Mercurial > dive4elements > river

annotate flys-aft/src/main/java/de/intevation/db/ConnectionBuilder.java @ 4268:f75968f0ce80

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Refactor GaugePanel and GaugeInfo to extract a base class Extract a base class from GaugePanel and GaugeInfo to reuse code for displaying the measurement station information.
author Björn Ricks <bjoern.ricks@intevation.de>
date Fri, 26 Oct 2012 12:19:54 +0200
parents ee0c60757a94
children f939e1e6cfa4
rev   line source
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Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 package de.intevation.db;
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2
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3 import de.intevation.utils.XML;
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4
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5 import java.util.HashMap;
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6
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7 import org.w3c.dom.Document;
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8
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9 import javax.xml.xpath.XPathConstants;
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10
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11 import java.sql.Connection;
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12 import java.sql.SQLException;
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13 import java.sql.DriverManager;
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14 import java.sql.DatabaseMetaData;
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15
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16 import org.apache.log4j.Logger;
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17
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18 public class ConnectionBuilder
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19 {
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20 private static Logger log = Logger.getLogger(ConnectionBuilder.class);
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21
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22 public static final String XPATH_DRIVER = "/sync/side[@name=$type]/db/driver/text()";
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23 public static final String XPATH_USER = "/sync/side[@name=$type]/db/user/text()";
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24 public static final String XPATH_PASSWORD = "/sync/side[@name=$type]/db/password/text()";
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25 public static final String XPATH_URL = "/sync/side[@name=$type]/db/url/text()";
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26
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27 protected String type;
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28 protected String driver;
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29 protected String user;
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30 protected String password;
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31 protected String url;
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32
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33 public ConnectionBuilder(String type, Document document) {
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34 this.type = type;
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35 extractCredentials(document);
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36 }
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37
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38 protected void extractCredentials(Document document) {
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39 HashMap<String, String> map = new HashMap<String, String>();
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40 map.put("type", type);
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41
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42 driver = (String)XML.xpath(
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43 document, XPATH_DRIVER, XPathConstants.STRING, null, map);
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44 user = (String)XML.xpath(
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45 document, XPATH_USER, XPathConstants.STRING, null, map);
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46 password = (String)XML.xpath(
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47 document, XPATH_PASSWORD, XPathConstants.STRING, null, map);
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48 url = (String)XML.xpath(
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49 document, XPATH_URL, XPathConstants.STRING, null, map);
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50
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51 if (log.isDebugEnabled()) {
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52 log.debug("driver: " + driver);
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53 log.debug("user: " + user);
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54 log.debug("password: *******");
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55 log.debug("url: " + url);
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56 }
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57 }
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58
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59 public Connection getConnection() throws SQLException {
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60
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61 if (driver != null && driver.length() > 0) {
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62 try {
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63 Class.forName(driver);
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64 }
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65 catch (ClassNotFoundException cnfe) {
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66 throw new SQLException(cnfe);
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67 }
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68 }
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69
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70 Connection connection =
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71 DriverManager.getConnection(url, user, password);
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72
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73 connection.setAutoCommit(false);
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74
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75 DatabaseMetaData metaData = connection.getMetaData();
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76
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77 if (metaData.supportsTransactionIsolationLevel(
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78 Connection.TRANSACTION_READ_UNCOMMITTED)) {
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79 connection.setTransactionIsolation(
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80 Connection.TRANSACTION_READ_UNCOMMITTED);
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81 }
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82
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83 return connection;
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84 }
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85
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86 public ConnectedStatements getConnectedStatements() throws SQLException {
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87 return new ConnectedStatements(
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88 getConnection(),
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89 new Statements(type, driver != null ? driver : "")
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90 .getStatements());
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91 }
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92 }
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93 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org