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As discussed previously in this chapter, a primary key is a data element that uniquely identifies a row of data elements within a group The data selected to become the primary key may or may not exist in the data list generated as the result of analyzing entities Sometimes a data element, such as an order number, is used as the primary key Other times, the DBMS can be requested to automatically generate a primary key whenever a column in the group isn t suitable to be designated the primary key Figure 9-8 indicates the primary key of each group with an asterisk Let s use a customer entity as an illustration In the purest sense, a customer has a name and address as attributes These attributes decompose to first name, last name, vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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16 Sep 2008 ... Demonstrates creating EAN - 13 Barcodes with VB . NET . ... programs for hand held devices which came with an integrated barcode reader . is a valid overload of vaTest( ) in the foregoing program This version is invoked only when one int argument is present When two or more int arguments are passed, the varargs version vaTest(int v) is used Somewhat unexpected errors can result when overloading a method that takes a variable-length argument These errors involve ambiguity because it is possible to create an ambiguous call to an overloaded varargs method For example, consider the following program: online presence for the company and to showcase that company s products You can use cascading style sheets to format an entire Web site There are two main types of style sheets: internal and external External style sheets make it easy to change a site s formatting 9: birt upc-a, birt ean 13, birt pdf 417, birt qr code, birt ean 128, birt code 128 vb.net ean 13 reader Read Barcodes from Images C#/ VB . NET - BC.NetBarcodeReader ...
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NET EAN - 13 Barcode Reader , Reading EAN - 13 barcode images in .NET, C#, VB . NET , ASP.NET applications. // Varargs, overloading, and ambiguity // // This program contains an error and will // not compile! class VarArgs4 { static void vaTest(int v) { Systemoutprint("vaTest(int ): " + "Number of args: " + vlength + " Contents: "); for(int x : v) Systemoutprint(x + " "); Systemoutprintln(); } Part I: feedback form, 342 text area, 342 radio button, 344 check box, 344 Figure 9-8 static void vaTest(boolean v) { Systemoutprint("vaTest(boolean ) " + "Number of args: " + vlength + " Contents: "); for(boolean x : v) Systemoutprint(x + " "); Systemoutprintln(); } information about their visitors A privacy policy describes the information the site gathers and the way the site owner will use it Security is the protection of data from unauthorized access, both on the Web server and during transmission over the Web Data encryption alters the appearance of information before transmission so that only the intended receiver with the proper decryption program can restore it to readable form Digital certificates confirm the validity of online businesses public static void main(String args[]) { vaTest(1, 2, 3); // OK vaTest(true, false, false); // OK vaTest(); // Error: Ambiguous! } } vb.net ean 13 reader EAN - 13 VB . NET DLL - KeepAutomation.com
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NET. Free demo download. How to read, scan EAN - 13 linear barcode image in . NET applications ... High-quality barcode reader ; C#, VB . NET sample code ... street, city, state, and zip code However, none of these data elements are suited to become a primary key because individually and collectively none uniquely identify a customer Intuitively, the customer first name and last name seem to uniquely identify a customer, but upon closer analysis you ll see that more than one customer might have the same first name and last name Likewise, two people at the same address might have the same name, although it s somewhat unlikely If neither a single data element nor a combination of data elements uniquely identify a row, then you must create another data element to serve as the primary key of the table, which is what is required in the previous example Alternatively, you can request the DBMS to generate a primary key automatically In this program, the overloading of vaTest( ) is perfectly correct However, this program will not compile because of the following call: accessibility, 353 accessibility standards, 353 alternative text, 354 vaTest(); // Error: Ambiguous! Nearly all commercial DBMSs can generate primary keys to make the database thread safe and reliable In contrast, a J2ME application that generates a key must contain the logic to be sure that none of the components running on different servers accidentally generate the same key Because the vararg parameter can be empty, this call could be translated into a call to vaTest(int ) or vaTest(boolean ) Both are equally valid Thus, the call is inherently ambiguous Here is another example of ambiguity The following overloaded versions of vaTest( ) are inherently ambiguous even though one takes a normal parameter: from visitors Feedback forms enable visitors to communicate comments, questions, and suggestions to the site owner Forms provide various ways for visitors to respond, including text areas, text boxes, radio buttons, and check boxes Radio buttons allow visitors to choose only one of the options listed Check boxes allow visitors to select as many choices from the list as they desire static void vaTest(int v) { // static void vaTest(int n, int v) { // vb.net ean 13 reader VB . NET Image: VB Code to Read and Recognize EAN - 13 Barcode from ...
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