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Let s add another employee by the name of Jack, who works for John, and commit the data: benchmark@ORA10G> insert into emp_table_with_ref 2 select emp_ref_type( 3, 'Jack', ref(e)) 3 from emp_table_with_ref e 4 where emp_no = 2; 1 row created. benchmark@ORA10G> commit; Commit complete. A simple select * on the table emp_table_with_ref shows the following rows: benchmark@ORA10G> select * from emp_table_with_ref; EMP_NO NAME MANAGER ------- ----- ---------------------------------------1 Larry 2 John 0000220208529852ACD8C148BE9BE6A27D01FDA6 5EF5DECA545DC24435820B9DB4F9A2BCD0 3 Jack 00002202089B3B1CBC855A4038B15A4BE9788105 E4F5DECA545DC24435820B9DB4F9A2BCD0 The value shown in the manager column of type emp_ref_type is the object ID of the reference value. The following select shows how to dereference the reference to get the underlying values by using the function deref() on the result of the value() function. The value() function takes as its argument a table alias associated with a row of an object table and returns object instances stored in the object table. The function deref() returns the object reference of its argument, which must return a ref to an object. The following query selects the manager of the employee Jack: benchmark@ORA10G> select value(e).name Name, deref(value(e).manager) Manager 2 from emp_table_with_ref e 3 where e.name = 'Jack'; NAME MANAGER(EMP_NO, NAME, MANAGER) ----- ---------------------------------------Jack EMP_REF_TYPE(2, 'John', 0000220208B40B43 4961904E44AF83AC8FEE99EECEE983C5A859704C F6889D35D3862EDB06) In the next section, we discuss an important issue related to dangling references (references that point to a row that has been deleted) and how to overcome it. vb.net code 39 reader VB . NET Image: Example to Read Code 39 Barcode with VB . NET Codes in ...
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NET Code 39 Barcode Reader , Reading Code - 39 barcode images in .NET, C#, VB . NET , ASP.NET applications. The schema created in the preceding section can result in what are known as dangling references. A dangling reference is a pointer that points to a row that has been deleted. Having dangling references can thus result in data integrity issues with some of the references in your schema pointing to nonexistent rows. For example, we can delete the record corresponding to John, even though the employee under him (Jack) still exists in the table: benchmark@ORA10G> delete from emp_table_with_ref e 2 where e.name = 'John'; 1 row deleted. The following query confirms that the reference in the row corresponding to Jack is now gone: benchmark@ORA10G> select value(e).name Name, deref(value(e).manager) Manager 2 from emp_table_with_ref e 3 where e.name = 'Jack'; NAME MANAGER(EMP_NO, NAME, MANAGER) ----- ---------------------------------------Jack In fact, Oracle provides a way to select dangling references by using the is dangling (or the opposite version, is not dangling) predicate in where clause as follows: benchmark@ORA10G> select value(e).name Name, deref(value(e).manager) Manager 2 from emp_table_with_ref e 3 where e.name = 'Jack' 4 and value(e).manager is not dangling; no rows selected However, the best thing to do if you use references is to create a referential integrity constraint (a foreign key) and avoid dangling references in your application. To illustrate this, we drop the table emp_table_with_ref and re-create it as follows (notice the references clause, shown in bold, that creates the constraint): benchmark@ORA10G> create table emp_table_with_ref of emp_ref_type 2 ( manager references emp_table_with_ref ); Table created. If we now repopulate the table with the same data and try to delete the row corresponding to John, we get the following error: benchmark@ORA10G> delete from emp_table_with_ref e 2 where e.name = 'John'; delete from emp_table_with_ref e * Whenever possible, database access should be performed through stored procedures. Stored procedures offer powerful security control over the database, and perhaps most importantly provide an abstraction layer between the physical structure of database and the logical way in which it is used. The business objects created in 8 will make use of stored procedures for their database interaction. You can use Server Explorer to add the stored procedures to the database by right-clicking the Stored Procedures node under the database, and choosing Add New Stored Procedure. This will bring up a designer window in which you can write the stored procedure code. When you close the designer, the stored procedure will be added to the database. vb.net code 39 reader Visual Studio . NET Barcode Scanner Library API for . NET Barcode ...
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