在MongoDB中查詢找到“發貨”地址等於發貨地址的文件
若要檢查相等性並獲取文件,請使用MongoDB中的$where。我們使用文件建立一個集合−
> db.demo589.insertOne({deliveryAddress:"US",billingAddress:"UK"});{
"acknowledged" : true, "insertedId" : ObjectId("5e92c117fd2d90c177b5bccc")
}
> db.demo589.insertOne({deliveryAddress:"US",billingAddress:"US"});{
"acknowledged" : true, "insertedId" : ObjectId("5e92c11bfd2d90c177b5bccd")
}
> db.demo589.insertOne({deliveryAddress:"US",billingAddress:"AUS"});{
"acknowledged" : true, "insertedId" : ObjectId("5e92c11ffd2d90c177b5bcce")
}
> db.demo589.insertOne({deliveryAddress:"UK",billingAddress:"US"});{
"acknowledged" : true, "insertedId" : ObjectId("5e92c127fd2d90c177b5bccf")
}使用find()方法從集合中顯示所有文件−
> db.demo589.find();
這將產生以下輸出−
{ "_id" : ObjectId("5e92c117fd2d90c177b5bccc"), "deliveryAddress" : "US", "billingAddress" : "UK" }
{ "_id" : ObjectId("5e92c11bfd2d90c177b5bccd"), "deliveryAddress" : "US", "billingAddress" : "US" }
{ "_id" : ObjectId("5e92c11ffd2d90c177b5bcce"), "deliveryAddress" : "US", "billingAddress" : "AUS" }
{ "_id" : ObjectId("5e92c127fd2d90c177b5bccf"), "deliveryAddress" : "UK", "billingAddress" : "US" }以下是查詢“發貨”地址等於收貨地址並獲取文件的方法−
> db.demo589.find( { $where: "this.deliveryAddress == this.billingAddress" } );這將產生以下輸出−
{ "_id" : ObjectId("5e92c11bfd2d90c177b5bccd"), "deliveryAddress" : "US", "billingAddress" : "US" }
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