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You ll use advanced query techniques less frequently with NHibernate, but it will be helpful to know about them. In this section, we discuss programmatically building criteria with example objects, a topic we briefly introduced earlier. Filtering collections is also a handy technique: you can use the database instead of filtering objects in memory. Subqueries and queries in native SQL will round out your knowledge of NHibernate query techniques. 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. It s common for queries to be built programmatically by combining several optional query criteria depending on user input. For example, a system administrator may wish to search for users by any combination of first name or last name, and to retrieve the result ordered by username. Using HQL, you can build the query using string manipulations: Part I: word 2010 qr code generator, eclipse birt qr code, birt pdf 417, free upc barcode font for word, birt ean 13, word 2010 code 39 font c# ean 13 reader C# Imaging - Decode 1D EAN-13 in C#.NET - RasterEdge.com
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The C# Barcode Library. Read and Write QR & Barcodes in .Net Applications. Fast & Accurate using Scans and Live Image Processing. Supports . public IList<User> FindUsers(string firstname, string lastname) { StringBuilder queryString = new StringBuilder(); bool conditionFound = false; if (firstname != null) { queryString.Append("lower(u.Firstname) like :firstname "); conditionFound=true; } if (lastname != null) { if (conditionFound) queryString.Append("and "); queryString.Append("lower(u.Lastname) like :lastname "); conditionFound=true; } string fromClause = conditionFound "from User u where " : "from User u "; queryString.Insert(0, fromClause).Append("order by u.username"); IQuery query = GetSession().CreateQuery( queryString.ToString() ); if (firstname != null) query.SetString( "firstname", '%' + firstname.ToLower() + '%' ); if (lastname != null) query.SetString( "lastname", '%' + lastname.ToLower() + '%' ); return query.List<User>(); } This code is tedious and noisy, so let s try a different approach. The ICriteria API looks promising: public IList<User> FindUsers(string firstname, string lastname) { ICriteria crit = GetSession().CreateCriteria(typeof(User)); if (firstname != null) { crit.Add( Expression.InsensitiveLike("Firstname", firstname, MatchMode.Anywhere) ); The folder contents are displayed: } if (lastname != null) { crit.Add( Expression.InsensitiveLike("Lastname", lastname, MatchMode.Anywhere) ); } crit.AddOrder( Order.Asc("Username") ); return crit.List<User>(); } 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 ... This code is much shorter and more readable. Note that the InsensitiveLike() operator performs a case-insensitive match. There seems no doubt that this is a better approach. But for search screens with many optional search criteria, there is an even better way. First, observe that as you add new search criteria, the parameter list of FindUsers() grows. It would be better to capture the searchable properties as an object. Because all the search properties belong to the User class, why not use an instance of User QBE (Query by Example) uses this idea; you provide an instance of the queried class with some properties initialized, and the query returns all persistent instances with matching property values. NHibernate implements QBE as part of the ICriteria query API: public IList<User> FindUsers(User u) { Example exampleUser = Example.Create(u).IgnoreCase().EnableLike(MatchMode.Anywhere); return GetSession().CreateCriteria(typeof(User)) .Add(exampleUser) .List<User>(); } Notice that this page has a Properties tab in addition to the Contents tab. (You ll learn more about managing folder properties in 9.) Currently, the Adventure Works folder contains only one report, the Sales Summary report that you just published. 4. Click the Sales Summary link. Reporting Services generates and displays the Sales Summary report: The call to Create() returns a new instance of Example for the given instance of User. The IgnoreCase() method puts the example query into a case-insensitive mode for all string-valued properties. The call to EnableLike() specifies that the SQL like operator should be used for all string-valued properties and specifies a MatchMode. You ve significantly simplified the code again. The nicest thing about NHibernate Example queries is that an Example is just an ordinary ICriterion. You can freely mix and match QBE with QBC. Let s see how this works by further restricting the search results to users with unsold Items. For this purpose, you add an ICriteria to the example user, constraining the result using its Items collection of Items: public IList<User> FindUsers(User u) { Example exampleUser = Example.Create(u).IgnoreCase().EnableLike(MatchMode.Anywhere); return GetSession().CreateCriteria(typeof(User)) .Add( exampleUser ) .CreateCriteria("Items") .Add( Expression.IsNull("SuccessfulBid") ) .List<User>(); } 3: Even better, you can combine User properties and Item properties in the same search: public IList<User> FindUsers(User u, Item i) { Example exampleUser = Example.Create(u).IgnoreCase().EnableLike(MatchMode.Anywhere); Example exampleItem = Example.Create(i).IgnoreCase().EnableLike(MatchMode.Anywhere); return GetSession().CreateCriteria(typeof(User)) .Add( exampleUser ) .CreateCriteria("Items") .Add( exampleItem ) .List<User>(); } At this point, we invite you to step back and consider how much code would be required to implement this search screen using hand-coded SQL/ADO.NET. It s a lot: if we listed it here, it would stretch for pages. The View tab is displayed by default when you open a report. Three other tabs are available for this report: Properties, History, and Subscriptions. In this section, you review the Properties page. Later, in 7, you ll learn more about the other tabs. Tip c# ean 13 reader Read & Decode EAN-13 Barcode Using C# Class Code in .NET ...
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