我目前正在为餐馆申请。我正在处理的代码的想法是,它从组合框中获取名称,并将收据插入数据库,其中包含正在处理它的人员的员工编号。我正在努力做的代码是:
RestaurantOrder sqlRestaurantOrder = new RestaurantOrder();
ActionListener printReceiptListner;
printReceiptListner = (ActionEvent) -> {
int ID = Integer.parseInt(input1.getText());
try {
SystemManager manager = new SystemManager();
ResultSet rs = manager.stmt.executeQuery(sqlRestaurantOrder.setIdSql(ID));
while (rs.next()) {
double totalPrice = rs.getDouble("sumprice");
if (ID > 0) {
Receipt receiptSql = new Receipt();
String firstName = (String) cb.getSelectedItem();
String checkoutDate = new SimpleDateFormat("yyyyMMdd").format(Calendar.getInstance().getTime());
ResultSet rs2 = manager.stmt.executeQuery(receiptSql.getEmployeeId(firstName));
int employeeId = rs2.getInt("id");
while (rs2.next()) {
Receipt receiptSql2 = new Receipt();
ResultSet rs3 = manager.stmt.executeQuery(receiptSql2.SetStatusReceipt(employeeId, checkoutDate, ID, totalPrice));
while (rs3.next()) {
}
}
}
}
} catch (SQLException k) {
JOptionPane.showMessageDialog(null, k.getMessage());
}
};
陈述是:
public class Receipt {
public String sql;
public String sql2;
public String getEmployeeId(String firstName){
return sql2 = "SELECT id FROM employee WHERE firstName = '" + firstName + "';";
}
public String SetStatusReceipt(int employeeId, String checkoutDate, int id, double totalPrice){
return sql = "INSERT INTO `receipt` (`employeeId`, `price`, `restaurantOrderId`, `checkoutDate`) VALUES (" + employeeId + " , " + totalPrice + ", " + id + ", " + checkoutDate + ");";
};
}
我在结果集开始之前收到了错误,我查看了它的意思但是我现在无法修复它。将不胜感激。
如果我忘记发布更重要的代码,请告诉我我会更新它
答案 0 :(得分:2)
您必须先致电ResultSet.next()
,然后才能访问ResultSet
的字段。因此,您需要将employeeId
的作业移至while
循环:
while (rs2.next()) {
int employeeId = rs2.getInt("id");
来自ResultSet.next()
的文档:
ResultSet
光标最初位于第一行之前;第一次调用方法next
使第一行成为当前行;第二个调用使第二行成为当前行,依此类推。