blobtest.java

来自「PostgreSQL7.4.6 for Linux」· Java 代码 · 共 291 行

package org.postgresql.test.jdbc2;

import org.postgresql.test.TestUtil;
import junit.framework.TestCase;
import java.io.*;
import java.sql.*;

import org.postgresql.largeobject.*;

/*
 * $Id: BlobTest.java,v 1.9 2003/08/15 18:45:11 barry Exp $
 *
 * Some simple tests based on problems reported by users. Hopefully these will
 * help prevent previous problems from re-occuring ;-)
 *
 */
public class BlobTest extends TestCase
{

	private Connection con;

	private static final int LOOP = 0; // LargeObject API using loop
	private static final int NATIVE_STREAM = 1; // LargeObject API using OutputStream
	private static final int JDBC_STREAM = 2; // JDBC API using OutputStream

	public BlobTest(String name)
	{
		super(name);
	}

	protected void setUp() throws Exception
	{
		con = TestUtil.openDB();
		TestUtil.createTable(con, "testblob", "id name,lo oid");
	}

	protected void tearDown() throws Exception
	{
		TestUtil.dropTable(con, "testblob");
		TestUtil.closeDB(con);
	}

	/*
	 * Tests one method of uploading a blob to the database
	 */
	public void testUploadBlob_LOOP()
	{
		try
		{
			con.setAutoCommit(false);
			assertTrue(!con.getAutoCommit());

			assertTrue(uploadFile("build.xml", LOOP) > 0);

			// Now compare the blob & the file. Note this actually tests the
			// InputStream implementation!
			assertTrue(compareBlobsLOAPI());
			assertTrue(compareBlobs());
			assertTrue(compareClobs());

			con.setAutoCommit(true);
		}
		catch (Exception ex)
		{
			fail(ex.getMessage());
		}
	}

	/*
	 * Tests one method of uploading a blob to the database
	 */
	public void testUploadBlob_NATIVE()
	{
		try
		{
			con.setAutoCommit(false);
			assertTrue(!con.getAutoCommit());

			assertTrue(uploadFile("build.xml", NATIVE_STREAM) > 0);

			// Now compare the blob & the file. Note this actually tests the
			// InputStream implementation!
			assertTrue(compareBlobs());

			con.setAutoCommit(true);
		}
		catch (Exception ex)
		{
			fail(ex.getMessage());
		}
	}

	/*
	 * Helper - uploads a file into a blob using old style methods. We use this
	 * because it always works, and we can use it as a base to test the new
	 * methods.
	 */
	private int uploadFile(String file, int method) throws Exception
	{
		LargeObjectManager lom = ((org.postgresql.PGConnection)con).getLargeObjectAPI();

		FileInputStream fis = new FileInputStream(file);

		int oid = lom.create(LargeObjectManager.READWRITE);
		LargeObject blob = lom.open(oid);

		int s, t;
		byte buf[];
		OutputStream os;

		switch (method)
		{
			case LOOP:
				buf = new byte[2048];
				t = 0;
				while ((s = fis.read(buf, 0, buf.length)) > 0)
				{
					t += s;
					blob.write(buf, 0, s);
				}
				break;

			case NATIVE_STREAM:
				os = blob.getOutputStream();
				s = fis.read();
				while (s > -1)
				{
					os.write(s);
					s = fis.read();
				}
				os.close();
				break;

			case JDBC_STREAM:
				File f = new File(file);
				PreparedStatement ps = con.prepareStatement(TestUtil.insertSQL("testblob", "?"));
				ps.setBinaryStream(1, fis, (int) f.length());
				ps.execute();
				break;

			default:
				assertTrue("Unknown method in uploadFile", false);
		}

		blob.close();
		fis.close();

		// Insert into the table
		Statement st = con.createStatement();
		st.executeUpdate(TestUtil.insertSQL("testblob", "id,lo", "'" + file + "'," + oid));
		con.commit();
		st.close();

		return oid;
	}

	/*
	 * Helper - compares the blobs in a table with a local file. Note this uses
	 * the postgresql specific Large Object API
	 */
	private boolean compareBlobsLOAPI() throws Exception
	{
		boolean result = true;

		LargeObjectManager lom = ((org.postgresql.PGConnection)con).getLargeObjectAPI();

		Statement st = con.createStatement();
		ResultSet rs = st.executeQuery(TestUtil.selectSQL("testblob", "id,lo"));
		assertNotNull(rs);

		while (rs.next())
		{
			String file = rs.getString(1);
			int oid = rs.getInt(2);

			FileInputStream fis = new FileInputStream(file);
			LargeObject blob = lom.open(oid);
			InputStream bis = blob.getInputStream();

			int f = fis.read();
			int b = bis.read();
			int c = 0;
			while (f >= 0 && b >= 0 & result)
			{
				result = (f == b);
				f = fis.read();
				b = bis.read();
				c++;
			}
			result = result && f == -1 && b == -1;

			if (!result)
				assertTrue("Large Object API Blob compare failed at " + c + " of " + blob.size(), false);

			blob.close();
			fis.close();
		}
		rs.close();
		st.close();

		return result;
	}

	/*
	 * Helper - compares the blobs in a table with a local file. This uses the 
	 * jdbc java.sql.Blob api
	 */
	private boolean compareBlobs() throws Exception
	{
		boolean result = true;

		Statement st = con.createStatement();
		ResultSet rs = st.executeQuery(TestUtil.selectSQL("testblob", "id,lo"));
		assertNotNull(rs);

		while (rs.next())
		{
			String file = rs.getString(1);
			Blob blob = rs.getBlob(2);

			FileInputStream fis = new FileInputStream(file);
			InputStream bis = blob.getBinaryStream();

			int f = fis.read();
			int b = bis.read();
			int c = 0;
			while (f >= 0 && b >= 0 & result)
			{
				result = (f == b);
				f = fis.read();
				b = bis.read();
				c++;
			}
			result = result && f == -1 && b == -1;

			if (!result)
				assertTrue("JDBC API Blob compare failed at " + c + " of " + blob.length(), false);

			bis.close();
			fis.close();
		}
		rs.close();
		st.close();

		return result;
	}

	/*
	 * Helper - compares the clobs in a table with a local file. 
	 */
	private boolean compareClobs() throws Exception
	{
		boolean result = true;

		Statement st = con.createStatement();
		ResultSet rs = st.executeQuery(TestUtil.selectSQL("testblob", "id,lo"));
		assertNotNull(rs);

		while (rs.next())
		{
			String file = rs.getString(1);
			Clob clob = rs.getClob(2);

			FileInputStream fis = new FileInputStream(file);
			InputStream bis = clob.getAsciiStream();

			int f = fis.read();
			int b = bis.read();
			int c = 0;
			while (f >= 0 && b >= 0 & result)
			{
				result = (f == b);
				f = fis.read();
				b = bis.read();
				c++;
			}
			result = result && f == -1 && b == -1;

			if (!result)
				assertTrue("Clob compare failed at " + c + " of " + clob.length(), false);

			bis.close();
			fis.close();
		}
		rs.close();
		st.close();

		return result;
	}
}