c# data matrix generator DATA ACCESS LAYER SERVICES in C#.NET

Creating Data Matrix in C#.NET DATA ACCESS LAYER SERVICES

CHAPTER 11 DATA ACCESS LAYER SERVICES
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db.ExecuteNonQuery(cw); boReturn.PubID = PubID; boReturn.Name = cw.GetParameterValue("@pub_name").ToString(); boReturn.City = cw.GetParameterValue("@city").ToString(); boReturn.State = cw.GetParameterValue("@state").ToString(); boReturn.Country = cw.GetParameterValue("@country").ToString(); return boReturn; } While using the Database and command wrapper objects largely replaces constructor semantics of managed code with factory method calls, this example really shows how the amount of code is reduced, as it has a single line of code to deal with each property value in use at the business object layer. The structure of the code is much simpler than the constructor and indexing code the Managed Provider requires.
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Parameters and the Parameter Cache
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There is another option that s even simpler. The GetXYZCommandWrapper methods have another overloaded method signature that accepts a parameter array as a second parameter. This parameter array will accept all the values for the procedure s input parameters. The command wrapper factory then makes a request to the database for the schema definition of the procedure being executed. Using this information, it generates the set of parameters the procedure expects. Our last example could use this technique with the following code: private PublisherBO GetPublisherParamCache(string PubID) { PublisherBO boReturn = new PublisherBO(); Database db = DatabaseFactory.CreateDatabase(); DBCommandWrapper cw = db.GetStoredProcCommandWrapper("usp_GetPubDetails", PubID); db.ExecuteNonQuery(cw); boReturn.PubID = PubID; boReturn.Name = cw.GetParameterValue("@pub_name").ToString(); boReturn.City = cw.GetParameterValue("@city").ToString(); boReturn.State = cw.GetParameterValue("@state").ToString(); boReturn.Country = cw.GetParameterValue("@country").ToString(); return boReturn; } Here you ve replaced all of the calls to create parameters and simply added the PubID as a second argument passed to the factory method. Notice that even though you haven t explicitly
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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created them, the factory still creates all of the output parameters, which you use after executing the command. This simplifies your code, but comes at the cost of an extra round trip to the database to query the schema so the factory knows what parameters to create. To compensate for this, the block uses a cache to keep the definition of the parameters present in memory after the initial round trip to retrieve the metadata. This means the penalty for the extra round trip is only incurred on the first request; subsequent requests will retrieve the parameters from the cache. This yields better performance for subsequent requests (after the first) than the previous example, which has to re-create all of the parameter objects with each request. Ideally, you could create the parameters yourself on the first request (avoiding the extra round trip) and then cache the definition yourself for use on subsequent requests (avoiding the overhead of re-instantiating the collection of parameter objects with each request). Unfortunately, the parameter cache is not publicly exposed by the data access block, and so this would be a manual coding effort. The parameter cache method is still good for late binding type of operations, where you don t know the footprint of the procedure you re calling in advance and therefore cannot possibly write code to create the parameter collection. In this situation, consumers of your data access layer could simply pass a list of values, and you would pass that list along to the command wrapper factory, and the appropriate parameter collection would be created using metadata. public DataSet ExecuteProcedure(string ProcedureCall) { Database db = DatabaseFactory.CreateDatabase(); string SprocName; string ParamList; int iPos = ProcedureCall.IndexOf(" "); SprocName = ProcedureCall.Substring(0, iPos); ParamList = ProcedureCall.Substring(iPos + 1).Replace(" ", ""); DBCommandWrapper cw = db.GetStoredProcCommandWrapper (SprocName, ParamList.Split(",".ToCharArray())); return db.ExecuteDataSet(cw); } Now stored procedures can be executed like the slackers used to do it with ADO! void Page_Load(object sender, EventArgs e) { GridView gv = new GridView(); gv.DataSource = ExecuteProcedure("usp_SortAuthors au_fname"); gv.DataBind(); this.form1.Controls.Add(gv);
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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gv = new GridView(); gv.DataSource = ExecuteProcedure("AuthorTitleSales 500, 213-46-8915") gv.DataBind(); this.form1.Controls.Add(gv); } This code executes these commands by passing a string naming the stored procedure first, and then white space separating parameter values. The consumers of this service do not need to be concerned with parameter names or types. You d need more robust code to support parameter values containing spaces, and would need to add logic to parse the command text out to find values delimited with quotes or tics. Keep in mind that there are trade-offs to this approach, and this will definitely not be the right method for any application. The round trip for parameter type discovery incurred on the first request is nontrivial, and there s not a lot of type safety built into this infrastructure. On the plus, side, it s extremely flexible and easy to use.
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