1
14
15 package com.liferay.portal.spring.hibernate;
16
17 import com.liferay.portal.dao.orm.hibernate.DB2Dialect;
18 import com.liferay.portal.kernel.dao.db.DBFactoryUtil;
19 import com.liferay.portal.kernel.dao.jdbc.DataAccess;
20 import com.liferay.portal.kernel.log.Log;
21 import com.liferay.portal.kernel.log.LogFactoryUtil;
22 import com.liferay.portal.kernel.util.GetterUtil;
23
24 import java.sql.Connection;
25 import java.sql.DatabaseMetaData;
26
27 import java.util.Properties;
28
29 import javax.sql.DataSource;
30
31 import org.hibernate.dialect.DB2400Dialect;
32 import org.hibernate.dialect.Dialect;
33 import org.hibernate.dialect.SybaseASE15Dialect;
34 import org.hibernate.dialect.resolver.DialectFactory;
35
36
41 public class DialectDetector {
42
43 public static String determineDialect(DataSource dataSource) {
44 Dialect dialect = getDialect(dataSource);
45
46 DBFactoryUtil.setDB(dialect);
47
48 if (_log.isInfoEnabled()) {
49 _log.info("Using dialect " + dialect.getClass().getName());
50 }
51
52 return dialect.getClass().getName();
53 }
54
55 public static Dialect getDialect(DataSource dataSource) {
56 Dialect dialect = null;
57
58 Connection connection = null;
59
60 try {
61 connection = dataSource.getConnection();
62
63 DatabaseMetaData databaseMetaData = connection.getMetaData();
64
65 String dbName = databaseMetaData.getDatabaseProductName();
66 int dbMajorVersion = databaseMetaData.getDatabaseMajorVersion();
67
68 if (_log.isInfoEnabled()) {
69 _log.info(
70 "Determining dialect for " + dbName + " " + dbMajorVersion);
71 }
72
73 if (dbName.startsWith("HSQL")) {
74 if (_log.isWarnEnabled()) {
75 _log.warn(
76 "Liferay is configured to use Hypersonic as its " +
77 "database. Do NOT use Hypersonic in production. " +
78 "Hypersonic is an embedded database useful " +
79 "for development and demo'ing purposes.");
80 }
81 }
82
83 if (dbName.equals("ASE") && (dbMajorVersion == 15)) {
84 dialect = new SybaseASE15Dialect();
85 }
86 else if (dbName.startsWith("DB2") && (dbMajorVersion == 9)) {
87 dialect = new DB2Dialect();
88 }
89 else {
90 dialect = DialectFactory.buildDialect(
91 new Properties(), connection);
92 }
93 }
94 catch (Exception e) {
95 String msg = GetterUtil.getString(e.getMessage());
96
97 if (msg.indexOf("explicitly set for database: DB2") != -1) {
98 dialect = new DB2400Dialect();
99
100 if (_log.isWarnEnabled()) {
101 _log.warn(
102 "DB2400Dialect was dynamically chosen as the " +
103 "Hibernate dialect for DB2. This can be " +
104 "overriden in portal.properties");
105 }
106 }
107 else {
108 _log.error(e, e);
109 }
110 }
111 finally {
112 DataAccess.cleanUp(connection);
113 }
114
115 if (dialect == null) {
116 throw new RuntimeException("No dialect found");
117 }
118
119 return dialect;
120 }
121
122 private static Log _log = LogFactoryUtil.getLog(DialectDetector.class);
123
124 }