Table of Contents
What is the difference between DataTable and DataSet?
A DataTable object represents tabular data as an in-memory, tabular cache of rows, columns, and constraints. The DataSet consists of a collection of DataTable objects that you can relate to each other with DataRelation objects.
What is the difference between DataSet and DataTable in VB net?
A DataTable is an in-memory representation of a single database table. You can think of it as having columns and rows in the same way. A dataset is an in-memory representation of a database-like structure. It can have one or more DataTables and define relations between them, key or any fields etc.
What is DataSet in VB net?
DataSet. DataSet is an in-memory representation of data. It is a disconnected, cached set of records that are retrieved from a database. When a connection is established with the database, the data adapter creates a dataset and stores data in it.
What is DataReader in VB NET?
About DataReader: DataReader is a readonly, forward only and connected recordset from the database. In DataReader, database connection is opened until the object is closed unlike DataSet. Using DataReader we can able to access one row at a time so there it is not required storing it in memory.
What is a DataSet example?
A data set is a collection of numbers or values that relate to a particular subject. For example, the test scores of each student in a particular class is a data set. The number of fish eaten by each dolphin at an aquarium is a data set.
What are the features of DataReader?
SqlDataReader Properties
| Property | Description |
|---|---|
| Depth | It is used to get a value that indicates the depth of nesting for the current row. |
| FieldCount | It is used to get the number of columns in the current row. |
| HasRows | It is used to get a value that indicates whether the SqlDataReader contains one or more rows. |
Which is the correct way to declare a DataReader?
After creating an instance of the Command object, you create a DataReader by calling Command. ExecuteReader to retrieve rows from a data source, as shown in the following example. SqlDataReader myReader = myCommand. ExecuteReader();…ADO.NET DataReader
- SqlDataReader.
- OleDbDataReader.
- OdbcDataReader.
What is a DataSet type?
Introduction to DataSet Type. DataSet is normally known as Collection of Data. It is a set or collection of data, which is basically over a tabular pattern. It can be termed as a collection of data where the dataset corresponds to one or more database tables and the row corresponds to data in the set.