java - Java连接数据库异常:JDBC

Question

我正在尝试使用 JDBC 从表中获取所有列值。

这是我在主程序中编写的代码。

 Class.forName( "com.mysql.jdbc.driver" );
 String url = "jdbc:jtds:sqlserver://test.com/abc_1_20121225;instance=abcd";
 Connection conn = DriverManager.getConnection(url,"uname","pwd");
 Statement stmt = conn.createStatement();
 ResultSet rs;

  rs = stmt.executeQuery("SELECT table_name, column_name, data_type, data_length FROM USER_TAB_COLUMNS WHERE table_name = 'MyTable'");
    while ( rs.next() ) {
         String colName = rs.getString("column_name");
                     System.out.println(colName);
      }
  conn.close();
 } catch (Exception e) {
   System.err.println("Got an exception! ");
 System.err.println(e.getMessage());

我在类路径中添加了 jtds.jar。我收到这条消息

Got an exception! 
com.mysql.jdbc.driver

谁能告诉我问题的确切原因？

编辑:

添加统计跟踪；

java.lang.ClassNotFoundException: com.mysql.jdbc.driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at schwab.TestDB.main(TestDB.java:15)

Answer 1

您加载了错误的驱动程序。

替换这个:

Class.forName("com.mysql.jdbc.driver");

与

Class.forName("net.sourceforge.jtds.jdbc.Driver");