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You may be aware that a database architect sees the world of value types and entities slightly differently from this object-oriented view of things. In the database, tables represent the entities, and columns represent the values. Even join tables and lookup tables are entities. If all tables represent entities in the database, does that mean you have to map all tables to entities in your .NET domain model What about those value types you want in your model NHibernate provides constructs for dealing with this. For example, a many-to-many association mapping hides the intermediate association table from the application, so you don t end up with an unwanted entity in your domain model. Similarly, a collection of value-typed strings behaves like a value type from the point of view of the .NET domain model even though it s mapped to its own table in the database. These features have their uses and can often simplify your C# code. But over time, we ve become suspicious of them; these hidden entities often end up needing exposure in applications as business requirements evolve. The many-to-many association table, for example, often has columns added as the application matures, so the relationship itself becomes an entity. You may not go far wrong if you make every database-level entity be exposed to the application as an entity class. For example, we d be inclined to model the many-to-many association as two one-to-many associations to an intervening entity class. We ll leave the final decision to you and return to the topic of many-to-many entity associations later in this chapter. qr code reader webcam c# Best 20 NuGet qr Packages - NuGet Must Haves Package
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Try using AForge.NET library for capturing the video from your webcam , and then ZXing.Net library for reading the QR codes . You can follow ... So far, we ve discussed the differences between value types and entities as seen from the object-oriented and relational-database perspectives. You know that mapping entities is straightforward entity classes are always mapped to database tables using <class>, <subclass>, and <joined-subclass> mapping elements. Value types need something more, which is where mapping types enter the picture. Consider this mapping of the CaveatEmptor User and email address: If Not IsPostBack Then 'Use the GetParameters() method to retrieve the parameters 'for the specified report. Dim parameters As ReportParameterInfoCollection = ReportViewer1.ServerReport.GetParameters() Dim i As Integer For i = 0 To parameters.Count - 1 'Check each parameter to see if Available Values have been defined 'Available Values are stored in the ValidValues property of the parameter object If Not (parameters(i).ValidValues Is Nothing) Then 'Assign the parameters to a ListBox control Select Case parameters(i).Name Case "Year" SetParameterValuesList(YearListBox, parameters(i)) word ean 13 font, upc-a word font, birt code 39, birt ean 13, birt pdf 417, microsoft word qr code font qr code reader windows phone 8.1 c# C# QR Code Reader SDK to read, scan QR Code in C#.NET class ...
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Sep 23, 2016 · I'm not recommending but i've used Zxing Library for Barcode/QR code scanning and that ... create a barcode reader instance IBarcodeReader reader = new ... In ORM, you have to worry about both .NET types and SQL data types. In this example, imagine that the Email field is a .NET string, and the EMAIL column is a SQL varchar. You want to tell NHibernate know how to carry out this conversion, which is where NHibernate mapping types come in. In this case, you specified the mapping type "String", which is appropriate for this particular conversion. The String mapping type isn t the only one built into NHibernate; NHibernate comes with various mapping types that define default persistence strategies for primitive .NET types and certain classes, such as DateTime. read qr code web camera c# C#: Barcode Scanning with Windows Phone 8 - NIEMatron
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C# QR Code Reader SDK Integration. Online tutorial for reading & scanning QR Code barcode images using C#.NET class. Download .NET Barcode Reader ... Built-in mapping types NHibernate s built-in mapping types usually reflect the name of the .NET type they map. Sometimes you ll have a choice of mapping types available to map a particular .NET type to the database. But the built-in mapping types aren t designed to perform arbitrary conversions, such as mapping a VARCHAR field value to a .NET Int32 property value. If you want this kind of functionality, you have to define your own custom value types. We get to that topic a little later in this chapter. We now discuss the basic types date and time, objects, large objects, and various other built-in mapping types and show you what .NET and System.Data.DbType data types they handle. DbTypes are used to infer the data-provider types (hence SQL data types). The basic mapping types in table 6.1 map .NET primitive types to appropriate DbTypes. You ve probably noticed that your database doesn t support some of the DbTypes listed in table 6.1. But ADO.NET provides a partial abstraction of vendor-specific SQL 18: System.Int16 System.Int32 System.Int64 System.Single System.Double System.Decimal System.Byte System.Char System.Char System.Boolean System.Guid System.Enum (an enumeration) DbType.Int16 DbType.Int32 DbType.Int64 DbType.Single DbType.Double DbType.Decimal DbType.Byte DbType.StringFixedLength Case "Month" SetParameterValuesList(MonthListBox, parameters(i)) Case "Category" SetParameterValuesList(CategoryListBox, parameters(i)) End Select End If Next End If 'Process and render the report ReportViewer1.ServerReport.Refresh() DbType.Boolean DbType.Guid DbType for the underlying value DbType.AnsiStringFixedLength either 'T' or 'F' DbType.AnsiStringFixedLength either 'Y' or 'N' data types, allowing NHibernate to work with ANSI-standard types when executing Data Manipulation Language (DML). For database-specific DDL generation, NHibernate translates from the ANSI-standard type to an appropriate vendor-specific type, using the built-in support for specific SQL dialects. (You usually don t have to worry about SQL data types if you re using NHibernate for data access and data schema definition.) NHibernate supports a number of mapping types coming from Hibernate for compatibility (useful for those coming over from Hibernate or using Hibernate tools to generate hbm.xml files). Table 6.2 lists the additional names of NHibernate mapping types. Again, to keep things simple, the assignment of parameters to ListBox controls is hardcoded using the SetParameterValuesList method that you will add in the next step. You can change this code to dynamically generate one control per parameter to make it more flexible. 9. Copy the contents of the SetParameterValuesListVB.txt file in the C:\Documents and Settings\<username>\My Documents\Microsoft Press\rs2005sbs\chap18 folder below the Page_Load() method to add the following code: Table 6.2 Additional names of NHibernate mapping types Additional name Mapping type Additional name From this table, you can see that writing type="integer" or type="int" is identical to type="Int32". Note that this table contains many mapping types that will be discussed in the following sections. qr code reader c# open source qr code reader windows phone 8.1 c#: .NET Table 10.5 ...
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