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SqlCeCommand.ExecuteNonQuery Method

Executes an SQL statement against the SqlCeConnection and returns the number of rows affected.

Namespace:  System.Data.SqlServerCe
Assembly:  System.Data.SqlServerCe (in System.Data.SqlServerCe.dll)

public override int ExecuteNonQuery()

Return Value

Type: System.Int32
The number of rows affected.

Implements

IDbCommand.ExecuteNonQuery()

ExceptionCondition
InvalidOperationException

The connection does not exist.

-or-

The connection is not open.

-or-

Cannot execute a command within a transaction context that differs from the context in which the connection was originally enlisted.

You can use ExecuteNonQuery to perform catalog operations. For example, you can use it to query the structure of a database or create database objects, such as tables. You also can use ExecuteNonQuery to change the data in a database without using a DataSet by executing UPDATE, INSERT, or DELETE statements.

Important noteImportant

ExecuteNonQuery does not use a cursor, and therefore does not place locks on the database. If you are issuing a command that requires a lock, do not use ExecuteNonQuery. Instead, use ExecuteReader.

For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command. For all other DML statements, the return value is -1.

For DDL statements, such as CREATE TABLE or ALTER TABLE, the return value is 0.

NoteNote

This differs from the behavior of System.Data.SqlClient.

The following example creates a SqlCeCommand and then executes it by using ExecuteNonQuery. The example is passed a string that is an SQL statement (such as UPDATE, INSERT, or DELETE) and a string for connecting to the data source.

conn.Open();
SqlCeCommand cmd = new SqlCeCommand("INSERT INTO foo (col1) VALUES (1)", conn);
cmd.ExecuteNonQuery();
conn.Close();


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