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CHAPTER 13 PASSING INPUT PARAMETERS TO PREPAREDSTATEMENT
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catch(Exception e){ e.printStackTrace(); System.exit(1); } finally { // release database resources DatabaseUtil.close(pstmt); DatabaseUtil.close(conn); } } }
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Setting Up the Data File
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I will use the binary tomcat_logo.gif file (1,934 bytes) and the binary tomcat_f14.gif file (37,454 bytes) as inputs to the program. Figure 13-1 shows the file thumbnails, and Figure 13-2 shows the files and their associated sizes.
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Figure 13-1. Binary files to be inserted as a binary stream
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Figure 13-2. Binary files and their associated sizes
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CHAPTER 13 PASSING INPUT PARAMETERS TO PREPAREDSTATEMENT
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Running the Solution for the Oracle Database
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This shows how to run the solution for the Oracle database: $ javac Demo_PreparedStatement_SetBinaryStream.java $ java Demo_PreparedStatement_SetBinaryStream oracle id-100 \ c:/temp/tomcat/tomcat_logo.gif c:/temp/tomcat/tomcat_f14.gif --Demo_PreparedStatement_setBinaryStream begin-conn=oracle.jdbc.driver.OracleConnection@d251a3 --------------rowCount=1 --Demo_PreparedStatement_setBinaryStream_Oracle end--
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Viewing the Oracle Database After Running the Solution
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To verify that you have inserted the binary data correctly, use a small Java program to display the binary data inserted: java DemoDisplayBinary oracle id-100
Running the program generates the image shown in Figure 13-3.
Figure 13-3. Retrieving the binary data from the database
Here is a program to display binary data: import import import import import import javax.swing.*; java.awt.*; java.awt.event.*; java.util.*; java.io.*; java.sql.*;
import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; /** * This class displays binary objects in a JFrame */ public class DemoDisplayBinary extends JPanel { /** * Constructor to display BLOB object. * @param dbVendor database vendor.
CHAPTER 13 PASSING INPUT PARAMETERS TO PREPAREDSTATEMENT
* @param id the primary key to the MyPictures table */ public DemoDisplayBinary(String dbVendor, String id) throws Exception { // materialize BLOB onto client Object[] binaryData = getBinaryData(dbVendor, id); setLayout(new GridLayout(1, 2)); ImageIcon icon1 = new ImageIcon((byte[])binaryData[0]) ; JLabel photoLabel1 = new JLabel(icon1) ; add(photoLabel1); ImageIcon icon2 = new ImageIcon((byte[])binaryData[1]) ; JLabel photoLabel2 = new JLabel(icon2) ; add(photoLabel2); } /** * Extract and return the BLOB object. * @param dbVendor database vendor. * @param id the primary key to the BLOB object. */ public static Object[] getBinaryData(String dbVendor, String id) throws Exception { Connection conn = null ; ResultSet rs = null; PreparedStatement pstmt = null; String query = "SELECT raw_column, long_raw_column "+ "FROM binary_table WHERE id = "; try { conn = VeryBasicConnectionManager.getConnection(dbVendor); Object[] results = new Object[2]; pstmt = conn.prepareStatement(query) ; pstmt.setString(1, id); rs = pstmt.executeQuery(); rs.next(); // materialize binary data onto client results[0] = rs.getBytes("RAW_COLUMN"); results[1] = rs.getBytes("LONG_RAW_COLUMN"); return results; } finally { DatabaseUtil.close(rs); DatabaseUtil.close(pstmt); DatabaseUtil.close(conn); } } public static void main(String args[]) throws Exception { String dbVendor = args[0]; // { "mysql", "oracle" } String id = args[1]; UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel") ; JFrame frame = new JFrame("Binary Demo for" + dbVendor + " Database"); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } });
CHAPTER 13 PASSING INPUT PARAMETERS TO PREPAREDSTATEMENT
frame.setContentPane(new DemoDisplayBinary(dbVendor, id)) ; frame.pack(); frame.setVisible(true); } }
Setting Up the MySQL Database
Using MySQL, define a table that has BLOB and MEDIUMBLOB types, as shown next. A BLOB column can hold a maximum length of 65,535 (2^16 - 1) characters, and a MEDIUMBLOB column can hold a maximum length of 16,777,215 (2^24 - 1) characters. mysql> create table binary_table( -> id VARCHAR(12), -> raw_column BLOB, -> long_raw_column MEDIUMBLOB); Query OK, 0 rows affected (0.04 sec) mysql> desc binary_table; +-----------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-----------------+-------------+------+-----+---------+-------+ | id | varchar(12) | YES | | NULL | | | raw_column | blob | YES | | NULL | | | long_raw_column | mediumblob | YES | | NULL | | +-----------------+-------------+------+-----+---------+-------+ 3 rows in set (0.01 sec)
Setting Up the Data File
I will use the binary files anna-1.jpg (5,789 bytes) and anna-2.jpg (112,375 bytes) as input to the program. Figure 13-4 shows the file thumbnails, and Figure 13-5 shows the files and their associated sizes.
Figure 13-4. Binary files to be inserted as a binary stream
CHAPTER 13 PASSING INPUT PARAMETERS TO PREPAREDSTATEMENT
Figure 13-5. Binary files and their associated sizes
Running the Solution for the MySQL Database
This shows how to run the solution for the MySQL database: $ javac Demo_PreparedStatement_SetBinaryStream.java $ java Demo_PreparedStatement_SetBinaryStream mysql id-100 c:/temp/anna/anna-1.jpg c:/temp/anna/anna-2.jpg --Demo_PreparedStatement_setBinaryStream_MySQL begin-conn=com.mysql.jdbc.Connection@15c7850 --------------rowCount=1 --Demo_PreparedStatement_setBinaryStream_MySQL end--
Viewing the MySQL Database After Running the Solution
To verify that you have inserted the binary data correctly, you can use a small Java program to display the binary data inserted: java DemoDisplayBinary mysql id-100
This generates the image shown in Figure 13-6 (I have made the image smaller to fit the page).
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