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CHAPTER 11 USING ORACLE COLLECTIONS AND REFERENCES
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The first step is to create the array descriptor. Note that we first check if the Connection object has a descriptor already populated with an array descriptor for our varray type. If it does, we can simply reuse the returned array descriptor. If it doesn t, we create one. Please note that the method getDescriptor() is an Oracle extension method, and to access it you need to cast the Connection object to the OracleConnection interface: ArrayDescriptor arrayDescriptor = (ArrayDescriptor) ((OracleConnection) conn).getDescriptor( "BENCHMARK.VARRAY_OF_VARCHARS" ); if( arrayDescriptor == null ) { System.out.println("creating array descriptor"); arrayDescriptor = ArrayDescriptor.createDescriptor( "BENCHMARK.VARRAY_OF_VARCHARS", conn ); } As part of the second step, we first create the array contents. In our case, our varray element is made up of varchar2, so the corresponding Java elements would be String objects. Thus we simply create an array of String with two elements: String[] elements = new String[] { "elem 1", "elem 2" }; We then create the ARRAY object, initializing it with the String array we created above: ARRAY array = new ARRAY ( arrayDescriptor, conn, elements ); The third and final step is to invoke the procedure using the CallableStatement interface. In particular, note that we use the method setArray() to pass the array value to the procedure. We could also have used the method setObject() with the same result: String stmtString = "begin demo_varray_pkg.demo_passing_varray_param( ); end;"; cstmt = conn.prepareCall( stmtString ); cstmt.setArray( 1, array ); cstmt.execute(); } finally { JDBCUtil.close( cstmt); } } } Invoking the preceding class should result in the following output: B:\>java DemoPassingCollectionToProcedure ora10g URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521) (HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) creating array descriptor
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CHAPTER 11 USING ORACLE COLLECTIONS AND REFERENCES
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A quick select verifies that the procedure invocation was successful (recall that we inserted the passed array into the table varchar_varray_table in the procedure): benchmark@ORA10G> select * from varchar_varray_table; VARRAY_COLUMN --------------------------------------VARRAY_OF_VARCHARS('elem 1', 'elem 2') In the next section, we examine how we can use PreparedStatement in conjunction with the ARRAY class to materialize a collection of built-in types.
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Using an ARRAY Class for Accessing Collections of Built-in Types
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This section shows how to select a varray of built-in data types from the database using the ARRAY class. This process involves the following steps: 1. Prepare and execute the statement. This is the familiar step of preparing and executing a select statement that selects the Collection object. 2. Retrieve the ARRAY object from the ResultSet. In this step, we use the getArray() method on the ResultSet object to retrieve the ARRAY object. Note that if no rows are selected, we get a null ARRAY object returned. 3. Retrieve individual elements from the ARRAY object. Finally, we retrieve individual array elements. We will demonstrate the case of retrieving the array of varchar2 (varray_of_varchars type) and array of number (varray_of_numbers) separately. To retrieve the individual collection elements, we can use either the standard method getArray() of the Array interface, or one of the two methods getResultSet() or getOracleArray() of the ARRAY class. For numeric collections, we can, in addition to the aforementioned methods, use one of the many numeric extension methods (such as getIntArray()). Choosing between these methods is, to a large extent, a matter of convenience, although there are some performance implications as well. We will examine these methods along with examples shortly. The following sections detail each of these steps as part of the explanation of the class DemoQueryingCollectionOfBuiltInTypes presented here: /** This program demonstrates how to select a collection of built-in types * into JDBC (we use varray of varchar2 and varray of number * to demonstrate the concepts). * COMPATIBLITY NOTE: * runs successfully against 9.2.0.1.0 and 10.1.0.2.0 */ import java.math.BigDecimal; import java.sql.SQLException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.Types; import java.sql.ResultSet;
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CHAPTER 11 USING ORACLE COLLECTIONS AND REFERENCES
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import oracle.sql.ArrayDescriptor; import oracle.sql.ARRAY; import oracle.sql.Datum; import oracle.sql.NUMBER; import oracle.sql.CHAR; import book.util.JDBCUtil; import book.util.Util; class DemoQueryingCollectionOfBuiltInTypes { The main() method first invokes two functions passing the Connection object. The method _doSelectVarchar2Array() returns an ARRAY of varchar2 elements, whereas the method _doSelectNumberArray() returns an ARRAY of number elements. These two methods are explained along with their definitions as part of this listing. The method _printArrayInfo(), invoked once each for the two returned arrays, is used to print information about the passed array object as you will see shortly. public static void main(String args[]) throws Exception { Util.checkProgramUsage( args ); Connection conn = null; try { conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]); ARRAY varcharArray = _doSelectVarchar2Array( conn ); ARRAY numberArray = _doSelectNumberArray(conn ); _printArrayInfo( varcharArray ); _printArrayInfo( numberArray ); } finally { // release JDBC resources JDBCUtil.close( conn ); } } Retrieving a Collection of Varchar2 Elements The method _doSelectVarchar2Array() demonstrates how to retrieve members of a collection of varchar2 elements from a table. private static ARRAY _doSelectVarchar2Array( Connection conn ) throws SQLException { PreparedStatement pstmt = null; ResultSet rset = null; ARRAY array = null; try {
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