Implementing Finder Methods in Bean-Managed Persistence in Visual Studio .NET

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Implementing Finder Methods in Bean-Managed Persistence
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The finder method in the home interface is related to the corresponding finder method implementation in the EJB object by a convention established in the EJB specification Both methods have the same parameters and return type, but the method name also includes the prefix ejb For example, the f indFoo () in the home interface is implemented by the EJB object method ejbFindFoo () This follows the convention for the create () and ejbCreate () methods The ejbFindByPrimaryKey () method implementation in the PizzaUnitsEB bean is as follows:
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/** * Searches for a PizzaUnitsEB Entity EJB, by its primary key */ public PizzaUnitsEBPK ejbFindByPrimaryKey(PizzaUnitsEBPK primaryKey) throws FinderException { if ((primaryKey == null) (primaryKeyp_name == null) | (primaryKeyp_size == null) || (primaryKeyi_name == null)) throw new FinderException ("primary key cannot be null"); refresh(primaryKey); return primaryKey;
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The implementation includes a helper method, refresh (), used internally to load the information from the database into the bean It does this by accessing all three tables and getting all the defined fields All the database access is done using JDBC Basically, this method does all the hard work of retrieving the data It can be considered the equivalent of the e jbLoad () method in the CMP case /**
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* This method does the actual load of data from the database * The loaded fields are from the tables: <tt>units</tt>, * <tt>pizza</tt> and <tt>ingredient</tt> * * @param primaryKey PizzaUnitsEBPK Primary Key * @exception javaxejbEJBException */ private void refresh(PizzaUnitsEBPK primaryKey) throws EJBException { if (primaryKey == null) { throw new EJBException ("primary key cannot be null"); } Connection conn = null; PreparedStatement pstmt = null; ResultSet resultSet = null; try { // Given pizza name and size, and ingredient name, get units // This information is kept in the PizzaUnitsEBPK class conn = DriverManagergetConnection("jdbc:weblogic:jts:p2gPool"); String select = "select u_units from units " + " where unitsu_p_name = and unitsu_p_size = and " + " unitsu_i_name = "; pstmt = connprepareStatement(select); pstmt setStringd, primaryKeyp_name) ; pstmtsetString(2, primaryKeyp_size) ; pstmtsetString(3, primaryKeyi_name) ; pstmtexecuteQuery(); resultSet = pstmtgetResultSet(); if (resultSetnext()) { p_name = primaryKeyp_name; p_size = primaryKeyp_size; i_name = primaryKeyi_name; u_units = resultSetgetFloat("u_units"); } else { throw new EJBException ("Refresh: PizzaUnitsEB (" + primaryKeyp_name + "," + primaryKeyp_size + "," + primaryKeyi_name + ") not found"); } resultSetclose(); pstmtcloset); // Get the price for the pizza, depends on its name and size select = "select p_base_price from pizza " + " where pizzap_name = and pizzap_size = "; pstmt = connprepareStatement(select); pstmtsetString(1, primaryKeyp_name) ; pstmtsetString(2, primaryKeyp_size) ; pstmtexecuteQuery();
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resultSet = pstmtgetResultSet(); if (resultSetnext()) { p_base_price = resultSetgetFloat("p_base_price"); } else { throw new EJBException ("Refresh: PizzaUnitsEB (" + primaryKeyp_name + "," + primaryKeyp_size + "," + primaryKeyi_name + ") not found"); } resultSetclose(); pstmtclose(); // Get the ingredient details select = "select i_remarks from ingredient " + " where ingredienti_name = "; pstmt = connprepareStatement(select); pstmtsetstring(l, primaryKeyi_name); pstmtexecuteQuery(); resultSet = pstmtgetResultSet(); if (resultSetnext()) { i_remarks = resultSetgetString("i_remarks"); } else { throw new EJBException ("Refresh: PizzaUnitsEB (" + primaryKeyp_name + "," + primaryKeyp_size + "," + primaryKeyi_name + ") not found"); } } catch (SQLException sqe) { throw new EJBException (sqegetMessage()); } finally { try { if (resultSet != null) resultSetclose(); if (pstmt != null) pstmtclose(); if (conn != null) connclose(); } catch (Exception e) { throw new EJBException (egetMessage()); } } }
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The e jbFindByPizza ( ) method searches for all the beans that are ingredients of a specified pizza It returns an enumeration of the primary keys of the beans that match the condition The enumeration is ordered alphabetically by ingredient name The sort is requested in the prepared statement used to call the database
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* Searches for one or more ingredients and units of a given Pizza * It returns all the primary keys of the E-EJB found * The enumeration is ordered by ingredient name * * Sparam pizza the Pizza * @return Enumeration EJB Primary Keys * @exception javaxejbFinderException */ public Enumeration ejbFindByPizza (Pizza pizza) throws FinderException {
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