在MongoDB集合中查找字段等于给定整数值的文档？
find()。让我们创建一个包含文档的集合-> db.demo472.insertOne({"Project_Id":-101,"ProjectName":"Online Customer Tracking"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e80586cb0f3fa88e227907a")
}
> db.demo472.insertOne({"Project_Id":101,"ProjectName":"Online Banking System"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e805884b0f3fa88e227907b")
}
> db.demo472.insertOne({"Project_Id":102,"ProjectName":"Online Library System"});{
"acknowledged" : true,
"insertedId" : ObjectId("5e805893b0f3fa88e227907c")
}在find()方法的帮助下显示集合中的所有文档-
> db.demo472.find();
这将产生以下输出-
{ "_id" : ObjectId("5e80586cb0f3fa88e227907a"), "Project_Id" : -101, "ProjectName" : "Online
Customer Tracking" }
{ "_id" : ObjectId("5e805884b0f3fa88e227907b"), "Project_Id" : 101, "ProjectName" : "Online
Banking System" }
{ "_id" : ObjectId("5e805893b0f3fa88e227907c"), "Project_Id" : 102, "ProjectName" : "Online
Library System" }以下是在MongoDB集合中查找文档的查询，其中字段等于给定的整数值-
> db.getCollection('demo472').find({"Project_Id":-101});这将产生以下输出-
{ "_id" : ObjectId("5e80586cb0f3fa88e227907a"), "Project_Id" : -101, "ProjectName" : "Online
Customer Tracking" }