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Creating CMP entity beans from an imported data source return type of the getter method and the type of the parameter passed to the field s setter method. Click the Edit RDBMS Relation button to display the WebLogic RDBMS Relation Editor. If, in the relationship inspector you specified the Multiplicity as One To One or One To Many, the editor looks like this: From the first drop-down Table list, select one of the tables you want to use to establish a relationship with another table. From the second drop-down Table list, select the other table in the relationship. When a table is selected in either of the Table lists, the tables columns are listed in the list box below the Table list. In the list of the columns in the first table, click the column you are using to create the relationship and drag to the column that contains the same data type in the second table that you are using to complete the relationship. Your results should look like something like this: 56 Developing Applications with Enterprise JavaBeans
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Creating CMP entity beans from an imported data source Click OK when you are done with the Edit Table Reference editor to return to the new field s inspector. You can use this inspector to specify if the relationship is one to one, one to many, or many to many. You can also specify whether the relationship is unidirectional or bidirectional. If you select bidirectional, a new field also appears in the second bean. For example, if you have an Employee entity bean and a Project entity bean, you might want to create a relationship that allows an employee to have multiple projects as well as keeping track of all the employees on a single project. In this case, the direction of the relationship is bidirectional. Therefore, the Employee bean will have a new field named project, and the Project bean will have a new field named employee. If you want the related rows in the other table in a relationship to be deleted when the first row of a table is deleted, set the Cascade Delete field to true. For example, a customer may shop in an online store and create an order, so there may be a Customer table and an Order table. If the Customer table has a relationship with the Order table through its order field and the Cascade Delete field is true, when the customer is deleted, all orders made by that customer are deleted also. The Cascade Delete field can be set for one to one or one to many relationships only. Use the CMR Field Properties in the inspector to specify in which interface(s) the getter and setter access methods are declared. The Return Type field value is the return type of the getter method and the type of the parameter passed to the field s setter method. Specifying a WebLogic relationship To specify how the relationship is to be created, click the new field that has been added to the bean you began specifying the relationship from. A relationship inspector appears: Specify whether the relationship will be one to one, one to many, or many to many using the Multiplicity field. You can also specify whether the relationship is unidirectional or bidirectional. If you select bidirectional, a new field also appears in the second bean. For example, if you have an Employee entity bean and a Project entity bean, you might want to create a relationship that allows an employee to have multiple projects as well as keeping track of all the employees on a single project. In this case, the direction of the relationship is bidirectional. Therefore, the Employee bean will have a new field named project, and the Project bean will have a new field named employee. If you want the related rows in the other table in a relationship to be deleted when the first table is deleted, set the Cascade Delete field to true. For example, a project has employees. If the Project table has a relationship with the Employee table through its employee field and the Cascade Delete field is true, when the project is deleted, all employees on that project are deleted also. The Cascade Delete field can be set for one to one or one to many relationships only. Use the CMR Field Properties in the inspector to specify in which interface(s) the getter and setter access methods are declared. The value of the Return Type field is the Chapter 6: Creating entity beans with the EJB designer 55
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Creating CMP entity beans from an imported data source Click the Edit Table Reference button to display the Table Reference editor: If the two tables have one or more columns with the same name, the Table Reference editor will show lines drawn between the common columns of the two tables. If no common column names exists, you must draw a line between the columns you want to use to create the relationship. For example, if the Department table had a column called DEPT_NO, and the Employee table had a column called DEPT, you would click and drag from the DEPT_NO column of the Department table to the DEPT column of the Employee table. A line appears between the two columns, indicating the relationship. For many-to-many relationships you need a third table to make the connection between two tables. For example, you might have an Employee table that includes a column named EMP_NO. You might also have a Project table that includes a column named PROJ_ID. By themselves, the two tables have no columns you can use to create a relationship directly. If you had an Employee-Project table that consisted of two columns, EMP_NO and PROJ_ID, you could create a relationship between the Employee and Project table. In this case, in the table reference editor, you would click the Add Cross Table button. From the drop-down list that appears between the two tables, you would select the table that contains the columns to make the connection between the two tables. In this case, you would select the Employee-Project table. Then you would click and drag between the EMP_NO columns of the Employee table and the Employee-Project table, and do the same between the PROJ_ID columns of the Project table: 54 Developing Applications with Enterprise JavaBeans
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Creating CMP entity beans from an imported data source connects the two beans. The new field added in the Department bean is now named employee to reflect the new relationship. By default, the EJB designer creates relationships by looking for columns (or fields) with the same name in the two tables you are connecting. Often the two tables won t have a common column name. You, therefore, must specify how the relationship is to be created. If you want to define relationships between EJB 1.1 entity beans, use the EJB 1.x Entity Bean Modeler as described in Chapter 9, Creating EJB 1.x entity beans from an existing database table. Using the relationship inspector to specify a relationship To specify how the relationship is to be created, click the new field that has been added to the bean you began specifying the relationship from. A relationship inspector appears: Chapter 6: Creating entity beans with the EJB designer 53
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Creating CMP entity beans from an imported data source Note You can also add field groups using the EJB Module DD editor. Select the entity bean in the structure pane when the EJB Module DD editor is visible and click the WebLogic Persistence tab to see the page where you add field groups to the deployment descriptors. Click the Add button to display the Field Group editor. Entity bean field and method inspectors The inspector for an entity bean field looks like this: Use the inspector to change the field name, if you wish. You can specify the field s type, specify whether its value will be persisted, specify whether the field is a primary key for the table, specify if you want the field s value set in the ejbCreate() method in the bean class, specify where the field s access methods are defined, and map the field to the appropriate column in the table. If WebLogic Server 7.x or 8.x is your target, you can also specify the database column type (dbms-column-type); your choices are OracleClob, OracleBlob, LongString, and SybaseBinary, or the default value of none. The method inspector for entity beans is the same one used for session and message- driven beans. See Adding a new method on page 28 if you want more detail. Creating entity bean relationships Note You cannot use the EJB designer to create relationships between EJB 1.1 entity beans. To create relationships between EJB 1.1 entity beans, use the EJB 1.x Entity Bean Modeler. For more information see Chapter 9, Creating EJB 1.x entity beans from an existing database table. You can create relationships between EJB 2.0 entity beans. For example, if you have a Department table and an Employee table, you might want to create a relationship that reflects which employees are in which departments. In this example, you would right- click the Department bean representation in the EJB designer pane and choose Add| Relationship or click the Add icon on the toolbar and choose Relationship. When you do, a new field appears in the Department bean. Then click the Employee bean and a line 52 Developing Applications with Enterprise JavaBeans
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Creating CMP entity beans from an imported data source 5 Now you can return to your entity bean, add new fields, and map those fields to the columns in the table you established a reference to. For example, here a new field named department_no has been added to the Employee bean. The inspector shows the new field being mapped to the DEPT_NO column in the DEPARTMENT table. Note You can also do multiple table mapping using the EJB Module DD editor. Select the entity bean in the structure pane when the EJB Module DD editor is visible and click the WebLogic Persistence tab to see the page where you select the multiple table mapping option. Click the Add button to display the Table Map editor. Note that a Field Groups box appears in a WebLogic entity bean inspector. A field- group element represents a subset of the container-managed persistence fields and the container-managed relationship fields of an entity bean. For more information about field groups and how they are used, consult your WebLogic documentation. Note Field groups are applicable to CMP 2.0 entity beans only. To add a field group, 1 Click the Add button. The Field Group editor appears: 2 Give the new group a name in the Field Group Name field. 3 Check the fields you want to be included in the group. 4 Click OK. Chapter 6: Creating entity beans with the EJB designer 51
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Creating CMP entity beans from an imported data source The Verify Columns field is used to specify that the columns should be checked for validity just before a transaction is committed to make sure no other transaction has changed the column s data. Select Read if you want all columns that have been read during the transaction to be checked. Select Modified if you want only the columns that have been updated during the transaction to be checked. Select either Version or Timestamp to specify that a column containing version or timestamp data exists in the table and that this column is to be used to implement optimistic concurrency. The Optimistic Column field is enabled if you selected Version or Timestamp as a Verify Columns value. Select the column from the drop-down list that contains the version or timestamp value. For more complete information about optimistic concurrency, see your WebLogic documentation. You can use the inspector to reference another table and map columns in that table to fields in this entity bean using the Multiple Table Mapping option. The Single Table Mapping option is the default. To reference another table and map columns to fields in your bean, 1 Select the Multiple Table Mapping option. 2 Click the Add button to display a Table Map Editor. 3 Select the table you want to map columns to from the Table drop-down list: 4 Click and drag between the primary keys in the table on the left to the column you want to map the column to in the table on the right. Here you see the empNo field of the Employee bean being linked to the MNGR_NO column of the DEPARTMENT table. 50 Developing Applications with Enterprise JavaBeans
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Creating CMP entity beans from an imported data source The table reference you created appears in the Table References box: 4 In the entity bean representation, click one of the fields you want to map to a column in the referenced table to display its field inspector. 5 In the Column Name drop-down list, select the column you want to map the field to: WebLogic table mappings Note Table mappings are applicable to CMP 2.0 entity beans only. If your target application server is WebLogic Server 7.x or 8.1, the entity bean inspector looks like this: Chapter 6: Creating entity beans with the EJB designer 49
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Creating CMP entity beans from an imported data source 2 Use the right drop-down list to specify the table you want to reference: 3 Click and hold down the mouse button on a column in the left table you want to link to a column in the right table. Drag a line to the column in the right table you want to link to: If you need a third table to make the connection between two tables (as you might in a many to many relationship), click the Add Cross Table button and select the table that has fields that can be used to link to both tables. Then click and drag between the columns of the three tables to complete the table reference. You can link multiple columns if it makes sense to do so. Choose OK when you are done. 48 Developing Applications with Enterprise JavaBeans
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Creating CMP entity beans from an imported data source All CMP entity beans have a Table Name field. Use the drop-down list to select the Table the entity bean is referencing if the correct table name isn t already selected. For CMP 2.0 beans, all the fields below the CMP Properties line can vary depending on your selected target server. Click the Properties button to view the CMP Properties of a CMP entity bean: The CMP Properties in the inspector set the container-managed persistence properties of the bean. These properties are specific to Borland application servers. They determine how the container manages the bean s persistence. Please see your Borland Enterprise Server documentation for information on these properties. Referencing another table Note Table references are applicable to CMP 2.0 entity beans only. Table References let you reference another table and map columns in that table to fields in this entity bean. Table references are available for entity beans that target the Borland Enterprise Server only. To create a table reference, 1 Click the Add button next to the Table Reference box in the entity bean inspector. The Table Reference editor appears: Chapter 6: Creating entity beans with the EJB designer 47
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