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, not before. Here is a test program:

/* MySqlBlobSetBinaryStreamError.java
 - Copyright (c) 2015, HerongYang.com, All Rights Reserved.
 */
import java.io.*;
import java.sql.*;
public class MySqlBlobSetBinaryStreamError {
  public static void main(String [] args) {
    Connection con = null;
    try {
      com.mysql.jdbc.jdbc2.optional.MysqlDataSource ds 
        = new com.mysql.jdbc.jdbc2.optional.MysqlDataSource();
      ds.setServerName("localhost");
      ds.setPortNumber(3306);
      ds.setDatabaseName("HerongDB");
      ds.setUser("Herong");
      ds.setPassword("TopSecret");
      con = ds.getConnection();

// Deleting the record for re-testing
      String subject = "Test of setBinaryStream() method error";
      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 (Subject, Body) VALUES (?,?)");
      ps.setString(1, subject);
      InputStream bodyIn = 
        new FileInputStream("MySqlBlobSetBinaryStream.class");
      File fileIn = new File("MySqlBlobSetBinaryStream.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) {
      System.err.println("Exception: "+e.getMessage());
      e.printStackTrace();
    }
  }
}

The IOException is shown below. It doesn't tell you that the InputStream is closed.

C:\herong>\Progra~1\java\jdk1.8.0_45\bin\java 
   -cp .;\local\lib\mysql-connector-java-5.1.36-bin.jar 
   MySqlBlobSetBinaryStreamError

Exception: Error reading from InputStream java.io.IOException
java.sql.SQLException: Error reading from InputStream java.io.IOException
   at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:998)
   at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:937)
   at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)
   at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:872)
   at com.mysql.jdbc.PreparedStatement.readblock(...)
   ...
Caused by: java.io.IOException: Stream Closed
   at java.io.FileInputStream.readBytes(Native Method)
   at java.io.FileInputStream.read(FileInputStream.java:255)
   at com.mysql.jdbc.PreparedStatement.readblock(...)

Last update: 2015.

Table of Contents

 About This Book

 JDBC (Java Database Connectivity) Introduction

 JDK (Java SE) Installation

 Installing and Running Java DB - Derby

 Derby (Java DB) JDBC Driver

 Derby (Java DB) JDBC DataSource Objects

 Java DB (Derby) - DML Statements

 Java DB (Derby) - ResultSet Objects of Queries

 Java DB (Derby) - PreparedStatement

 MySQL Installation on Windows

 MySQL JDBC Driver (MySQL Connector/J)

 MySQL - PreparedStatement

 MySQL - Reference Implementation of JdbcRowSet

 MySQL - JBDC CallableStatement

 MySQL CLOB (Character Large Object) - TEXT

MySQL 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

 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

 Microsoft SQL Server 2005 Express Edition

 Microsoft JDBC Driver for SQL Server - sqljdbc42.jar

 Microsoft JDBC Driver - Query Statements and Result Sets

 Microsoft JDBC Driver - DatabaseMetaData Object

 Microsoft JDBC Driver - DDL Statements

 Microsoft JDBC Driver - DML Statements

 SQL Server - PreparedStatement

 SQL Server CLOB (Character Large Object) - TEXT

 SQL Server BLOB (Binary Large Object) - BLOB

 JDBC-ODBC Bridge Driver - sun.jdbc.odbc.JdbcOdbcDriver

 JDBC-ODBC Bridge Driver - Flat Text Files

 JDBC-ODBC Bridge Driver - MS Access

 JDBC-ODBC Bridge Driver - MS SQL Server

 Summary of JDBC Drivers and Database Servers

 Additional Tutorial Notes to Be Added

 Outdated Tutorials

 References

 PDF Printing Version