是否可以将搜索查询更新为仅显示过去 30 天内看到的设备？

Posted 2023-02-16

【中文标题】是否可以将搜索查询更新为仅显示过去 30 天内看到的设备？

【英文标题】：Would it be possible to update the search query to only display devices that have been seen within the last 30 days?

【发布时间】：2021-10-25 08:31:10

【问题描述】：

SELECT name as "Device Name",description as "Description",last_seen_at  as "Last Seen At",collector as "Collector",alias_name as "Alias Name",
model as "Model",device_types as "Device Types",ip_function_type as "IP Function Type",system_oid as "System OID",vendor as "Vendor",
host_name as "Host Name",primary_ip_address as "Primary IP Address",city as "City",state as "State",
collection_system as "Collection System",location as "Location",location_description as "Location Description",
std_device_name as "Standard Device Name",collector_alternate_id as "Collector Alternate Id",create_time as "Create Time",
device_model_id as "Device Model Id",location_id as "Location Id",display_name as "Display Name",
display_description as "Display Description",supported_protocols as "Supported Protocols",polled_item_count as "Polled Iten Count",
life_cycle_state as "Life Cycle State",life_cycle_state_last_chg_on as "Life Cycle State Last Change On",
contact_status as "Contact Status",calculated_contact_status as "Calculated Contact Status",last_updated_at as "Last Updated At",npm_status as "NPM Status",node_id as "Node Id"
FROM  NPM_DEVICES
WHERE  --device_id > 20000000 and 
(Lower(name) LIKE Lower('%$Search%') or Lower(description) LIKE Lower('%$Search%') or Lower(collector) LIKE Lower('%$Search%')
or Lower(alias_name) LIKE Lower('%$Search%') or Lower(model) LIKE Lower('%$Search%') or Lower(device_types) LIKE Lower('%$Search%')
or ip_function_type LIKE '%$Search%' or Lower(display_name) LIKE Lower('%$Search%') or
Lower(display_description) LIKE Lower('%$Search%') or Lower(system_oid) LIKE Lower('%$Search%') or
Lower(location) LIKE Lower('%$Search%') or Lower(location_description) LIKE Lower('%$Search%') or
Lower(vendor) LIKE Lower('%$Search%') or Lower(life_cycle_state) LIKE Lower('%$Search%') or
Lower(contact_status) LIKE Lower('%$Search%') or Lower(state) LIKE Lower('%$Search%') or
Lower(city) LIKE Lower('%$Search%') or Lower(std_device_name) LIKE Lower('%$Search%') or
collector_alternate_id LIKE '%$Search%' or primary_ip_address LIKE '%$Search%'
or  Lower(host_name) LIKE Lower('%$Search%'))
LIMIT $resultlimit;

以上查询需要获取最近 30 天内最后一次出现的设备

【问题讨论】：

能否格式化查询，使其可读？

【参考方案1】：

在 WHERE 子句中添加类似的内容：

AND CAST(last_updated_at AS DATE) BETWEEN DATEADD(DAY, -30, CAST(NOW() AS DATE)) AND NOW()

【讨论】：

感谢您的解决方案，但我们在 NPM_DEVICES 表中没有列日

在该示例中，DAY 是 SQL 函数 DATEADD 的一部分，用于指示间隔。只是PostgreSQL没有实现DATEADD，第一个答案显示了postgres中如何解决相同的要求。希望这会有所帮助。

【参考方案2】：

您可以使用 last_updated_at 列来获取最近 30 天的记录。

where last_updated_at BETWEEN (CURDATE() - INTERVAL 30 DAY) AND CURDATE()

【讨论】：

我们有一个 last_seen_at 列，因此我们可以使用它，因为获取在 30 天时已被看到的设备以及在使用此条件时“其中 last_updated_at BETWEEN (CURDATE() - INTERVAL 30 DAY) AND CURDATE( )" 得到 sytanx 错误作为 pq: 在 "30" 或附近出现语法错误