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annotate tests/Test_Clargequery.java @ 261:d4baf8a4b43a

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Update Copyright year to 2019
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 03 Jan 2019 14:43:44 +0100 (2019-01-03)
parents c38d4eaf5479
children 4face9f42efc d479475888e3
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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 *
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d4baf8a4b43a Update Copyright year to 2019
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2019 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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04fbf3655452 Disable Class.forName("nl.cwi.monetdb.jdbc.MonetDriver"); code
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13 // Class.forName("nl.cwi.monetdb.jdbc.MonetDriver"); // not needed anymore for self registering JDBC drivers
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14 Connection con1 = DriverManager.getConnection(args[0]);
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15 Statement stmt1 = con1.createStatement();
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16 ResultSet rs = null;
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17 //DatabaseMetaData dbmd = con.getMetaData();
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19 // >> true: auto commit should be on by default
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20 System.out.println("0. true\t" + con1.getAutoCommit());
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21
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22 final String query =
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23 "-- When a query larger than the send buffer is being " +
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24 "sent, a deadlock situation can occur when the server writes " +
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25 "data back, blocking because we as client are sending as well " +
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26 "and not reading. Hence, to avoid this deadlock, in JDBC a " +
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27 "separate thread is started in the background such that results " +
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28 "from the server can be read, while data is still being sent to " +
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29 "the server. To test this, we need to trigger the SendThread " +
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30 "being started, which we do with a quite large query. We " +
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31 "construct it by repeating some stupid query plus a comment " +
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32 "a lot of times. And as you're guessing by now, you're reading " +
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33 "this stupid comment that we use :)\n" +
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34 "select 1;\n";
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35
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36 int size = 1000;
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37 StringBuffer bigq = new StringBuffer(query.length() * size);
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38 for (int i = 0; i < size; i++) {
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39 bigq.append(query);
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40 }
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41
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42 // test commit by checking if a change is visible in another connection
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43 try {
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44 System.out.print("1. sending");
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45 stmt1.execute(bigq.toString());
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46 int i = 1; // we skip the first "getResultSet()"
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47 while (stmt1.getMoreResults() != false) {
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48 i++;
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49 }
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50 if (stmt1.getUpdateCount() != -1) {
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51 System.out.println("found an update count for a SELECT query");
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52 throw new SQLException("boo");
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53 }
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54 if (i != size) {
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55 System.out.println("expecting " + size + " tuples, only got " + i);
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56 throw new SQLException("boo");
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57 }
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58 } catch (SQLException e) {
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59 // this means we failed (table not there perhaps?)
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60 System.out.println("FAILED :(");
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61 System.out.println("ABORTING TEST!!!");
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62 }
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63
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64 if (rs != null) rs.close();
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65
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66 con1.close();
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67 }
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68 }