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Adjust getTableTypes() test for new table type: LOCAL TEMPORARY VIEW, added in 11.53.4 (Mar2025-SP1)
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 03 Apr 2025 15:01:33 +0200 (3 days ago)
parents d416e9b6b3d0
children
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1 /*
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2 * SPDX-License-Identifier: MPL-2.0
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3 *
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4 * This Source Code Form is subject to the terms of the Mozilla Public
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5 * License, v. 2.0. If a copy of the MPL was not distributed with this
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6 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
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7 *
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8 * Copyright 2024, 2025 MonetDB Foundation;
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9 * Copyright August 2008 - 2023 MonetDB B.V.;
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10 * Copyright 1997 - July 2008 CWI.
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11 */
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12
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13 import java.sql.*;
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14
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15 /**
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16 * This example assumes there exists tables a and b filled with some data.
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17 * On these tables some queries are executed and the JDBC driver is tested
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18 * on it's accuracy and robustness against 'users'.
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19 *
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20 * @author Fabian Groffen
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21 */
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22 public class MJDBCTest {
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23 public static void main(String[] args) throws Exception {
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24 String MonetDB_JDBC_URL = "jdbc:monetdb://localhost:50000/demo"; // change host, port and databasename
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25 Connection con = null;
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26 try {
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27 con = DriverManager.getConnection(MonetDB_JDBC_URL, "monetdb", "monetdb");
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28 } catch (SQLException e) {
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29 System.err.println("Failed to connect to MonetDB server! Message: " + e.getMessage());
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30 }
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31
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32 if (con == null) {
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33 System.err.println("Failed to create a connection object!");
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34 return;
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35 }
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36
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37 Statement st = con.createStatement();
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38 ResultSet rs;
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39
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40 String sql = "SELECT a.var1, COUNT(b.id) as total FROM a, b WHERE a.var1 = b.id AND a.var1 = 'andb' GROUP BY a.var1 ORDER BY a.var1, total;";
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41 rs = st.executeQuery(sql);
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42 // get meta data and print columns with their type
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43 ResultSetMetaData md = rs.getMetaData();
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44 for (int i = 1; i <= md.getColumnCount(); i++) {
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45 System.out.print(md.getColumnName(i) + ":" +
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46 md.getColumnTypeName(i) + "\t");
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47 }
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48 System.out.println("");
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49 // print the data: only the first 5 rows, while there probably are
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50 // a lot more. This shouldn't cause any problems afterwards since the
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51 // result should get properly discarded on the next query
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52 for (int i = 0; rs.next() && i < 5; i++) {
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53 for (int j = 1; j <= md.getColumnCount(); j++) {
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54 System.out.print(rs.getString(j) + "\t");
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55 }
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56 System.out.println("");
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57 }
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58
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59 // tell the driver to only return 5 rows, it can optimize on this
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60 // value, and will not fetch any more than 5 rows.
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61 st.setMaxRows(5);
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62 // we ask the database for 22 rows, while we set the JDBC driver to
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63 // 5 rows, this shouldn't be a problem at all...
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64 rs = st.executeQuery("select * from a limit 22");
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65 int var1_cnr = rs.findColumn("var1");
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66 int var2_cnr = rs.findColumn("var2");
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67 int var3_cnr = rs.findColumn("var3");
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68 int var4_cnr = rs.findColumn("var4");
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69 // read till the driver says there are no rows left
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70 for (int i = 0; rs.next(); i++) {
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71 System.out.println(
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72 "[" + rs.getString(var1_cnr) + "]" +
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73 "[" + rs.getString(var2_cnr) + "]" +
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74 "[" + rs.getInt(var3_cnr) + "]" +
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75 "[" + rs.getString(var4_cnr) + "]" );
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76 }
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77
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78 // this rs.close is not needed, should be done by next execute(Query) call
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79 // however if there can be some time between this point and the next
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80 // execute call, it is from a resource perspective better to close it.
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81 rs.close();
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82
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83 // unset the row limit; 0 means as much as the database sends us
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84 st.setMaxRows(0);
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85 // we only ask 10 rows
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86 rs = st.executeQuery("select * from b limit 10;");
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87 int rowid_cnr = rs.findColumn("rowid");
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88 int id_cnr = rs.findColumn("id");
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89 var1_cnr = rs.findColumn("var1");
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90 var2_cnr = rs.findColumn("var2");
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91 var3_cnr = rs.findColumn("var3");
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92 var4_cnr = rs.findColumn("var4");
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93 // and simply print them
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94 while (rs.next()) {
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95 System.out.println(
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96 rs.getInt(rowid_cnr) + ", " +
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97 rs.getString(id_cnr) + ", " +
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98 rs.getInt(var1_cnr) + ", " +
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99 rs.getInt(var2_cnr) + ", " +
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100 rs.getString(var3_cnr) + ", " +
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101 rs.getString(var4_cnr) );
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102 }
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103
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104 // this close is not required, as the Statement will close the last
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105 // ResultSet around when it's closed
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106 // again, if that can take some time, it's nicer to close immediately
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107 // the reason why these closes are commented out here, is to test if
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108 // the driver really cleans up it's mess like it should
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109 rs.close();
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110
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111 // perform a ResultSet-less query (with no trailing ; since that should
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112 // be possible as well and is JDBC standard)
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113 // Note that this method should return the number of updated rows. This
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114 // method however always returns -1, since Monet currently doesn't
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115 // support returning the affected rows.
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116 st.executeUpdate("delete from a where var1 = 'zzzz'");
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117
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118 // Don't forget to do it yourself if the connection is reused or much
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119 // longer alive, since the Statement object contains a lot of things
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120 // you probably want to reclaim if you don't need them anymore.
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121 st.close();
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122 // closing the connection should take care of closing all generated
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123 // statements from it...
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124 con.close();
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125 }
a5a898f6886c Copy of MonetDB java directory changeset e6e32756ad31.
Sjoerd Mullender <sjoerd@acm.org>
parents:
diff changeset
126 }