Django中的动态逻辑查询构建器

本文介绍了Django中的动态逻辑查询构建器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我在数据库中有2个表:

I'm have 2 table in DB:

class Param(models.Model):
    s_name = models.CharField(max_length=200)
    n_name = models.CharField(max_length=200)

class ParamValue(models.Model):
    param = models.ForeignKey(Param)
    value = models.IntegerField()
    created = models.DateTimeField(default=datetime.now, blank=True)

我想创建动态构造函数.是否有用于创建动态逻辑过滤器的库或方法，例如Apache Lucene或Solr?我的意思是这样的:

I wanted to create dynamic constructor. Is there any library or method for create dynamic logic filter like as Apache Lucene or Solr?I mean something like this:

dyn_filter = parse("(value < 200 AND value__s_name == 'pressure') 
    OR (value > 10 AND value__s_name == 'depth')")
result = ParamValue.objects.filter(dyn_filer)

推荐答案

检查库 DjangoQL .它支持逻辑运算符，比较运算符，括号，表联接等.

Check the library DjangoQL. It supports logical operators, comparison operators, parenthesis, table joins, etc.

from django.db import models

from djangoql.queryset import DjangoQLQuerySet


class Book(models.Model):
    name = models.CharField(max_length=255)
    author = models.ForeignKey('auth.User')

    objects = DjangoQLQuerySet.as_manager()

在上面的示例中，您可以像这样执行搜索:

With the example above you can perform search like this:

qs = Book.objects.djangoql(
    'name ~ "war" and author.last_name = "Tolstoy"'
)

然后DjangoQL将执行等效的Django查询集.

And DjangoQL will execute the equivalent Django queryset.

这篇关于Django中的动态逻辑查询构建器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！