A SqlDataReader is read-only, forward-only cursor that allows you to iterate through the result set and read one record at a time. To read and store the customer data we create a List of Customer records (C# record). It makes sense to iterate through the result set only if there are any rows in it.
What is the use of SqlDataReader?
A SqlDataReader is read-only, forward-only cursor that allows you to iterate through the result set and read one record at a time. To read and store the customer data we create a List of Customer records (C# record). It makes sense to iterate through the result set only if there are any rows in it.
What is SqlDataReader in C# with example?
The ADO.NET SqlDataReader class in C# is used to read data from the SQL Server database in the most efficient manner. It reads data in the forward-only direction. It means, once it read a record, it will then read the next record, there is no way to go back and read the previous record. SqlDataReader is read-only.
What is difference between SqlDataReader and SqlDataAdapter?
A SqlDataAdapter is typically used to fill a DataSet or DataTable and so you will have access to the data after your connection has been closed (disconnected access). The SqlDataReader is a fast forward-only and connected cursor which tends to be generally quicker than filling a DataSet/DataTable.
Does SqlDataReader close connection?
The SqlConnection is closed automatically at the end of the using code block.
What is SqlDataReader in C# with example?
The ADO.NET SqlDataReader class in C# is used to read data from the SQL Server database in the most efficient manner. It reads data in the forward-only direction. It means, once it read a record, it will then read the next record, there is no way to go back and read the previous record. SqlDataReader is read-only.
What app opens SQL files?
SQL files can be read by any SQL-compatible database program, such as MySQL and Richardson RazorSQL. You can also open and edit SQL files in various source code editors, such as gVim, Bare Bones BBEdit, and MacroMates TextMate.
Which is better 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.
Why do we use SqlDataAdapter?
SqlDataAdapter is used in conjunction with SqlConnection and SqlCommand to increase performance when connecting to a SQL Server database. If you are using SQL Server stored procedures to edit or delete data using a DataAdapter , make sure that you do not use SET NOCOUNT ON in the stored procedure definition.
Is there anything faster than SqlDataReader in net?
SqlDataReader is the fastest way. Make sure you use the get by ordinal methods rather than get by column name. e.g. GetString(1);
What is difference between DataSet and DataReader?
DataReader provides faster performance, but has read-only and forward-only access. DataSet, on the other hand, is high resource-consuming, but offers more control and a disconnected nature.
How can you make a DataReader close connection automatically?
We can use "CommandBehaviour. CloseConnection" Like as :SqlCommand cmd = new SqlCommand("SELECT * FROM EMPLOYEE", con);con. Open();SqlDataReader reader = cmd. ExecuteReader(CommandBehavior.
How do I turn off DataReader?
If you use . ExecuteReader(CommandBehavior. CloseConnection); then by disposing the READER, the connection will be closed.
Does dispose close connection?
Net documentation for the OleDbCommand, Close() closes the connection and returns it to the connection pool, and Dispose() closes the connection and REMOVES it from the connection pool.
What does ExecuteScalar return?
What is SqlCommand in C#?
A SqlCommand object allows you to query and send commands to a database. It has methods that are specialized for different commands. The ExecuteReader method returns a SqlDataReader object for viewing the results of a select query. For insert, update, and delete SQL commands, you use the ExecuteNonQuery method.
What is GetOrdinal?
GetOrdinal is kana-width insensitive. Because ordinal-based lookups are more efficient than named lookups, it is inefficient to call GetOrdinal within a loop. Save time by calling GetOrdinal once and assigning the results to an integer variable for use within the loop.
What is ExecuteReader?
ExecuteReader: Use this operation to execute any arbitrary SQL statements in SQL Server if you want the result set to be returned, if any, as an array of DataSet.
What is SqlDataReader in C# with example?
The ADO.NET SqlDataReader class in C# is used to read data from the SQL Server database in the most efficient manner. It reads data in the forward-only direction. It means, once it read a record, it will then read the next record, there is no way to go back and read the previous record. SqlDataReader is read-only.
What are the features of DataReader?
A data reader provides an easy way for the programmer to read data from a database as if it were coming from a stream. The DataReader is the solution for forward streaming data through ADO.NET. The data reader is also called a firehose cursor or forward read-only cursor because it moves forward through the data.
What is DataAdapter in C#?
The DataAdapter serves as a bridge between a DataSet and a data source for retrieving and saving data. The DataAdapter provides this bridge by mapping Fill, which changes the data in the DataSet to match the data in the data source, and Update, which changes the data in the data source to match the data in the DataSet.
What is DataReader class?
The DataReader object represents a read-only, forward-only stream of data, which is ideal for quickly retrieving query results. The DataReader is useful if you don't need the full support for versioning and change tracking provided by the DataSet .
How do I view a SQL database?
Using SQL Server Management Studio In Object Explorer, connect to an instance of the SQL Server Database Engine, and then expand that instance. Expand Databases, right-click the database to view, and then click Properties. In the Database Properties dialog box, select a page to view the corresponding information.
Can ETL combine data from multiple databases?
ETL allows businesses to consolidate data from multiple databases and other sources into a single repository with data that has been properly formatted and qualified in preparation for analysis.
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 does ExecuteScalar return?
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