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annotate onclient.txt @ 927:d311affc65f0

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Stop referring to monetdb.org/bugzilla, point straight to github.
author Sjoerd Mullender <sjoerd@acm.org>
date Mon, 07 Oct 2024 13:18:07 +0200 (10 months ago)
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1 COPY ... ON CLIENT ... support in the MonetDB JDBC driver and JdbcClient program.
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3 MonetDB provides the non-standard COPY INTO statement to perform bulk inserts and
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4 retrievals, see also:
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5 https://www.monetdb.org/documentation/user-guide/sql-manual/data-loading/copy-from/
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6 https://www.monetdb.org/documentation/user-guide/sql-manual/data-loading/export_data/
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7
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8 By default, COPY INTO accesses files on the server but it also has a mode to
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9 access files on the client. This is supported by the command line tool
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10 mclient(1) and now also as an extension to the MonetDB JDBC driver.
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12 This is how it works: The JDBC client automatically announces that it is capable
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13 of file transfers. If you execute, for example,
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15 COPY INTO mytable FROM 'data.csv' ON CLIENT;
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17 the server will send a request for file 'data.csv' to the JDBC driver.
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18 By default, the JDBC driver will refuse with an error message:
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19 'No file upload handler has been registered with the JDBC driver'
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21 or in JdbcClient:
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22 'Error [42000] when opening data.csv: ON CLIENT: No file upload handler has been registered with the JDBC driver'
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24 This is for security reasons. However, you can register a callback to handle
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25 these requests from the server:
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27 Connection conn = DriverManager.getConnection(dbUrl, userName, password);
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28 MyUploader handler = new MyUploadHandler();
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29 conn.unwrap(MonetConnection.class).setUploadHandler(handler);
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30
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31 or provide the JdbcClient startup argument: --csvdir "/path/to/csvfilesdir"
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32
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33 Here, MyUploadHandler is an implementation of the interface MonetConnection.UploadHandler,
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34 which signature looks like this:
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35
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36 public interface UploadHandler {
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37 /**
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38 * Called if the server sends a request to read file data.
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39 *
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40 * Use the given handle to receive data or send errors to the server.
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41 *
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42 * @param handle Handle to communicate with the server
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43 * @param name Name of the file the server would like to read. Make sure
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44 * to validate this before reading from the file system
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45 * @param textMode Whether to open the file as text or binary data.
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46 * @param linesToSkip In text mode, number of initial lines to skip.
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47 * 0 means upload everything, 1 means skip the first line, etc.
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48 * Note: this is different from the OFFSET option of the COPY INTO,
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49 * where both 0 and 1 mean 'upload everything'
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50 * @throws IOException when I/O problem occurs
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51 */
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52 void handleUpload(Upload handle, String name, boolean textMode, long linesToSkip) throws IOException;
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53
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54 /**
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55 * Called when the upload is cancelled halfway by the server.
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56 *
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57 * The default implementation does nothing.
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58 */
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59 default void uploadCancelled() {}
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60 }
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61
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62 In your implementation of handleUpload(), you can use the 'handle' object to
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63 communicate with the server, for example:
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64
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65 - PrintStream handle.getStream() to obtain a stream object to which you can write.
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66 This is useful if you want to generate the data on the fly.
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67
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68 - void uploadFrom(InputStream stream) to have the JDBC driver read data from the
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69 stream and send it to the server as-is. For text mode uploads this means the
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70 text must be UTF-8 encoded.
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72 - void handle.uploadFrom(Reader reader) to have the JDBC driver read text from the given
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73 Reader and upload it.
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75 - void handle.uploadFrom(BufferedReader reader, long linesToSkip) to have the JDBC
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76 driver read from the given BufferedReader and upload the text, skipping the first
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77 'linesToSkip' lines. Typically you would use the value passed to handleUpload in
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78 parameter 'linesToSkip'.
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80 - void handle.sendError(String errorMessage) to refuse the upload.
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82 See also:
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83 https://www.monetdb.org/hg/monetdb-java/file/tip/src/main/java/org/monetdb/jdbc/MonetConnection.java#l3546
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85 If you use sendError() to refuse the upload, the COPY INTO statement will fail but
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86 the connection will remain usable. On the other hand, if your implementation of
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87 handleUpload throws an IOException, the connection will be closed because there
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88 is currently no way to signal errors to the server once the transfer has begun.
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90
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91 The interface for DownloadHandler is:
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92
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93 public interface DownloadHandler {
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94 /**
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95 * Called if the server sends a request to write a file.
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96 *
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97 * Use the given handle to send data or errors to the server.
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98 *
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99 * @param handle Handle to communicate with the server
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100 * @param name Name of the file the server would like to write. Make sure
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101 * to validate this before writing to the file system
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102 * @param textMode Whether this is text or binary data.
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103 * @throws IOException when I/O problem occurs
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104 */
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105 void handleDownload(Download handle, String name, boolean textMode) throws IOException;
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106 }
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108
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109 Class org.monetdb.util.FileTransferHandler provides a default implementation
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110 of both MonetConnection.UploadHandler and MonetConnection.DownloadHandler for
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111 reading from and writing to local csv files.
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112 You pass the FileTransferHandler constructor a directory name and a Charset to
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113 specify the encoding used for the data in the csv files.
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114 FileTransferHandler class is intended for situations where you do not need to
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115 generate or transform data while uploading or downloading to a file.
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116 See also:
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117 https://www.monetdb.org/hg/monetdb-java/file/tip/src/main/java/org/monetdb/util/FileTransferHandler.java#l29
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Martin van Dinther <martin.van.dinther@monetdbsolutions.com>
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