日期格式图片在转换整个输入字符串之前结束

public boolean delDjCase(String personid,String caseid,String disposeid,String pcasetime){
  String sql = "delete from personcase where personid=? and" +
    " caseid=? and disposeid =? and pcasetime = to_date(?,'yyyy-mm-dd hh24:mi:ss')";
  conn = db.getConn();
  try {
   ps = conn.prepareStatement(sql);
   ps.setString(1, personid);
   ps.setString(2, caseid);
   ps.setString(3, disposeid);
   ps.setString(4, pcasetime);
   ps.executeUpdate();
   rs = ps.executeQuery();
   while(rs.next()){
    flag = true;
   }
  } catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }finally{
   //关闭数据库连接
   if(conn!=null){
    try {
     rs.close();
    } catch (SQLException e1) {
     // TODO Auto-generated catch block
     e1.printStackTrace();
    }
    try {
     ps.close();
    } catch (SQLException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
    try {
     conn.close();
    } catch (SQLException e) {
     // TODO Auto-generated catch block
     e.printStackTrace();
    }
   }
  }
  return flag;
 } 

 

我的日期总是出错。为什么啊？pcasetime是从前面传来的。我这样转换：

pcasetime = to_date(?,'yyyy-mm-dd hh24:mi:ss')

不对吗？