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pstmt = conn.prepareStatement( queryStmt ); rset = pstmt.executeQuery(); while( rset.next() ) { int value = rset.getInt( 1 ); The call to wasNull() returns a boolean value indicating whether or not the getInt() method just executed was null: if( rset.wasNull() ) { System.out.println( "got a null value..." ); } System.out.println( "The value is retrieved as " + value ); } } finally { // release the JDBC resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } } } // end of program On running the program, we get the following output: B:\>java DemoNullValues URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp) (PORT=1521)(HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) Inserted 1 rows with null value got a null value... The value is retrieved as 0 Next, we ll look at the ability to prefetch values retrieved from the database and its impact on query performance. vb.net code 39 reader VB . NET Image: Example to Read Code 39 Barcode with VB . NET Codes in ...
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Free to download .NET, C#, VB . NET barcode reader app for Code 39 ; C# Code 39 recognition SDK; VB . NET Code 39 recognition SDK. You have already seen assignments on several occasions in this chapter; they consist of an assignment operator and two operands, with the left side being assigned to and the right assigned from. Typically the first operand is a variable and the right one is an expression. The fourth statement of the preceding code snippet is an example of an assignment. word 2013 code 39, ean 128 word font, word aflame upci, birt pdf 417, qr code birt free, word dokument als qr code vb.net code 39 reader read code 39 barcode with vb . net - Stack Overflow
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NET Code 39 Barcode Reader , Reading Code - 39 barcode images in .NET, C#, VB . NET , ASP.NET applications. JDBC 2.0 allows you to specify for a query the number of rows retrieved at a time with each database round-trip. This number is known as the fetch size, and the process of getting rows in advance is called prefetching. The default value of a fetch size in Oracle JDBC is 10. This means that by default, when you execute a query, the JDBC driver retrieves ten rows at a time per round-trip. By changing this number, you can control the number of round-trips your queries make to the database. For example, with the default fetch size value of 10, a query resulting in a total of 100 rows would actually make 11 round-trips (the eleventh round-trip is required to detect that the query has no more rows to return). But if you use a fetch size of, say, 50, the query would make only three round-trips to fetch 100 rows. Branching or conditional statements in X++ are as follows: if: Evaluates an expression and executes a single or compound statement depending on the logical result of the expression i.e., it executes it if the expression is true, and doesn t if it s false. It looks like this: Yet good object-oriented design dictates that all business logic should be encapsulated within objects rather than spread across the application This can be challenging when an object needs to both interact with the user and perform back-end processing Effectively, the object needs to be on the client sometimes and on the application server other times The idea of mobile objects solves this problem by allowing an object to physically move from one machine to another This means it really is possible to have an object run on the client to interact with the user, then move to the application server to do back-end work like interacting with the database A key goal of the data portal is to enable the concept of mobile objects. To access data by forming object views on top of existing relational schema: Object views are views built on top of relational tables, such that the data in the view is accessed as if the underlying tables were defined as tables with object type columns. When you use object views, you can potentially get the best of both worlds: You can use queries against object views to retrieve data as objects directly, while retaining the flexibility of using SQL directly on the underlying relational tables when required. Toward the end of this chapter, we ll compare relational tables, tables containing object types as columns, and object views when used to store data. We ll compare these three techniques in terms of performance and code maintainability. This chapter begins with a brief introduction to Oracle objects and collections in the next section. vb.net code 39 reader Visual Studio . NET Barcode Scanner Library API for . NET Barcode ...
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