Java ResultSet转换为我的Class类型的数组

Question

我正在改写我的问题,因为显然有些人无意中被冒犯了(我是Java新手):(

我正在连接到DB2 db - ResultSet包含表V_LVCS中的前10行.

我希望完成这个!

while (rs.next())
{ keys[i] = new V_LVCS();
   keys[i] = this_Row_Object;
}

我是在一系列V_LVCS对象之后.目前我正在将每个数据行转换为V_LVCS对象,如下所示,但我假设有更好的方法来执行此操作.

 public class V_LVCS {



    public String SERIAL;
        public String TRANSFORMERID;
        public String LVT;

        public V_LVCS() {

        }

        public V_LVCS(String Serial, String Transformerid, String lvt) {
            this.SERIAL = Serial;
            this.TRANSFORMERID = Transformerid;
            this.LVT = lvt;
        }

        public V_LVCS[] getAllV_LVC() {
            try {
                Connection conn = getAMMDBConnection();

                Statement stmt = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
                ResultSet rs;
                rs = stmt.executeQuery("SELECT * FROM V_LVC FETCH FIRST 10 ROWS ONLY");
                rs.last();
                int numRows = rs.getRow();
                V_LVCS[] keys = new V_LVCS[numRows];
                rs.beforeFirst();
                int i = 0;
                while (rs.next()) {


keys[i] = new V_LVCS();
                    keys[i].SERIAL = (rs.getString("SERIAL") == null) ? "" : rs.getString("SERIAL");
                    keys[i].LVT = (rs.getString("LVT") == null) ? "" : rs.getString("LVT");
                    keys[i].TRANSFORMERID = (rs.getString("TRANSFORMERID") == null) ? "" : rs.getString("TRANSFORMERID");
                    ++i;
                }
                conn.close();
                System.out.println("stop!");
                return keys;
            } catch (Exception e) {
                System.err.println("Got an exception! ");
                // System.err.println(e.printStackTrace());
                StringWriter sw = new StringWriter();
                e.printStackTrace(new PrintWriter(sw));
                return null;
            }
        }
    }

我真的很感激你的想法!(希望在用-ve分数受到惩罚之前花几个小时!)

Answer 1

您只需要更改循环以调用构造函数,而不是尝试分配给字段:

while ( rs.next() ) {           
    String serial = ( rs.getString("SERIAL") == null)?"":rs.getString("SERIAL") ; 
    String lvt = ( rs.getString("LVT") == null)?"":rs.getString("LVT");
    String id = ( rs.getString("TRANSFORMERID") == null)?"":rs.getString("TRANSFORMERID") ;
    keys[i] = new V_LVCS(serial, id, lvt);
    ++i;
}

特别注意,这一行:

V_LVCS [] keys = new V_LVCS[numRows];

创建一个引用数组V_LVCS,所有 引用都是null.在取消引用该元素之前,您需要为每个元素指定一些内容.