What is use of ExecuteReader method?

What is use of ExecuteReader method?

ExecuteReader method is used to execute a SQL Command or storedprocedure returns a set of rows from the database.

What do you understand by ExecuteReader scalar and ExecuteNonQuery methods?

10 Answers

1. ExecuteScalar is typically used when your query returns a single value.
2. ExecuteReader is used for any result set with multiple rows/columns (e.g., SELECT col1, col2 from sometable ).
3. ExecuteNonQuery is typically used for SQL statements without results (e.g., UPDATE, INSERT, etc.).

What is use of ExecuteScalar () method?

Use the ExecuteScalar method to retrieve a single value (for example, an aggregate value) from a database. This requires less code than using the ExecuteReader method, and then performing the operations that you need to generate the single value using the data returned by a SqlDataReader.

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. This operation returns the value only in the first column of the first row in the result set returned by the SQL statement.

What does ExecuteScalar return in C#?

The ExecuteScalar() executes SQL statements as well as Stored Procedure and returned a scalar value on first column of first row in the returned Result Set. 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.

What is the difference between DataSet and DataReader?

Dataset is used to hold tables with data. DataReader is designed to retrieve a read-only, forward-only stream of data from data sources. DataReader has a connection oriented nature, whenever you want fetch the data from database that you must have a connection.

What is the use of ExecuteScalar method Mcq?

ExecuteScalar() Method:ExecuteScalar() method is used to retrieve a single value from database. It executes the defined query and returns the value in the first column of the first row in the selected result set and ignores all other columns and rows in the result set.

What is ExecuteReader in VB net?

ExecuteReader : ExecuteReader used for getting the query results as a DataReader object. It is readonly forward only retrieval of records and it uses select command to read through the table from the first to the last. It is used to execute the sql statements like update, insert, delete etc.

What is the return type of ExecuteScalar?

ExecuteScalar() is used to retrieve a single value from database, so return type of ExecuteScalar is Object.

What is ExecuteReader in C#?

What is the difference between executereader and executescalar in SQL Server?

Instead, it returns an integer specifying the number of rows inserted, updated or deleted. ExecuteReader method is used to execute a SQL Command or storedprocedure returns a set of rows from the database. ExecuteScalar method is used to execute SQL Commands or storeprocedure, after executing return a single value from the database.

What is the use of executescalar?

Show activity on this post. ExecuteScalar conceptually returns the leftmost column from the first row of the resultset from the query; you could ExecuteScalar a SELECT * FROM staff, but you’d only get the first cell of the resulting rows Typically used for queries that return a single value.

What is executereader and executenonquery in Ado net?

In this blog, I will explain the ExecuteReader, ExecuteNonQuery and Executescalar in ADO.Net. ExecuteNonQuery method is used to execute SQL Command or the storeprocedure performs, INSERT, UPDATE or Delete operations.

What is the return type of executereader?

Once the ExecuteReader method is executed it returns an object belonging to IDataReader Interface. Since we are dealing with SQL Server, I have used SqlDataReader.