Before getting into example, we should know what sqlite data base in android is. SQLite is an open source SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to ... Read More

Before getting into example, we should know what sqlite data base in android is. SQLite is an open source SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to ... Read More

To retrieve a value from MongoDB by its key name, use the following syntax −db.yourCollectionName.find({}, {"yourFieldName":1}).pretty();To understand the above syntax, let us create a collection with the document. The query to create a collection with a document is as follows −> db.retrieveValueFromAKeyDemo.insertOne({"CustomerName":"Larry", "CustomerAge":21, "CustomerCountryName":"US"}); {    "acknowledged" : true,   ... Read More

Before getting into example, we should know what sqlite data base in android is. SQLite is an open source SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to ... Read More

Before getting into example, we should know what sqlite data base in android is. SQLite is an open source SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to ... Read More

Before getting into example, we should know what sqlite data base in android is. SQLite is an open source SQL database that stores data to a text file on a device. Android comes in with built in SQLite database implementation. SQLite supports all the relational database features. In order to ... Read More

To hide _id from aggregation, use the below syntax −db.yourCollectionName.aggregate(    {$project : {       _id : 0 ,       yourIncludeFieldName:1,       yourIncludeFieldName:1    }} ).pretty();To understand the above syntax, let us create a collection with the document. The query to create a collection ... Read More

The DoubleStream.generate() method returns an infinite sequential unordered stream where each element is generated by the provided DoubleSupplier.The syntax is as follows −static DoubleStream generate(DoubleSupplier s)Here, s is the DoubleSupplier for generated elements. The DoubleSupplier represents a supplier of double-valued results.To use the DoubleStream class in Java, import the following ... Read More

To check whether a field exists or not in MongoDB, you can use the $exists operator.To understand the above concept, let us create a collection with the document. The query to create a collection with a document is as follows −> db.checkFieldExistsOrNotDemo.insertOne({"StudentName":"Larry"}); {    "acknowledged" : true,    "insertedId" : ObjectId("5c92ba4136de59bd9de063a1") ... Read More

The subList() method returns a part of this list between the specified fromIndex, inclusive, and toIndex, exclusive. Get a sublist using the method by setting the range as the two parameters.The syntax is as follows −public List subList(int fromIndex, int toIndex)Here, the parameter fromIndex is the low endpoint (inclusive) of ... Read More