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CHAPTER 11 USING ORACLE COLLECTIONS AND REFERENCES
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To demonstrate access and modification of a collection containing only numbers, we next create a varray of number elements called varray_of_numbers: benchmark@ORA10G> create or replace type varray_of_numbers as 2 varray(20) of number; 3 / Type created. We follow it up by creating a table, varchar_varray_table, that contains the varchar2 varray as a column. We also create a table, number_varray_table, that contains the number varray as a column: benchmark@ORA10G> create table varchar_varray_table 2 ( 3 varray_column varray_of_varchars 4 ); Table created. benchmark@ORA10G> create table number_varray_table 2 ( 3 varray_column varray_of_numbers 4 ); Table created. To illustrate how to access and manipulate collections from Java using the CallableStatement interface, we create a package called demo_varray_pkg that contains a single procedure, demo_passing_varray_param, which takes a parameter of type varray_of_varchars: benchmark@ORA10G> create or replace package demo_varray_pkg 2 as 3 procedure demo_passing_varray_param( p_varchar_varray in varray_of_varchars ); 4 end; 5 / Package created. benchmark@ORA10G> create or replace package body demo_varray_pkg 2 as Inside the procedure demo_passing_varray_param(), we insert a row into the table that contains the varray column. Later we can query this table from the SQL*Plus prompt to verify that our JDBC program worked as expected. 11 12 13 14 procedure demo_passing_varray_param( p_varchar_varray in varray_of_varchars ) is begin insert into varchar_varray_table values ( p_varchar_varray );
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CHAPTER 11 USING ORACLE COLLECTIONS AND REFERENCES
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end; end; /
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Package body created. We next populate the table number_varray_table with some sample data and issue a commit: benchmark@ORA10G> insert into number_varray_table values( varray_of_numbers(1, 2, 3, 4, 5) ); 1 row created. benchmark@ORA10G> commit; Commit complete. The next section describes the JDBC code to access these varray elements as weakly typed ARRAY class objects.
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Manifesting Collections of Built-in Types As ARRAY Objects
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In this section, we ll look at how we can retrieve a collection of built-in type as an ARRAY object. We ll first examine how to pass a varray to a PL/SQL procedure. Then we ll look at how a varray can be materialized in Java as an ARRAY of built-in types, such as String, using a PreparedStatement. Let s begin by creating and passing an ARRAY to a procedure.
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Creating and Passing an ARRAY to a PL/SQL Procedure
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As discussed earlier, the ARRAY class implements the standard Array interface, using which you can retrieve the entire collection, a subset of the collection, the collection name, or the base SQL type name of the collection (you ll learn more about each of these soon). However, when using the ARRAY class, you can t modify the collection in the JDBC layer, as it does not provide any setter methods. Creating and passing an ARRAY to a PL/SQL procedure involves three steps: 1. Create an ArrayDescriptor. An ArrayDescriptor is an object of type oracle.sql.ArrayDescriptor that describes the ARRAY object. As mentioned earlier, only one array descriptor is necessary for a particular collection type. For example, you can create an array descriptor object for the varray element varray_of_varchars and reuse it as many times as you want to create different ARRAY objects of the same collection type (assuming that the definition of the underlying collection has not changed). 2. Create an ARRAY object. The next step is to create the ARRAY object that we want to pass to our procedure using the constructor whose signature follows: public oracle.sql.ARRAY(oracle.sql.ArrayDescriptor descriptor, java.sql.Connection connection, java.lang.Object arrayElements ); 3. Pass the ARRAY object to the procedure. The final step is to pass the ARRAY object to the CallableStatement object using the setArray() method of the CallableStatement interface.
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CHAPTER 11 USING ORACLE COLLECTIONS AND REFERENCES
We illustrate each of these steps as part of the description of the class DemoPassing CollectionToProcedure as follows: /** This program demonstrates how to pass a collection into a * PL/SQL procedure from JDBC. * COMPATIBLITY NOTE: * runs successfully against 9.2.0.1.0 and 10.1.0.2.0 */ import java.sql.SQLException; import java.sql.Connection; import java.sql.CallableStatement; import oracle.jdbc.OracleConnection; import oracle.sql.ArrayDescriptor; import oracle.sql.ARRAY; import book.util.JDBCUtil; import book.util.Util; class DemoPassingCollectionToProcedure { The main() method invokes the method _doPassArrayToAProcedure(), passing the Connection object and issuing a commit. The method _doPassArrayToAProcedure() contains the bulk of the logic: public static void main(String args[]) throws Exception { Util.checkProgramUsage( args ); Connection conn = null; try { conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]); _doPassArrayToAProcedure( conn ); conn.commit(); } finally { // release JDBC resources JDBCUtil.close( conn ); } } The method _doPassArrayToAProcedure() is defined as follows: private static void _doPassArrayToAProcedure( Connection conn ) throws SQLException { CallableStatement cstmt = null; try {
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