DB2出错因为配置1

String   sqlStr="   select   a.*   ,b.*,d.*   "  
                            +   "from   table1   a   left   outer   join   table2   b   on   a.id=b.id   "  
                            +"   left   outer   join   table3   d   on   a.id=d.id   "  
                            +"   where   。。。";  
   
  Class.forName("com.ibm.db2.jcc.DB2Driver");  
  Connection   conn   =   DriverManager.getConnection("url",   "user",   "pass");  
  Statement   stmt   =   conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,   ResultSet.CONCUR_READ_ONLY);  
  ResultSet   rs   =   stmt.executeQuery(sqlStr);  
   
   
  table1是一大表，里面有170个字段，原来查询一些正常，后把table1中的一些字段长度从varchar(50)改为varchar(500)后查询出现以下错误：  
  com.ibm.db2.jcc.b.SqlException:   DB2   SQL   error:   SQLCODE:   -1585,   SQLSTATE:   54048,   SQLERRMC:   null  
   
  需改为  
  Statement   stmt   =   conn.createStatement(ResultSet.TYPE_FORWARD_ONLY,   ResultSet.CONCUR_READ_ONLY);  
  才能查询成功