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annotate example/SQLcopyinto.java @ 77:83aee4f60649

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Added private method sendTransactionCommand(String); to reduce duplicate code in 6 methods. Throw a SQLFeatureNotSupportedException for not implemented methods: prepareStatement(String sql, int[] columnIndexes) and prepareStatement(String sql, String[] columnNames). Rest of the changes are only layout and removal of trailing tabs.
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 15 Dec 2016 15:29:36 +0100 (2016-12-15)
parents a5a898f6886c
children f1de7262d8d9 b9b35ca2eec2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 import java.io.*;
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11 import java.util.*;
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12 import nl.cwi.monetdb.mcl.net.*;
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13 import nl.cwi.monetdb.mcl.io.*;
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14
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15 /**
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16 * This example demonstrates how the MonetDB JDBC driver can facilitate
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17 * in performing COPY INTO sequences. This is mainly meant to show how
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18 * a quick load can be performed from Java.
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19 *
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20 * @author Fabian Groffen
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21 */
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22
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23 public class SQLcopyinto {
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24 public static void main(String[] args) throws Exception {
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25 // make sure the driver is loaded
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26 Class.forName("nl.cwi.monetdb.jdbc.MonetDriver");
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27 // request a connection suitable for Monet from the driver manager
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28 // note that the database specifier is currently not implemented, for
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29 // Monet itself can't access multiple databases.
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30 // turn on debugging
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31 Connection con = DriverManager.getConnection("jdbc:monetdb://localhost/database", "monetdb", "monetdb");
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32
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33 // get a statement to execute on
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34 Statement stmt = con.createStatement();
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35
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36 String query = "CREATE TABLE example (id int, val varchar(24))";
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37 try {
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38 stmt.execute(query);
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39 } catch (SQLException e) {
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40 System.out.println(query + ": " + e.getMessage());
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41 System.exit(1);
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42 }
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43
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44 // now create a connection manually to perform a load, this can
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45 // of course also be done simultaneously with the JDBC
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46 // connection being kept connected
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47
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48 MapiSocket server = new MapiSocket();
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49
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50 server.setDatabase("database");
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51 server.setLanguage("sql");
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52
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53 try {
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54 List warning =
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55 server.connect("localhost", 50000, "monetdb", "monetdb");
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56 if (warning != null) {
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57 for (Iterator it = warning.iterator(); it.hasNext(); ) {
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58 System.out.println(it.next().toString());
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59 }
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60 }
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61
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62 BufferedMCLReader in = server.getReader();
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63 BufferedMCLWriter out = server.getWriter();
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64
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65 String error = in.waitForPrompt();
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66 if (error != null)
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67 throw new Exception(error);
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68
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69 query = "COPY INTO example FROM STDIN USING DELIMITERS ',','\\n';";
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70 // the leading 's' is essential, since it is a protocol
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71 // marker that should not be omitted, likewise the
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72 // trailing semicolon
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73 out.write('s');
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74 out.write(query);
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75 out.newLine();
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76 for (int i = 0; i < 100; i++) {
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77 out.write("" + i + ",val_" + i);
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78 out.newLine();
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79 }
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80 out.writeLine(""); // need this one for synchronisation over flush()
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81 error = in.waitForPrompt();
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82 if (error != null)
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83 throw new Exception(error);
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84 // disconnect from server
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85 server.close();
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86 } catch (IOException e) {
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87 System.err.println("unable to connect: " + e.getMessage());
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88 System.exit(-1);
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89 } catch (Exception e) {
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90 System.err.println(e.getMessage());
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91 System.exit(-1);
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92 }
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93
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94 query = "SELECT COUNT(*) FROM example";
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95 ResultSet rs = null;
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96 try {
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97 rs = stmt.executeQuery(query);
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98 } catch (SQLException e) {
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99 System.out.println(query + ": " + e.getMessage());
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100 System.exit(1);
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101 }
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102 if (rs != null && rs.next())
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103 System.out.println(rs.getString(1));
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104
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105 // free resources, close the statement
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106 stmt.close();
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107 // close the connection with the database
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108 con.close();
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109
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110 }
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111 }