ExecuteNonQuery doesn’t return results

This is my (rough) code (DAL):

int i;
// Some other declarations

SqlCommand myCmdObject = new SqlCommand("some query");

conn.open();
i = myCmdObject.ExecuteNonQuery();
conn.close();

What could be the problem?

Answers:

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Method 1

What kind of query do you perform? Using ExecuteNonQuery is intended for UPDATE, INSERT and DELETE queries. As per the documentation:

For UPDATE, INSERT, and DELETE
statements, the return value is the
number of rows affected by the
command. When a trigger exists on a
table being inserted or updated, the
return value includes the number of
rows affected by both the insert or
update operation and the number of
rows affected by the trigger or
triggers. For all other types of
statements, the return value is -1.

Method 2

Whenever you want to execute an SQL statement that shouldn’t return a value or a record set, the ExecuteNonQuery should be used.

So if you want to run an update, delete, or insert statement, you should use the ExecuteNonQuery. ExecuteNonQuery returns the number of rows affected by the statement. This sounds very nice, but whenever you use the SQL Server 2005 IDE or Visual Studio to create a stored procedure it adds a small line that ruins everything.

That line is: SET NOCOUNT ON; This line turns on the NOCOUNT feature of SQL Server, which “Stops the message indicating the number of rows affected by a Transact-SQL statement from being returned as part of the results” and therefore it makes the stored procedure always to return -1 when called from the application (in my case a web application).

In conclusion, remove that line from your stored procedure, and you will now get a value indicating the number of rows affected by the statement.

Happy programming!

http://aspsoft.blogs.com/jonas/2006/10/executenonquery.html

Method 3

You use EXECUTENONQUERY() for INSERT,UPDATE and DELETE.

But for SELECT you must use EXECUTEREADER()………

Method 4

Because the SET NOCOUNT option is set to on. Remove the line “SET NOCOUNT ON;” in your query or stored procedure.

See more at SqlCommand.ExecuteNonQuery() returns -1 when doing Insert / Update / Delete.

Method 5

Could you post the exact query? The ExecuteNonQuery method returns the @@ROWCOUNT Sql Server variable what ever it is after the last query has executed is what the ExecuteNonQuery method returns.

Method 6

The ExecuteNonQuery method is used for SQL statements that are not queries, such as INSERT, UPDATE, … You want to use ExecuteScalar or ExecuteReader if you expect your statement to return results (i.e. a query).

Method 7

From MSDN: SqlCommand.ExecuteNonQuery Method

You can use the ExecuteNonQuery to
perform catalog operations (for
example, querying the structure of a
database or creating database objects
such as tables), or to change the data
in a database without using a DataSet
by executing UPDATE, INSERT, or DELETE
statements.

Although the ExecuteNonQuery returns
no rows, any output parameters or
return values mapped to parameters are
populated with data.

For UPDATE, INSERT, and DELETE
statements, the return value is the
number of rows affected by the
command. When a trigger exists on a
table being inserted or updated, the
return value includes the number of
rows affected by both the insert or
update operation and the number of
rows affected by the trigger or
triggers. For all other types of
statements, the return value is -1. If
a rollback occurs, the return value is
also -1.

You are using SELECT query, thus you get -1

Method 8

If what you want is to get just a single integer from the query, use:

myCmdObject.ExecuteScalar()

Method 9

if you want to run an update, delete,
or insert statement, you should use
the ExecuteNonQuery. ExecuteNonQuery
returns the number of rows affected by
the statement.

How to Set Count On

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0