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WHERE Id=@id AND LastChanged=@lastChanged IF @@ROWCOUNT = 0 RAISERROR('Row has been edited by another user', 16, 1) SELECT @newLastChanged = LastChanged FROM Projects WHERE Id=@id RETURN Again, this procedure only updates the record in the Projects table; the related records in the Assignments table are updated separately. Notice the @lastChanged parameter required by the procedure. This represents the last known timestamp value for the row. In 8, you ll see how this value is maintained by the business object. When the object attempts to update the row, it provides the last known value for the LastChanged column. If that value hasn t changed in the database, then no other user has updated the row since the object read its data. But if the value has changed in the database, then some other user did change the data in the row since the object read the data. First-write-wins optimistic concurrency specifies that this second update can t be allowed, because it could overwrite changes made by that other user. The UPDATE statement itself uses this parameter in the WHERE clause to ensure that the row is only updated if the value matches. The procedure then checks to see if the row was actually updated. If no rows were updated, it raises an error, which shows up as a database exception in the data access code of the business object. On the other hand, if the update goes through and the row is changed, then a SELECT statement is executed to return the new value of the LastChanged column as an output parameter, so that the object can maintain the new value to allow possible future updates. vb.net ean 128 reader Packages matching GS1-128 - NuGet Gallery
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VB . NET GS1-128 Generator for .NET class, Data Matrix, PDF417, QRCode, Code128, Code39. The Ref interface is implemented (partially, as you will soon discover) and extended by the Oracle class oracle.sql.REF. The Ref interface consists of the following methods. The following method gets the fully qualified base SQL name of the object type to which the reference points (e.g., BENCHMARK.EMP_REF_TYPE): public String getBaseTypeName() throws SQLException; The following method retrieves the SQL object type referenced by this Ref object: public String getObject() throws SQLException; If the connection s type map has an entry for the structured type, the instance will be custommapped to the Java class indicated in the type map. Otherwise, the structured type instance will be mapped to a Struct object. As you will see, this method does not work for Oracle 10g Release 1 or Oracle9i Release 2. Instead, you have to use the Oracle proprietary method get Value(), which is available in the REF class that extends the Ref interface. The following method retrieves the referenced object and maps it to a Java type based on the supplied type map: public String getObject( Map typeMap ) throws SQLException; The following method sets the value pointed to by this Ref object to the supplied object: public String setObject( Object refObject ) throws SQLException; The REF class in the oracle.sql package implements the Ref interface partially and adds many proprietary methods. Some of the more commonly used methods are public String getValue() throws SQLException; public String getValue( Map typeMap ) throws SQLException; As mentioned in the Ref section, the method getObject() in Oracle does not work as yet; it gives the unsupported feature exception. Instead, you need to use the REF counterpart getValue() or its overloaded version, which provides the same functionality. In the next section, we provide an example of how to query and update Ref objects. vb.net gs1 128 GS1 128 Generator DLL in VB | Free . NET program sample code ...
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I suggest you use Google as there is a lot of information on the topic: http://en. lmgtfy.com/?q=ucc+ ean - 128 +barcode+generator[^]. —SA. The deleteProject procedure deletes the appropriate record from the Projects table, and also removes any related records from the Assignments table. When creating the relationships between tables in the database diagram, the default is to not automatically cascade deletions to child tables. CREATE PROCEDURE deleteProject ( @id uniqueidentifier ) AS DELETE Assignments WHERE ProjectId=@id DELETE Projects WHERE Id=@id RETURN If you set up your table relationships to cascade deletes automatically, then obviously the preceding stored procedure would only delete the data in the Projects table. Though this procedure updates multiple tables, it does not include transactional code. Although you could manage the transaction at this level, you can gain flexibility by allowing the business object to manage the transaction. Using the CSLA .NET framework, you have the option to run the data access code within a System.Transactions transactional context, to run it within an Enterprise Services distributed transaction, or to manually manage the transaction. When using either System.Transactions or Enterprise Services, transactional statements in the stored procedures will cause exceptions to occur. If you opt to handle the transactions manually, you can choose to put the transactional vb.net gs1 128 Create GS1 - 128 Bar Codes with VB . NET - RasterEdge.com
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