[英]MySQL - querying a database for date ranges
I have an inventory system for adding items that can be hired out. 我有一个库存系统,用于添加可以租用的物品。 I am trying to run a MySQL query to see if an item is already out for hire, before adding the new hire to the system. 我正在尝试运行一个MySQL查询,以查看是否有新项目可供出租,然后再将新员工添加到系统中。 I am having to join 2 tables to do this; 我必须加入2个表才能做到这一点; hire and hire_items. 雇用和hire_items。
hire contains the following fields: hire_id, account_id, hire_start_date, hire_end_date, hire_return_date, total_hire_cost, notes and booking date
. hire包含以下字段: hire_id, account_id, hire_start_date, hire_end_date, hire_return_date, total_hire_cost, notes and booking date
。
hire_items contains the following fields: hire_item_id, hire_id, item_id and item_hire_cost
. hire_items包含以下字段: hire_item_id, hire_id, item_id and item_hire_cost
。
I have already tried the following query, which doesn't error, but does allow me to add a hire where items are already hired out: 我已经尝试了以下查询,该查询没有错误,但确实允许我添加一个已经雇用了人员的雇用人员:
SELECT i.item_id
FROM hire_items AS i
INNER JOIN hire AS h ON i.hire_id = h.hire_id
WHERE ((item_id = $selected_item_id) AND ($hsd >= h.hire_start_date AND $hsd <= h.hire_return_date)) OR ((item_id = $selected_item_id) AND ($hed >= h.hire_start_date AND $hed <= h.hire_return_date)) OR ((item_id = $selected_item_id) AND ($hrd >= h.hire_start_date AND $hrd <= h.hire_return_date))
$hsd
is the hire start date (from an input) $hsd
是雇用开始日期(来自输入)
$hed
is the hire end date (from an input) $hed
是雇用结束日期(来自输入)
$hrd
is the hire return date (from an input) $hrd
是录用返回日期(来自输入)
SELECT i.item_id
FROM hire_items AS i
INNER JOIN hire AS h ON i.hire_id = h.hire_id
WHERE (item_id = $selected_item_id)
AND ($hsd NOT BETWEEN h.hire_start_date AND h.hire_return_date)
AND ($hrd NOT BETWEEN h.hire_start_date AND h.hire_return_date)
AND (h.hire_start_date NOT BETWEEN CAST($hsd AS DATE) AND CAST($hrd AS DATE))
This queries for 这查询
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