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The RuleMethod class is scoped as internal, as it is used by other classes in the Csla.Validation namespace, but shouldn t be used by code outside the framework. The unique rule name associated with each rule is derived automatically by combining the name of the rule method with the string representation of the RuleArgs object. By default, this is the name of the property with which it is associated: _ruleName = _handler.Method.Name + "!" + _args.ToString(); Because the rule name must be unique, any custom subclasses of RuleArgs should be sure to override ToString() to return a value that includes any custom data that is part of the arguments object. When the business developer associates a rule method with a property, ValidationRules creates a RuleMethod object to maintain all this information. This RuleMethod object is what s actually associated with the property, thus providing all the information needed to invoke the rule when appropriate. In fact, the RuleMethod object handles the invocation of the rule method itself by exposing an Invoke() method: public bool Invoke() { return _handler.Invoke(_target, _args); } When ValidationRules is asked to check the business rules, it merely loops through its list of RuleMethod objects, asking each one to invoke the rule it represents. As you can see, the Invoke() method simply invokes the method via the delegate reference, passing in a reference to the object to be validated (the business object) and the RuleArgs object associated with the rule. 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. // ignore any exceptions since we are in the // finally clause. JDBCUtil.close( opstmt ); JDBCUtil.close( oconn ); } } } When we execute the preceding program (after deleting any pre-existing rows from t1), we get the following output: B:\>java DemoOracleUpdateBatching ora10g URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521)(HOST=rmeno n-lap))(CONNECT_DATA=(SID=ora10g))) num of rows inserted: 0 num of rows inserted: 0 num of rows inserted: 3 num of rows inserted: 0 num of rows sent for batch: 1 As expected, the first two inserts were actually queued up and sent along with the third insert, as is evident from the number of rows inserted. The next insert is, however, executed explicitly when we use the sendBatch() method. Now that you re familiar with both types of batching, next we ll cover a caveat regarding mixing interdependent statements in a batch. word data matrix code, ean 128 word 2007, birt code 39, birt pdf 417, birt code 128, birt gs1 128 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. Each 2-tier session in Axapta has at least three connections: Session connection: Primarily for system-management tasks Application connection: For executing business logic Read-only connection: For business logic that does not perform data manipulation Beyond this, you can create your own user connections in X++ by using the classes Connection, UserConnection, and OdbcConnection. The Connection class provides a handle into the current open connection (which is typically the application connection), which you can then use programmatically. The UserConnection provides a new database connection with the same properties as the application connection but in its own transaction space. The OdbcConnection allows developers to access ODBC data sources. Because logging in to the database is a relatively heavy process, Axapta implements connection pooling in the AOS, which allocates unused but open connections when they are needed if available and opens new ones when it runs out of free open connections. The connection pool mechanism times out connections that are not used after a specified interval, thereby freeing them. Both update batching implementations generally work as expected. There are cases where the results may be surprising to you (especially when you use Oracle update batching). Intuitively, you would expect that changing the batch size should impact only the performance of the application, not the actual data inserted, deleted, and so on. However, this is not the case if you have multiple statements using batching in a loop, and some of these statements can have an impact on the rows manipulated by other statements in the loop. Consider the following class (based on a test case supplied by Tom Kyte), which uses Oracle update batching. It takes a batch size as a command-line parameter and uses Oracle update batching to set the execution batch size on an insert and a delete from the same table t1 that we created in the earlier examples: /* This program illustrates a special case of Oracle update batching where the results are nonintuitive although correct as per the JDBC specification. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0. and 9.2.0.1.0. */ import java.sql.Statement; import java.sql.Connection; import java.sql.PreparedStatement; import oracle.jdbc.OraclePreparedStatement; import book.util.JDBCUtil; You ve already seen how a business rule is defined based on the RuleHandler delegate. A key part of what ValidationRules does is keep a list of such rule methods for each of the business object s properties. vb.net code 39 reader Visual Studio . NET Barcode Scanner Library API for . NET Barcode ...
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