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In an object model, associations represent the relationships between objects. For instance, a bid has a relationship with an item. This association is created using object references. In the relational world, an association is represented by a foreign key column, with copies of key values in several tables. There are subtle differences between the two representations. Object references are inherently directional: the association is from one object to the other. If an association between objects should be navigable in both directions, you must define the association twice, once in each of the associated classes. On the other hand, foreign-key associations aren t by nature directional. Navigation has no meaning for a relational data model, because you can create arbitrary data associations with table joins and projection. We discuss association mappings in detail in chapters 3 and 6. If you think about the DataSet in all these problems, you ll realize how rigid its structure is. The information in a DataSet is presented exactly as in the database. To navigate from one row to another, you must manually resolve their relationship by using a foreign key to find the referred row in the related table. Let s move from the representation of the entities to how you can manipulate them efficiently. c# ean 13 reader .NET EAN-13 Barcode Reader for C#, VB.NET, ASP.NET Applications
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MessagingToolkit Barcode library is a C# barcode library that can be used in * WinForms ... With the Barcode Reader SDK, you can decode barcodes from. When users work on applications, they perform distinct unitary operations. These operations can be referred to as conversations (or business transactions or application An XML file used to describe the structures and relationships in a data source and to define logical tables, columns, or relationships that do not exist in the data source. The data source view is used as a source object for generating a report model. birt data matrix, print ean 13 barcode word, word 2010 code 39 barcode, birt pdf 417, word pdf 417, data matrix word 2010 c# ean 13 reader C# Imaging - Decode 1D EAN-13 in C#.NET - RasterEdge.com
Besides EAN-13 barcode, this C#.NET barcode reader & scanner control is also able to read & decode other UPC/EAN barcodes from documents (PDF, Word, ... c# ean 13 reader The C# Barcode and QR Library | Iron Barcode - Iron Software
The C# Barcode Library. Read and Write QR & Barcodes in .Net Applications. Fast & Accurate using Scans and Live Image Processing. Supports . transactions). For example, placing a bid on an item is a conversation. Seasoned programmers know how hard it can be to make sure that many related operations performed by the user are treated as if they were a single bigger business transaction (a unit). You ll learn in this section that NHibernate makes this easier to achieve. Let s take another example to illustrate this concept. Popular media players allow you to rate the songs you hear and later sort them based on your rating. This means your ratings are persisted. When you open a list of songs, you listen and rate them one by one. When should persistence take place The first solution that may come to mind is to persist the rating when the user enters it. This technique is inefficient: the user may change the rating many times, and the persistence will be done separately for each song. (But this approach is safest if you expect the application to crash at any moment.) Instead, you can let the user rate all the songs and then persist the ratings when the user closes the list. The process of rating these songs is a conversation. Let s see how it works and what its benefits are. c# ean 13 reader Creating EAN-13 Barcodes with C# - CodeProject
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C# Updated on Aug 22, 2018 ... iron-software / Iron-Barcode-Reading-Barcodes-In-CSharp · 2. C# Tutorial to read barcodes and QR - see full tutorial at ... The join condition here is the username, presented as an attribute in both classes. If both entities have the same username, they re joined (with an inner join) in the result. The query result consists of ordered pairs: IList results = session.CreateQuery( @"from User user, LogRecord log where user.Username = log.Username" ) .List(); foreach( Object[] pair in results ) User user = (User) pair[0]; LogRecord log = (LogRecord) pair[1]; } expression language used with Analysis Services to model database objects and to retrieve values from an Analysis Services cube. You can change the result by adding a select clause. You probably won t need to use theta-style joins often. Note that the ICriteria API doesn t provide any means for expressing Cartesian products or theta-style joins. It s also currently not possible in NHibernate to outer-join two tables that don t have a mapped association. It s extremely common to perform queries that compare primary key or foreign key values to either query parameters or other primary or foreign key values. If you think about this in more object-oriented terms, what you re doing is comparing object references. HQL supports the following: from Item i, User u where i.Seller = u and u.Username = 'steve' A subscription that uses a database query to set delivery options. Information used to retrieve data for a report, such as a query and a pointer to the data source, as well as information used when the query executes, such as a time-out value or a query parameter value. In this query, i.Seller refers to the foreign key to the USER table in the ITEM table (on the SELLER_ID column), and User refers to the primary key of the USER table (on the USER_ID column). This next query uses a theta-style join and is equivalent to the much preferred ANSI style: from Item i join i.Seller u where u.Username = 'steve' On the other hand, the following theta-style join can t be re-expressed as a from clause join: definition of a physical table, which is analogous to a derived column in a view defined in a relational database. c# ean 13 reader Read & Decode EAN-13 Barcode Using C# Class Code in .NET ...
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