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Copy of MonetDB java directory changeset e6e32756ad31.
author Sjoerd Mullender <sjoerd@acm.org>
date Wed, 21 Sep 2016 09:34:48 +0200 (2016-09-21)
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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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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2016 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 /**
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12 * This example assumes there exists tables a and b filled with some data.
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13 * On these tables some queries are executed and the JDBC driver is tested
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14 * on it's accuracy and robustness against 'users'.
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15 *
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16 * @author Fabian Groffen
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17 */
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18 public class MJDBCTest {
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19 public static void main(String[] args) throws Exception {
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20 // make sure the driver is loaded
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21 Class.forName("nl.cwi.monetdb.jdbc.MonetDriver");
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22 // turn on debugging (disabled)
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23 //nl.cwi.monetdb.jdbc.MonetConnection.setDebug(true);
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24 Connection con = DriverManager.getConnection("jdbc:monetdb://localhost/notused", "monetdb", "monetdb");
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25 Statement st = con.createStatement();
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26 ResultSet rs;
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27
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28 rs = st.executeQuery("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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29 // get meta data and print columns with their type
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30 ResultSetMetaData md = rs.getMetaData();
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31 for (int i = 1; i <= md.getColumnCount(); i++) {
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32 System.out.print(md.getColumnName(i) + ":" +
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33 md.getColumnTypeName(i) + "\t");
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34 }
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35 System.out.println("");
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36 // print the data: only the first 5 rows, while there probably are
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37 // a lot more. This shouldn't cause any problems afterwards since the
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38 // result should get properly discarded on the next query
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39 for (int i = 0; rs.next() && i < 5; i++) {
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40 for (int j = 1; j <= md.getColumnCount(); j++) {
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41 System.out.print(rs.getString(j) + "\t");
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42 }
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43 System.out.println("");
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44 }
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45
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46 // tell the driver to only return 5 rows, it can optimize on this
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47 // value, and will not fetch any more than 5 rows.
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48 st.setMaxRows(5);
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49 // we ask the database for 22 rows, while we set the JDBC driver to
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50 // 5 rows, this shouldn't be a problem at all...
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51 rs = st.executeQuery("select * from a limit 22");
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52 // read till the driver says there are no rows left
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53 for (int i = 0; rs.next(); i++) {
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54 System.out.print("[" + rs.getString("var1") + "]");
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55 System.out.print("[" + rs.getString("var2") + "]");
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56 System.out.print("[" + rs.getInt("var3") + "]");
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57 System.out.println("[" + rs.getString("var4") + "]");
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58 }
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59
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60 // this close is not needed, should be done by next execute(Query) call
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61 // however if there can be some time between this point and the next
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62 // execute call, it is from a resource perspective better to close it.
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63 //rs.close();
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64
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65 // unset the row limit; 0 means as much as the database sends us
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66 st.setMaxRows(0);
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67 // we only ask 10 rows
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68 rs = st.executeQuery("select * from b limit 10;");
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69 // and simply print them
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70 while (rs.next()) {
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71 System.out.print(rs.getInt("rowid") + ", ");
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72 System.out.print(rs.getString("id") + ", ");
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73 System.out.print(rs.getInt("var1") + ", ");
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74 System.out.print(rs.getInt("var2") + ", ");
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75 System.out.print(rs.getString("var3") + ", ");
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76 System.out.println(rs.getString("var4"));
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77 }
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78
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79 // this close is not needed, as the Statement will close the last
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80 // ResultSet around when it's closed
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81 // again, if that can take some time, it's nicer to close immediately
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82 // the reason why these closes are commented out here, is to test if
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83 // the driver really cleans up it's mess like it should
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84 //rs.close();
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85
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86 // perform a ResultSet-less query (with no trailing ; since that should
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87 // be possible as well and is JDBC standard)
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88 // Note that this method should return the number of updated rows. This
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89 // method however always returns -1, since Monet currently doesn't
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90 // support returning the affected rows.
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91 st.executeUpdate("delete from a where var1 = 'zzzz'");
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92
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93 // closing the connection should take care of closing all generated
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94 // statements from it...
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95 // Don't forget to do it yourself if the connection is reused or much
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96 // longer alive, since the Statement object contains a lot of things
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97 // you probably want to reclaim if you don't need them anymore.
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98 //st.close();
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99 con.close();
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100 }
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101 }