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annotate tests/Test_Clargequery.java @ 391:f523727db392

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Moved Java classes from packages starting with nl.cwi.monetdb.* to package org.monetdb.* This naming complies to the Java Package Naming convention as MonetDB's main website is www.monetdb.org.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 12 Nov 2020 22:02:01 +0100 (2020-11-12)
parents 54137aeb1f92
children bf9f6b6ecf40
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1 /*
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2 * This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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5 *
350
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2020 MonetDB B.V.
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7 */
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8
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9 import java.sql.*;
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10
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11 public class Test_Clargequery {
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12 public static void main(String[] args) throws Exception {
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13 Connection con1 = DriverManager.getConnection(args[0]);
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14 Statement stmt1 = con1.createStatement();
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15 ResultSet rs = null;
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16
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17 // >> true: auto commit should be on by default
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18 System.out.println("0. true\t" + con1.getAutoCommit());
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19
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20 final String query =
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21 "-- When a query larger than the send buffer is being " +
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22 "sent, a deadlock situation can occur when the server writes " +
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23 "data back, blocking because we as client are sending as well " +
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24 "and not reading. Hence, to avoid this deadlock, in JDBC a " +
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25 "separate thread is started in the background such that results " +
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26 "from the server can be read, while data is still being sent to " +
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27 "the server. To test this, we need to trigger the SendThread " +
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28 "being started, which we do with a quite large query. We " +
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29 "construct it by repeating some stupid query plus a comment " +
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30 "a lot of times. And as you're guessing by now, you're reading " +
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31 "this stupid comment that we use :)\n" +
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32 "select 1;\n";
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33
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34 int size = 1000;
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35 StringBuilder bigq = new StringBuilder(query.length() * size);
0
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36 for (int i = 0; i < size; i++) {
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37 bigq.append(query);
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38 }
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40 // test commit by checking if a change is visible in another connection
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41 try {
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42 System.out.print("1. sending");
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43 stmt1.execute(bigq.toString());
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44 int i = 1; // we skip the first "getResultSet()"
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45 while (stmt1.getMoreResults() != false) {
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46 i++;
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47 }
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48 if (stmt1.getUpdateCount() != -1) {
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49 System.out.println("found an update count for a SELECT query");
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50 throw new SQLException("boo");
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51 }
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52 if (i != size) {
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53 System.out.println("expecting " + size + " tuples, only got " + i);
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54 throw new SQLException("boo");
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55 }
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56 } catch (SQLException e) {
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57 // this means we failed (table not there perhaps?)
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58 System.out.println("FAILED :(");
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59 System.out.println("ABORTING TEST!!!");
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60 }
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62 if (rs != null)
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63 rs.close();
0
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65 con1.close();
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66 }
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67 }