1 8 9 package je; 10 11 import java.io.File ; 12 import java.io.IOException ; 13 14 import com.sleepycat.je.Database; 15 import com.sleepycat.je.DatabaseConfig; 16 import com.sleepycat.je.DatabaseEntry; 17 import com.sleepycat.je.DatabaseException; 18 import com.sleepycat.je.Environment; 19 import com.sleepycat.je.EnvironmentConfig; 20 import com.sleepycat.je.Sequence; 21 import com.sleepycat.je.SequenceConfig; 22 23 public class SequenceExample { 24 private static final int EXIT_SUCCESS = 0; 25 private static final int EXIT_FAILURE = 1; 26 private static final String DB_NAME = "sequence.db"; 27 private static final String KEY_NAME = "my_sequence"; 28 29 public SequenceExample() { 30 } 31 32 public static void usage() { 33 System.out.println("usage: java " + 34 "je.SequenceExample " + 35 "<dbEnvHomeDirectory>"); 36 System.exit(EXIT_FAILURE); 37 } 38 39 public static void main(String [] argv) { 40 41 if (argv.length != 1) { 42 usage(); 43 return; 44 } 45 File envHomeDirectory = new File (argv[0]); 46 47 try { 48 SequenceExample app = new SequenceExample(); 49 app.run(envHomeDirectory); 50 } catch (Exception e) { 51 e.printStackTrace(); 52 System.exit(EXIT_FAILURE); 53 } 54 System.exit(EXIT_SUCCESS); 55 } 56 57 public void run(File envHomeDirectory) 58 throws DatabaseException, IOException { 59 60 61 EnvironmentConfig envConfig = new EnvironmentConfig(); 62 envConfig.setAllowCreate(true); 63 Environment env = new Environment(envHomeDirectory, envConfig); 64 65 66 DatabaseConfig dbConfig = new DatabaseConfig(); 67 dbConfig.setAllowCreate(true); 68 Database db = env.openDatabase(null, DB_NAME, dbConfig); 69 70 71 SequenceConfig config = new SequenceConfig(); 72 config.setAllowCreate(true); 73 DatabaseEntry key = 74 new DatabaseEntry(KEY_NAME.getBytes("UTF-8")); 75 Sequence seq = db.openSequence(null, key, config); 76 77 78 for (int i = 0; i < 10; i++) { 79 long seqnum = seq.get(null, 1); 80 System.out.println("Got sequence number: " + seqnum); 81 } 82 83 84 seq.close(); 85 db.close(); 86 env.close(); 87 } 88 } 89 | Popular Tags |