mirror of https://github.com/gnosygnu/xowa
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174 lines
7.0 KiB
174 lines
7.0 KiB
/*
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XOWA: the XOWA Offline Wiki Application
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Copyright (C) 2012-2017 gnosygnu@gmail.com
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XOWA is licensed under the terms of the General Public License (GPL) Version 3,
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or alternatively under the terms of the Apache License Version 2.0.
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You may use XOWA according to either of these licenses as is most appropriate
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for your project on a case-by-case basis.
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The terms of each license can be found in the source code repository:
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GPLv3 License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-GPLv3.txt
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Apache License: https://github.com/gnosygnu/xowa/blob/master/LICENSE-APACHE2.txt
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*/
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package gplx.dbs;
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import gplx.String_;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.Charset;
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import java.sql.*;
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//public class Bug_Utf8 {
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// public static void main(String[] s) throws SQLException, java.io.UnsupportedEncodingException {
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// // init connection
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// Connection conn = DriverManager.getConnection
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// ( "jdbc:mysql://localhost/bug_utf8?characterEncoding=UTF8"
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//// ( "jdbc:mysql://localhost/bug_utf8?useUnicode=true&characterEncoding=UTF8&character_set_client=UTF8&character_set_database=UTF8&character_set_results=UTF8&character_set_server=UTF8&character_set_system=UTF8"
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// , "root"
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// , "mysql7760"
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//
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// );
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//
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// // retrieve resultSet
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// Statement cmd = conn.createStatement();
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// cmd.execute("select * from simple_table;");
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// ResultSet rdr = cmd.getResultSet();
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//
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// // get value
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// rdr.next();
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// String name = rdr.getNString("name");
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//
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// // output results
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// System.out.println("name=" + name + " len=" + name.getBytes().length + " 0=" + name.getBytes()[0]);
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// System.out.println("name=" + name + " len=" + name.getBytes("UTF8").length + " 0=" + name.getBytes("UTF8")[0] + " 1=" + name.getBytes("UTF8")[1]);
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//
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// Charset utf8charset = Charset.forName("UTF-8");
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// Charset iso88591charset = Charset.forName("ISO-8859-1");
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//
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// ByteBuffer inputBuffer = ByteBuffer.wrap(name.getBytes());
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//
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// // decode ISO-8559-1
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// CharBuffer data = iso88591charset.decode(inputBuffer);
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//
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// // encode UTF-8
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// ByteBuffer outputBuffer = utf8charset.encode(data);
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// byte[] outputData = outputBuffer.array();
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// name = new String(outputData, "UTF-8");
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// System.out.println("name=" + name + " len=" + name.getBytes().length + " 0=" + name.getBytes()[0]);
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// System.out.println("name=" + name + " len=" + name.getBytes("UTF8").length + " 0=" + name.getBytes("UTF8")[0] + " 1=" + name.getBytes("UTF8")[1]);
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// }
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//}
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/*
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Hi all. The topic is pretty straightforward, but I've been staring at it for quite some time.
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I'm trying to retrieve non-English characters from a MySQL database in UTF-8. In my example below, I use "à" (U+00E0: Latin Small Letter A With Grave) but I've also tried with random Japanese characters (Hex=E7A798). I'm new to java/jdbc, so I may be missing something basic, but I've searched for quite a while, and not discovered anything.
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I've made sure that my database was created in UTF-8, and that my connection is in UTF8. I've tried enabling all jdbc connection string options (see commented line below) and it makes no difference. I've also tried System.setProperty("file.encoding", "UTF-8");.
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The odd thing is that somehow the code below works when I run it from a JUnit test. (the actual results match the expected ones)
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Any help would be appreciated. Thanks in advance.
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[list]SQL to create data[/list]
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[code]
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CREATE DATABASE bug_utf8 CHARACTER SET utf8 COLLATE utf8_general_ci;
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USE bug_utf8;
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DROP TABLE IF EXISTS simple_table;
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CREATE TABLE simple_table (name varchar(255) NOT NULL);
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INSERT INTO simple_table (name) VALUES ('à');
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SELECT Hex(name) from simple_table; -- returns C3A0
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[/code]
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[list]Java code[/list]
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[code]
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import java.sql.*;
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public class Bug_Utf8 {
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public static void main(String[] s) throws SQLException, java.io.UnsupportedEncodingException {
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// init connection
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Connection conn = DriverManager.getConnection
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( "jdbc:mysql://localhost/bug_utf8?useUnicode=true&characterEncoding=UTF8"
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// ( "jdbc:mysql://localhost/bug_utf8?useUnicode=true&characterEncoding=UTF8&character_set_client=UTF8&character_set_database=UTF8&character_set_results=UTF8&character_set_server=UTF8&character_set_system=UTF8"
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, "root"
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, "yourpassword"
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);
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// retrieve resultSet
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Statement cmd = conn.createStatement();
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cmd.execute("select * from simple_table;");
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ResultSet rdr = cmd.getResultSet();
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// get value
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rdr.next();
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String name = rdr.getNString("name");
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// output results
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// actual
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System.out.println("name=" + name + " len=" + name.getBytes().length + " 0=" + name.getBytes()[0]);
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// expecting: C3 A0
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System.out.println("name=" + name + " len=" + name.getBytes("UTF8").length + " 0=" + name.getBytes("UTF8")[0] + " 1=" + name.getBytes("UTF8")[1]);
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}
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}
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[/code]
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[list]Environment Details[/list]
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OS: Windows XP SP3
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MySQL: Server version: 5.1.40-community MySQL Community Server (GPL)
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Java: java version "1.6.0_20"
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JDBC: 5.1.12
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JUnit: 4_4.5 v20090824
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IDE: Eclipse 20090920-1017 (not that it should matter)
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*/
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import java.sql.*;
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public class Bug_Utf8 {
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public static void main(String[] args) throws Exception {
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Like();
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}
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public static void Utf8() throws Exception {
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Class.forName("org.sqlite.JDBC");
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Connection conn = DriverManager.getConnection("jdbc:sqlite:test.db");
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Statement stat = conn.createStatement();
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stat.executeUpdate("drop table if exists people;");
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stat.executeUpdate("create table people (name, occupation);");
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PreparedStatement prep = conn.prepareStatement("insert into people values (?, ?);");
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prep.setString(1, "Gandhi");
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prep.setString(2, "politics");
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prep.addBatch();
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prep.setString(1, "Turing");
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prep.setString(2, "computers");
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prep.addBatch();
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prep.setString(1, "Wittgenstein");
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prep.setString(2, "smartypants");
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prep.addBatch();
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conn.setAutoCommit(false);
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prep.executeBatch();
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conn.setAutoCommit(true);
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ResultSet rs = stat.executeQuery("select * from people;");
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while (rs.next()) {
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System.out.println("name = " + rs.getString("name"));
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System.out.println("job = " + rs.getString("occupation"));
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}
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rs.close();
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conn.close();
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}
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private static void Like() throws Exception {
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Class.forName("org.sqlite.JDBC");
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Connection conn = DriverManager.getConnection("jdbc:sqlite:C:/xowa/wiki/en.wikipedia.org/en.wikipedia.org-xtn.search.link-title-ns.000-db.001.xowa");
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conn.createStatement().execute("ATTACH DATABASE 'C:\\xowa\\wiki\\en.wikipedia.org\\en.wikipedia.org-core.xowa' AS page_db");
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conn.createStatement().execute("ATTACH DATABASE 'C:\\xowa\\wiki\\en.wikipedia.org\\en.wikipedia.org-xtn.search.core.xowa' AS word_db");
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String sql = "SELECT * FROM word_db.search_word INDEXED BY temp WHERE word_text LIKE 'bug%' AND link_score_max > 0 AND link_score_min < 1000000 LIMIT 1";
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PreparedStatement stat = conn.prepareStatement(sql);
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ResultSet rs = stat.executeQuery();
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while (rs.next()) {
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System.out.println(rs.getObject(1).toString());
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}
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rs.close();
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conn.close();
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}
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} |