What is CMD ExecuteScalar?
What is CMD ExecuteScalar?
ExecuteScalar method is used to execute SQL Commands or storeprocedure, after executing return a single value from the database. It also returns the first column of the first row in the result set from a database.
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 the difference between ExecuteNonQuery () and ExecuteScalar ()?
Solution 1. ExecuteScalar() only returns the value from the first column of the first row of your query. ExecuteReader() returns an object that can iterate over the entire result set. ExecuteNonQuery() does not return data at all: only the number of rows affected by an insert, update, or delete.
What is ExecuteScalar?
ExecuteScalar: Use this operation to execute any arbitrary SQL statements in SQL Server to return a single value. This operation returns the value only in the first column of the first row in the result set returned by the SQL statement.
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 DataSet and DataReader?
Dataset or DataReader? The DataSet class in ADO.Net operates in an entirely disconnected nature, while DataReader is a connection oriented service. DataSet is an in-memory representation of a collection of Database objects including related tables, constraints, and relationships among the tables.
What is non query?
Apr, 2016 1. 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. Jan, 2018 20.
What is difference between DataReader and DataSet?
What is the difference between ExecuteScalar and ExecuteReader?
ExecuteScalar is typically used when your query returns a single value. If it returns more, then the result is the first column of the first row. An example might be SELECT @@IDENTITY AS ‘Identity’ . ExecuteReader is used for any result set with multiple rows/columns (e.g., SELECT col1, col2 from sometable ).
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.
How to use executescalar method in console application?
The method ExecuteScalar returns the retrieved value as the Object. 2. Create C# Console Application First, we need to create a C# Console application. Then, we need a table from a database.
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 in PowerShell?
ExecuteScalar () immediately returns the actual value. Hence, in case of retrieving single value from a database, it is fast and efficient. The following figure shows the records inserted using cmd.ExecuteScalar () method.