查询Azure DocumentDB中子集合的子集合

Question

我在Cosmos中有一个Azure DocumentDB json存储，我试图在集合中的集合上应用互斥的条件where子句。我期望查询的工作方式不会返回预期的结果！

假设我有一个产品类：

public class Product
{
    public int Id { get; set; }

    public string Name { get; set; }

    public IEnumerable<ProductAttribute> ProductAttributes { get; set; }
}

具有ProductAttributes的集合，而ProductAttributes又包含字符串集合：

  public class ProductAttribute
{
    public string Name { get; set; }

    public IEnumerable<string> AttributeValues { get; set; }
}

如果我创建2个示例产品并将它们添加到DocumentDB集合中：

    var product = new Product
                {
                    Id = 1,
                    Name = "Banana",
                    ProductAttributes = new List<ProductAttribute>
                    {
                        new ProductAttribute{Name = "SourceCountry",AttributeValues = new List<string>{ "COL", "HON", "SA" }},
                        new ProductAttribute{Name = "Colours",AttributeValues = new List<string>{ "Yellow" }},
                    }
                };

                var product1 = new Product
                {
                    Id = 2,
                    Name = "Grape",
                    ProductAttributes = new List<ProductAttribute>
                    {
                        new ProductAttribute{Name = "SourceCountry",AttributeValues = new List<string>{ "FRA", "ITA", "SA" }},
                        new ProductAttribute{Name = "Colours",AttributeValues = new List<string>{ "Red", "Green" }},
                    }
                };

文档存储为以下JSON：

{
"id": "1",
"name": "Banana",
"productAttributes": [
  {
    "name": "SourceCountry",
    "attributeValues": [
      "COL",
      "HON",
      "SA"
    ]
  },
  {
    "name": "Colours",
    "attributeValues": [
      "Yellow"
    ]
  }
]}

和

{
"id": "2",
"name": "Grape",
"productAttributes": [
  {
    "name": "SourceCountry",
    "attributeValues": [
      "FRA",
      "ITA",
      "SA"
    ]
  },
  {
    "name": "Colours",
    "attributeValues": [
      "Red",
      "Green"
    ]
  }
]}

我想查询产品只返回那些在两种类型的ProductAttribute中都具有符合条件的属性。

以下关于单个属性的查询按预期返回两个产品（Grape和Banana都包含一个SourceCountry＆＃39; SA＆＃39;：

select p.name, p.productAttributes from c as p
join pa in p.productAttributes
join pav in pa.attributeValues
where (pa.name='SourceCountry' and pav = 'SA')

但是，我需要能够在两种类型的属性中应用标准，即SourceCountry＆＃39;和＆＃39;颜色＆＃39; - 所以我尝试了以下查询：

select p.name, p.productAttributes from c as p
join pa in p.productAttributes
join pav in pa.attributeValues
where (pa.name='SourceCountry' and pav = 'SA')
and (pa.name='Colours' and pav = 'Red')

我期待着'Grape＆＃39;要从上述查询返回，因为此产品是唯一一个同时拥有＆＃39; SourceCountry＆＃39; ＆＃39; SA＆＃39;和一个颜色＆＃39; ＆＃39; Red＆＃39;。

的属性

然而，没有产品退回，我非常感谢有人可以解释为什么会这样！

Answer 1

在黑暗中完全拍摄，但这可能有效：

select p.name, p.productAttributes from c as p
join pa in p.productAttributes
join pav in pa.attributeValues    
join pa2 in p.productAttributes
join pav2 in pa2.attributeValues
where (pa.name='SourceCountry' and pav = 'SA')
and (pa2.name='Colours' and pav2 = 'Red')