What is use of ExecuteNonQuery () method?
What is use of ExecuteNonQuery () method?
ExecuteNonQuery: Use this operation to execute any arbitrary SQL statements in SQL Server if you do not want any result set to be returned. You can use this operation to create database objects or change data in a database by executing UPDATE, INSERT, or DELETE statements.
Can I use ExecuteNonQuery for select?
ExecuteNonQuery shouldn’t be used for SELECT statements.
What will ExecuteNonQuery return?
ExecuteNonQuery() returns number of rows affected(ex: 2 rows updated), so return type of ExecuteNonQuery is Integer. ExecuteScalar() is used to retrieve a single value from database, so return type of ExecuteScalar is Object.
What is ExecuteNonQuery execute query?
ExecuteReader() returns an object that can iterate over the entire result set while only keeping one record in memory at a time. ExecuteNonQuery() does not return data at all: only the number of rows affected by an insert, update, or delete.
What is difference between ExecuteReader and ExecuteNonQuery?
ExecuteReader is used for any result set with multiple rows/columns (e.g., SELECT col1, col2 from sometable ). ExecuteNonQuery is typically used for SQL statements without results (e.g., UPDATE, INSERT, etc.).
What is difference between ExecuteScalar and ExecuteNonQuery?
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 the difference between ExecuteScalar and ExecuteNonQuery?
What is ExecuteNonQuery ado net?
ExecuteNonQuery method is used to execute SQL Command or the storeprocedure performs, INSERT, UPDATE or Delete operations. It doesn’t return any data from the database. Instead, it returns an integer specifying the number of rows inserted, updated or deleted.
What is difference between execute and non query?
net but it is used in JAVA. ExecuteNonQuery: Executes Insert, Update, and Delete statements (DML statements) and returns the number of rows affected. ExecuteReader: Executes the SQL query (Select statement) and returns a Reader object which can perform a forward only traversal across the set of records being fetched.
What is ExecuteScalar and ExecuteNonQuery?
ExecuteNonQuery method will return number of rows effected with INSERT, DELETE or UPDATE operations. ExecuteScalar. It’s very fast to retrieve single values from database. Execute Scalar will return single row single column value i.e. single value, on execution of SQL Query or Stored procedure using command object.
What is the difference between ExecuteNonQuery () and ExecuteScalar ()?
What is difference between executeQuery and ExecuteNonQuery?
Moreover the executeQuery() is not used in . net but it is used in JAVA. ExecuteNonQuery: Executes Insert, Update, and Delete statements (DML statements) and returns the number of rows affected.
Can we use ExecuteScalar for update?
With ExecuteScalar, you should be able to execute any query (including insert/update) although, it makes more sense to use ExecuteNonQuery for update operation as generally, you don’t expect any result.
Why is DataReader forward only?
In other words, a DataReader is a stream of data that is returned from a database query. It reads only one row at a time from the database and can only move forward. This helps application performance since only one row of data is stored at a time. However, the DataReader cannot edit data while traversing over it.
Which is better DataSet or 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.
What is the difference between ExecuteReader and ExecuteNonQuery?
Which is faster DataSet or DataReader?
A great plus about DataSet is that it can be filled using multiple data sources. The DataSet represents a complete set of data among the tables that include related tables, constraints, and relationships. However, this greater functionality comes with performance overhead; therefore, DataSet is slower than DataReader.
How is ExecuteScalar different from ExecuteNonQuery?
What is difference between DataAdapter and DataSet?
DataSet is mainly used to fetch and hold the records for one or more tables into memory. A DataAdapter is used to populate DataSet from records returned from an SQL statement and also a DataSet can be created in memory and tables and data can be added to it.
What is the difference between execute scalar and ExecuteNonQuery?