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To avoid this, the SafeDataReader class takes care of these details automatically, by eliminating null values and converting them into a set of default values As a rule, data reader objects are sealed, meaning that you can t simply subclass an existing data reader class (such as SqlDataReader) and extend it However, like the SmartDate class with DateTime, it is quite possible to encapsulate or wrap a data reader object..

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Finally, use a PreparedStatement object s setObject() method to set the value of the object, and then update the table containing the object with the modified value The following listing contains an example illustrating these steps Before executing the program, the database had the following three entries in the table item_table: benchmark@ORA10G> select * from item_table it order by itid; ID NAME DESCRIPTION --- ---------- ----------------------------------1 item1 item1 desc 2 item2 item2 desc using prepared statement 3 item2 item2 desc using callable stmt The program StructUpdateExample retrieves one item object and updates its description attribute We do this using the oraclesqlSTRUCT object first, and then we use relational SQL to achieve the same objective The program listing follows, with explanatory comments interspersed..

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To ensure that SafeDataReader can wrap any data reader object, it relies on the root System.Data. IDataReader interface that s implemented by all data reader objects. Also, since SafeDataReader is to be a data reader object, it must implement that interface as well: public class SafeDataReader : IDataReader { private IDataReader _dataReader; protected IDataReader DataReader { get { return _dataReader; } } public SafeDataReader(IDataReader dataReader) { _dataReader = dataReader; } }

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/** This program demonstrates how to use the java.sql.Struct class * to update data in a table containing object columns. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0, and 9.2.0.1.0 */ import java.sql.SQLException; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.Connection; import java.sql.Struct; import java.sql.Types; import java.math.BigDecimal; import oracle.sql.STRUCT; import oracle.sql.StructDescriptor; import book.util.JDBCUtil; class StructUpdateExample { public static void main(String args[]) throws SQLException { Connection conn = null; try { conn = JDBCUtil.getConnection("benchmark", "benchmark", "ora10g"); To carry out the update that uses the oracle.sql.STRUCT class, we first select an item with the id value of 2 as a Struct by invoking the method _getItem() (explained shortly): Struct itemStruct = _getItem( conn, 2 ); Next, we pass it on to the method _demoUpdateUsingSTRUCT(), which will update its description attribute using the oracle.sql.STRUCT class: _demoUpdateUsingSTRUCT( conn, 2, itemStruct ); Finally, we demonstrate how, by using relational SQL, we can not only update just the attribute we need to but also do it in one step without having to select the object into memory first: _demoUpdateUsingRelationalSQL( conn, 3 ); } finally { // release resources in the finally clause. JDBCUtil.close( conn ); } }

The class defines a field to store a reference to the real data reader that it is encapsulating. That field is exposed as a protected property as well, allowing for subclasses of SafeDataReader in the future. There s also a constructor that accepts the IDataReader object to be encapsulated as a parameter. This means that ADO.NET code in a business object s DataPortal_Fetch() method might appear as follows: SafeDataReader dr = new SafeDataReader(cm.ExecuteReader()); The ExecuteReader() method returns an object that implements IDataReader (such as SqlDataReader) that is used to initialize the SafeDataReader object. The rest of the code in DataPortal_Fetch() can use the SafeDataReader object just like a regular data reader object, because it implements IDataReader. The benefit, though, is that the business object s data access code never has to worry about getting a null value from the database. The implementation of IDataReader is a lengthy business it contains a lot of methods so I m not going to go through all of it here. Instead I ll cover a few methods to illustrate how the overall class is implemented.

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