blobtest.java

开发MySql数据库的最新JDBC驱动。

/*
 Copyright (C) 2002-2004 MySQL AB

 This program is free software; you can redistribute it and/or modify
 it under the terms of version 2 of the GNU General Public License as 
 published by the Free Software Foundation.

 There are special exceptions to the terms and conditions of the GPL 
 as it is applied to this software. View the full text of the 
 exception in file EXCEPTIONS-CONNECTOR-J in the directory of this 
 software distribution.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



 */
package testsuite.simple;

import testsuite.BaseTestCase;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;

/**
 * Tests BLOB functionality in the driver.
 * 
 * @author Mark Matthews
 * @version $Id: BlobTest.java 4312 2005-09-26 19:31:34Z mmatthews $
 */
public class BlobTest extends BaseTestCase {
	// ~ Static fields/initializers
	// ---------------------------------------------

	private static File testBlobFile;

	// ~ Constructors
	// -----------------------------------------------------------

	/**
	 * Creates a new BlobTest object.
	 * 
	 * @param name
	 *            the test to run
	 */
	public BlobTest(String name) {
		super(name);
	}

	// ~ Methods
	// ----------------------------------------------------------------

	/**
	 * Runs all test cases in this test suite
	 * 
	 * @param args
	 */
	public static void main(String[] args) {
		junit.textui.TestRunner.run(BlobTest.class);
	}

	/**
	 * Setup the test case
	 * 
	 * @throws Exception
	 *             if an error occurs
	 */
	public void setUp() throws Exception {
		super.setUp();

		if (versionMeetsMinimum(4, 0)) {
			int requiredSize = 32 * 1024 * 1024;

			if (testBlobFile == null || testBlobFile.length() != requiredSize) {
				createBlobFile(requiredSize);
			}

		} else {
			int requiredSize = 8 * 1024 * 1024;

			if (testBlobFile == null || testBlobFile.length() != requiredSize) {
				createBlobFile(requiredSize);
			}
		}

		createTestTable();
	}

	/**
	 * Destroy resources created by test case
	 * 
	 * @throws Exception
	 *             if an error occurs
	 */
	public void tearDown() throws Exception {
		try {
			this.stmt.executeUpdate("DROP TABLE IF EXISTS BLOBTEST");
		} finally {
			super.tearDown();
		}
	}

	public void testByteStreamInsert() throws Exception {
		testByteStreamInsert(this.conn);
	}
	/**
	 * Tests inserting blob data as a stream
	 * 
	 * @throws Exception
	 *             if an error occurs
	 */
	private void testByteStreamInsert(Connection c) throws Exception {
		BufferedInputStream bIn = new BufferedInputStream(new FileInputStream(
				testBlobFile));
		this.pstmt = c
				.prepareStatement("INSERT INTO BLOBTEST(blobdata) VALUES (?)");
		this.pstmt.setBinaryStream(1, bIn, (int) testBlobFile.length());
		this.pstmt.execute();

		this.pstmt.clearParameters();
		doRetrieval();
	}

	private boolean checkBlob(byte[] retrBytes) throws Exception {
		boolean passed = false;
		BufferedInputStream bIn = new BufferedInputStream(new FileInputStream(
				testBlobFile));

		try {
			int fileLength = (int) testBlobFile.length();
			if (retrBytes.length == fileLength) {
				for (int i = 0; i < fileLength; i++) {
					byte fromFile = (byte) (bIn.read() & 0xff);

					if (retrBytes[i] != fromFile) {
						passed = false;
						System.out.println("Byte pattern differed at position "
								+ i + " , " + retrBytes[i] + " != " + fromFile);

						for (int j = 0; (j < (i + 10)) /* && (j < i) */; j++) {
							System.out.print(Integer
									.toHexString(retrBytes[j] & 0xff)
									+ " ");
						}

						break;
					}

					passed = true;
				}
			} else {
				passed = false;
				System.out.println("retrBytes.length(" + retrBytes.length
						+ ") != testBlob.length(" + fileLength + ")");
			}

			return passed;
		} finally {
			if (bIn != null) {
				bIn.close();
			}
		}
	}

	private void createTestTable() throws Exception {
		//
		// Catch the error, the table might exist
		//
		try {
			this.stmt.executeUpdate("DROP TABLE BLOBTEST");
		} catch (SQLException SQLE) {
			;
		}

		this.stmt
				.executeUpdate("CREATE TABLE BLOBTEST (pos int PRIMARY KEY auto_increment, "
						+ "blobdata LONGBLOB)");
	}

	/**
	 * Mark this as deprecated to avoid warnings from compiler...
	 * 
	 * @deprecated
	 * 
	 * @throws Exception
	 *             if an error occurs retrieving the value
	 */
	private void doRetrieval() throws Exception {
		boolean passed = false;
		this.rs = this.stmt
				.executeQuery("SELECT blobdata from BLOBTEST LIMIT 1");
		this.rs.next();

		byte[] retrBytes = this.rs.getBytes(1);
		passed = checkBlob(retrBytes);
		assertTrue(
				"Inserted BLOB data did not match retrieved BLOB data for getBytes().",
				passed);
		retrBytes = this.rs.getBlob(1).getBytes(1L,
				(int) this.rs.getBlob(1).length());
		passed = checkBlob(retrBytes);
		assertTrue(
				"Inserted BLOB data did not match retrieved BLOB data for getBlob().",
				passed);

		InputStream inStr = this.rs.getBinaryStream(1);
		ByteArrayOutputStream bOut = new ByteArrayOutputStream();
		int b;

		while ((b = inStr.read()) != -1) {
			bOut.write((byte) b);
		}

		retrBytes = bOut.toByteArray();
		passed = checkBlob(retrBytes);
		assertTrue(
				"Inserted BLOB data did not match retrieved BLOB data for getBinaryStream().",
				passed);
		inStr = this.rs.getAsciiStream(1);
		bOut = new ByteArrayOutputStream();

		while ((b = inStr.read()) != -1) {
			bOut.write((byte) b);
		}

		retrBytes = bOut.toByteArray();
		passed = checkBlob(retrBytes);
		assertTrue(
				"Inserted BLOB data did not match retrieved BLOB data for getAsciiStream().",
				passed);
		inStr = this.rs.getUnicodeStream(1);
		bOut = new ByteArrayOutputStream();

		while ((b = inStr.read()) != -1) {
			bOut.write((byte) b);
		}

		retrBytes = bOut.toByteArray();
		passed = checkBlob(retrBytes);
		assertTrue(
				"Inserted BLOB data did not match retrieved BLOB data for getUnicodeStream().",
				passed);
	}

	private void createBlobFile(int size) throws Exception {
		if (testBlobFile != null && testBlobFile.length() != size) {
			testBlobFile.delete();
		}

		testBlobFile = File.createTempFile("testblob", ".dat");
		testBlobFile.deleteOnExit();

		BufferedOutputStream bOut = new BufferedOutputStream(
				new FileOutputStream(testBlobFile));

		int dataRange = Byte.MAX_VALUE - Byte.MIN_VALUE;

		for (int i = 0; i < size; i++) {
			bOut.write((byte) ((Math.random() * dataRange) + Byte.MIN_VALUE));
		}

		bOut.flush();
		bOut.close();
	}
}