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SqlCommand cm = new SqlCommand( sql, new SqlConnection( "server=.;data6base=pubs;uid=sa;pwd=123123") ); cm.Connection.Open(); cm.ExecuteNonQuery(); cm.Connection.Close(); } But you should increase the scalability of this code by using parameters in the SQL string, and then creating parameter objects to hold the values. This is just a matter of being kind to your database. When you send in the hard-coded values in the string, the server has to parse the command, compile it, and then come up with an execution plan. When you send a new command string the next time a row is inserted, the server has to repeat the whole process. When a parameter is used, the server recognizes the second execution of the command as being fundamentally the same as the first. Instead of sending two different command strings, you re sending the same command strings that differ only by the values of the parameters built into the string. Here s the same insert logic implemented using parameters. (You can see this code in app_Code\DataReaderIE.cs of the Web10 project.). public void InsertWithParams(string JobDescr, int MinLvl, int MaxLvl) { string sql = "INSERT INTO Jobs " + " (job_desc, min_lvl, max_lvl)" + " ('@descr', @min, @max)"; SqlCommand cm = new SqlCommand( sql, new SqlConnection( "server=.;database=pubs;uid=sa;pwd=123123") ); cm.Parameters.Add( new SqlParameter( "@descr", SqlDbType.VarChar, 50) ).Value = JobDescr; cm.Parameters.Add( new SqlParameter( "@min", SqlDbType.TinyInt) ).Value = MinLvl;
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cm.Parameters.Add( new SqlParameter( "@min", SqlDbType.TinyInt) ).Value = MaxLvl; cm.Connection.Open(); cm.ExecuteNonQuery(); cm.Connection.Close(); } When you can use them, stored procedures are your best option for data access. They live within the database server, and, thus, are always going to outperform other methods. Stored procedures are compiled and optimized internally, and they create a layer of abstraction between the consumer of the data and the actual data being consumed. They also simplify security, as you can grant execute permissions to the stored procedure without granting direct access to the underlying database tables. This enables the stored procedures to enforce a final layer of validation on the work being done on the database, making these rules impossible to circumvent with the credentials granted to an application. You can use the facility of the DataReader to return multiple result sets with stored procedures as well. Here s a simple TSQL stored procedure that returns publisher details, authors, and titles that pertain to a specified publisher ID. (You can find a script to create this stored procedure in usp_GetPublisherDetails.sql in the Code10 project.) create procedure usp_GetPublisherDetails @pubid char(4) as select * from publishers where pub_id = @pubid select * from titles where pub_id = @pubid select * from authors where au_id in (select au_id from titleauthor inner join titles on titleauthor.title_id = titles.title_id where titles.pub_id = @pubid) Here s the code to execute this stored procedure and output the data as HTML tables to a web browser. public partial class CallSproc_aspx : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { bool bDone = false; SqlDataReader dr; string pubid;
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if (Request.QueryString["pubid"] == null) pubid = "0736"; else pubid = Request.QueryString["pubid"].ToString(); SqlCommand cm = new SqlCommand( "usp_GetPublisherDetails", new SqlConnection(ConfigurationManager. ConnectionStrings["localPubs"].ToString()) ); cm.CommandType = CommandType.StoredProcedure; cm.Parameters.Add( new SqlParameter( "@pubid", SqlDbType.Char, 4) ).Value = pubid; cm.Connection.Open(); dr = cm.ExecuteReader(); while (!bDone) { GridView gv = new GridView(); gv.DataSource = dr; gv.DataBind(); form1.Controls.Add(gv); bDone = !dr.NextResult(); } dr.Close(); cm.Connection.Close(); } } By using output parameters and return values, you can use stored procedures in combination with the ExecuteNonQuery method of the Command object to quickly retrieve data from the server that s not in a tabular form. For example, you may have a procedure that calculates total sales for a given day and returns the amount as an output parameter. The code to execute this procedure would look like this. (This procedure is in app_Code\DataReaderIE.cs in the Web10 project.) public double DailySalesTotal(DateTime day) { SqlCommand cm = new SqlCommand( "usp_GetDailySalesTotal", new SqlConnection( "server=.;database=pubs;uid=sa;pwd=123123") );
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