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annotate example/SQLImport.java @ 226:5ea126405bac

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Update java examples code
author Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
date Thu, 03 May 2018 18:44:55 +0200 (2018-05-03)
parents c38d4eaf5479
children 51e886d7f3b4 acf34e20a832
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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 *
200
c38d4eaf5479 It's 2018 now.
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6 * Copyright 1997 - July 2008 CWI, August 2008 - 2018 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
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12 /**
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13 * This simple example somewhat emulates the mclient command. However in
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14 * it's simpleness it only supports SQL queries which entirely are on one line.
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15 *
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16 * This program reads a file line by line, and feeds the line into a running
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17 * Mserver on the localhost. Upon error, the error is reported and the program
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18 * continues reading and executing lines.
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19 * A very lousy way of implementing options is used to somewhat configure the
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20 * behaviour of the program in order to be a bit more verbose or commit after
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21 * each (sucessfully) executed line.
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22 *
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23 * The program uses a debuglog in which the exact conversation between the
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24 * JDBC driver and Mserver is reported. The log file is put in the current
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25 * working directory and names like monet_[unix timestamp].log
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26 *
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27 * @author Fabian Groffen
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28 */
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29
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30 public class SQLImport {
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31 public static void main(String[] args) throws Exception {
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32 if (args.length < 1) {
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33 System.out.println("synopsis: java SQLImport filename [autocommit] [verbose]");
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34 System.exit(-1);
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35 }
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36
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37 // open the file
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38 BufferedReader fr = new BufferedReader(new FileReader(args[0]));
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39
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40 // request a connection suitable for Monet from the driver manager
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41 // note that the database specifier is currently not implemented, for
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42 // Monet itself can't access multiple databases.
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43 // turn on debugging
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44 Connection con = DriverManager.getConnection("jdbc:monetdb://localhost/database?debug=true", "monetdb", "monetdb");
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45
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46 boolean beVerbose = false;
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47 if (args.length == 3) {
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48 // turn on verbose mode
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49 beVerbose = true;
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50 }
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51 if (args.length < 2) {
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52 // disable auto commit using the driver
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53 con.setAutoCommit(false);
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54 }
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56 // get a statement to execute on
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57 Statement stmt = con.createStatement();
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58
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59 String query;
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60 for (int i = 1; (query = fr.readLine()) != null; i++) {
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61 if (beVerbose) System.out.println(query);
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62 try {
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63 // execute the query, no matter what it is
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64 stmt.execute(query);
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65 } catch (SQLException e) {
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66 System.out.println("Error on line " + i + ": " + e.getMessage());
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67 if (!beVerbose) System.out.println(query);
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68 }
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69 }
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70
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71 // free resources, close the statement
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72 stmt.close();
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73 // close the connection with the database
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74 con.close();
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75 fr.close();
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76 }
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77 }