Question

我想从每周存储日期时间字段的表中获取记录。一个mysql查询，可以识别周数和周开始和结束日期。

如链接中所示。

https://www.epochconverter.com/weeks/2017

如何通过mysql查询获取该记录，包括周数，该周的开始和结束日期以及一周的开始和结束日期之间的记录。不适用于当前或单周。过去几周我需要它们来记录数据库表中可用的日期时间值。即

Week (number to know?) - Start date - end date.

Week 01 -   Start date - January 2, 2017 ---- End date --   January 8, 2017
|-> All records in it.
Week 02 -   Start date - January 9, 2017 ---- End date --   January 15, 2017
|-> All records in it.

Answer 1

让你的数据库中有main_table一些数据。例如：

CREATE TABLE `main_table` (
  `ID` int(11) NOT NULL AUTO_INCREMENT,
  `Date` date NOT NULL,
  `Description` varchar(45) DEFAULT NULL,
  PRIMARY KEY (`ID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT main_table 
    (`Date`, Description) 
VALUES 
    ('2017-01-02','The first record'),
    ('2017-01-05','The second record'),
    ('2017-01-11','The third record'),
    ('2017-01-17','The fourth record');

创建用户定义的函数，该函数返回与指定日期相同的特定日期的日期。使用CREATE FUNCTION语法：

DELIMITER $$
CREATE FUNCTION `GET_DAY_OF_WEEK` (`date`  DATE, `day` TINYINT UNSIGNED) 
RETURNS DATE
BEGIN
    RETURN `date`- INTERVAL WEEKDAY(`date`) + 1 DAY + INTERVAL `day` DAY;
END$$
DELIMITER ;

如果你的星期是星期一开始，那么星期一使用1，星期日使用7。如果你的星期是星期日开始，那么星期日使用0，星期六使用6。例如，我的星期是星期一开始的，我希望上周三的日期，然后

SELECT GET_DAY_OF_WEEK('2017-06-03', 3);

返回'2017-05-31' 因此，要每周获取main_table的记录，您可以使用以下MySQL查询：

SELECT 
    ID, 
    WEEKOFYEAR(`Date`) AS WeekNum,
    GET_DAY_OF_WEEK(`Date`, 1) AS WeekStarted,
    GET_DAY_OF_WEEK(`Date`, 7) AS WeekFinished,
    Description
FROM main_table;

查询结果将是

ID  WeekNum WeekStarted WeekFinished    Description
1   1       2017-01-02  2017-01-08      'The first record'
2   1       2017-01-02  2017-01-08      'The second record'
3   2       2017-01-09  2017-01-15      'The third record'
4   3       2017-01-16  2017-01-22      'The fourth record'

Answer 2

了解如何获取周here，然后在日期之间获取mysql数据，请使用以下语句：

$sql = "SELECT * FROM stock WHERE dateColumnName BETWEEN '{$startDate}' AND '{$endDate}'";

确保日期格式为＆＃39; Y-m-d＆＃39;。

更新：

以下是适用于我的完整代码：

<?php 
function getStartAndEndDate($week, $year) {
  $dto = new DateTime();
  $dto->setISODate($year, $week);
  $ret['week_start'] = $dto->format('Y-m-d');
  $dto->modify('+6 days');
  $ret['week_end'] = $dto->format('Y-m-d');
  return $ret;
} ?>
    <table>
        <tr>
            <th>Week Number</th>
            <th>From Date</th>
            <th>To Date</th>
        </tr>
<?php 
for($i=1; $i<=52; $i++){
    $week_array = getStartAndEndDate($i,2017);
    $sql = "SELECT * FROM stock WHERE on_date BETWEEN '{$week_array['week_start']}' AND '{$week_array['week_end']}'";
    $result = mysqli_query($con,$sql);
    $item = mysqli_fetch_assoc($result);
    echo "<tr>
            <td>Week $i </td>
            <td>".$week_array['week_start']."</td>
            <td>".$week_array['week_end']."</td>
            <td>".$item['id']."</td>
        </tr>"; 
} ?>

</table>

每周日历记录

2 个答案: