主页 / 问题 / 823303
Accepted
Vitaly M.
Asked:2020-05-04 22:56:15 +0000 UTC2020-05-04 22:56:15 +0000 UTC

jdbcTemplate.query(query, ROW_MAPPER) 创建空对象

  • 772

一个东西：

public class MissedCall {

    private Timestamp dateTime;
    private String callerId;    
    private Long duration;       

    public MissedCall(Timestamp dateTime, String callerId, long duration) {
        this.dateTime = dateTime
        this.callerId = callerId;
        this.duration = duration;
    }

执行请求的方法：

public class JdbcMissedCallRepositoryImpl implements JdbcMissedCallRepository {
    ...

    private static final RowMapper<MissedCall> ROW_MAPPER = BeanPropertyRowMapper.newInstance(MissedCall.class);
    ...
    public List<MissedCall> getForLastDays() {
    ...
    List<MissedCall> missedCalls = jdbcTemplate.query(query, ROW_MAPPER);
    ...
    }

结果，在列表中我得到一个空的 MissedCall 对象......

如果查询是手动执行的，那么结果是：

+---------------------+-------------+------+
| atm                 | asrc        | adur |
+---------------------+-------------+------+
| 2018-05-02 19:46:21 | 89181112233 |    4 |
+---------------------+-------------+------+
1 row in set (0.00 sec)

他需要什么来匹配这些字段？

java

1 个回答

  1. Best Answer

    明白了。谁在乎 - 对象字段的名称必须与查询输出中的列名称匹配。那些。结果应该是：

    +---------------------+-------------+----------+
| dateTime            | callerId    | duration |
+---------------------+-------------+----------+
| 2018-05-02 19:46:21 | 89181112233 |        4 |
+---------------------+-------------+----------+
1 row in set (0.00 sec)
    • 1

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