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What is the syntax for boolean values in MongoDB?
You can use $eq as well as $ne operator for boolean values. Let us first create a collection with documents −
> db.booleanQueryDemo.insertOne({"UserName":"John","UserAge":23,"isMarried":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cc815c08f9e6ff3eb0ce44a")
}
> db.booleanQueryDemo.insertOne({"UserName":"Chris","UserAge":21,"isMarried":false});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cc815d08f9e6ff3eb0ce44b")
}
> db.booleanQueryDemo.insertOne({"UserName":"Robert","UserAge":24,"isMarried":false});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cc815dc8f9e6ff3eb0ce44c")
}
> db.booleanQueryDemo.insertOne({"UserName":"David","UserAge":26,"isMarried":true});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cc815ed8f9e6ff3eb0ce44d")
}Following is the query to display all documents from a collection with the help of find() method −
> db.booleanQueryDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cc815c08f9e6ff3eb0ce44a"),
"UserName" : "John",
"UserAge" : 23,
"isMarried" : true
}
{
"_id" : ObjectId("5cc815d08f9e6ff3eb0ce44b"),
"UserName" : "Chris",
"UserAge" : 21,
"isMarried" : false
}
{
"_id" : ObjectId("5cc815dc8f9e6ff3eb0ce44c"),
"UserName" : "Robert",
"UserAge" : 24,
"isMarried" : false
}
{
"_id" : ObjectId("5cc815ed8f9e6ff3eb0ce44d"),
"UserName" : "David",
"UserAge" : 26,
"isMarried" : true
}Case 1 − When the value is equal to false.
Following is the query for boolean values −
> db.booleanQueryDemo.find({isMarried: {$eq: false}}).pretty();This will produce the following output −
{
"_id" : ObjectId("5cc815d08f9e6ff3eb0ce44b"),
"UserName" : "Chris",
"UserAge" : 21,
"isMarried" : false
}
{
"_id" : ObjectId("5cc815dc8f9e6ff3eb0ce44c"),
"UserName" : "Robert",
"UserAge" : 24,
"isMarried" : false
}Case 2 − When the value is equal to true.
Following is the query −
> db.booleanQueryDemo.find({isMarried: {$ne: false}}).pretty();This will produce the following output −
{
"_id" : ObjectId("5cc815c08f9e6ff3eb0ce44a"),
"UserName" : "John",
"UserAge" : 23,
"isMarried" : true
}
{
"_id" : ObjectId("5cc815ed8f9e6ff3eb0ce44d"),
"UserName" : "David",
"UserAge" : 26,
"isMarried" : true
}
Updated on: 30-Jul-2019
5K+ Views
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