如何在具有多个组合字段的过滤器的集合中查找MongoDB文档？
您可以与此同时使用$or运算符find()。首先让我们创建一个包含文档的集合-
> db.findDocumentWithFilterDemo.insertOne({"ClientName":"Robert","IsMarried":false});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd4fd1e2cba06f46efe9ef1")
}
> db.findDocumentWithFilterDemo.insertOne({"ClientName":"Chris","IsMarried":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd4fd322cba06f46efe9ef2")
}
> db.findDocumentWithFilterDemo.insertOne({"ClientName":"David","IsMarried":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd4fd3b2cba06f46efe9ef3")
}
> db.findDocumentWithFilterDemo.insertOne({"ClientName":"Carol","IsMarried":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd4fd452cba06f46efe9ef4")
}以下是在find()方法的帮助下显示集合中所有文档的查询-
> db.findDocumentWithFilterDemo.find().pretty();
这将产生以下输出-
{
"_id" : ObjectId("5cd4fd1e2cba06f46efe9ef1"),
"ClientName" : "Robert",
"IsMarried" : false
}
{
"_id" : ObjectId("5cd4fd322cba06f46efe9ef2"),
"ClientName" : "Chris",
"IsMarried" : true
}
{
"_id" : ObjectId("5cd4fd3b2cba06f46efe9ef3"),
"ClientName" : "David",
"IsMarried" : true
}
{
"_id" : ObjectId("5cd4fd452cba06f46efe9ef4"),
"ClientName" : "Carol",
"IsMarried" : true
}以下是查询以在多个组合字段上具有过滤器的集合中查找文档-
> db.findDocumentWithFilterDemo.find({ $or: [ { "ClientName": { $ne:"Robert" } }, { "IsMarried": { $ne: false } } ] } );这将产生以下输出-
{ "_id" : ObjectId("5cd4fd322cba06f46efe9ef2"), "ClientName" : "Chris", "IsMarried" : true }
{ "_id" : ObjectId("5cd4fd3b2cba06f46efe9ef3"), "ClientName" : "David", "IsMarried" : true }
{ "_id" : ObjectId("5cd4fd452cba06f46efe9ef4"), "ClientName" : "Carol", "IsMarried" : true }