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annotate artifact-database/src/main/java/de/intevation/artifactdatabase/db/SQL.java @ 355:6bd37edd9a80

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Added handy implementation of a DataProvider. artifacts/trunk@3333 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Felix Wolfsteller <felix.wolfsteller@intevation.de>
date Wed, 30 Nov 2011 08:28:04 +0000
parents d96bcb40dbf9
children c40729bfe06d
rev   line source
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f33401ea2a6c Artifact database: Refactorized the usage of dialect independent SQL to be reusable.
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1 package de.intevation.artifactdatabase.db;
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2
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3 import java.util.Properties;
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4
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5 import java.io.IOException;
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6 import java.io.InputStream;
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7
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8 import org.apache.log4j.Logger;
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9
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10 public class SQL {
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11
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12 private static Logger logger = Logger.getLogger(SQL.class);
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13
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14 protected Properties statements;
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15
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16 public SQL() {
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17 }
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18
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19 public SQL(String driver) {
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20 this(SQL.class, driver);
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21 }
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22
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23 public SQL(Class clazz, String driver) {
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24 this(clazz, "/sql", driver);
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25 }
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26
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27 public SQL(Class clazz, String resourcePath, String driver) {
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28 statements = loadStatements(clazz, resourcePath, driver);
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29 }
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30
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31 public static final String driverToProperties(String driver) {
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32 return driver.replace('.', '-').toLowerCase() + ".properties";
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33 }
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34
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35 /**
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36 * Returns key/value pairs of SQL statements for the used database
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37 * backend.
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38 * The concrete set of SQL statements is determined by the
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39 * used JDBC database driver which is configured in conf.xml.
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40 * The class name of the driver is transformed by replacing
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41 * all '.' with '_' and lower case the resulting string.
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42 * The transformed string is used to load a properties file
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43 * in '/sql/' which should contain the statements.
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44 * Example:<br>
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45 * <code>org.postgresql.Driver</code> results in loading of
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46 * <code>/sql/org-postgresql-driver.properties</code>.
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47 * @return The key/value pairs of SQL statements.
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48 */
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49 protected Properties loadStatements(
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50 Class clazz,
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51 String resourcePath,
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52 String driver
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53 ) {
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54 logger.debug("loadStatements");
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55
305
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56 Properties properties = new Properties();
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57
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58 String resDriver = driverToProperties(driver);
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59
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60 InputStream in = null;
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61 try {
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62 String res = resourcePath + "/" + resDriver;
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63
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64 in = clazz.getResourceAsStream(res);
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65
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66 if (in == null) {
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67 logger.warn("No SQL file for driver '" + driver + "' found.");
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68 resDriver = driverToProperties(DBConnection.DEFAULT_DRIVER);
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69 res = resourcePath + "/" + resDriver;
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70
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71 in = clazz.getResourceAsStream(res);
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72 if (in == null) {
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73 logger.error("No SQL file for driver '" +
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74 DBConnection.DEFAULT_DRIVER + "' found.");
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75 }
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76 }
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77 else {
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78 if (logger.isDebugEnabled()) {
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79 logger.debug("found resource: " + res);
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80 }
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81 }
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82
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83 if (in != null) {
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84 properties.load(in);
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85 }
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86 }
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87 catch (IOException ioe) {
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88 logger.error(ioe);
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89 }
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90
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91 return properties;
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92 }
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93
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94 public String get(String key) {
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95 boolean debug = logger.isDebugEnabled();
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96 if (debug) {
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97 logger.debug("looking for SQL " + key);
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98 logger.debug("statements != null: " + (statements != null));
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99 }
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100
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101 String sql = statements.getProperty(key);
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102
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103 if (sql == null) {
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104 logger.error("cannot find SQL for key '" + key + "'");
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105 }
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106
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107 if (debug) {
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108 logger.debug("-> '" + sql + "'");
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109 }
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110
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111 return sql;
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112 }
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113 }
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114 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org