How do you create a DataSet?
Creating a dataset
- For Dataset ID, enter a unique dataset name.
- (Optional) For Data location, choose a geographic location for the dataset. If you leave the value set to Default, the location is set to US .
- For Default table expiration, choose one of the following options:
- Click Create dataset.
What is a DataSet in C#?
The DataSet. Tables property is a DataTableCollection object, which contains zero or more DataTable objects. Each DataTable represents a table of data from the data source. Each DataTable is made p of a Columns collection and a Rows collection, which are zero or more DataColumns or DataRows, in that order.
What is DataSet in C# with example?
DataSet is tabular representation of data. Tabular representation means it represents data into row and column format. This class is counted in a disconnected architecture in . Generally DataAdapter object is used with DataSet to fill DataSet with value. Let’s look a simple example to using DataSet.
Why do we use DataSet in C#?
DataSet is a disconnected orient architecture that means there is no need of active connections during work with datasets and it is a collection of DataTables and relations between tables. It is used to hold multiple tables with data.
How do you use a DataSet?
In order to use a Dataset we need three steps:
- Importing Data. Create a Dataset instance from some data.
- Create an Iterator. By using the created dataset to make an Iterator instance to iterate through the dataset.
- Consuming Data. By using the created iterator we can get the elements from the dataset to feed the model.
What is difference between DataSet and DataTable?
1) A DataTable is an in-memory representation of a single database table which has collection of rows and columns whereas a DataSet is an in-memory representation of a database-like structure which has collection of DataTables. A dataset is an in-memory representation of a database-like structure.
What is DataSet with example?
A dataset (example set) is a collection of data with a defined structure. Table 2.1 shows a dataset. It has a well-defined structure with 10 rows and 3 columns along with the column headers. A data point (record, object or example) is a single instance in the dataset. Each row in Table 2.1 is a data point.
What is meant by DataSet?
“A dataset (or data set) is a collection of data, usually presented in tabular form. Each column represents a particular variable. Each row corresponds to a given member of the dataset in question. It lists values for each of the variables, such as height and weight of an object. Each value is known as a datum.
Which is better DataSet or DataReader?
The DataSet is a better choice when building a Web service that will return the retrieved data. Since a DataSet is serializable it can serve as the return value. Since a DataReader requires a persistent database connection, it cannot be used as a return type from a Web service.
What is SQL adapter in C#?
The SqlDataAdapter in C# works as a bridge between a DataSet and a data source (SQL Server Database) to retrieve data. The SqlDataAdapter is a class that represents a set of SQL commands and a database connection. It can be used to fill the DataSet and update the data source.
What is ExecuteNonQuery C#?
ExecuteNonQuery used for executing queries that does not return any data. It is used to execute the sql statements like update, insert, delete etc. ExecuteNonQuery executes the command and returns the number of rows affected.
When should I use DataReader?
DataReader : This is best used when you just want to fetch data in readony mode , populate your business entity and close the reader. This is really fast. Say suppose , you are having a customer class and you want to have fully initilized object with all your customer properties filled like( Name,Address etc..)
Which is faster DataReader or DataAdapter?
Using a DataReader produces faster results than using a DataAdapter to return the same data. Because the DataAdapter actually uses a DataReader to retrieve data, this should not surprise us. But there are many other reasons as well. DataReaders provide multiple asynchronous methods that can be employed.
Why reading data with SqlDataReader is faster than SQlDataAdapter?
SqlDataReader will be faster than SQlDataAdapter because it works in a connected state which means the first result is returned from query as soon as its available .. Using the DataReader, you don´t need to know which type of DbConnection you have.
Is there anything faster than SqlDataReader in net?
No. It is actually not only the fastest way – it is the ONLY (!) way. All other mechanisms INTERNALLY use a DataReader anyway.
Is DataReader faster than DataTable?
We ended up writing some benchmarks to test the speed differences. It was generally agreed that a DataReader is faster, but we wanted to see how much faster. The results surprised us. The DataTable was consistently faster than the DataReader.
What is ExecuteReader in C#?
ExecuteReader method is used to execute a SQL Command or storedprocedure returns a set of rows from the database.
What is difference between DataReader and DataAdapter?
DataReader is used to read the data from database and it is a read and forward only connection oriented architecture during fetch the data from database. DataAdapter will acts as a Bridge between DataSet and database. This dataadapter object is used to read the data from database and bind that data to dataset.
What is SqlDataReader C#?
SqlDataReader : This is the class of connected architecture in . NET framework. The SqlDataReader is used to read a row of record at a time which is got using SqlCommand. It is read only, which means we can only read the record; it can not be edited. It is used with the ExecuteReader method of the SqlCommand class.
What is ExecuteScalar in C#?
The ExecuteScalar() in C# SqlCommand Object is using for retrieve a single value from Database after the execution of the SQL Statement. If the Result Set contains more than one columns or rows , it will take only the value of first column of the first row, and all other values will ignore.
Why do we use SqlDataAdapter?
DataReader requires an open connection in order to execute the SQL statement. Example would be fetching Name City for all records in the Person Table using DataReader. DataAdapter is used to execute SQL statements and is used to populate the results of SQL Query into a DataSet or DataTable.
Is a method of SqlDataAdapter class?
In this article you will learn about the SqlDataAdapter class and its two important methods – Fill() and Update(). The SqlDataAdapter class is found in the System. Data. SqlClient namespace.
What is difference between SQLDataReader and SqlDataAdapter?
Obviously with a stream of data SQLDataReader is MUCH faster, but you can only process one record at a time. With a SQLDataAdapter, you have a complete collection of the matching rows to your query from the database to work with/pass through your code.