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CHAPTER 12 USING LOBs AND BFILEs
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} } finally { if( out != null ) out.close(); JDBCUtil.close( pstmt); JDBCUtil.close( rset); } } After the preceding code is executed, the BLOB data changes as follows: benchmark@ORA10G> select utl_raw.cast_to_varchar2( blob_col) blob_col 2 from blob_table; BLOB_COL -------------------------------------------------------------data to overwrite existing data in the beginningine number 3. This is the final line. Notice how we overwrote the beginning of the BLOB data with our string data to overwrite existing data in the beginning.
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Appending to a BLOB
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What if we need to append data to the end of a BLOB We ve already seen how to do that for a CLOB by invoking the method dbms_lob.writeappend from JDBC. We do the same for a BLOB, with minor variations: this time, we need to pass an array of bytes using the setBytes() method of the CallableStatement object. The final method, _appendToBlob, of the class DemoBlobOperations does this: /* demos how to append to a BLOB in the database. */ private static void _appendToBlob( Connection conn ) throws SQLException, IOException { CallableStatement cstmt = null; try { Once again, we declare an anonymous PL/SQL block that takes three parameters. The first parameter is the ID of the row in the table blob_table. The second parameter is the number of bytes to append (the length of the string). And the third parameter is the string to append. Notice how we use the dbms_lob.writeappend method to accomplish our task (please see PL/SQL Packages and Types Reference [10g Release 1] for more details on this method). We set all three parameters and invoke the procedure: String stmtString = "declare " + " l_blob blob;" +
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CHAPTER 12 USING LOBs AND BFILEs
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"begin " + " select blob_col into l_blob from blob_table " + " where id = and rownum <= 1 for update;" + " dbms_lob.writeappend( l_blob, , ); " + "end;"; String newBlobData = new String("data to be appended"); byte[] byteArray = newBlobData.getBytes(); cstmt = conn.prepareCall( stmtString ); cstmt.setInt( 1, 1 ); cstmt.setInt( 2, byteArray.length ); cstmt.setBytes( 3, byteArray ); cstmt.execute(); } finally { JDBCUtil.close( cstmt); } } } After the _appendToBlob method is executed, the string data to be appended gets appended to the end of the BLOB column: benchmark@ORA10G> select utl_raw.cast_to_varchar2( blob_col) blob_col 2 from blob_table; BLOB_COL ----------------------------------------------------------------------------------------------------------------------------data to overwrite existing data in the beginning line number 3. This is the final line. data to be appended In the next section, we ll look at how to read data stored in a BFILE column.
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To demonstrate how to read BFILE data, we first create a table, bfile_table, with a column of type BFILE: benchmark@ORA10G> create table bfile_table 2 ( 3 x varchar2(30), 4 id number, 5 bfile_col bfile 6 ); Table created.
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CHAPTER 12 USING LOBs AND BFILEs
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We create the directory object as shown in earlier sections of this chapter: benchmark@ORA10G> create or replace directory my_dir as 'C:\TEMP'; Directory created. We insert the first row with bfile_col pointing to the same file, test_bfile.txt, that we used in the earlier examples. The second row inserted points to an image file called image.gif in the same directory: benchmark@ORA10G> insert into bfile_table( x, id, bfile_col ) 2 values ( 'Ascii text file', 1, bfilename( 'MY_DIR', 'test_bfile.txt' )); 1 row created. benchmark@ORA10G> insert into bfile_table( x, id, bfile_col ) 2 values ( 'Binary Gif File', 2, bfilename( 'MY_DIR', 'image.gif' )); 1 row created. benchmark@ORA10G> commit; Commit complete. The class DemoBfileOperations demonstrates how to read both the binary and text data in the table bfile_table just created. The class begins by importing requisite classes and getting a database connection: /** This program demonstrates how to read from a BFILE. * Note that BFILEs are read-only - you cannot write to * them. * 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.io.InputStream; import java.io.IOException; import java.sql.PreparedStatement; import oracle.jdbc.OracleResultSet; import oracle.sql.BFILE; import book.util.JDBCUtil; import book.util.Util; class DemoBfileOperations { public static void main(String args[]) throws Exception { Util.checkProgramUsage( args ); Connection conn = null;
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