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* Copyright (c) 2013, impossibl.com
* All rights reserved.
*
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* modification, are permitted provided that the following conditions are met:
*
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* be used to endorse or promote products derived from this software
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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package com.impossibl.postgres.jdbc;
import com.impossibl.postgres.utils.Timer;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.concurrent.TimeUnit;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
public class PerformanceTest {
static Connection conn;
@Before
public void setUp() throws Exception {
conn = TestUtil.openDB();
}
@After
public void tearDown() throws Exception {
TestUtil.closeDB(conn);
}
@Test
public void testPreparedStatementCache() throws SQLException {
long start = System.nanoTime();
for (int i = 0; i < 10000; i++) {
PreparedStatement prepareStatement = conn.prepareStatement("SELECT md5(?),md5(?),md5(?),md5(?),md5(?),md5(?)");
prepareStatement.setString(1, "Some text to hash");
prepareStatement.setString(2, "Some text to hash");
prepareStatement.setString(3, "Some text to hash");
prepareStatement.setString(4, "Some text to hash");
prepareStatement.setString(5, "Some text to hash");
prepareStatement.setString(6, "Some text to hash");
prepareStatement.execute();
prepareStatement.close();
}
System.out.println("Prepare: " + TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - start));
}
@Test
public void testLargeResultSet() throws Exception {
Timer timer = new Timer();
for (int c = 0; c < 100; ++c) {
try (Statement st = conn.createStatement()) {
try (ResultSet rs = st.executeQuery("SELECT id, md5(random()::text) AS descr FROM (SELECT * FROM generate_series(1,100000) AS id) AS x;")) {
while (rs.next()) {
rs.getString(1);
}
}
}
System.out.println("Query Time:" + timer.getLapSeconds());
}
}
}