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Yes, you can use Touchless SDK[^] for webcam and ZXing.NET[^] for QR code. They are both free and open-source. You can also read the article 'WinForm Barcode Reader with Webcam and C#[^]' to learn how to implement a simple QR code reader using Touchless and a .NET barcode SDK.

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Your custom data processing extension also needs a class to create a command object that sends a request to the data source. This command object can include parameters passed from Reporting Services. The command is executed against the data source and the results are returned as a data reader object. In this class, you must implement the IDbCommand interface. This interface is responsible for managing the properties of a command, such as the command text and time-out value for the command execution. It is also used to create a parameter object or to cancel command execution. The code in the ExecuteReader() method is specific to your implementation and is the only method that you have to update for your extension. This method is used to execute the command and put the results into a new data reader object. There are several references to other classes that you might need to update in this class. The m_parameters variable and the Parameters property both reference the parameters collection class. The Transaction property references the transaction class and the CreateParameter() method references the parameter class. You can optionally implement the IDbCommandAnalysis interface if you want to include a prompt for parameters when previewing a report with your custom data processing extension in Report Designer. However, it isn t necessary if your extension doesn t support parameters. In this procedure, you ll review the code for the ExecuteReader() method. Review the XMLCommand class 1. In Solution Explorer, open the XMLCommand file to review the program code. 2. Find the ExecuteReader() method toward the bottom of the file. The code for ExecuteReader() method looks like this:

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QRCoder is a simple library, written in C#.NET, which enables ... ZXing. Ding.​QRCode.ZXing是基于.net core平台开发的应用框架中的ZXing.Net二维码操作类库。

select CREDIT_CARD_ID, OWNER, NUMBER, CREATED, TYPE, ... from CREDIT_CARD where CREATED = select BANK_ACCOUNT_ID, OWNER, NUMBER, CREATED, BANK_NAME, ... from BANK_ACCOUNT where CREATED =

Notice that a separate query is needed for each concrete subclass: On the other hand, queries against the concrete classes are trivial and perform well:

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Note that here, and in other places in this book, we show SQL that is conceptually identical to the SQL executed by NHibernate. The actual SQL may look superficially different. A further conceptual problem with this mapping strategy is that several different columns of different tables share the same semantics. This makes schema evolution more complex. For example, a change to a base class property type results in changes to multiple columns. It also makes it much more difficult to implement databaseintegrity constraints that apply to all subclasses. This mapping strategy doesn t require any special NHibernate mapping declaration: you create a new <class> declaration for each concrete class, specifying a different table attribute for each. We recommend this approach (only) for the top level of your class hierarchy, where polymorphism isn t usually required.

Public Overloads Function ExecuteReader() As IDataReader ' '* ExecuteReader should retrieve results from the data source '* using a valid and open connection,

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Alternatively, an entire class hierarchy can be mapped to a single table. This table includes columns for all properties of all classes in the hierarchy. The concrete subclass represented by a particular row is identified by the value of a type discriminator column. This approach is shown in figure 3.10. This mapping strategy is a winner in terms of both performance and simplicity. It s the best-performing way to represent polymorphism both polymorphic and nonpolymorphic queries perform well and it s easy to implement by hand. Ad hoc reporting is possible without complex joins or unions, and schema evolution is straightforward. There is one major problem: columns for properties declared by subclasses must be declared to be nullable. If your subclasses each define several non-nullable properties, the loss of NOT NULL constraints can be a serious problem from the point of view of data integrity.

BILLING_DETAILS_ID <<PK>> BILLING_DETAILS_TYPE <<Discriminator>> OWNER NUMBER CREATED CREDIT_CARD_TYPE CREDIT_CARD_EXP_MONTH CREDIT_CARD_EXP_YEAR BANK_ACCOUNT_BANK_NAME BANK_ACCOUNT_BANK_SWIFT

In NHibernate, you use the <subclass> element to indicate a table-per-class hierarchy mapping, as in listing 3.8.

16:

Listing 3.8 NHibernate <subclass> mapping Root class, <hibernate-mapping> mapped to table <class name="BillingDetails" table="BILLING_DETAILS" discriminator-value="BD"> <id name="Id" column="BILLING_DETAILS_ID" type="Int64"> <generator class="native"/> Discriminator </id> column <discriminator column="BILLING_DETAILS_TYPE" type="String"/> <property Property name="Name" mappings column="OWNER" type="String"/> ... <subclass CreditCard name="CreditCard" subclass discriminator-value="CC"> <property name="Type" column="CREDIT_CARD_TYPE"/> ... </subclass> ... </class> </hibernate-mapping>

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