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We update an object by selecting it into memory, changing the in-memory Java object as required, and using the Java object to update the object value in the database. An important point to note is that when we select an object in memory, we don t have exclusive access to it, because in Oracle reads don t block writes. So it is possible that the changes we make are overridden by someone else who happens to be simultaneously updating the same set of rows using the same technique. This phenomenon is called lost updates. We will revisit and resolve this issue in detail in 16. To avoid lost updates, we need to lock any selected rows. We do that by using the for update nowait clause in our select statement. This tells Oracle to either lock the row for us or fail with an exception if the lock is already held by someone else updating the same row. The method _demoUpdate() illustrates this concept: private static void _demoUpdate( Connection connection ) throws SQLException { As a first step, we need to select the object using the concepts discussed in the section Selecting Objects earlier. The only major difference is that the select statement has a phrase for update nowait at the end to indicate that we want to try and lock any rows that get selected: PreparedStatement pstmt = null; PreparedStatement pstmt1 = null; ResultSet rset = null; try { MyAddress myAddress = null; String selectStmt = "select value(a) from address_table a"+ " where line1 = for update nowait"; pstmt = connection.prepareStatement ( selectStmt ); pstmt.setString( 1, "145 Apt # 7" ); rset = pstmt.executeQuery();

while( rset.next() ) { myAddress = (MyAddress) rset.getObject(1); After obtaining the object, we modify the street attribute (you can, of course, change any other attribute as well): myAddress.setStreet ( "Wonderful St" ); Then we update the corresponding row: String updateStmt = "update address_table a" + " set value(a) = " + " where a.line1 = "; pstmt1 = connection.prepareStatement ( updateStmt ); pstmt1.setObject (1, myAddress ); pstmt1.setString (2, "145 Apt # 7" ); int rows = pstmt1.executeUpdate(); System.out.println ( "Updated " + rows + " rows " ); } connection.commit(); } finally { JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); JDBCUtil.close( pstmt1 ); } }

This information is ultimately sourced from Yahoo! as CSV over HTTP. This CSV file is returned from a call to the iFinance server at Yahoo! using a URL call similar this:

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There is nothing special about deleting an object. It is a simple relational statement, as illustrated in the following definition of the method _demoDelete(): private static void _demoDelete( Connection connection ) throws SQLException { PreparedStatement pstmt = null; try { String deleteStmt = "delete address_table a" + " where a.line1 = "; pstmt = connection.prepareStatement ( deleteStmt ); pstmt.setString (1, "145 Apt # 7" ); int rows = pstmt.executeUpdate(); System.out.println ( "Deleted " + rows + " row(s) " ); connection.commit(); }

finally { JDBCUtil.close( pstmt ); } } }

This returns a CSV file with the following format:

Previously, we manually created the wrapper method corresponding to the method get_address() of the object type address. In this section, we ll look at how to do this automatically using JPublisher. To generate the wrapper method automatically, the only change we need to make is to modify the option methods=none to methods=all in prop_address.txt. This results in a new prop_address.txt file, the contents of which are as follows:. jpub.user=benchmark/benchmark jpub.methods=all jpub.builtintypes=jdbc jpub.numbertypes=objectjdbc jpub.usertypes=jdbc jpub.package=book.ch08.jpub jpub.input=input_address.txt For clarity, we specify the class names to be AddressAuto and MyAddressAuto in the file input_address.txt, which now looks as follows. input_address.txt results in two classes: a parent class called AddressAuto and a child class MyAddressAuto. SQL ADDRESS GENERATE AddressAuto AS MyAddressAuto The relevant portions of the generated parent class file AddressAuto.java (partially edited for clarity) are as follows: /*@lineinfo:filename=AddressAuto*//*@lineinfo:user-code*//*@lineinfo:1^1*/ package book.ch10.jpub; /* Some other imports deleted for clarity */ import oracle.jpub.runtime.MutableStruct; import sqlj.runtime.ref.DefaultContext; import sqlj.runtime.ConnectionContext; public class AddressAuto implements SQLData { public static final String _SQL_NAME = "BENCHMARK.ADDRESS"; public static final int _SQL_TYPECODE = OracleTypes.STRUCT; /* connection management */ protected DefaultContext __tx = null; protected Connection __onn = null;

public void setConnectionContext(DefaultContext ctx) throws SQLException { release(); __tx = ctx; } public DefaultContext getConnectionContext() throws SQLException { if (__tx==null) { __tx = (__onn==null) DefaultContext.getDefaultContext() : new DefaultContext(__onn); } return __tx; }; public Connection getConnection() throws SQLException { return (__onn==null) ((__tx==null) null : __tx.getConnection()) : __onn; } public void release() throws SQLException { if (__tx!=null && __onn!=null) __tx.close(ConnectionContext.KEEP_CONNECTION); __onn = null; __tx = null; } private String m_line1; private String m_line2; private String m_street; private String m_city; private String m_state; private String m_zip; /* constructors */ public AddressAuto() { __tx = DefaultContext.getDefaultContext(); } public AddressAuto(DefaultContext c) /*throws SQLException*/ { __tx = c; } public AddressAuto(Connection c) /*throws SQLException*/ { __onn = c; } public AddressAuto(String line1, String line2, String street, String city, String state, String zip) throws SQLException { setLine1(line1); setLine2(line2); setStreet(street); setCity(city); setState(state); setZip(zip); } public void readSQL(SQLInput stream, String type) throws SQLException { setLine1(stream.readString()); setLine2(stream.readString()); setStreet(stream.readString()); setCity(stream.readString()); setState(stream.readString());

Date,Open,High,Low,Close,Volume,Adj. Close* 3-Mar-06,26.81,27.16,26.74,26.93,45218800,26.93 2-Mar-06,27.02,27.10,26.90,26.97,41850300,26.97 1-Mar-06,26.98,27.20,26.95,27.14,53061200,27.14

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