日期:2014-05-20 浏览次数:21145 次
//对数据库的增加、修改和删除的操作
  public boolean executeUpdate(String sql) {
    if (con == null) {
      creatConnection();
    }
    try {
      Statement stmt = con.createStatement();
      int iCount = stmt.executeUpdate(sql);
      System.out.println("操作成功,所影响的记录数为" + String.valueOf(iCount));
    }
    catch (SQLException e) {
      System.out.println(e.getMessage());
      System.out.println("executeUpdaterError!");
    }
    return true;
  }
//对数据库的查询操作
  public ResultSet executeQuery(String sql) {
    ResultSet rs;
    try {
      if (con == null) {
        creatConnection();
      }
      Statement stmt = con.createStatement();
      try {
        rs = stmt.executeQuery(sql);
      }
      catch (SQLException e) {
        System.out.println(e.getMessage());
        return null;
      }
    }
    catch (SQLException e) {
      System.out.println(e.getMessage());
      System.out.println("executeQueryError!");
      return null;
    }
    return rs;
  }
//关闭数据库的操作
  public void closeConnection() {
    if (con != null) {
      try {
        con.close();
      }
      catch (SQLException e) {
        e.printStackTrace(); //To change body of catch statement use File | Settings | File Templates.
        System.out.println("Failed to close connection!");
      }
      finally {
        con = null;
      }
    }
  }
------解决方案--------------------
public class stuDao
{
   private static Connection con = DBhpler.getCon();
  
   public void getResultSet()
   {
      
       PreparedStatement ps = null;
      
       ResultSet rs = null;
      
       try
       {
           con.setAutoCommit(false);
           ps = con.prepareStatement("select * from test where id=?");
           ps.setInt(1, 12);
           rs = ps.executeQuery();
       }
       catch (SQLException e)