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Attached are a patch to allow the charset encoding used by the JDBC
driver to be set, and a description of said patch. Please refer to the latter for more information. William -- William Webber william@peopleweb.net.au
This commit is contained in:
Bruce Momjian
240
src/interfaces/jdbc/example/Unicode.java
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240
src/interfaces/jdbc/example/Unicode.java
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package example;
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import java.io.*;
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import java.sql.*;
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import java.util.*;
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/**
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* Test inserting and extracting Unicode-encoded strings.
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*
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* Synopsis:
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* example.Unicode <url> <user> <password>
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* where <url> must specify an existing database to which <user> and
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* <password> give access and which has UNICODE as its encoding.
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* (To create a database with UNICODE encoding, you need to compile
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* postgres with "--enable-multibyte" and run createdb with the
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* flag "-E UNICODE".)
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*
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* This test only produces output on error.
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*
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* @author William Webber <william@live.com.au>
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*/
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public class Unicode {
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/**
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* The url for the database to connect to.
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*/
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private String url;
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/**
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* The user to connect as.
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*/
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private String user;
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/**
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* The password to connect with.
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*/
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private String password;
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private static void usage() {
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log("usage: example.Unicode <url> <user> <password>");
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}
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private static void log(String message) {
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System.err.println(message);
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}
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private static void log(String message, Exception e) {
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System.err.println(message);
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e.printStackTrace();
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}
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public Unicode(String url, String user, String password) {
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this.url = url;
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this.user = user;
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this.password = password;
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}
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/**
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* Establish and return a connection to the database.
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*/
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private Connection getConnection() throws SQLException,
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ClassNotFoundException {
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Class.forName("org.postgresql.Driver");
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Properties info = new Properties();
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info.put("user", user);
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info.put("password", password);
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info.put("charSet", "utf-8");
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return DriverManager.getConnection(url, info);
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}
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/**
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* Get string representing a block of 256 consecutive unicode characters.
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* We exclude the null character, "'", and "\".
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*/
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private String getSqlSafeUnicodeBlock(int blockNum) {
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if (blockNum < 0 || blockNum > 255)
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throw new IllegalArgumentException("blockNum must be from 0 to "
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+ "255: " + blockNum);
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StringBuffer sb = new StringBuffer(256);
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int blockFirst = blockNum * 256;
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int blockLast = blockFirst + 256;
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for (int i = blockFirst; i < blockLast; i++) {
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char c = (char) i;
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if (c == '\0' || c == '\'' || c == '\\')
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continue;
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sb.append(c);
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}
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return sb.toString();
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}
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/**
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* Is the block a block of valid unicode values.
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* d800 to db7f is the "unassigned high surrogate" range.
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* db80 to dbff is the "private use" range.
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* These should not be used in actual Unicode strings;
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* at least, jdk1.2 will not convert them to utf-8.
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*/
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private boolean isValidUnicodeBlock(int blockNum) {
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if (blockNum >= 0xd8 && blockNum <= 0xdb)
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return false;
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else
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return true;
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}
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/**
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* Report incorrect block retrieval.
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*/
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private void reportRetrievalError(int blockNum, String block,
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String retrieved) {
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String message = "Block " + blockNum + " returned incorrectly: ";
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int i = 0;
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for (i = 0; i < block.length(); i++) {
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if (i >= retrieved.length()) {
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message += "too short";
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break;
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} else if (retrieved.charAt(i) != block.charAt(i)) {
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message +=
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"first changed character at position " + i + ", sent as 0x"
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+ Integer.toHexString((int) block.charAt(i))
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+ ", retrieved as 0x"
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+ Integer.toHexString ((int) retrieved.charAt(i));
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break;
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}
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}
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if (i >= block.length())
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message += "too long";
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log(message);
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}
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/**
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* Do the testing.
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*/
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public void runTest() {
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Connection connection = null;
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Statement statement = null;
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int blockNum = 0;
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final int CREATE = 0;
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final int INSERT = 1;
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final int SELECT = 2;
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final int LIKE = 3;
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int mode = CREATE;
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try {
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connection = getConnection();
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statement = connection.createStatement();
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statement.executeUpdate("CREATE TABLE test_unicode "
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+ "( blockNum INT PRIMARY KEY, "
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+ "block TEXT );");
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mode = INSERT;
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for (blockNum = 0; blockNum < 256; blockNum++) {
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if (isValidUnicodeBlock(blockNum)) {
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String block = getSqlSafeUnicodeBlock(blockNum);
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statement.executeUpdate
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("INSERT INTO test_unicode VALUES ( " + blockNum
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+ ", '" + block + "');");
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}
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}
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mode = SELECT;
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for (blockNum = 0; blockNum < 256; blockNum++) {
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if (isValidUnicodeBlock(blockNum)) {
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String block = getSqlSafeUnicodeBlock(blockNum);
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ResultSet rs = statement.executeQuery
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("SELECT block FROM test_unicode WHERE blockNum = "
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+ blockNum + ";");
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if (!rs.next())
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log("Could not retrieve block " + blockNum);
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else {
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String retrieved = rs.getString(1);
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if (!retrieved.equals(block)) {
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reportRetrievalError(blockNum, block, retrieved);
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}
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}
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}
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}
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mode = LIKE;
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for (blockNum = 0; blockNum < 256; blockNum++) {
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if (isValidUnicodeBlock(blockNum)) {
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String block = getSqlSafeUnicodeBlock(blockNum);
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String likeString = "%" +
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block.substring(2, block.length() - 3) + "%" ;
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ResultSet rs = statement.executeQuery
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("SELECT blockNum FROM test_unicode WHERE block LIKE '"
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+ likeString + "';");
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if (!rs.next())
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log("Could get block " + blockNum + " using LIKE");
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}
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}
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} catch (SQLException sqle) {
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switch (mode) {
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case CREATE:
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log("Exception creating database", sqle);
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break;
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case INSERT:
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log("Exception inserting block " + blockNum, sqle);
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break;
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case SELECT:
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log("Exception selecting block " + blockNum, sqle);
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break;
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case LIKE:
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log("Exception doing LIKE on block " + blockNum, sqle);
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break;
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default:
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log("Exception", sqle);
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break;
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}
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} catch (ClassNotFoundException cnfe) {
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log("Unable to load driver", cnfe);
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return;
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}
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try {
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if (statement != null)
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statement.close();
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if (connection != null)
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connection.close();
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} catch (SQLException sqle) {
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log("Exception closing connections", sqle);
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}
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if (mode > CREATE) {
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// If the backend gets what it regards as garbage on a connection,
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// that connection may become unusable. To be safe, we create
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// a fresh connection to delete the table.
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try {
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connection = getConnection();
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statement = connection.createStatement();
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statement.executeUpdate("DROP TABLE test_unicode;");
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} catch (Exception sqle) {
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log("*** ERROR: unable to delete test table "
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+ "test_unicode; must be deleted manually", sqle);
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}
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}
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}
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public static void main(String [] args) {
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if (args.length != 3) {
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usage();
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System.exit(1);
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}
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new Unicode(args[0], args[1], args[2]).runTest();
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}
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}
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