Closing InputStream Too Early on setBinaryStream()

This section describes an error condition where executeUpdate() gives an exception if the InputStream is closed too early.

The program in the previous tutorial worked nicely. But if you make a mistake by placing the bodyIn.close() statement before ps.executeUpdate(), you will get an IOException when ps.executeUpdate() is called. The reason is simple, reading of binary data from the InputStream is done at the time of executeUpdate() call. Here is a test program:

/* OracleBlobSetBinaryStreamError.java
 * Copyright (c) HerongYang.com. All Rights Reserved.
 */
import java.io.*;
import java.sql.*;
public class OracleBlobSetBinaryStreamError {
  public static void main(String [] args) {
    Connection con = null;
    try {
      oracle.jdbc.pool.OracleDataSource ds
        = new oracle.jdbc.pool.OracleDataSource();
      ds.setDriverType("thin");
      ds.setServerName("localhost");
      ds.setPortNumber(1521);
      ds.setDatabaseName("XE");
      ds.setUser("Herong");
      ds.setPassword("TopSecret");
      con = ds.getConnection();

// Deleting the record for re-testing
      String subject = "Error test of setBinaryStream() method";
      Statement sta = con.createStatement();
      sta.executeUpdate("DELETE FROM Image WHERE Subject = '"
        +subject+"'");

// Inserting CLOB value with PreparedStatement.setBinaryStream()
      PreparedStatement ps = con.prepareStatement(
        "INSERT INTO Image (ID, Subject, Body) VALUES (4,?,?)");
      ps.setString(1, subject);
      InputStream bodyIn =
        new FileInputStream("OracleBlobSetBinaryStreamError.class");
      File fileIn = new File("OracleBlobSetBinaryStreamError.class");
      ps.setBinaryStream(2, bodyIn, (int) fileIn.length());

// Error - Closing the InputStream too early.
      bodyIn.close();

      int count = ps.executeUpdate();
      ps.close();

// Retrieving BLOB value with getBytes()
      sta = con.createStatement();
      ResultSet res = sta.executeQuery("SELECT * FROM Image"
        +" WHERE Subject = '"+subject+"'");
      res.next();
      System.out.println("The inserted record: ");
      System.out.println("   Subject = "+res.getString("Subject"));
      System.out.println("   Body = "
        +new String(res.getBytes("Body"),0,32));
      res.close();

      sta.close();
      con.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

Surprisingly, this program works with newer versions of JDBC driver. Somehow it does not care when the InputStrean object is closed.

herong> java -cp .;ojdbc11.jar OracleBlobSetBinaryStreamError

The inserted record:
   Subject = Error test of setBinaryStream() method
   Body = ????   4 ?
 : G H
 ? I
 ? J

When executing the same program with JDK 1.6, Oracle 10.2 and ojdbc14.jar, I did get the expected exception:

herong> Progra~1\java\jdk1.6.0_2\bin\java \
   -cp .;ojdbc14.jar OracleBlobSetBinaryStreamError

Exception: Io exception: Read error
java.sql.SQLException: Io exception: Read error
  at oracle.jdbc.driver.DatabaseError.throwSqlException(
    DatabaseError.java:...)
  at oracle.jdbc.driver.T4CPreparedStatement.executeForRows(
    T4CPreparedStatement.java:988)
  at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(
    OracleStatement.java:1170)
  at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(
    OraclePreparedStatement.java:3339)
  at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(
    OraclePreparedStatement.java:3423)
  at OracleBlobSetBinaryStreamError.main(
    OracleBlobSetBinaryStreamError.java:39)

Table of Contents

 About This Book

 JDBC (Java Database Connectivity) Introduction

 JDK (Java SE) Installation

 Oracle Express Edition Installation on Windows

 Oracle JDBC Drivers

 Oracle - Reference Implementation of JdbcRowSet

 Oracle - PreparedStatement

 Oracle - JBDC CallableStatement

 Oracle CLOB (Character Large Object) - TEXT

Oracle BLOB (Binary Large Object) - BLOB

 Overview of BLOB (Binary Large Object)

 Create Tables with CLOB Columns

 Inserting BLOB Values with SQL INSERT Statements

 Inserting BLOB Values with setBytes() Method

 Inserting BLOB Values with setBinaryStream() Method

Closing InputStream Too Early on setBinaryStream()

 Retrieving BLOB Values with getBytes() Method

 Retrieving BLOB Values with getBinaryStream() Method

 Retrieving BLOB Values with getBlob() Method

 Inserting BLOB Values with setBlob() Method

 Copying BLOB Values to New Rows

 Archived Tutorials

 References

 Full Version in PDF/EPUB