MyDbEnv


1   package persist.gettingStarted;
2   
3   import java.io.File  ;
4   
5   import com.sleepycat.je.DatabaseException;
6   import com.sleepycat.je.Environment;
7   import com.sleepycat.je.EnvironmentConfig;
8   
9   import com.sleepycat.persist.EntityStore;
10  import com.sleepycat.persist.StoreConfig;
11  
12  public class MyDbEnv {
13  
14      private Environment myEnv;
15      private EntityStore store;
16  
17      // Our constructor does nothing
18      public MyDbEnv() {}
19  
20      // The setup() method opens the environment and store
21      // for us.
22      public void setup(File   envHome, boolean readOnly) 
23          throws DatabaseException {
24  
25          EnvironmentConfig myEnvConfig = new EnvironmentConfig();
26          StoreConfig storeConfig = new StoreConfig();
27  
28          myEnvConfig.setReadOnly(readOnly);
29          storeConfig.setReadOnly(readOnly);
30  
31          // If the environment is opened for write, then we want to be 
32          // able to create the environment and entity store if 
33          // they do not exist.
34          myEnvConfig.setAllowCreate(!readOnly);
35          storeConfig.setAllowCreate(!readOnly);
36  
37          // Allow transactions if we are writing to the store.
38          myEnvConfig.setTransactional(!readOnly);
39          storeConfig.setTransactional(!readOnly);
40  
41          // Open the environment and entity store
42          myEnv = new Environment(envHome, myEnvConfig);
43          store = new EntityStore(myEnv, "EntityStore", storeConfig);
44  
45      }
46  
47      // Return a handle to the entity store
48      public EntityStore getEntityStore() {
49          return store;
50      }
51  
52      // Return a handle to the environment
53      public Environment getEnv() {
54          return myEnv;
55      }
56  
57  
58      // Close the store and environment
59      public void close() {
60          if (store != null) {
61              try {
62                  store.close();
63              } catch(DatabaseException dbe) {
64                  System.err.println("Error closing store: " + 
65                                      dbe.toString());
66                 System.exit(-1);
67              }
68          }
69  
70          if (myEnv != null) {
71              try {
72                  // Finally, close the store and environment.
73                  myEnv.close();
74              } catch(DatabaseException dbe) {
75                  System.err.println("Error closing MyDbEnv: " + 
76                                      dbe.toString());
77                 System.exit(-1);
78              }
79          }
80      }
81  }
82  
83
A to Z: JavaDoc & Examples Daily Java News & Articles Open Source Projects Open Source Codes Free Computer Books Remove Frame
Free Books Free Magazines
Popular Tags