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annotate example/SQLImport.java @ 943:ff075ed5ce81

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author Sjoerd Mullender <sjoerd@acm.org>
date Thu, 09 Jan 2025 10:56:14 +0100 (3 months ago)
parents d416e9b6b3d0
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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 import java.io.*;
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15
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16 /**
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17 * This simple example somewhat emulates the mclient command. However in
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18 * it's simpleness it only supports SQL queries which entirely are on one line.
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19 *
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20 * This program reads a file line by line, and feeds the line into a running
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21 * Mserver5 on the localhost. Upon error, the error is reported and the program
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22 * continues reading and executing lines.
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23 * A very lousy way of implementing options is used to somewhat configure the
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24 * behaviour of the program in order to be a bit more verbose or commit after
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25 * each (successfully) executed line.
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26 *
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27 * The program uses a debuglog in which the exact conversation between the
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28 * JDBC driver and Mserver is reported. The log file is put in the current
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29 * working directory and names like monet_[unix timestamp].log
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30 *
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31 * @author Fabian Groffen
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32 */
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33
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34 public class SQLImport {
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35 public static void main(String[] args) throws Exception {
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36 if (args.length < 1) {
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37 System.out.println("synopsis: java SQLImport filename [autocommit] [verbose]");
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38 System.exit(-1);
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39 }
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40
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41 // open the file
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42 BufferedReader fr = new BufferedReader(new FileReader(args[0]));
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43
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44 // request a connection suitable for MonetDB from the driver manager
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45 // note that the database specifier is currently not implemented, for
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46 // MonetDB itself can't access multiple databases.
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47 // turn on debugging
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48 Connection con = DriverManager.getConnection("jdbc:monetdb://localhost/demo?debug=true", "monetdb", "monetdb");
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49
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50 boolean beVerbose = false;
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51 if (args.length == 3) {
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52 // turn on verbose mode
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53 beVerbose = true;
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54 }
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55 if (args.length < 2) {
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56 // disable auto commit using the driver
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57 con.setAutoCommit(false);
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58 }
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60 // get a statement to execute on
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61 Statement stmt = con.createStatement();
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62
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63 String query;
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64 for (int i = 1; (query = fr.readLine()) != null; i++) {
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65 if (beVerbose)
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66 System.out.println(query);
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67 try {
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68 // execute the query, no matter what it is
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69 stmt.execute(query);
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70 } catch (SQLException e) {
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71 System.out.println("Error on line " + i + ": " + e.getMessage());
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72 if (!beVerbose)
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73 System.out.println(query);
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74 }
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75 }
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77 // free resources, close the statement
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78 stmt.close();
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79 // close the connection with the database
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80 con.close();
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81 // close the file
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82 fr.close();
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83 }
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84 }