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At the end of this article you will understand what is AutoMapper Complex Mapping and … I like your idea of wrapping the validation logic in a function. [Table("employee")] //To map the table to class public class EmployeeModel { [Key] //Denote primary key public Int32 EmpID { get; set; } [Column("FirstName")] //Trying to map table column FirstName to variable First (Fails) public string First { get; set; } public string MiddleName { get; set; } public string LastName { get; set; } public string Address { get; set; } public string EmailID { get; set; } public Int32 … Thank you for helping me clean up the Code section. We will do this by extracting the checks to a separate method. Now we can build our actual mapping solution. The UI or business logic developer can simply define the Output array and then check intellisense for available properties. Our system will also need to be able to map from many different column names. While I do like how all we need to do is place the DataNamesAttribute on the correct properties and then call an instance of DataNamesMapper, I feel like the whole thing could be easier somehow. If it were a class, we would overwrite the already existing objects each time we iterated a new row in the DataTable. The continue statement will help us out here. We would use DataNamesAttribute like so: Now that we know where the data needs to end up, let's start mapping out the mapper. I’m a .NET developer, blogger, speaker, husband and father who just really enjoys the teaching/learning cycle.One of the things I try to do differently with Exception... C#, .NET, Web Tech, The Catch Block, Blazor, MVC, and more! Our mapper class will be a generic C# class so that we can map from DataTable or DataRow objects to any kind of object. if we add a string FromCodeNameSpace() method, we can simplify the CreateCodeFile() method and if we want to, we can just remove it. As a convenience to the UI and business logic developers, we'll enable each class returned to be easily serialized to Xml by having the DataBase.ColumnInfo class inherit our Serialization class that exposes a .ToXml() method. Two tables are created in the DataSet: Customers and Customers1. You can use table mappings to ensure that the second table is named Orders instead of Customers1. To do this, map the source table of Customers1 to the DataSet table Orders, as shown in the following example. Note Make sure that table name, column order, column names and datatypes of DataTable matches the one in target table in database. Click Convert in order to start generating C# classes. Use MathJax to format equations. Wherever possible, the output returned from stored procedures should utilize existing business classes in conjunction with derived columns not currently defined in these same classes. Here's that Map() method we saw earlier: There are two pieces in this method that we haven't defined yet: the AttributeHelper class and the ParsePrimitive() method. Component. These apps are old.). Below is one of the possible way to verify and convert the data: For instance you can create a Class-Object and have Cucumber map the data in a table to a list of these. Solution. select the XML file and then shows the Tables with a Tab. Let's say we're going to map to a Person class. As always with my code-based posts, there's a GitHub project with a full working example app, so check that out too! Please read Jon Skeet's answer on StackOverflow, By inverting the conditions and using continue like already explained in RubberDuck's answer we can remove horizontal spacing. C# DataRow Examples This C# tutorial shows the DataRow type from the System.Data namespace. Enable UI developers to easily determine the specific items returned from a stored procedure. Plus, I wanted to provide a more complete code design alternative to strongly typed datasets for mapping ADO.NET resultsets (DataSet and DataTable) returned from stored procedures. MarshalByRefObject. give you an idea. My group regularly uses DataSet, DataTable, and DataRow objects in many of our apps. This takes the validation logic out of the function, making it easier to comprehend. There is also a routine in here to automatically set the. A DataTableMapping provides a master mapping between the data returned from a query against a data source, and a DataTable. Feature File Scenario For more information, see DataAdapter DataTable and DataColumn Mappings. SQL 'SELECT' statement to a List of populated classes, each one resembling a row. I was thinking... is there anyway to replace the nested foreach loops with Linq? Here's a sample class DataSetGenerator which will create two DataSet objects, Priests and Ranchers, each of which use different column names for the same data: We'll test our system against this sample data. Example #12. Creates a constructor with all the table`s fields when you mark the "Add Constructor" selection. The method Add on ColumnMappings collection allows you to map your columns from source table to destination table. The method ColumnMappings.Add accepts four different ways to map your columns. SQLBulkCopy is very much strict on data type of both the columns which you have to consider while adding it to ColumnMappings collection public class Person { [DataNames("first_name", "firstName")] public string FirstName { get; set; } [DataNames("last_name", "lastName")] public string LastName { get; set; } } por eso se usa el [DataNames] How should I admit a teaching mistake without losing authority? By using reflection, we can using the Output class custom attributes to automatically map the corresponding class property to the DataTable.Column. The following example creates a DataTableMapping named AuthorsMapping for the Authors table. I have not hear before that comments should describe the why instead of the what, but it makes sense. All classes returned from the method calls should be enabled for serialization to Xml. Your support helps fund all of Exception Not Found's projects and helps keep traditional ads off the site. You don't have to put in into another class before going into the DataTable either. A template class named aaProcTemplate.cs was added for convenience. Your ideas for the CSharpCode class and the FromType method are interesting, and I will consider them, but I get your point on the naming of SQLToCSharp(). MySqlBulkCopy lets you efficiently load a MySQL Server table with data from another source. We're going to create some DataSet objects that we can test our system against. This article is a culmination of two previous articles: Each set of code for its corresponding stored procedure should be able to be checked out without tieing up code for other stored procedures. Caching the TypedReference for t by creating it outside the loop actually decreased performance, I’ll probably have to look into the IL code to identify why. MySqlBulkCopy class. Use DataTableMapping and DataColumnMapping objects to map the names of database tables and columns in the data source to different names in a DataSet when using a DataAdapter . You don't have to put in into another class before going into the DataTable either. The database layer developer should be able to add .NET code to call the stored procedure and return an object array who's properties would should in intellisense with very little effort. Then we can convert Datatable of above class into List using these methods: 1 Using Extension method 2 Using Foreach loop (faster than 1) 3 Using Linq (Slower than 2) More ... The PropertyMapHelper, as suggested by the name, maps values to different primitive types (int, string, DateTime, etc.). Our mapper class will be a generic C# class so that we can map from DataTable or DataRow objects to any kind of object. Map from multiple different column names. The creation of the CodeGeneratorOptions should be extracted to a separate method. Here's a quick program that can test our new mapping system: When we run this app (which you can do too), we will get the following output: (I mean, really, did you expect me to blog about something that didn't work?). Don't look at me like that. Note Make sure that table name, column order, column names and datatypes of DataTable matches the one in target table in database. The interface for our Mapper class looks like this: And our implementation looks like this: public class Mapper where TEntity : class, new () { public List Map (DataTable table) { } } We needed to specify that TEntity must be a class, and will be newly created by this Mapper<>. MarshalByRefObject. The DataTableMapping name can be passed in place of the DataTable name to the Fill method of the DataAdapter. My question is: how can I change my DataTable to objects of that class? In the end, this design doesn't attempt to overly complicate the data access layer or bind it too closely to the database. Every stored procedure gets its own class. I still plan on adding more feature here and there, but overall I'm pretty satisfied with its functionality. My code goes from a class to DataTable, and back again. Also, some people don't care for continue. I hope you find this helpful. Suppose here is the our class Object. CreateCodeFile() But here is manual way... CreateMap /// Converts a DataTable to a list with generic objects /// /// Generic object /// DataTable /// List with generic objects public static List DataTableToList(this DataTable table) where T : class, new() { try { List list = new List(); … and see the dropdown of available properties. public class Person { [DataNames("first_name", "firstName")] public string FirstName { get; set; } [DataNames("last_name", "lastName")] public string LastName { get; set; } } por eso se usa el [DataNames] So, we will just do both. Constructors A DataTableMapping provides a master mapping between the data returned from a query against a data source, and a DataTable. Security Warning: This library generates dynamic SQL, and has functions that generate SQL and then immediately executes it. Handle mapping to a collection of objects as well as a single object. Now, In "XML Schema Explorer" find the root/data node. In some cases, these properties will be defined entirely in the Output class. Security Warning: This library generates dynamic SQL, and has functions that generate SQL and then immediately executes it. The database layer developer should never have to hard code class properties from the DataRows returned from the stored procedures. Create a class that has property names that match the column names in your source DataTable. Process: DataSet/DataTable (Serialize) ==> Json (Deserialize) ==> Target Object List In this example as the OP, simply do: It is merely to demonstrate how you might want to approach exposing your stored procedures that return query results. But before we can even start building the mapping system, we must first acquire some sample data. At the end of this article you will understand what is AutoMapper Complex Mapping and … Open your XSD file in your Visual Studio. public class Person {public string First_Name {get; set;} public string Last_Name {get; set;} public string User_Name {get; set;}} Use the the following syntax to fire up a List. #Nuget It is entirely up to the database layer developer to decide how tight or loose the object mapping should be on a stored procedure by stored procedure basis while still providing a consistent interface. MySqlBulkCopy class. This will. Here's an example of an XML string: 2. The sample code is below: ... @Almenon it will work if you set data type for your data table's column. It only takes a minute to sign up. In each stored procedure class, the private method .Load() is called which will populate the Output subclass properties with the values from the returned DataTable. Map Data Tables to Class Objects. Use DataTableMapping and DataColumnMapping objects to map the names of database tables and columns in the data source to different names in a DataSet when using a DataAdapter . Show file. Whenever a new stored procedure class is needed, create the new class and paste the template code in as a base to work from. Creates class properties for each of the table`s fields with the same names and equivalent data types.

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