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For the insert example, we are again going to use Oracle, which allows us to demonstrate how to select a primary key value before, as well as after, an insert operation. If you are using automatically generated values and your database system offers no way to know what the next primary key value is going to be, it certainly will offer a way to retrieve a value that was generated by the previous insert operation. The catch is in the word previous. In a high-contention system, another insert operation may complete and change the previously generated value before you can select it. The result is that even though the rows have been inserted with unique primary keys, your application has two different domain objects with the same value for their primary key. This problem is discussed more extensively in 9. Let s take a look at an ideal scenario: we select the next value from a sequence and attempt an insert operation. It is impossible for two processes to get the same value from a sequence as each select s_customer_id.nextval from dual statement increases the sequence counter. Our insert operation consists of two separate steps: selecting the next value from the sequence and performing the actual insert operation. We also want to modify the property of the domain object that stores the primary key value. This process sounds complicated, but with iBATIS, it is not at all difficult. Listing 10-36 shows how to select a value from the sequence and perform the insert operation. winforms ean 13 reader EAN-13 .NET WinForms DLL - Create EAN-13 barcodes in .NET with
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... symbology developed to be used in a non-retail environment. It can be decoded with virtually any barcode reader. WinForms Barcode control for Ean\UPC ... Listing 10-36. sqlMap File Showing How to Select the Primary Key Values < xml version="1.0" encoding="UTF-8" standalone="no" > <!DOCTYPE sqlMap PUBLIC "-//iBATIS.com//DTD SQL Map 2.0//EN" "http://www.ibatis.com/dtd/sql-map-2.dtd"> <sqlMap> <!-- as previous --> <insert id="insertCustomer" parameterClass="customer"> <selectKey keyProperty="id" resultClass="int"> select s_customer_id.nextval from dual </selectKey> insert into T_Customer (Id, First_Name, Last_Name, Last_Login) values (#id#, #firstName#, #lastName#, #lastLogin#) </insert> </sqlMap> If you look at the <insert> element, you can see that the first step is to select a key from the sequence. After that, you simply use the selected key in the insert operation. The <selectKey> element also sets the domain object s id property to the value of the selected value from the sequence. The Java implementation of the insert(Customer) method is incredibly simple, as you can see in Listing 10-37. Listing 10-37. CustomerDao insert(Customer) iBATIS Implementation public class SqlMapClientCustomerDao extends SqlMapClientDaoSupport implements CustomerDao { private void insert(Customer customer) { getSqlMapClientTemplate().insert("insertCustomer", customer); } // other CustomerDao methods are implemented as stubs } That is all the code you have to write, honest. In Listing 10-38, we modify the source code for the Main class to test that our new object does indeed get inserted. Listing 10-38. Main Class Calling the save(Customer) Method public class Main { private ApplicationContext context; private void run() { // get the context and customerDao Date today = Calendar.getInstance().getTime(); System.out.println("Inserting new Customer record"); Customer customer = new Customer(); customer.setFirstName("Jack"); customer.setLastName("Bower"); customer.setLastLogin(today); CustomerDetail detail = new CustomerDetail(); detail.setId(101L); winforms ean 13 reader Free BarCode API for .NET - CodePlex Archive
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How to read, scan EAN-13 linear barcode image in .NET applications using ... Mature and high-quality barcode reader /scanner for Microsoft . ... NET WinForms customer.setCustomerDetail(detail); customerDao.save(customer); System.out.println("Customer inserted " + customer); } public static void main(String[] args) { new Main().run(); } } Running the application, as the following output shows, proves that we are selecting the next value from the sequence, setting the customer id property to the sequence value, and inserting a row with the selected id primary key: Inserting new Customer record Customer inserted Customer { id: 8, firstName: Jack, lastName: Bower, lastLogin: Wed Oct 17 10:36:31 GMT 2007, detail: CustomerDetail { id: 101, date: null}, gossip: null} Unfortunately, some databases do not support sequences, or do not allow us to obtain the value that is generated for the primary key in an insert operation. The only thing we can do is to get the value generated by the previous insert operation. One such database is MySQL. If we use MySQL, we have to modify the SQL script (as shown in Listing 10-39) as well as the <insert> element in the sqlMap file. Listing 10-39. MySQL Create Script create table Customers ( Id int auto_increment not null, FirstNameName varchar(50) not null, LastNameName varchar(50) not null, LastLogin timestamp not null, constraint PK_CustomerId primary key (Id) ); The only difference is the Id column definition; instead of using sequence data type, we are using int with the auto_increment modifier. This tells MySQL that it should generate a unique value for the primary key if no value is supplied for the column in the insert statement. The sqlMap also needs to be modified to select the generated key after the insert operation (see Listing 10-40). Listing 10-40. sqlMap File for the Customer Domain Object for MySQL < xml version="1.0" encoding="UTF-8" standalone="no" > <!DOCTYPE sqlMap PUBLIC "-//iBATIS.com//DTD SQL Map 2.0//EN" "http://www.ibatis.com/dtd/sql-map-2.dtd"> <sqlMap> <!-- as previous --> <insert id="insertCustomer" parameterClass="test"> insert into Customers (Id, FirstName, LastName, LastLogin) focuses only on which level of activity is needed for example, what input does an activity need, what output does it provide, what are the responsibilities of the activity, and so on. winforms ean 13 reader Best 20 NuGet ean-13 Packages - NuGet Must Haves Package
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