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法律研究MongoDB 查詢布林欄位為 “not true”
對於這一點， يمكنك使用 $ne（不等於）運算子。語法如下所示 −
db.yourCollectionName.find({yourFieldName: {$ne: true}}).pretty();為了理解上述語法，讓我們建立一個包含文件的集合。用於建立包含文件的集合的查詢如下所示 −
> db.queryForBooleanFieldsDemo.insertOne({"EmployeeName":"Larry","EmployeeAge":24,"isOldEmployee":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8b7f7680f10143d8431e13")
}
> db.queryForBooleanFieldsDemo.insertOne({"EmployeeName":"Mike","EmployeeAge":20,"isOldEmployee":false});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8b7f8680f10143d8431e14")
}
> db.queryForBooleanFieldsDemo.insertOne({"EmployeeName":"Sam","EmployeeAge":23,"isOldEmployee":false});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8b7f9380f10143d8431e15")
}
> db.queryForBooleanFieldsDemo.insertOne({"EmployeeName":"David","EmployeeAge":25,"isOldEmployee":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8b7fa280f10143d8431e16")
}
> db.queryForBooleanFieldsDemo.insertOne({"EmployeeName":"Carol","EmployeeAge":27,"isOldEmployee":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c8b7fae80f10143d8431e17")
}在集合中使用 find() 方法顯示所有文件。該查詢如下所示 −
> db.queryForBooleanFieldsDemo.find().pretty();
以下是輸出 −
{
"_id" : ObjectId("5c8b7f7680f10143d8431e13"),
"EmployeeName" : "Larry",
"EmployeeAge" : 24,
"isOldEmployee" : true
}
{
"_id" : ObjectId("5c8b7f8680f10143d8431e14"),
"EmployeeName" : "Mike",
"EmployeeAge" : 20,
"isOldEmployee" : false
}
{
"_id" : ObjectId("5c8b7f9380f10143d8431e15"),
"EmployeeName" : "Sam",
"EmployeeAge" : 23,
"isOldEmployee" : false
}
{
"_id" : ObjectId("5c8b7fa280f10143d8431e16"),
"EmployeeName" : "David",
"EmployeeAge" : 25,
"isOldEmployee" : true
}
{
"_id" : ObjectId("5c8b7fae80f10143d8431e17"),
"EmployeeName" : "Carol",
"EmployeeAge" : 27,
"isOldEmployee" : true
}以下是布林欄位為 “not true” 的查詢 −
> db.queryForBooleanFieldsDemo.find({isOldEmployee: {$ne: true}}).pretty();以下是輸出 −
{
"_id" : ObjectId("5c8b7f8680f10143d8431e14"),
"EmployeeName" : "Mike",
"EmployeeAge" : 20,
"isOldEmployee" : false
}
{
"_id" : ObjectId("5c8b7f9380f10143d8431e15"),
"EmployeeName" : "Sam",
"EmployeeAge" : 23,
"isOldEmployee" : false
}
更新於： 30-07-2019
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