SpringBoot[第二篇]用JdbcTemplates訪問Mysql

工程依賴：

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<scope>runtime</scope>
</dependency>
	
<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.0.29</version>
</dependency>

具體的實現類：

@Repository
public class AccountDaoImpl implements IAccountDAO {

    @Autowired
    private JdbcTemplate jdbcTemplate;
    @Override
    public int add(Account account) {
        return jdbcTemplate.update("insert into account(name, money) values(?, ?)",
              account.getName(),account.getMoney());

    }

    @Override
    public int update(Account account) {
        return jdbcTemplate.update("UPDATE  account SET NAME=? ,money=? WHERE id=?",
                account.getName(),account.getMoney(),account.getId());
    }

    @Override
    public int delete(int id) {
        return jdbcTemplate.update("DELETE from TABLE account where id=?",id);
    }

    @Override
    public Account findAccountById(int id) {
        List<Account> list = jdbcTemplate.query("select * from account where id = ?", new Object[]{id}, new BeanPropertyRowMapperSelf(Account.class));
        if(list!=null && list.size()>0){
            Account account = list.get(0);
            return account;
        }else{
            return null;
        }
    }

    @Override
    public List<Account> findAccountList() {
        List<Account> list = jdbcTemplate.query("select * from account", new Object[]{}, new BeanPropertyRowMapper(Account.class));
        if(list!=null && list.size()>0){
            return list;
        }else{
            return null;
        }
    }
}

改寫BeanPropertyRowMapper：

@Target(ElementType.FIELD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface ColumnProperties {
	
	String value() default "";
}

BeanPropertyRowMapperSelf

protected void initialize(Class<T> mappedClass) {
		this.mappedClass = mappedClass;
		this.mappedFields = new HashMap<String, PropertyDescriptor>();
		this.mappedProperties = new HashSet<String>();
		PropertyDescriptor[] pds = BeanUtils.getPropertyDescriptors(mappedClass);
		//Field[] fields = mappedClass.getDeclaredFields();
		for (PropertyDescriptor pd : pds) {
			if (pd.getWriteMethod() != null) {
				this.mappedFields.put(lowerCaseName(pd.getName()), pd);
				String underscoredName = "";
				try {
					Field field = mappedClass.getDeclaredField(pd.getName());
					if(field.isAnnotationPresent(ColumnProperties.class)){
						underscoredName = field.getAnnotation(ColumnProperties.class).value().toLowerCase();
					}
				} catch (Exception e) {
					e.printStackTrace();
				}
				if(Strings.isNullOrEmpty(underscoredName)){
					underscoredName = underscoreName(pd.getName());//通過實體字段,映射成數據庫字段
				}
				if (!lowerCaseName(pd.getName()).equals(underscoredName)) {
					this.mappedFields.put(underscoredName, pd);
				}
				this.mappedProperties.add(pd.getName());
			}
		}
	}