Django中Modual資料查詢操作

本文以乙個影視資料庫為資料來源

模型類：

作為演示sql,定義乙個輸出sql語句的方法

def showsql():

from django.db import connection

queries = connection.queries

print(queries[-1]['sql'])

方法演示（第一條為django語句，第二條為對應sql語言）：

movie.objects.get(mid=150) #查詢乙個，返回值：物件，查詢不到出 .doesnotexist 錯。

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where `movie`.`mid` = 150

movie.objects.first() #查詢第乙個,返回值：物件

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` order by `movie`.`mid` asc limit 1

movie.objects.last() #查詢最後乙個，返回值：物件

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` order by `movie`.`mid` desc limit 1

movie.objects.count() #查詢總條數，返回值：int

select count(*) as `__count` from `movie`

movie.objects.all() #查詢所有，但預設只取前21條，返回值：queryset ##懶載入

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` limit 21

movie.objects.all()[20:25] #查詢20到25條（切片）

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` limit 5 offset 20

movie.objects.filter(mname='王牌保鏢') #條件查詢，與get不同是的，它返回的是queryset集合，查詢不到不報錯

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where `movie`.`mname` = '王牌保鏢' limit 21

模糊查詢（%、_、like）：

movie.objects.filter(mname__endswith='保鏢') #以什麼為結尾

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where `movie`.`mname` like binary '%保鏢' limit 21

movie.objects.filter(mname__startswith='保鏢') #以什麼開頭

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where `movie`.`mname` like binary '保鏢%' limit 21

movie.objects.filter(mname__contains='保鏢') #包含什麼

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where `movie`.`mname` like binary '%保鏢%' limit 21

movie.objects.filter(mname__exact='保鏢') #相等於什麼

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where `movie`.`mname` = '保鏢' limit 21

movie.objects.filter(mname__istartswith='m') #忽略大小寫

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where `movie`.`mname` like 'm%' limit 21

movie.objects.filter(mname__isnull=true) #判斷該欄位是否為空

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where `movie`.`mname` is null limit 21

movie.objects.filter(mname__contains='保鏢',mid=161) #多條件查詢，後面逗號接語句

movie.objects.filter(mname__contains='保鏢').filter(mid=161) #功能與上面相同

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where (`movie`.`mid` = 161 and `movie`.`mname` like binary '%保鏢%') limit 21

movie.objects.values('mname','mid').filter(mname__contains='保鏢') #欄位名部分顯示

select `movie`.`mname`, `movie`.`mid` from `movie` where `movie`.`mname` like binary '%保鏢%' limit 21

movie.objects.filter(mname__contains='保鏢').exclude(mname__startswith='愛情') #不等於什麼

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where (`movie`.`mname` like binary '%保鏢%' and not (`movie`.`mname` like binary '愛情%')) limit 21

movie.objects.filter(mname__contains='保鏢').order_by('mid') #排序，預設為公升序，在mid前加個"-"號則為降序，如：.order_by('-mid')

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where `movie`.`mname` like binary '%保鏢%' order by `movie`.`mid` asc limit 21

注意：mname__contains、mname__istartswith

都是欄位名加雙下劃線來查詢。同也可以運用其它的方式來查詢如：gt、lt、et等等，如

movie.objects.filter(mid__gt=500).order_by('-mid') #查詢mid大於等於500的資料

select `movie`.`mid`, `movie`.`mname`, `movie`.`mdesc`, `movie`.`mimg`, `movie`.`mlink` from `movie` where `movie`.`mid` > 500 order by `movie`.`mid` desc limit 21

Django中Modual資料查詢操作

Django中資料儲存，資料加密功能

Django中資料庫配置

Django中資料庫的配置

Django中Modual資料查詢操作

Django中資料儲存，資料加密功能

Django中資料庫配置

Django中資料庫的配置

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