Mercurial > dive4elements > framework
comparison artifact-database/src/main/java/org/dive4elements/artifactdatabase/db/SQL.java @ 473:d0ac790a6c89 dive4elements-move
Moved directories to org.dive4elements
author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Thu, 25 Apr 2013 10:57:18 +0200 |
parents | artifact-database/src/main/java/de/intevation/artifactdatabase/db/SQL.java@c40729bfe06d |
children | 415df0fc4fa1 |
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472:783cc1b6b615 | 473:d0ac790a6c89 |
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1 package de.intevation.artifactdatabase.db; | |
2 | |
3 import java.util.Properties; | |
4 | |
5 import java.io.IOException; | |
6 import java.io.InputStream; | |
7 | |
8 import org.apache.log4j.Logger; | |
9 | |
10 public class SQL { | |
11 | |
12 private static Logger logger = Logger.getLogger(SQL.class); | |
13 | |
14 protected Properties statements; | |
15 | |
16 public SQL() { | |
17 } | |
18 | |
19 public SQL(String driver) { | |
20 this(SQL.class, driver); | |
21 } | |
22 | |
23 public SQL(Class clazz, String driver) { | |
24 this(clazz, "/sql", driver); | |
25 } | |
26 | |
27 public SQL(Class clazz, String resourcePath, String driver) { | |
28 statements = loadStatements(clazz, resourcePath, driver); | |
29 } | |
30 | |
31 public static final String driverToProperties(String driver) { | |
32 return driver.replace('.', '-').toLowerCase() + ".properties"; | |
33 } | |
34 | |
35 /** | |
36 * Returns key/value pairs of SQL statements for the used database | |
37 * backend. | |
38 * The concrete set of SQL statements is determined by the | |
39 * used JDBC database driver which is configured in conf.xml. | |
40 * The class name of the driver is transformed by replacing | |
41 * all '.' with '_' and lower case the resulting string. | |
42 * The transformed string is used to load a properties file | |
43 * in '/sql/' which should contain the statements. | |
44 * Example:<br> | |
45 * <code>org.postgresql.Driver</code> results in loading of | |
46 * <code>/sql/org-postgresql-driver.properties</code>. | |
47 * @return The key/value pairs of SQL statements. | |
48 */ | |
49 protected Properties loadStatements( | |
50 Class clazz, | |
51 String resourcePath, | |
52 String driver | |
53 ) { | |
54 logger.debug("loadStatements"); | |
55 | |
56 Properties properties = new Properties(); | |
57 | |
58 String resDriver = driverToProperties(driver); | |
59 | |
60 InputStream in = null; | |
61 try { | |
62 String res = resourcePath + "/" + resDriver; | |
63 | |
64 in = clazz.getResourceAsStream(res); | |
65 | |
66 if (in == null) { | |
67 logger.warn("No SQL file for driver '" + driver + "' found."); | |
68 resDriver = driverToProperties(DBConnection.DEFAULT_DRIVER); | |
69 res = resourcePath + "/" + resDriver; | |
70 | |
71 in = clazz.getResourceAsStream(res); | |
72 if (in == null) { | |
73 logger.error("No SQL file for driver '" + | |
74 DBConnection.DEFAULT_DRIVER + "' found."); | |
75 } | |
76 } | |
77 else { | |
78 if (logger.isDebugEnabled()) { | |
79 logger.debug("found resource: " + res); | |
80 } | |
81 } | |
82 | |
83 if (in != null) { | |
84 properties.load(in); | |
85 } | |
86 } | |
87 catch (IOException ioe) { | |
88 logger.error(ioe); | |
89 } | |
90 | |
91 return properties; | |
92 } | |
93 | |
94 public String get(String key) { | |
95 boolean debug = logger.isDebugEnabled(); | |
96 if (debug) { | |
97 logger.debug("looking for SQL " + key); | |
98 logger.debug("statements != null: " + (statements != null)); | |
99 } | |
100 | |
101 String sql = statements.getProperty(key); | |
102 | |
103 if (sql == null) { | |
104 logger.error("cannot find SQL for key '" + key + "'"); | |
105 } | |
106 | |
107 if (debug) { | |
108 logger.debug("-> '" + sql + "'"); | |
109 } | |
110 | |
111 return sql; | |
112 } | |
113 } | |
114 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |