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CHAPTER 12 USING LOBs AND BFILEs
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try { // get connection (autocommit is set to false) conn = JDBCUtil.getConnection("benchmark", "benchmark", args[0]); We invoke two methods: _readBfileAsBinaryData(): Demonstrates how to read the binary image from our table _readBfileAsTextData(): Demonstrates how to read the text file contents pointed to by our BFILE column Reading BFILE Data As Binary Data In the method _readBfileAsBinaryData(), we first use the getBFILE() method of the OracleResultSet object (remember that the BFILE is an Oracle-only feature; the standard JDBC API does not support this concept). We then use the getBinaryStream() method of the BFILE class to first get the InputStream. Finally, we use the Java stream functionality to extract data: /* demos how to read from a BFILE from the database as a binary file. */ private static void _readBfileAsBinaryData( Connection conn ) throws SQLException, IOException { PreparedStatement pstmt = null; OracleResultSet orset = null; InputStream in = null; BFILE bfile = null; try { String stmtString = "select bfile_col from bfile_table "+ " where id = "; pstmt = conn.prepareStatement( stmtString ); pstmt.setInt( 1, 2 ); orset = (OracleResultSet) pstmt.executeQuery(); while( orset.next() ) { bfile = orset.getBfile( 1 ); bfile.openFile(); in = bfile.getBinaryStream(); byte[] byteArray = new byte[100]; int length = -1; Next, we loop through to read chunks of 100 bytes of binary data into our byte array: int numOfBytesRead = 0; while (( length = in.read( byteArray)) != -1 ) { //System.out.println( byteArray ); numOfBytesRead += length; }
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CHAPTER 12 USING LOBs AND BFILEs
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System.out.println("binary file: num of bytes read: " + numOfBytesRead); System.out.println(""); } } finally { if( in != null ) in.close(); if( bfile != null ) bfile.closeFile(); JDBCUtil.close( pstmt); JDBCUtil.close( orset); } } Reading BFILE Data As ASCII Text Reading BFILE data as ASCII text follows the exact same procedure as presented in the previous section for reading binary data, except that we need to convert the bytes into a String before we use it in our Java code, as shown in the method _readBfileAsTextData: /* demos how to read from a BFILE from the database as an ASCII file. */ private static void _readBfileAsAsciiData( Connection conn ) throws SQLException, IOException { PreparedStatement pstmt = null; OracleResultSet orset = null; BFILE bfile = null; InputStream in = null; try { String stmtString = "select bfile_col from bfile_table "+ " where id = "; pstmt = conn.prepareStatement( stmtString ); pstmt.setInt( 1, 1 ); orset = (OracleResultSet) pstmt.executeQuery(); byte[] buffer = new byte[30]; int numOfCharacersRead = 0; int length = -1; while( orset.next() ) { bfile = orset.getBfile( 1 ); bfile.openFile(); in = bfile.getBinaryStream(); while (( length = in.read( buffer)) != -1 ) { System.out.print( new String( buffer, 0, length ) ); numOfCharacersRead += length;
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CHAPTER 12 USING LOBs AND BFILEs
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} System.out.println("\ntext file: num of chars read: " + numOfCharacersRead); } } finally { if( in != null ) in.close(); if( bfile != null ) bfile.closeFile(); JDBCUtil.close( pstmt); JDBCUtil.close( orset); } } }// end of class In the next section, we ll cover how to use temporary LOBs in JDBC. 29.380
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Now you know what temporary LOBs are and how to use them to store transient data in PL/SQL. In this section, we will create a temporary CLOB in JDBC and insert the value in a table. To create a temporary CLOB, we use the static method createTemporary() defined in the BLOB and CLOB classes. The signature of this method in the CLOB and BLOB classes is as follows: public static oracle.sql.CLOB createTemporary(Connection conn, boolean isCached, int duration) public static oracle.sql.BLOB createTemporary(Connection conn, boolean isCached, int duration) The duration must be either DURATION_SESSION or DURATION_CALL as defined in the BLOB or CLOB class. In client applications, DURATION_SESSION is appropriate. DURATION_CALL is relevant mainly in Java stored procedures. After we have finished using the temporary LOB, we should free it with the freeTemporary() method defined in BLOB and CLOB classes: public void freeTemporary() We will now create a temporary CLOB and insert it into clob_table. The following DemoTemporaryLobs class illustrates this: /** This program demonstrates how to use temporary LOBs. * We work with temporary CLOBs, though the same concepts also * apply to temporary BLOBs. * COMPATIBLITY NOTE: In 9i you have to use the method * getAsciiOutputStream() in the CLOB interface instead of the * standard setAsciiStream() method as explained in the code: */ import java.util.Arrays; import java.sql.SQLException;
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