplate" ref="jdbcTemplate"></property>-->
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--配置JdbcTemplate-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 配置数据源-->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/eesy"></property>
        <property name="username" value="root"></property>
        <property name="password" value="1234"></property>
    </bean>
</beans>


根据xml获取容器得到JDBCTemplate

public class JdbcTemplateDemo2 {

    public static void main(String[] args) {
        //1.获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //2.获取对象
        JdbcTemplate jt = ac.getBean("jdbcTemplate",JdbcTemplate.class);
        //3.执行操作
        jt.execute("insert into account(name,money)values('ddd',2222)");

}

sql语句多种形式

        jt.update("insert into account(name,money)values(?,?)","eee",3333f);
//        更新
        jt.update("update account set name=?,money=? where id=?","test",4567,7);
//        删除
        jt.update("delete from account where id=?",8);

List<Account> accounts = jt.query("select * from account where money > ?",new BeanPropertyRowMapper<Account>(Account.class),1000f);
返回Account类型的List 通过

new BeanPropertyRowMapper<Account>(Account.class) 设置返回类型

Long count = jt.queryForObject("select count(*) from account where money > ?",Long.class,1000f);


实现类开启注解配置

@Repository
public class AccountDaoImpl2 implements IAccountDao {

    @Autowired
    private JdbcTemplate jdbcTemplate;

@Override
public Account findAccountById(Integer accountId) {
    List<Account> accounts = jdbcTemplate.query("select * from account where id = ?",new BeanPropertyRowMapper<Account>(Account.class),accountId);
    return accounts.isEmpty()?null:accounts.get(0);
}
}

 */
public class JdbcTemplateDemo4 {

    public static void main(String[] args) {
        //1.获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //2.获取对象
        IAccountDao accountDao = ac.getBean("accountDao",IAccountDao.class);

        Account account = accountDao.findAccountById(1);
        System.out.println(account);

        account.setMoney(30000f);
        accountDao.updateAccount(account);
    }
}
成功运行