Question

Hi下面是我为使用JDBC连接连接到Oracle DB而编写的代码并返回一些值。但是如果我在我的机器中打开oracle toad，这段代码会建立连接并返回结果。

但是当oracle toad关闭并尝试运行此代码时，它将无法连接。

请让我知道如何连接oracle DB并手动打开oracle toad。

package library;
import java.io.IOException;
import java.sql.*;

public class DBAutomationConnection {
public static void main(String args[]) throws ClassNotFoundException, IOException, SQLException {
  DBAutomationConnection dbconn = new DBAutomationConnection();
  //Connection conn = dbconn.DBConnection1();
  dbconn.DBConnection1("select * from employee where empid='test123'","ROLE_NAME");

}

public void DBConnection1(String query, String colName)throws IOException, ClassNotFoundException{
 Connection connection = null;
 Statement stmt = null;
  try {
      // Load the JDBC driver

      String driverName = "oracle.jdbc.driver.OracleDriver";

      Class.forName(driverName);

      connection = DriverManager.getConnection("jdbc:oracle:thin:@//testhostname:1528/ServiceName", "XXAAA_U", "Jw9S");
      System.out.println("Connection successful: " +connection);


      try {
              stmt = connection.createStatement();
              ResultSet rs = stmt.executeQuery(query);
              while (rs.next()) {
                    //String UserID = rs.getString("USER_ID");
                  String UserID = rs.getString(colName);
                    System.out.println(UserID);     
              }
        } catch (SQLException e ) {
              System.out.println("Could not execute query.");
              //JDBCTutorialUtilities.printSQLException(e);
        } finally {
              if (stmt != null) { stmt.close(); }
        }


  } catch (SQLException e) {
                  System.out.println("Could not connect to the database");
  }

}

Answer 1

您应该从操作系统设置＆gt;服务初始化Oracle TNS-Listener Service。您可能需要检查您的tns配置。

Answer 2

您需要在系统中安装ORACLE客户端以远程连接oracle。

http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html

Answer 3

您的系统中是否安装了Oracle Thin驱动程序？这个link可以指导您。

如何使用JDBC连接连接Oracle DB而不在我的机器中打开Oracle

3 个答案: