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CHAPTER 12 USING LOBs AND BFILEs
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import java.sql.Connection; import java.io.OutputStream; import java.io.IOException; import java.sql.PreparedStatement; import oracle.sql.CLOB; import book.util.JDBCUtil; import book.util.Util; class DemoTemporaryLobs { The main() method simply invokes the method _insertClobUsingTemporaryClob() and commits. The method _insertClobUsingTemporaryClob() creates a temporary CLOB and inserts it into the table clob_table: public static void main(String args[]) throws Exception { Util.checkProgramUsage( args ); Connection conn = null; try { // get connection (autocommit is set to false) conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]); _insertClobUsingTemporaryClob( conn ); conn.commit(); } finally { // release resources associated with JDBC in the finally clause. JDBCUtil.close( conn ); } } In the method _insertClobUsingTemporaryClob(), we first declare variables before the try catch block begins: /* demos how to insert a CLOB using temporary CLOBs. */ private static void _insertClobUsingTemporaryClob( Connection conn ) throws SQLException, IOException { String insertStmt = "insert into clob_table(x, id, clob_col) " + " values( , , ) "; PreparedStatement pstmt = null; OutputStream out = null; CLOB tempClob = null; try { We invoke the method createTemporary() to create a temporary CLOB: tempClob = CLOB.createTemporary( conn, true, CLOB.DURATION_SESSION );
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CHAPTER 12 USING LOBs AND BFILEs
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We next open the CLOB. Opening and closing of LOBs in general improves performance when you do multiple writes to the LOB: tempClob.open( CLOB.MODE_READWRITE); We next get the chunk size and initialize a byte array of a size equal to the chunk size with the character b : int chunkSize = tempClob.getChunkSize(); System.out.println("chunk size for temporary lob: " + chunkSize); byte[] buffer = new byte[ chunkSize ]; Arrays.fill( buffer, 0, chunkSize, (byte)'b' ); Then we initialize the OutputStream. In 10g, the standard method in the Clob interface works. In 9i, you have to use the Oracle extension method getAsciiOutputStream() in the CLOB interface: out = tempClob.setAsciiStream( 0L ); // In 9i, you would have to use the following method instead // of setAsciiStream() // out = tempClob.getAsciiOutputStream(); We go in a loop and write data equal to ten chunks. Subsequently, we use the method setClob() to set the temporary CLOB value and insert it into the table: for( int i=0; i < 10; i++ ) { out.write( buffer, 0, chunkSize ); } pstmt = conn.prepareStatement( insertStmt ); pstmt.setString( 1, "Using temporary clob" ); pstmt.setInt( 2, 4 ); pstmt.setClob( 3, tempClob ); pstmt.executeUpdate(); } finally { try { if( out != null ) out.close(); if( ( tempClob != null ) ) CLOB.freeTemporary( tempClob ); } catch (Exception e) { e.printStackTrace(); } JDBCUtil.close( pstmt); } } }// end of program Notice how we use the freeTemporary() method in the finally clause to free the temporary CLOB.
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CHAPTER 12 USING LOBs AND BFILEs
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Alternatives to BFILEs for File Operations
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You ve seen how you can read from a file (text or binary) using a BFILE in PL/SQL or JDBC. You can also use a BFILE along with the DBMS_LOB package to load a text or binary file directly into a CLOB or BLOB and access them from PL/SQL or JDBC. There are two alternatives to using a BFILE for file manipulations: Use the UTL_FILE package. The first alternative is to use the supplied PL/SQL package UTL_FILE to read from and write to a text or binary file accessible on a database server (remember, BFILEs do not allow you to write to a file; you can use the UTL_FILE package to work around that). Use external tables. The second alternative that allows you to read from an operating system text file directly using select statements is to use external tables. Note that you can only do a read using this alternative, and that too only on text files. Both alternatives are Oracle-specific solutions and fall outside the scope of the JDBC API. However, since they form an alternative to the actual problem of file operations being achieved by the BFILE, I mention them briefly here.
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