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CHAPTER 10 USING STRONGLY TYPED INTERFACES WITH JPUBLISHER
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String address = (String) cstmt.getObject( 1 ); return address; } finally { JDBCUtil.close ( cstmt ); } } Note the following: We need to import the classes book.util.JDBCUtil and java.sql.CallableStatement for the MyAddress class after adding the previous method, in order to compile the file MyAddress.java. We pass a Connection object in the wrapper method getAddress(). This is required to execute the object s get_address() method after connecting to the database. In the statement String of our CallableStatement, we have a parameter being passed to the method get_address() method of the address object type, whereas we did not have any parameters in the actual method get_address(), as shown in its signature reproduced below: map member function get_address return varchar2; This extra parameter is used to tell the database the object instance whose get_address() method needs to be invoked. It turns out that Oracle invokes the object methods with an implicit parameter, self (which, if you remember, is the equivalent of the Java keyword this). This implies that when we invoke the method get_address(), Oracle implicitly passes the parameter self to the method, thus invoking the current object s method. In our Java method getAddress(), we bind this additional parameter explicitly with the this value (shown in bold font in the preceding definition of the method). The conversion of the this parameter of the MyAddress Java object to the self parameter of the database object type address is done automatically by the JDBC driver based on the type map information that we set up, as explained in the next section.
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Using a Type Map to Map Object Types to Java Classes
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Now that we have a JPublisher-generated class for the object type in the database, we need to tell the JDBC driver which object type maps to which Java class. We provide this information to the driver by adding a type map to the Connection object. The type map for a connection is an object that implements the java.util.Map interface (similar to how java.util.HashMap does). It contains a key/value pair, with the database object name as the key and the class object of the corresponding custom class as the value. To add to the type map the mapping between the object type and the custom class, we need to first get the existing map, if any, from the Connection object using the following method of the Connection object: public Map getTypeMap() throws SQLException
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CHAPTER 10 USING STRONGLY TYPED INTERFACES WITH JPUBLISHER
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This method retrieves the Map object associated with a Connection object. Unless the application has added an entry, the type map returned will be empty. An example illustrating invocation of this method is Map map = connection.getTypeMap(); Next, we need to add the entries to the Connection object s Map object. In this example, we map the Java class instance of the class MyAddress to the database object type address as follows: myMap.put ( "BENCHMARK.ADDRESS", Class.forName( MyAddress.class.getName() ) ); We can set a Map object (containing the requisite mapping entries) on the Connection object by using the following method: public void setTypeMap( Map typeMap) throws SQLException For example, we can execute the following code: connection.setType ( myMap );
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In this section, we ll go through the steps of selecting, inserting, updating, or deleting objects using the custom classes generated in the previous section. The class DemoSQLData illustrates these steps for us and is explained in comments interspersed within the code: /** This program demonstrates how to use the Java class * MyAddress that maps to the address object type and uses * the JDBC standard interface SQLData. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0. and */ import java.util.Map; import java.sql.SQLException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import book.util.JDBCUtil; import book.ch10.jpub.MyAddress; public class DemoSQLData { public static void main(String[] args) throws Exception { Connection connection = null; try { connection = JDBCUtil.getConnection( "benchmark", "benchmark", "ora10g" );
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