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/*-------------------------------------------------------------------------
*
* Copyright (c) 2004-2008, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgjdbc/org/postgresql/test/jdbc2/CursorFetchTest.java,v 1.13 2008/01/08 06:56:30 jurka Exp $
*
*-------------------------------------------------------------------------
*/
package org.postgresql.test.jdbc2;
import java.sql.*;
import junit.framework.TestCase;
import org.postgresql.test.TestUtil;
/*
* Tests for using non-zero setFetchSize().
*/
public class CursorFetchTest extends TestCase
{
private Connection con;
public CursorFetchTest(String name)
{
super(name);
}
protected void setUp() throws Exception
{
con = TestUtil.openDB();
TestUtil.createTable(con, "test_fetch", "value integer");
con.setAutoCommit(false);
}
protected void tearDown() throws Exception
{
con.rollback();
con.setAutoCommit(true);
TestUtil.dropTable(con, "test_fetch");
TestUtil.closeDB(con);
}
protected void createRows(int count) throws Exception
{
PreparedStatement stmt = con.prepareStatement("insert into test_fetch(value) values(?)");
for (int i = 0; i < count; ++i)
{
stmt.setInt(1, i);
stmt.executeUpdate();
}
}
// Test various fetchsizes.
public void testBasicFetch() throws Exception
{
createRows(100);
PreparedStatement stmt = con.prepareStatement("select * from test_fetch order by value");
int[] testSizes = { 0, 1, 49, 50, 51, 99, 100, 101 };
for (int i = 0; i < testSizes.length; ++i)
{
stmt.setFetchSize(testSizes[i]);
assertEquals(testSizes[i], stmt.getFetchSize());
ResultSet rs = stmt.executeQuery();
assertEquals(testSizes[i], rs.getFetchSize());
int count = 0;
while (rs.next())
{
assertEquals("query value error with fetch size " + testSizes[i], count, rs.getInt(1));
++count;
}
assertEquals("total query size error with fetch size " + testSizes[i], 100, count);
}
}
// Similar, but for scrollable resultsets.
public void testScrollableFetch() throws Exception
{
createRows(100);
PreparedStatement stmt = con.prepareStatement("select * from test_fetch order by value",
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
int[] testSizes = { 0, 1, 49, 50, 51, 99, 100, 101 };
for (int i = 0; i < testSizes.length; ++i)
{
stmt.setFetchSize(testSizes[i]);
assertEquals(testSizes[i], stmt.getFetchSize());
ResultSet rs = stmt.executeQuery();
assertEquals(testSizes[i], rs.getFetchSize());
for (int j = 0; j <= 50; ++j)
{
assertTrue("ran out of rows at position " + j + " with fetch size " + testSizes[i], rs.next());
assertEquals("query value error with fetch size " + testSizes[i], j, rs.getInt(1));
}
int position = 50;
for (int j = 1; j < 100; ++j)
{
for (int k = 0; k < j; ++k)
{
if (j % 2 == 0)
{
++position;
assertTrue("ran out of rows doing a forward fetch on iteration " + j + "/" + k + " at position " + position + " with fetch size " + testSizes[i], rs.next());
}
else
{
--position;
assertTrue("ran out of rows doing a reverse fetch on iteration " + j + "/" + k + " at position " + position + " with fetch size " + testSizes[i], rs.previous());
}
assertEquals("query value error on iteration " + j + "/" + k + " with fetch size " + testSizes[i], position, rs.getInt(1));
}
}
}
}
public void testScrollableAbsoluteFetch() throws Exception
{
createRows(100);
PreparedStatement stmt = con.prepareStatement("select * from test_fetch order by value",
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
int[] testSizes = { 0, 1, 49, 50, 51, 99, 100, 101 };
for (int i = 0; i < testSizes.length; ++i)
{
stmt.setFetchSize(testSizes[i]);
assertEquals(testSizes[i], stmt.getFetchSize());
ResultSet rs = stmt.executeQuery();
assertEquals(testSizes[i], rs.getFetchSize());
int position = 50;
assertTrue("ran out of rows doing an absolute fetch at " + position + " with fetch size " + testSizes[i], rs.absolute(position + 1));
assertEquals("query value error with fetch size " + testSizes[i], position, rs.getInt(1));
for (int j = 1; j < 100; ++j)
{
if (j % 2 == 0)
position += j;
else
position -= j;
assertTrue("ran out of rows doing an absolute fetch at " + position + " on iteration " + j + " with fetchsize" + testSizes[i], rs.absolute(position + 1));
assertEquals("query value error with fetch size " + testSizes[i], position, rs.getInt(1));
}
}
}
//
// Tests for ResultSet.setFetchSize().
//
// test one:
// set fetchsize = 0
// run query (all rows should be fetched)
// set fetchsize = 50 (should have no effect)
// process results
public void testResultSetFetchSizeOne() throws Exception
{
createRows(100);
PreparedStatement stmt = con.prepareStatement("select * from test_fetch order by value");
stmt.setFetchSize(0);
ResultSet rs = stmt.executeQuery();
rs.setFetchSize(50); // Should have no effect.
int count = 0;
while (rs.next())
{
assertEquals(count, rs.getInt(1));
++count;
}
assertEquals(100, count);
}
// test two:
// set fetchsize = 25
// run query (25 rows fetched)
// set fetchsize = 0
// process results:
// process 25 rows
// should do a FETCH ALL to get more data
// process 75 rows
public void testResultSetFetchSizeTwo() throws Exception
{
createRows(100);
PreparedStatement stmt = con.prepareStatement("select * from test_fetch order by value");
stmt.setFetchSize(25);
ResultSet rs = stmt.executeQuery();
rs.setFetchSize(0);
int count = 0;
while (rs.next())
{
assertEquals(count, rs.getInt(1));
++count;
}
assertEquals(100, count);
}
// test three:
// set fetchsize = 25
// run query (25 rows fetched)
// set fetchsize = 50
// process results:
// process 25 rows. should NOT hit end-of-results here.
// do a FETCH FORWARD 50
// process 50 rows
// do a FETCH FORWARD 50
// process 25 rows. end of results.
public void testResultSetFetchSizeThree() throws Exception
{
createRows(100);
PreparedStatement stmt = con.prepareStatement("select * from test_fetch order by value");
stmt.setFetchSize(25);
ResultSet rs = stmt.executeQuery();
rs.setFetchSize(50);
int count = 0;
while (rs.next())
{
assertEquals(count, rs.getInt(1));
++count;
}
assertEquals(100, count);
}
// test four:
// set fetchsize = 50
// run query (50 rows fetched)
// set fetchsize = 25
// process results:
// process 50 rows.
// do a FETCH FORWARD 25
// process 25 rows
// do a FETCH FORWARD 25
// process 25 rows. end of results.
public void testResultSetFetchSizeFour() throws Exception
{
createRows(100);
PreparedStatement stmt = con.prepareStatement("select * from test_fetch order by value");
stmt.setFetchSize(50);
ResultSet rs = stmt.executeQuery();
rs.setFetchSize(25);
int count = 0;
while (rs.next())
{
assertEquals(count, rs.getInt(1));
++count;
}
assertEquals(100, count);
}
public void testSingleRowResultPositioning() throws Exception
{
String msg;
createRows(1);
int[] sizes = { 0, 1, 10 };
for (int i = 0; i < sizes.length; ++i)
{
Statement stmt = con.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_UPDATABLE);
stmt.setFetchSize(sizes[i]);
// Create a one row result set.
ResultSet rs = stmt.executeQuery("select * from test_fetch order by value");
msg = "before-first row positioning error with fetchsize=" + sizes[i];
assertTrue(msg, rs.isBeforeFirst());
assertTrue(msg, !rs.isAfterLast());
assertTrue(msg, !rs.isFirst());
assertTrue(msg, !rs.isLast());
msg = "row 1 positioning error with fetchsize=" + sizes[i];
assertTrue(msg, rs.next());
assertTrue(msg, !rs.isBeforeFirst());
assertTrue(msg, !rs.isAfterLast());
assertTrue(msg, rs.isFirst());
assertTrue(msg, rs.isLast());
assertEquals(msg, 0, rs.getInt(1));
msg = "after-last row positioning error with fetchsize=" + sizes[i];
assertTrue(msg, !rs.next());
assertTrue(msg, !rs.isBeforeFirst());
assertTrue(msg, rs.isAfterLast());
assertTrue(msg, !rs.isFirst());
assertTrue(msg, !rs.isLast());
rs.close();
stmt.close();
}
}
public void testMultiRowResultPositioning() throws Exception
{
String msg;
createRows(100);
int[] sizes = { 0, 1, 10, 100 };
for (int i = 0; i < sizes.length; ++i)
{
Statement stmt = con.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_UPDATABLE);
stmt.setFetchSize(sizes[i]);
ResultSet rs = stmt.executeQuery("select * from test_fetch order by value");
msg = "before-first row positioning error with fetchsize=" + sizes[i];
assertTrue(msg, rs.isBeforeFirst());
assertTrue(msg, !rs.isAfterLast());
assertTrue(msg, !rs.isFirst());
assertTrue(msg, !rs.isLast());
for (int j = 0; j < 100; ++j)
{
msg = "row " + j + " positioning error with fetchsize=" + sizes[i];
assertTrue(msg, rs.next());
assertEquals(msg, j, rs.getInt(1));
assertTrue(msg, !rs.isBeforeFirst());
assertTrue(msg, !rs.isAfterLast());
if (j == 0)
assertTrue(msg, rs.isFirst());
else
assertTrue(msg, !rs.isFirst());
if (j == 99)
assertTrue(msg, rs.isLast());
else
assertTrue(msg, !rs.isLast());
}
msg = "after-last row positioning error with fetchsize=" + sizes[i];
assertTrue(msg, !rs.next());
assertTrue(msg, !rs.isBeforeFirst());
assertTrue(msg, rs.isAfterLast());
assertTrue(msg, !rs.isFirst());
assertTrue(msg, !rs.isLast());
rs.close();
stmt.close();
}
}
// Test odd queries that should not be transformed into cursor-based fetches.
public void testInsert() throws Exception
{
// INSERT should not be transformed.
PreparedStatement stmt = con.prepareStatement("insert into test_fetch(value) values(1)");
stmt.setFetchSize(100); // Should be meaningless.
stmt.executeUpdate();
}
public void testMultistatement() throws Exception
{
// Queries with multiple statements should not be transformed.
createRows(100); // 0 .. 99
PreparedStatement stmt = con.prepareStatement("insert into test_fetch(value) values(100); select * from test_fetch order by value");
stmt.setFetchSize(10);
assertTrue(!stmt.execute()); // INSERT
assertTrue(stmt.getMoreResults()); // SELECT
ResultSet rs = stmt.getResultSet();
int count = 0;
while (rs.next())
{
assertEquals(count, rs.getInt(1));
++count;
}
assertEquals(101, count);
}
// if the driver tries to use a cursor with autocommit on
// it will fail because the cursor will disappear partway
// through execution
public void testNoCursorWithAutoCommit() throws Exception
{
createRows(10); // 0 .. 9
con.setAutoCommit(true);
Statement stmt = con.createStatement();
stmt.setFetchSize(3);
ResultSet rs = stmt.executeQuery("SELECT * FROM test_fetch ORDER BY value");
int count = 0;
while (rs.next())
{
assertEquals(count++, rs.getInt(1));
}
assertEquals(10, count);
}
public void testGetRow() throws SQLException
{
Statement stmt = con.createStatement();
stmt.setFetchSize(1);
ResultSet rs = stmt.executeQuery("SELECT 1 UNION SELECT 2 UNION SELECT 3");
int count = 0;
while (rs.next())
{
count++;
assertEquals(count, rs.getInt(1));
assertEquals(count, rs.getRow());
}
assertEquals(3, count);
}
}
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