groovy:合計出貨通知明細

groovy:合計出貨通知明細
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=((Integer)A_PO.get_Value("出貨通知_ID")).intValue();

String sql = "SELECT SUM(金額)  FROM 出貨通知明細 WHERE 出貨通知_id =? ";
PreparedStatement pstmt = DB.prepareStatement(sql, A_PO.get_TrxName());
pstmt.setInt(1, parent_id);
ResultSet rs = pstmt.executeQuery();
while (rs.next()) {
BigDecimal price = rs.getBigDecimal (1);

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

DB.executeUpdateEx("UPDATE 出貨通知 SET 銷貨金額="+price+" , 銷貨稅額="+price+" *營業稅率/100, 合計="+price+" * (1 + 營業稅率/100) WHERE 出貨通知_id ="+parent_id,  A_PO.get_TrxName());
}
rs.close();
pstmt.close();