如何显示从月底开始到月初结束的休假信息？

Question

我有一个表格，用户可以在其中查看已批准的休假次数。但是问题开始于用户申请休假时，选择了从月底开始到月初结束的日期。

这是查询

SELECT l.applicationID
     , l.empID
     , e.name
     , l.typeID
     , t.title
     , t.allowed_leave
     , l.start_date
     , l.end_date
     , l.comment
     , l.status 
  FROM leave_application l 
  JOIN employee e
    ON e.empID = l.empID 
  JOIN leave_type t
    ON t.typeID = l.typeID 
 where l.empID = $employee_id 
   AND status = 'approved' 
   AND start_date LIKE '$start_date%'

现在，当用户尝试选择列表中显示的起始月份但当他选择结束日期时，由于未定义结束日期查询，因此未显示该日期。

Answer 1

首先你应该避免在你的 SQL 字符串上连接并使用准备好的语句来防止 SQL 注入。然后就可以像这样用SQL日期函数测试年月了；

// getting the input from the request
$inputDate = filter_input(INPUT_POST, 'startDate');
// splitting the string into an array
$dateParts = explode('-', $inputDate);

$sql = 'SELECT .. FROM yourtable WHERE some tests'

// adding the variable part of the query where clause
// the question marks will be replaced by true values 
// when you will execute the query
if (count($dateParts) >= 2){
  $sql .= ' AND YEAR(startDate)=? AND MONTH(startDate)= ?'
} 
if (count($dateParts) == 3){
  $sql .= ' AND DAY(startDate)=?'
}

// Preparing and executing the query
$dbConnection = new PDO(...);
$statement = $dbConnection->prepare($sql);
// executing the query passing the values as an array
$statement->execute($dateParts);

希望对大家有帮助