Mercurial > dive4elements > framework
comparison artifact-database/src/main/java/de/intevation/artifactdatabase/db/SQL.java @ 305:f33401ea2a6c
Artifact database: Refactorized the usage of dialect independent SQL to be reusable.
artifacts/trunk@2412 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Thu, 28 Jul 2011 10:19:35 +0000 |
| parents | |
| children | d96bcb40dbf9 |
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| 304:40b64b4aafce | 305:f33401ea2a6c |
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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 } | |
| 29 | |
| 30 public static final String driverToProperties(String driver) { | |
| 31 return driver.replace('.', '-').toLowerCase() + ".properties"; | |
| 32 } | |
| 33 | |
| 34 /** | |
| 35 * Returns key/value pairs of SQL statements for the used database | |
| 36 * backend. | |
| 37 * The concrete set of SQL statements is determined by the | |
| 38 * used JDBC database driver which is configured in conf.xml. | |
| 39 * The class name of the driver is transformed by replacing | |
| 40 * all '.' with '_' and lower case the resulting string. | |
| 41 * The transformed string is used to load a properties file | |
| 42 * in '/sql/' which should contain the statements. | |
| 43 * Example:<br> | |
| 44 * <code>org.postgresql.Driver</code> results in loading of | |
| 45 * <code>/sql/org-postgresql-driver.properties</code>. | |
| 46 * @return The key/value pairs of SQL statements. | |
| 47 */ | |
| 48 protected Properties loadStatements( | |
| 49 Class clazz, | |
| 50 String resourcePath, | |
| 51 String driver | |
| 52 ) { | |
| 53 Properties properties = new Properties(); | |
| 54 | |
| 55 String resDriver = driverToProperties(driver); | |
| 56 | |
| 57 InputStream in = null; | |
| 58 try { | |
| 59 String res = resourcePath + "/" + resDriver; | |
| 60 | |
| 61 in = clazz.getResourceAsStream(res); | |
| 62 | |
| 63 if (in == null) { | |
| 64 logger.warn("No SQL file for driver '" + driver + "' found."); | |
| 65 resDriver = driverToProperties(DBConnection.DEFAULT_DRIVER); | |
| 66 res = resourcePath + "/" + resDriver; | |
| 67 | |
| 68 in = clazz.getResourceAsStream(res); | |
| 69 if (in == null) { | |
| 70 logger.error("No SQL file for driver '" + | |
| 71 DBConnection.DEFAULT_DRIVER + "' found."); | |
| 72 } | |
| 73 } | |
| 74 | |
| 75 if (in != null) { | |
| 76 properties.load(in); | |
| 77 } | |
| 78 } | |
| 79 catch (IOException ioe) { | |
| 80 logger.error(ioe); | |
| 81 } | |
| 82 | |
| 83 return properties; | |
| 84 } | |
| 85 | |
| 86 public String get(String key) { | |
| 87 return statements.getProperty(key); | |
| 88 } | |
| 89 } | |
| 90 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |