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我有一个Java项目为学校。我使用sql和JFrame工作,当我尝试从订单中删除(或编辑)记录时,订单的所有记录都被删除而不是一个,所以我有3个表格(客户,订单,汽车)。我猜我的SQL查询有问题。 因此,如果任何人都可以告诉我我的错误,那就太好了。 :)为什么我的sql表中的所有记录都被删除?
这里是我的代码:
class DeleteOrder implements ActionListener{
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
conn = DBConnector.getConnected();
String selectCustomerId = "select cus_id from customers where lname=? and ";
String selectCarId = "select car_id from cars where model=?";
String selectedCustomer = customersCombo.getSelectedItem().toString();
String selectedCar = carsCombo.getSelectedItem().toString();
String sql="delete from Orders where " + selectCustomerId + selectCarId;
try {
state = conn.prepareStatement(sql);
state.setString(1, selectedCustomer);
state.setString(2, selectedCar);
state.execute();
getAllDataFromOrders();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}//end Delete ORder
我希望它看起来像这样:'SQL = “从订单删除其中cus_id =” + selectCustomerId +“AND car_id =”+ selectCarId;' –