try{
while(rs.next()){
System.out.println(rs.getString("title"));
System.out.println(rs.getString("author"));
System.out.println(rs.getString("content"));
}
}catch(SQLException e){e.printStackTrace(); }
catch(NullPointerException e){e.printStackTrace(); }要打印出错误信息,才能查原因。
while(rs.next()){
System.out.println(rs.getString("title"));
System.out.println(rs.getString("author"));
System.out.println(rs.getString("content"));
}
}catch(SQLException e){e.printStackTrace(); }
catch(NullPointerException e){e.printStackTrace(); }要打印出错误信息,才能查原因。
while(rs.next()){
System.out.println(rs.getString("title"));
System.out.println(rs.getString("author"));
System.out.println(rs.getString("content"));
}--》while(rs.next()){
System.out.println(“next”);
System.out.println(rs.getString(1));
System.out.println(rs.getString(2));
System.out.println(rs.getString(3));
}
出现NullPointerException 在 while(rs.next())这一行
rs=dbQuery.executeQuery(sql);
}catch(SQLException e){ }
这一段呢,把exception print出来看看
try{
rs=dbQuery.executeQuery(sql);
}catch(SQLException e){ }