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Figure 6 4 Edit Relationship Dialog Box of
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LeagueEJB-TeamEJB Relationship In the Edit Relationship dialog box, the Multiplicity choice should be One to Many This choice indicates that a single league has multiple teams
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For (Enterprise Bean B), the Delete When Bean A Is Deleted checkbox is selected Because of this selection, when a instance is deleted the related instances are automatically deleted This type of deletion, in which one deletion triggers another, is called a cascade delete For , the corresponding checkbox is disabled: If you delete a team, you don t want to automatically delete the league, because there may be other teams in that league In general, if a bean is on the multiple side of a relationship, the other bean cannot be automatically deleted
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General Tab (PlayerEJB) This tab shows the enterprise bean class and interfaces Since the entity bean uses container-managed persistence, it has local interfaces It does not have remote interfaces because it does not allow remote access Entity Tab (PlayerEJB) The radio buttons at the top of the tabbed page define the bean s persistence type (Figure 6 5) For , this type is container-managed persistence, version 20 (Because version 10 did not support relationships, it is not recommended These version numbers identify a particular release of the Enterprise JavaBeans Specification, not the J2EE SDK software)
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, the relationship field is and for it is is on the multiple side of the relationship, the field is a In contrast, since is on the single side of the relationfield is a single-valued object, a The code defines the league relationship field with these access methods:
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The Fields To Be Persisted box lists the persistent and relationship fields defined by the access methods in the code The checkboxes for the persistent fields must be selected, but those for the relationship fields must not be selected The entity bean has one relationship field: The abstract schema name is , a name that represents the relationships entity bean This abstract name is referand persistent fields of the enced in the Enterprise JavaBeans Query Language (EJB QL) queries For more information on EJB QL, see 8 Finder/Select Methods Dialog Box (PlayerEJB) To open this dialog box, click Finder/Select Methods on the Entity tab This dialog box(Figure 6 6) enables you to view and edit the EJB QL queries for a bean s finder and select methods For example, to list the finder methods defined interface, select the Local Finders radio button When in the you select the finder method, its EJB QL query appears in an editable text field
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Figure 6 5 Entity Tab of
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Figure 6 6 Finder/Select Methods Dialog Box of PlayerEJB
Entity Deployment Settings Dialog Box (PlayerEJB) To view this dialog box, click Deployment Settings in the Entity tab In this dialog box, you define the runtime settings of an entity bean with container-managed persistence These runtime settings are specific to the J2EE SDK; other implementations of the J2EE platform may take a different approach In the J2EE SDK, the bean s persistent fields are stored in a relational database table In the checkboxes of the Database Table box, you specify whether or not the server automatically creates or drops the table If you want to save the data in your table between deployments, then make sure that the Delete Table checkbox is not selected Otherwise, every time you undeploy the bean, the table will be deleted The J2EE server accesses the database by issuing SQL calls In an entity bean with container-managed persistence, you do not code these calls The utility creates the SQL calls automatically when you click the Generate Default SQL button To view the SQL statement for a finder method, for example, select the Local Finder radio button and then select an entry in the Method list You may modify a SQL statement by editing the text in the SQL Query field