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CHAPTER 8 READING AND WRITING CLOBS
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// write it for display out.println(fileAsString); System.out.println("CLOB writing done."); } catch (SQLException e) { out.println("<html><head><title>Error: CLOB Example</title></head>"); out.println("<body><h3>Error="+e.getMessage()+"</h3></body></html>"); return; } finally { DatabaseUtil.close(rs); DatabaseUtil.close(stmt); DatabaseUtil.close(conn); } System.out.println("-- DisplayOracleClobServlet end --"); } public void doPost( HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doGet(request, response); } }
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8-9. How Do You Select and Display a MySQL CLOB Using a Servlet
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MySQL supports CLOB and offers four data types for using it: Type ---------TINYTEXT TEXT MEDIUMTEXT LONGTEXT Format -----------------------------------------------------A string with a maximum length of 255 characters A string with a maximum length of 65,535 characters A string with a maximum length of 16,777,215 characters A string with a maximum length of 4,294,967,295 characters
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Setting Up the MySQL Database
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This shows how to set up the MySQL database for this example: mysql> use octopus; Database changed mysql> desc DataFiles; +----------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------+-------------+------+-----+---------+-------+ | id | int(11) | | PRI | 0 | | | fileName | varchar(20) | YES | | NULL | | | fileBody | text | YES | | NULL | | +----------+-------------+------+-----+---------+-------+ 3 rows in set (0.00 sec) mysql> select * from datafiles;
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CHAPTER 8 READING AND WRITING CLOBS
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+----+----------+---------------------------------------------| id | fileName | fileBody +----+----------+---------------------------------------------| 10 | file1 | this is file1. | | | hello world. | | | This is the last line. +----+----------+---------------------------------------------| 20 | file2 | import java.util.*; | | | import java.io.*; | | | import java.sql.*; | | | | | | public class TestMySQL { | | | public static Connection getConnection() throws Exception { | | | String driver = "org.gjt.mm.mysql.Driver"; | | | String url = "jdbc:mysql://localhost/octopus"; | | | String username = "root"; | | | String password = "root"; | | | Class.forName(driver); // load MySQL driver | | | return DriverManager.getConnection(url, username, password); | | | } | | | } +----+----------+--------------------------------------------2 rows in set (0.00 sec) mysql>
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Viewing MySQL CLOB Data
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I have developed a servlet, DisplayMySqlClobServlet, that accepts the ID of a file and displays the associated file. (As you can see, the output has not been formatted, and the CLOB data has not been altered.) Run the servlet with an ID of 10, as shown in Figure 8-9, and then run the servlet with an ID of 20, as shown in Figure 8-10. Next, run the servlet with an ID of 30 (which is not in the database); if the data is not in the database, you will see the error shown in Figure 8-11.
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Figure 8-9. Viewing MySQL CLOB data using a servlet (id=10)
CHAPTER 8 READING AND WRITING CLOBS
Figure 8-10. Viewing MySQL CLOB data using a servlet (id=20)
Figure 8-11. Viewing nonexistent Oracle CLOB data using a servlet
If the database connection information is not valid (a wrong username/password or wrong database URL) or if database is not available, then you will get the error shown in Figure 8-12.
Figure 8-12. Displaying error message using a servlet
Displaying a CLOB Using a Servlet: DisplayMySqlClobServlet
The MySQL solution is identical to the Oracle solution with the exception of the getConnection() method, which returns a MySQL Connection object. You can download the complete MySQL solution from the book s Web site. This is getConnection() for the MySQL database: public static Connection getConnection() throws Exception { String driver = "org.gjt.mm.mysql.Driver"; String url = "jdbc:mysql://localhost/octopus"; String username = "root";
CHAPTER 8 READING AND WRITING CLOBS
String password = "root"; Class.forName(driver); // load MySQL driver return DriverManager.getConnection(url, username, password); }
8-10. How Do You Select and Display an Oracle CLOB (As a URL) Using a Servlet
If CLOB data (such as an RSS feed, a text r sum , or an HTML blog) is too big (more than a couple of megabytes) and is shared among many users, it is a good idea to retrieve the CLOB from the database, then create a copy of it on the server side, and finally make it URL addressable (to avoid the performance cost). Here I will provide a solution that displays a CLOB as a URL on the browser; when you click the URL (or open the URL in the browser), then you will view the CLOB. Therefore, a servlet will accept an ID of a CLOB, and then it will store the CLOB on the server as a text file and send an associated URL (of the CLOB) to the browser. To solve this problem effectively, you need to create a directory (on the Web server side) and make it URL addressable; therefore, you need to define the following two parameters (defined inside the servlet): CLOB_DIRECTORY, the directory where CLOB data will be placed as files CLOB_URL, the CLOB_DIRECTORY as a URL
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