HibernateUtil类（可用于连接多个数据库）

我就是我 2024-02-17 20:10 18阅读 0赞

Code: 我常用的HibernateUtil类，嘿嘿

1.  public final class HibernateUtil\{
2.  private static SessionFactory sessionFactory;
3.  
4.  
5.  private HibernateUtil()\{
6.  \}
7.  
8.  
9.  //初始化
10. static\{
11. Configuration cfg = new Configuration();
12. cfg.configure();
13. sessionFactory = cfg.buildSessionFactory();
14. \}
15. 
16. public static SessionFactory getSessionFactory()\{
17. return sessionFactory;
18. \}
19. 
20. public static Session getSession()\{
21. return sessionFactory.openSession();
22. \}
23. \}

上面是单数据库的HibernateUtil，Hibernate.cfg.xml文件默认在classpath下（src文件夹下）。

我自己写了个可以解析多个Hibernate.cfg.xml文件，访问多个数据库的HibernateUtil类（这就意味着你的项目可以使用多个数据库啊，不过对于多个数据库的事务管理我还不清楚，还是有点问题）：

Code:

1.  import org.hibernate.Query;
2.  import org.hibernate.Session;
3.  import org.hibernate.SessionFactory;
4.  import org.hibernate.cfg.Configuration;
5.  
6.  public final class HbnUtil \{// 根据hibernate.cfg.xml创建一个静态sessionFactory
7.  
8.  private static SessionFactory sf;
9.  private static SessionFactory MSsf;
10. static \{
11. try \{
12. sf = new Configuration().configure("/hbn-sqlserver.cfg.xml")
13. .buildSessionFactory();
14. MSsf = new Configuration().configure("/hbn-mysql.cfg.xml")
15. .buildSessionFactory();
16. \} catch (Exception e) \{
17. System.err.println("%%%% Error Creating SessionFactory %%%%");
18. e.printStackTrace();
19. \}
20. \}
21. 
22. public static SessionFactory getSessionFactory() \{
23. return sf;
24. \}
25. 
26. public static Session getSession() \{
27. Session s = null;
28. if (!sf.isClosed())
29. s = sf.openSession();
30. return s;
31. \}
32. 
33. public static Session getSessionByDB(String DBName) \{// 根据DBName判断
34. Session s = null;
35. 
36. if ("mysql".equals(DBName.toLowerCase())) \{
37. if (!MSsf.isClosed())
38. s = MSsf.openSession();
39. \} else if ("sqlserver".equals(DBName.toLowerCase())) \{
40. if (!sf.isClosed())
41. s = sf.openSession();
42. \} else \{
43. System.out.println("错误的 DBName！");
44. \}
45. 
46. return s;
47. \}
48. 
49. public static void closeSessionFactory() \{
50. if (!sf.isClosed()) \{
51. sf.close();
52. \}
53. \}
54. 
55. public static void closeSessionFactoryByDB(String DBName) \{
56. 
57. if ("mysql".equals(DBName.toLowerCase())) \{
58. if (!MSsf.isClosed()) \{
59. MSsf.close();
60. \}
61. \} else if ("sqlserver".equals(DBName.toLowerCase())) \{
62. if (!sf.isClosed()) \{
63. sf.close();
64. \}
65. \} else \{
66. System.out.println("错误的 DBName！");
67. \}
68. \}
69. 
70. 
71. \}