//***************************************************************************
// (c) Copyright IBM Corp. 2007 All rights reserved.
// 
// The following sample of source code ("Sample") is owned by International 
// Business Machines Corporation or one of its subsidiaries ("IBM") and is 
// copyrighted and licensed, not sold. You may use, copy, modify, and 
// distribute the Sample in any form without payment to IBM, for the purpose of 
// assisting you in the development of your applications.
// 
// The Sample code is provided to you on an "AS IS" basis, without warranty of 
// any kind. IBM HEREBY EXPRESSLY DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR 
// IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do 
// not allow for the exclusion or limitation of implied warranties, so the above 
// limitations or exclusions may not apply to you. IBM shall not be liable for 
// any damages you suffer as a result of using, copying, modifying or 
// distributing the Sample, even if IBM has been advised of the possibility of 
// such damages.
//***************************************************************************
//
// SOURCE FILE NAME: BlobClobDemo.sqlj
//
// SAMPLE: How to access Blob or Clob fields in DB2 tables
//
//         This sample program shows how to access Blob or Clob fields in 
//         DB2 tables. To access LOBs in S/390 DB2, additional auxilaiary 
//         tables and indexes need to be created on server side.
// 
//         This sample program uses the DataSource jdbc/DB2SimpleDataSource_ds1 
//         from JNDI. The DataSource is registered using createRegisterDS.java 
//         and DS1.prop. Refer to the README file for details on how to run
//         this sample. 
//
//
// SQL Statements USED:
//         SELECT
//
// Classes used from Util.sqlj are:
//         Data
//
//                           
// Output will vary depending on the JDBC driver connectivity used.
//***************************************************************************
//
// For more information on the sample programs, see the README file.
//
// For information on developing Java applications see the Developing Java Applications book.
//
// For information on using SQL statements, see the SQL Reference.
//
// For the latest information on programming, compiling, and running DB2
// applications, visit the DB2 Information Center at
//     http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/index.jsp
//**************************************************************************/


import java.sql.*;
import sqlj.runtime.*;
import sqlj.runtime.ref.*;

#sql context BlobClobCtx with (dataSource="jdbc/DB2SimpleDataSource_ds1");

class BlobClobDemo 
{
  #sql public iterator lobIter(int id, java.sql.Blob blobcol, 
                               java.sql.Clob clobcol); 

  public static void main(String argv[]) 
  {
    System.out.println();
    System.out.println(
      "THIS SAMPLE SHOWS HOW TO ACCESS BLOB OR BLOB FIELDS IN DB2 TABLES.\n");
      
    BlobClobDemo bc_o  = new BlobClobDemo();
    try
    {
      bc_o.runThis();
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
  }

  static BlobClobCtx ctx1 = null;

  public void runThis() throws SQLException
  {
    // Obtain Connection Context from DataSource jdbc/DB2SimpleDataSource_ds1
    ctx1 = new BlobClobCtx();
    
    Connection conn = ctx1.getConnection();
    conn.setAutoCommit(false);

    try
    {
      lobIter n1 = null;
      int col1 = 0;
      Blob blob = null;
      Clob clob = null;
      int id1 = 100;
      byte[] blobval1 = {(byte)0x0a, (byte)0x0b, (byte)0x0c};
      String clobval1 = "Clob Text1";
      int id2 = 200;
      byte[] blobval2 = {(byte)0x0d, (byte)0x0e, (byte)0x0f};
      String clobval2 = "Clob Text2";
      System.out.println("  Insert 2 rows into the table BlobClob_Tab. \n");

      #sql { INSERT INTO BlobClob_Tab(id, blobcol, clobcol) 
               VALUES( :id1, :blobval1, :clobval1 ) };
      System.out.println(
        "    INSERT INTO BlobClob_Tab(id, blobcol, clobcol)\n"+
        "      VALUES ( :id1, :blobval1, :clobval1 )\n");

      #sql { INSERT INTO BlobClob_Tab(id, blobcol, clobcol) 
               VALUES( :id2, :blobval2, :clobval2 ) };
      System.out.println(
        "    INSERT INTO BlobClob_Tab(id, blobcol, clobcol) \n"+
        "      VALUES ( :id2, :blobval2, :clobval2 )\n");

      System.out.println ("  Now Fetch From BlobClobTab.\n");
      #sql n1 = { select id, blobcol, clobcol from  BlobClob_Tab };
      System.out.println("    SELECT id, blobcol, clobcol FROM BlobClob_Tab\n");

      String clob_str = null;
      Clob temp_clob = null;
      Blob temp_blob = null;
          
      while (n1.next())
      {
        temp_clob = n1.clobcol();
        temp_blob = n1.blobcol();
        byte[] barr = temp_blob.getBytes(1,(int)temp_blob.length());
        clob_str = temp_clob.getSubString(1,(int)temp_clob.length());
        System.out.print("    ID = " + n1.id() + ", Clob Value = " +
                         clob_str + ", Blob Value: ");
        for (int i=0; i<barr.length; i++) 
        {
          System.out.print(""+barr[i]);
          if (i<barr.length-1) 
              System.out.print(",");
        }
        System.out.println ("");
        
      }
      System.out.println ("");

      n1.close();
      cleanup();
    }
    catch(Exception ex)
    {
      if (ex instanceof java.sql.SQLException)
      {
        System.out.println("error code: " +
                ((java.sql.SQLException)(ex)).getErrorCode());
        System.out.println("error message: " + ex.getMessage());
      }
      ex.printStackTrace();
    }
  }

  private static void  cleanup() throws SQLException
  {
    #sql [ctx1] { DELETE  FROM BlobClob_Tab WHERE 1=1 };
  }
}