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In this section, we will demonstrate how to modify the collection itself. As part of this demonstration, we will insert a member into our collection. The process of deleting a member or updating a member should involve essentially the same steps: 1. Retrieve the collection as a Java object as explained in the earlier sections. 2. Create a new member element by using an appropriate constructor of the member class. 3. Add the new member to the array. 4. Update the table with the modified collection element. Each of these steps is detailed as part of the method _demoAddingMemberToCollection() presented here: private static void _demoAddingMemberToCollection( Connection conn ) throws SQLException, ClassNotFoundException { The method _addMemberToArray() performs the first three steps, as you will see, as part of its definition. We invoke this method to obtain the modified array that contains the additional address object: AddressList modifiedCollection = _addMemberToArray(conn);

We then prepare and execute an update statement that updates emp_table with the new collection object: String stmtString = "update emp_table e set e.emp_address_list = "; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement( stmtString ); pstmt.setObject( 1, modifiedCollection ); pstmt.execute(); } finally { JDBCUtil.close( pstmt); } } The definition of the method _addMemberToArray() follows: private static AddressList _addMemberToArray( Connection conn ) throws SQLException, ClassNotFoundException { First, we instantiate an Address object in memory: Address newAddress = new Address( "1177 Monica Lane", null, "Cryptic St", "Los Gatos", "CA", "94877"); Next, we retrieve the collection object from the table using the techniques presented earlier: String stmtString = "select emp_address_list " + " from emp_table where empno = "; PreparedStatement pstmt = null; ResultSet rset = null; AddressList addressList = null; try { pstmt = conn.prepareStatement( stmtString ); pstmt.setInt( 1, 1 ); rset = pstmt.executeQuery(); if( rset.next() ) // assume only one row is updated { addressList = (AddressList)((oracle.jdbc.OracleResultSet) rset).getORAData(1, AddressList.getORADataFactory()); Address[] arrayInJava = addressList.getArray();

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At this point, we have an array of Address objects. We simply create a new array with space for one more element, copy the older array to it, and add the new element at the end: Address[] updatedEmpList = new Address[ arrayInJava.length + 1]; System.arraycopy( arrayInJava, 0, updatedEmpList, 0, arrayInJava.length); updatedEmpList[ arrayInJava.length ] = newAddress; for( int i=0; i < updatedEmpList.length; i++ ) { System.out.println(updatedEmpList[i].getLine1()); } We set the internal array of the AddressList object by invoking the method setArray() in it, passing our modified array as the parameter: addressList.setArray( updatedEmpList ); } } finally { JDBCUtil.close( rset); JDBCUtil.close( pstmt); } return addressList; } } // end of program

public double GetStandardDeviation(double[] num) { double Sum = 0.0, SumOfSqrs = 0.0; for (int i = 0; i < num.Length; i++) { Sum += num[i]; SumOfSqrs += Math.Pow(num[i], 2); }

You have already seen one of the performance extensions for numeric element arrays, where you use methods such as getIntArray() to improve performance. There are two more performance extensions in the ARRAY class that you should be aware of, and these are covered in the sections that follow.

The Oracle JDBC driver provides the following methods to enable and disable buffering of ARRAY contents: public void setAutoBuffering(boolean enable); public boolean getAutoBuffering(); The setAutoBuffering() method enables or disables auto-buffering, and the getAuto Buffering() method returns a boolean value indicating whether auto-buffering is enabled or not. By default, auto-buffering is disabled. When you enable auto-buffering, Oracle keeps a local copy of all converted elements. This avoids the data-conversion process for the second and subsequent access of the array elements. This can lead to substantial performance improvements, as you will see shortly in the benchmark. However, be aware that this could increase consumption of memory in your JDBC applications, which could have its own impact on performance and scalability.

double topSum = (num.Length * SumOfSqrs) - (Math.Pow(Sum, 2)); double n = (double)num.Length; return Math.Sqrt(topSum / (n * (n - 1))); }

Caution There is a bug in 10g Release 1 (and 9i Release 2), due to which if you use the numeric extension method (e.g., getIntArray()) when auto-buffering is enabled, the program can sometimes give a NullPointerException. In particular, in my tests, I was able to reproduce this bug consistently when I first used the getArray() method and then used the getIntArray() method immediately on the same array to retrieve collection elements (with auto-buffering enabled).

When you enable the automatic indexing on an array, Oracle maintains an index structure to improve the access time of an element. The ARRAY class contains the following methods to support automatic array indexing: public throws public throws synchronized void setAutoIndexing (boolean enable, int direction) SQLException; synchronized void setAutoIndexing(boolean enable) SQLException;

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