jsp - 如何在jsp中将最后插入的id放入jdbc

Question

如何从 jsp 中刚刚插入的行中获取 ID？

        PreparedStatement ps = con.prepareStatement("INSERT INTO Recipients(CustomerID,Name, Street, City, ZipCode, PhoneNumber, EmailAddress,"
            + " ContactPersonName, ContactPersonSurname, ContactPersonPhoneNumber,ContactPersonEmailAddress) "
            + "values(?,?,?,?,?,?,?,?,?,?,?)");

我需要使用 Recipients 的 id 将其插入 Parcels

PreparedStatement ps2 = con.prepareStatement("INSERT INTO Parcels(TransportTypeID,CustomerID,RecipientID,ParcelAmount, DimLength, DimHeight, DimWidth, ParcelWeigth, Content,"
            + " AdditionalDescription, IsCustomParcel, ReceiptFee, InsuranceAmount, OwnPick, DispatchDate) "
            + "values((?,?,?,?,?,?,?,?,?,?,?,?,?,?,?");

    ps2.setString(1,transportTypeID);
    ps2.setString(2,customerID);
    ps2.setInt(3,recipientID); ...

我试图使用结果集：

int recipientID=0;
    ResultSet rs2=st.executeQuery("SELECT * FROM Recipients");
    if(rs2.last())
           {
            recipientID = rs2.getInt("RecipientID");
           }

但它没有用。

Answer 1

尝试这样的事情：

String query = "BEGIN " +
               "  INSERT INTO Recipients( CustomerID, Name, Street, City, ZipCode, PhoneNumber" + 
               "                         ,EmailAddress, ContactPersonName, ContactPersonSurname" +
               "                         ,ContactPersonPhoneNumber, ContactPersonEmailAddress) " +
               "    VALUES(?,?,?,?,?,?,?,?,?,?,?) RETURNING id into ?; " +
               "END;";

CallableStatement cs = conn.prepareCall(query);

cs.setString(1,transportTypeID);
cs.setString(2,customerID);
cs.setInt(3,recipientID);
...
cs.registerOutParameter(12, java.sql.Types.INTEGER);

cs.execute();

int id = cs.getInt(12);

然后使用生成的 id 进行下一次插入。或者你也可以把它全部放入一个过程中。

Answer 2

我找到了解决方案： ResultSet rs2=st.executeQuery("SELECT * FROM Recipients ORDER BY RecipientID DESC Limit 1;"); while(rs2.next()) { recipientID = rs2.getInt(1); }