[转] spring JdbcTemplate 查询，使用BeanPropertyRowMapper

[From] http://blog.csdn.net/limenghua9112/article/details/45096437

应用：

使用Spring的JdbcTemplate查询数据库，获取List结果列表，数据库表字段和实体类自动对应，可以使用BeanPropertyRowMapper。

注意：

自动绑定，需要列名称和Java实体类名字一致，如：属性名 “userName” 可以匹配数据库中的列字段 "USERNAME" 或 “user_name”。这样，我们就不需要一个个手动绑定了，大大提高了开发效率。

org.springframework.jdbc.core.JdbcTemplate  的 query 方法：
org.springframework.jdbc.core.JdbcTemplate.query(String sql, Object[] args,RowMapper<UserEntity> rowMapper) throws DataAccessException
public class BeanPropertyRowMapper<T> implements RowMapper<T>    注：BeanPropertyRowMapper 实现了 RowMapper 接口

转载请注明：http://blog.csdn.net/limenghua9112/article/details/45096437

查询代码：

@Override
    public List<UserEntity> findUser(UserEntity user) {
        logger.info("查询语句：" + SEL_BY_USERNAME_PWD);

        /*
         * Query given SQL to create a prepared statement from SQL and a list of
         * arguments to bind to the query, mapping each row to a Java object via
         * a RowMapper.
         */
        /*
         * In Spring 2.5, comes with a handy RowMapper implementation(实现) called
         * ‘BeanPropertyRowMapper’, which can maps a row’s column value to a
         * property by matching their names. Just make sure both the property
         * and column has the same name, e.g property ‘custId’ will match to
         * column name ‘CUSTID’ or with underscores(底线) ‘CUST_ID’.
         */
        List<UserEntity> userList = jdbcTemplate.query(SEL_BY_USERNAME_PWD,
                new Object[] { user.getUserName(), user.getPwd() },
                new BeanPropertyRowMapper<UserEntity>(UserEntity.class));
        return userList;
    }

SQL：

private static final String SEL_BY_USERNAME_PWD = "SELECT * FROM " + ConstantList.T_SHUJU_ADMIN_USER + " AS sp WHERE sp.username = ? and sp.pwd = ?";