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A Java exception is an object that describes an exceptional (that is, error) condition that has occurred in a piece of code When an exceptional condition arises, an object representing that exception is created and thrown in the method that caused the error That method may choose to handle the exception itself, or pass it on Either way, at some point, the exception is caught and processed Exceptions can be generated by the Java run-time system, or they can be manually generated by your code Exceptions thrown by Java relate to fundamental errors that violate the rules of the Java language or the constraints of the Java execution environment Manually generated exceptions are typically used to report some error condition to the caller of a method Java exception handling is managed via five keywords: try, catch, throw, throws, and finally Briefly, here is how they work Program statements that you want to monitor for exceptions are contained within a try block If an exception occurs within the try block, it is thrown Your code can catch this exception (using catch) and handle it in some rational manner System-generated exceptions are automatically thrown by the Java run-time system To manually throw an exception, use the keyword throw Any exception that is thrown out of a method must be specified as such by a throws clause Any code that absolutely must be executed after a try block completes is put in a finally block This is the general form of an exception-handling block: try { // block of code to monitor for errors } vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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NET EAN - 13 Barcode Reader , Reading EAN - 13 barcode images in .NET, C#, VB . NET , ASP.NET applications. The first() method moves the virtual cursor to the first row in the ResultSet Likewise, the last() method positions the virtual cursor at the last row in the ResultSet The previous() method moves the virtual cursor to the previous row The absolute() method positions the virtual cursor at the row number specified by the integer passed as a parameter to the absolute() method The relative() method moves the virtual cursor the specified number of rows contained in the parameter The parameter is a positive or negative integer, where the sign represents the direction the virtual cursor is moved For example, a 4 moves the virtual cursor back four rows from the current row Likewise, a 5 moves the virtual cursor forward five rows from the current row And the getRow() method returns an integer that represents the number of the current row in the ResultSet The Statement object that is created using the createStatement() of the Connection object must be set up to handle a scrollable ResultSet by passing the createStatement() method one of three constants These constants are TYPE_FORWARD_ONLY, TYPE_SCROLL_INSENSITIVE, and TYPE_SCROLL_SENSITIVE The TYPE_FORWARD_ONLY constant restricts the virtual cursor to downward movement, which is the default setting TYPE_SCROLL_INSENSITIVE and TYPE_ SCROLL_SENSITIVE constants permit the virtual cursor to move in both directions TYPE_SCROLL_INSENSITIVE makes the ResultSet insensitive to data changes made by another J2ME application in the table whose rows are reflected in the ResultSet The TYPE_SCROLL_SENSITIVE constant makes the ResultSet sensitive to those changes Listing 10-14 illustrates how to reposition the virtual cursor in the ResultSet This listing, which is a modification of the previous code segments used as examples in this chapter, retrieves customers first names and last names from the Customers table of the CustomerInformation database Since Listing 10-14 moves the virtual cursor in multiple directions, the TYPE_SCROLL_INSENSITIVE constant is passed to the createStatement() This enables the use of virtual cursor control methods in the third try {} block Initially, the virtual cursor moves to the first row of the ResultSet and then to the last row before being positioned at the second to last row of the ResultSet Next, the virtual cursor is positioned in the tenth row of the ResultSet using the absolute() method Finally, the relative() method is called twice The first time the relative() method is called, the virtual cursor is moved back two rows from the current row, which places the virtual cursor at row eight The relative( ) method is again called to return the virtual cursor back to its original row by moving the virtual cursor two rows forward If you use any of these methods and end up positioning the cursor before the first record or beyond the last record, there won t be any errors thrown. vb.net ean 13 reader EAN - 13 VB . NET DLL - KeepAutomation.com
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