groovy:合計採購單金額

groovy:合計採購單金額
Model Validator Table Event
====================
import groovy.sql.Sql
import java.sql.Timestamp
import java.sql.PreparedStatement
import java.sql.ResultSet
import org.compiere.util.Env
import org.compiere.util.DB
//  A_Ctx   A_PO  A_Type  A_Event

int client=Env.getContextAsInt(A_Ctx, "AD_Client_ID");
int org=Env.getContextAsInt(A_Ctx, "AD_Org_ID");
int uid=Env.getContextAsInt(A_Ctx, "#AD_User_ID");
//  int parent_id=Env.getContextAsInt(A_Ctx, "採購單_ID");
int parent_id=((Integer)A_PO.get_Value("採購單_ID")).intValue();

String sql = "SELECT SUM(採購金額),SUM(本幣金額)  FROM 採購單明細 WHERE 採購單_id =? ";
PreparedStatement pstmt = DB.prepareStatement(sql, A_PO.get_TrxName());
pstmt.setInt(1, parent_id);
ResultSet rs = pstmt.executeQuery();
while (rs.next()) {
BigDecimal purprice = rs.getBigDecimal (1);
BigDecimal price = rs.getBigDecimal (2);

if (purprice ==null)  purprice = new BigDecimal(0);
if (price ==null)  price = new BigDecimal(0);

DB.executeUpdateEx("UPDATE 採購單 SET 原幣未稅金額="+purprice+" , 本幣未稅金額="+price+", 原幣稅額="+purprice+" *營業稅率/100, 本幣稅額="+price+" *營業稅率/100, 合計="+price+"*(1+營業稅率/100)  WHERE 採購單_id ="+parent_id,  A_PO.get_TrxName());
}

rs.close();
pstmt.close();