4

eclipseプロジェクトでderbyEmbeddedDatabaseを作成しましたが、eclipseで正常に実行されますが、プロジェクトをRunnable jarファイルにパックすると、データベースへの接続に失敗します。

私はこのビデオに似た何かをしました http://vinayakgarg.wordpress.com/2012/03/07/packaging-java-application-with-apache-derby-as-jar-executable-using-eclipse/

これが私のCommunicate.javaです

import java.io.File;
import java.security.NoSuchAlgorithmException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Communicate {

private static final String dbURL = "jdbc:derby:imagesDB;create=true";
private static final String tableName = "imageDB";
private static Connection conn = null;
private static Statement stmt = null;

public void insert(String path, String hash, long FileSize,
        String label_name) throws NoSuchAlgorithmException, Exception {
    try {
        stmt = conn.createStatement();
        stmt.execute("insert into " + tableName + " values (\'" + path
                + "\'," + FileSize + ",\'" + hash + "\'" + ",\'"
                + label_name + "\')");
        stmt.close();
    } catch (SQLException sqlExcept) {
        sqlExcept.printStackTrace();
    }
}

public void createConnection() {
    try {
        Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
        // Get a connection
        conn = DriverManager.getConnection(dbURL);
    } catch (Exception except) {
        except.printStackTrace();
    }
}

public void createTable() throws SQLException {
    Statement st = conn.createStatement();
    st.execute("CREATE TABLE "
            + tableName
            + " (fullPath VARCHAR(512), fileSize INTEGER, md5 VARCHAR(512), label_name VARCHAR(100))");
}

public void indexTable() throws SQLException {
    Statement st = conn.createStatement();
    st.execute("CREATE INDEX imageDBIndex ON imageDB (fullPath, label_name)");
}

public void deleteTable() throws SQLException {
    Statement st = conn.createStatement();
    st.execute("drop table " + tableName);
}

public String searchBySizeAndMD(String file_path, long size, String hash)
        throws SQLException {
    StringBuilder sb = new StringBuilder();
    Statement st = conn.createStatement();
    ResultSet rs = st
            .executeQuery("SELECT fullPath, label_name FROM (SELECT * FROM imageDB im WHERE im.fileSize = "
                    + size + " ) as A WHERE A.md5 = " + "\'" + hash + "\'");
    while (rs.next()) {
        sb.append("Image: (" + rs.getString("fullPath")
                + ") is at label: (" + rs.getString("label_name") + ")\n");
    }
    return sb.toString();
}

public String searchByImageName(String fileName) throws SQLException {
    StringBuilder sb = new StringBuilder();
    Statement st = conn.createStatement();
    ResultSet rs = st
            .executeQuery("SELECT fullPath, label_name FROM imageDB im WHERE im.fullPath like \'%"
                    + fileName + "%\'");
    while (rs.next()) {
        File out_path = new File(rs.getString("fullPath"));
        if (!fileName.equals(out_path.getName())) continue;
        sb.append("Image: (" + out_path.getPath()
                + ") is at label: (" + rs.getString("label_name") + ")\n");
    }

    return sb.toString();
}

public void deleteLabel(String label) throws SQLException {
    Statement st = conn.createStatement();
    st.execute("DELETE FROM " + tableName + " WHERE label_name = \'" + label + "\'");       
}
 }

この問題で何か助けはありますか？

4

1 に答える 1

3

データベースは、jarを実行するフォルダーにある必要があります。そうでない場合は、ドキュメントで指定方法を確認してくださいconnectionURL。実行可能なjarファイルにエクスポートされたプロジェクトの場合、jarまたはローカルlibフォルダーにそのまま追加されただけで抽出されない依存ライブラリを指定します。これらのライブラリは、クラスパスまたはマニフェストクラスパスに含まれている必要がありますderby.jar。derbytools.jar次のコードを使用して、

Communicateクラス。

import java.io.File;
import java.security.NoSuchAlgorithmException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class Communicate {

  private static final String dbURL = "jdbc:derby:imagesDB;create=true";
  private static final String tableName = "imageDB";
  private static Connection conn = null;
  private static Statement stmt = null;

  public void insert(String path, String hash, long FileSize,
                     String label_name) throws NoSuchAlgorithmException, Exception {
    try {
      stmt = conn.createStatement();
      stmt.execute("insert into " + tableName + " values (\'" + path
        + "\'," + FileSize + ",\'" + hash + "\'" + ",\'"
        + label_name + "\')");
      stmt.close();
      System.out.println("Inserted into table "+ tableName+ " values (\'" + path
        + "\'," + FileSize + ",\'" + hash + "\'" + ",\'"
        + label_name + "\')");
    } catch (SQLException sqlExcept) {
      sqlExcept.printStackTrace();
    }
  }

  public void loadDriver() {
    try {
      Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
      System.out.println("Loaded the appropriate driver");
    } catch (Exception except) {
      except.printStackTrace();
    }
  }

  public void createConnection() {
    try {
      // Get a connection
      conn = DriverManager.getConnection(dbURL);
      System.out.println("Connected to and created database ");
    } catch (Exception except) {
      except.printStackTrace();
    }
  }

  public void createTable() throws SQLException {
    Statement st = conn.createStatement();
    st.execute("CREATE TABLE "
      + tableName
      + " (fullPath VARCHAR(512), fileSize INTEGER, md5 VARCHAR(512), label_name VARCHAR(100))");
    System.out.println("Created table "+ tableName);
  }

  public void indexTable() throws SQLException {
    Statement st = conn.createStatement();
    st.execute("CREATE INDEX imageDBIndex ON imageDB (fullPath, label_name)");
    System.out.println("Created index "+ "imageDBIndex");
  }

  public void deleteTable() throws SQLException {
    Statement st = conn.createStatement();
    st.execute("drop table " + tableName);
    System.out.println("Deleted table "+ tableName);
  }

  public String searchBySizeAndMD(String file_path, long size, String hash)
    throws SQLException {
    StringBuilder sb = new StringBuilder();
    Statement st = conn.createStatement();
    ResultSet rs = st
      .executeQuery("SELECT fullPath, label_name FROM (SELECT * FROM imageDB im WHERE im.fileSize = "
        + size + " ) as A WHERE A.md5 = " + "\'" + hash + "\'");
    while (rs.next()) {
      sb.append("Image: (" + rs.getString("fullPath")
        + ") is at label: (" + rs.getString("label_name") + ")\n");
    }
    return sb.toString();
  }

  public String searchByImageName(String fileName) throws SQLException {
    StringBuilder sb = new StringBuilder();
    Statement st = conn.createStatement();
    ResultSet rs = st
      .executeQuery("SELECT fullPath, label_name FROM imageDB im WHERE im.fullPath like \'%"
        + fileName + "%\'");
    while (rs.next()) {
      File out_path = new File(rs.getString("fullPath"));
      if (!fileName.equals(out_path.getName())) continue;
      sb.append("Image: (" + out_path.getPath()
        + ") is at label: (" + rs.getString("label_name") + ")\n");
    }

    return sb.toString();
  }

  public void deleteLabel(String label) throws SQLException {
    Statement st = conn.createStatement();
    st.execute("DELETE FROM " + tableName + " WHERE label_name = \'" + label + "\'");
  }

  public static void main(String[] args)
  {
    Communicate c = new Communicate();
    c.loadDriver();
    try {
      c.createConnection();
      c.createTable();
      c.indexTable();
      c.insert("/some/path", "12323423", 45656567, "label name");
      String s = c.searchBySizeAndMD("/some/path", 45656567, "12323423");
      System.out.println("Search result: "+ s);
      c.deleteTable();
      conn.commit();
      System.out.println("Committed the transaction");

      //Shutdown embedded database
      try
      {
        // the shutdown=true attribute shuts down Derby
        DriverManager.getConnection("jdbc:derby:;shutdown=true");

      }
      catch (SQLException se)
      {
        if (( (se.getErrorCode() == 50000)
          && ("XJ015".equals(se.getSQLState()) ))) {
          // we got the expected exception
          System.out.println("Derby shut down normally");
        } else {
          System.err.println("Derby did not shut down normally");
          System.err.println("  Message:    " + se.getMessage());
        }
      }

    } catch (Exception e) {
      System.err.println("  Message:    " + e.getMessage());
    } finally {
      // release all open resources to avoid unnecessary memory usage

      //Connection
      try {
        if (conn != null) {
          conn.close();
          conn = null;
        }
      } catch (SQLException e) {
        System.err.println("  Message:    " + e.getMessage());
      }
    }
    System.out.println("Communicate finished");
  }


}

これは出力です：

Loaded the appropriate driver
Connected to and created database 
Created table imageDB
Created index imageDBIndex
Inserted into table imageDB values ('/some/path',45656567,'12323423','label name')
Search result: Image: (/some/path) is at label: (label name)

Deleted table imageDB
Committed the transaction
Derby shut down normally
Communicate finished
于 2012-08-08T14:58:47.083 に答える