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CHAPTER 11 USING ORACLE COLLECTIONS AND REFERENCES
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Custom collection classes (produced by JPublisher) allow you to get and set individual elements using the getElement() and setElement() methods. Recall that the ARRAY class does not provide you with any setter methods for setting an array element. A custom class must satisfy the following requirements: It must implement the oracle.sql.ORAData and oracle.sql.ORADataFactory interfaces, which we covered in 10. It must provide a means of storing the collection data (e.g., in a member ARRAY object). We will use JPublisher to generate these classes for the object type emp_type and our varray, emp_type_varray. Please refer to 10 for details on how to use the JPublisher utility. We use the following properties file (called prop.txt) for our JPublisher run: jpub.user=benchmark/benchmark jpub.methods=all jpub.builtintypes=jdbc jpub.numbertypes=objectjdbc jpub.usertypes=oracle jpub.package=book.ch11.jpub jpub.input=input.txt
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Note You may need to modify the jpub.package property to give a package name according to your
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directory structure; this is the package to which the generated classes belong.
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The file input.txt referred to in the property jpub.input contains the following lines: SQL ADDRESS AS Address SQL NESTED_TABLE_OF_ADDRESSES AS AddressList As you can see, we plan to generate a class Address for our object type address and a class AddressList for our varray emp_table.
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Note When you use JPublisher to create a custom collection class, you must use the ORAData implementation. This is the case if JPublisher s -usertypes mapping option is set to oracle, as is the case in this section s example (as shown by the line jpib.usertypes=oracle). You can t use a SQLData implementation for a custom collection class (such an implementation is available for a custom object class only).
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Once you have set up the prop.txt and input.txt files with the preceding contents in your directory, you can generate the classes by running the JPublisher command as follows: jpub -props=prop.txt
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CHAPTER 11 USING ORACLE COLLECTIONS AND REFERENCES
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When I executed the preceding command, it generated the following files in my directory: Address.java, AddressList.java, and AddressRef.java (and their class files). We will ignore AddressRef.java for now since for our purpose, we need only the classes Address and AddressList. The class Address corresponds to a single database address object. The generated Java file for the Address class (edited for clarity) is as follows: package book.ch11.jpub; /* Some imports deleted for clarity */ import oracle.sql.Datum; import oracle.sql.STRUCT; import oracle.jpub.runtime.MutableStruct; public class Address implements ORAData, ORADataFactory { public static final String _SQL_NAME = "BENCHMARK.ADDRESS"; public static final int _SQL_TYPECODE = OracleTypes.STRUCT; protected MutableStruct _struct; private static int[] _sqlType = { 12,12,12,12,12,12 }; private static ORADataFactory[] _factory = new ORADataFactory[6]; protected static final Address _AddressFactory = new Address(); public static ORADataFactory getORADataFactory() { return _AddressFactory; } /* constructors */ protected void _init_struct(boolean init) { if (init) _struct = new MutableStruct(new Object[6], _sqlType, _factory); } public Address() { _init_struct(true); } public Address(String line1, String line2, String street, String city, String state, String zip) throws SQLException { _init_struct(true); setLine1(line1); setLine2(line2); setStreet(street); setCity(city); setState(state); setZip(zip); } /* ORAData interface */ public Datum toDatum(Connection c) throws SQLException { return _struct.toDatum(c, _SQL_NAME); }
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CHAPTER 11 USING ORACLE COLLECTIONS AND REFERENCES
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/* ORADataFactory interface */ public ORAData create(Datum d, int sqlType) throws SQLException { return create(null, d, sqlType); } protected ORAData create(Address o, Datum d, int sqlType) throws SQLException { if (d == null) return null; if (o == null) o = new Address(); o._struct = new MutableStruct((STRUCT) d, _sqlType, _factory); return o; } /* accessor methods */ public String getLine1() throws SQLException { return (String) _struct.getAttribute(0); } public void setLine1(String line1) throws SQLException { _struct.setAttribute(0, line1); } /* accessor methods for other attributes deleted for clarity */ } The generated class AddressList (edited for clarity), which represents the nested table nested_table_of_addresses, is as follows: package book.ch11.jpub; /* imports deleted for clarity */ public class AddressList implements ORAData, ORADataFactory { public static final String _SQL_NAME = "BENCHMARK.NESTED_TABLE_OF_ADDRESSES"; public static final int _SQL_TYPECODE = OracleTypes.ARRAY; MutableArray _array; private static final AddressList _AddressListFactory = new AddressList(); public static ORADataFactory getORADataFactory() { return _AddressListFactory; } /* constructors */ public AddressList() { this((Address[])null); } public AddressList(Address[] a) { _array = new MutableArray(2002, a, Address.getORADataFactory()); } /* ORAData interface */
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