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法律研究使用 OR 條件在 MongoDB 查詢中獲取多個文件？
讓我們建立一個有文件的集合 -
> db.demo362.insertOne({"ClientName":"John","ClientProject":"School Management System"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e56a77454a481fef8ec7a1c")
}
> db.demo362.insertOne({"ClientName":"David","ClientProject":"Library Management System"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e56a78454a481fef8ec7a1d")
}
> db.demo362.insertOne({"ClientName":"Mike","ClientProject":"Event Tracker"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e56a7a054a481fef8ec7a1e")
}
> db.demo362.insertOne({"ClientName":"Carol","ClientProject":"Hospital Management System"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5e56a7b754a481fef8ec7a1f")
}在 find() 方法的幫助下，從集合中顯示所有文件 -
> db.demo362.find();
這將產生以下輸出 -
{ "_id" : ObjectId("5e56a77454a481fef8ec7a1c"), "ClientName" : "John", "ClientProject" : "School Management System" }
{ "_id" : ObjectId("5e56a78454a481fef8ec7a1d"), "ClientName" : "David", "ClientProject" : "Library Management System" }
{ "_id" : ObjectId("5e56a7a054a481fef8ec7a1e"), "ClientName" : "Mike", "ClientProject" : "Event Tracker" }
{ "_id" : ObjectId("5e56a7b754a481fef8ec7a1f"), "ClientName" : "Carol", "ClientProject" : "Hospital Management System" }以下是獲取多個文件的查詢 -
> db.demo362.find({$or: [{"ClientName":"John"}, {"ClientProject": "Event Tracker" }]});這將產生以下輸出 -
{ "_id" : ObjectId("5e56a77454a481fef8ec7a1c"), "ClientName" : "John", "ClientProject" : "School Management System" }
{ "_id" : ObjectId("5e56a7a054a481fef8ec7a1e"), "ClientName" : "Mike", "ClientProject" : "Event Tracker" }
更新於：02-04-2020
114 次瀏覽
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