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After getting the connection, we prepare and execute a statement that selects just the nested table column emp_address_list of the table emp_table: String stmtString = "select emp_address_list from emp_table"; pstmt = conn.prepareStatement( stmtString ); // Step 2 - execute the statement and get the result set rset = pstmt.executeQuery(); while( rset.next() ) { Inside the while loop of the ResultSet interface, we get the array using the getArray() method. You can use any of the methods getArray(), getOracleArray(), or getResultSet() to retrieve individual elements as discussed in the section Retrieving a Collection of Varchar2 Elements earlier. We will demonstrate the methods getArray() and getResultSet() in the definition of the methods _doUseGetArray() and doUseResultSet() invoked here: Array array = rset.getArray(1); _doUseGetArray( array ); _doUseResultSet( array ); } } finally { // release JDBC JDBCUtil.close( JDBCUtil.close( JDBCUtil.close( } } The following code defines the method _doUseGetArray(). It uses the method getArray() to retrieve an array of objects. Then it loops through each element of the array, casting it as a Struct object and printing its attributes using the getAttributes() method of the Struct interface that we covered in 9. private static void _doUseGetArray( Array array ) throws SQLException { System.out.println("In _doUseGetArray");System.out.flush(); Object[] arrayInJava = (Object[])array.getArray(); for( int i=0; i < arrayInJava.length; i++ ) { Struct empStruct = (Struct) (arrayInJava[i]); Object[] attributes = empStruct.getAttributes(); for( int j=0; j < attributes.length; j++ ) { System.out.println(attributes[j]); } System.out.println();

resources rset); pstmt); conn );

days=100 are also passed onto the PH.aspx page, which results in the price history chart you saw earlier in Figure 10-11 and Figure 10-12.

} System.out.println("Exiting _doUseGetArray");System.out.flush(); } The method _doUseResultSet(), defined as follows, uses the method getResultSet() to retrieve a ResultSet that contains array elements. It then loops through each element of the ResultSet interface, retrieving the Struct object and then printing out each attribute of these objects. private static void _doUseResultSet( Array array ) throws SQLException { System.out.println("In _doUseResultSet"); ResultSet rset = null; try { rset = array.getResultSet(); while( rset.next() ) { int index = rset.getInt( 1 ); Struct empStruct = (Struct) rset.getObject( 2 ); Object[] attributes = empStruct.getAttributes(); for( int j=0; j < attributes.length; j++ ) { System.out.println(attributes[j]); } System.out.println(); } } finally { JDBCUtil.close( rset); } System.out.println("Exiting _doUseResultSet"); } }

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In 10, you learned how to generate custom classes for object types using the JPublisher utility. In this section, we ll examine how to use the same technique to materialize the array member objects as custom class objects. The custom classes offer you the following advantages over the weakly typed alternative (Struct class) discussed in the previous section: They are strongly typed, meaning that many errors are checked at compilation time instead of at runtime (e.g., if you try to pass an array of persons as an array of addresses). This is possible because each collection is converted into its own custom Java class.

A methodology for determining good buy and sell prices for a stock comes from a technical analysis of the stock s trading envelope through the use of Bollinger bands. These bands are based on a calculation of the moving average of the stock the moving average being the average price of the stock over a number of periods preceding the current one. For example, a 30-day moving average on any day is the average of closing prices for the stock over the previous 30-day period. Thus, today s average is slightly different from yesterday s, which is slightly different from the day before; hence, it s called a moving average. Bollinger bands are calculated from this value. The upper band is the average over the preceding period plus two times the standard deviation. The lower band is the average over the preceding period minus two times the standard deviation. Figure 10-15 and Figure 10-16 show the price history overlaid with Bollinger bands for MSFT and SBUX.

Custom collection classes (produced by JPublisher) allow you to get and set individual elements using the getElement() and setElement() methods. Recall that the ARRAY class does not provide you with any setter methods for setting an array element. A custom class must satisfy the following requirements: It must implement the oracle.sql.ORAData and oracle.sql.ORADataFactory interfaces, which we covered in 10. It must provide a means of storing the collection data (e.g., in a member ARRAY object). We will use JPublisher to generate these classes for the object type emp_type and our varray, emp_type_varray. Please refer to 10 for details on how to use the JPublisher utility. We use the following properties file (called prop.txt) for our JPublisher run: jpub.user=benchmark/benchmark jpub.methods=all jpub.builtintypes=jdbc jpub.numbertypes=objectjdbc jpub.usertypes=oracle jpub.package=book.ch11.jpub jpub.input=input.txt

The file input.txt referred to in the property jpub.input contains the following lines: SQL ADDRESS AS Address SQL NESTED_TABLE_OF_ADDRESSES AS AddressList As you can see, we plan to generate a class Address for our object type address and a class AddressList for our varray emp_table.

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