Question

我正在开发一个用于管理项目库存的系统，并试图获取接近其到期日期的库存项目的列表

这是表的创建方式：

Query_Statement.executeUpdate("CREATE TABLE STOCK_PURCHASE ( SP_ID INTEGER PRIMARY KEY AUTOINCREMENT,"
                    + "USER_ID INTEGER,STOCK_ID INTEGER,SUPPLIER_ID INTEGER,SP_ENTRY_DATE TEXT,"
                    + "SP_PURCHASE_PRICE REAL, SP_SELLBY_DATE TEXT, SP_QUANTITY REAL,"
                    + "FOREIGN KEY (USER_ID) REFERENCES USER (USER_ID),"
                    + "FOREIGN KEY (STOCK_ID) REFERENCES STOCK (STOCK_ID),"
                    + "FOREIGN KEY (SUPPLIER_ID) REFERENCES SUPPLIER (SUPPLIER_ID))");

这是我使用的功能：

public ArrayList<String> GetExpiredStock(){
    Connection dbConnection = null;
    ResultSet list = null;
    ArrayList<String> ls = new ArrayList<String>();

    LocalDate currentDate = LocalDate.now();
    //System.out.println(today);
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");

    try {
        dbConnection = DriverManager.getConnection("jdbc:sqlite:"+dbName+".db");

        Statement Query_Statement = dbConnection.createStatement();
        Query_Statement.setQueryTimeout(10);

        list = Query_Statement.executeQuery("SELECT SP_ENTRY_DATE, STOCK_ID FROM STOCK_PURCHASE"); //this works

        while (list.next()) {
            try {
            LocalDate expDate = LocalDate.parse(list.getString("SP_SELLBY_DATE"), formatter);
            LocalDate monthAway = expDate.minusMonths(1);
            System.out.println(currentDate);
            if(currentDate.isAfter(monthAway)) {
                int id = list.getInt("STOCK_ID");
                ResultSet ids = Query_Statement.executeQuery("SELECT STOCK_NAME FROM STOCK WHERE STOCK_ID=" + id);

                ls.add(ids.getString("STOCK_NAME") + "\t\t" + 
                        list.getString("SP_SELLBY_DATE") + getStockQuant(list.getInt("STOCK_ID"), 
                                currentDate));

            }
            }catch(SQLException e) {
                System.err.println(e);
                continue;


            }
        }

    } catch (SQLException e) {
        System.err.println(e.getMessage());
    } finally {
        try {
            if (dbConnection != null)
                dbConnection.close();
        } catch (SQLException e) {
            System.err.println(e);
        }
    }

    return ls;
}

我希望它可以得到到期日期。但是它一直在说：

java.sql.SQLException: no such column: 'SP_SELLBY_DATE'

编辑：

我将代码更改如下：

    public ArrayList<String> GetExpiredStock(){
    Connection dbConnection = null;
    ResultSet list = null;
    ArrayList<String> ls = new ArrayList<String>();

    LocalDate currentDate = LocalDate.now();
    //System.out.println(today);
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern("dd/MM/yyyy");

    try {
        dbConnection = DriverManager.getConnection("jdbc:sqlite:"+dbName+".db");

        Statement Query_Statement = dbConnection.createStatement();
        Query_Statement.setQueryTimeout(10);

        list = Query_Statement.executeQuery("SELECT SP_SELLBY_DATE, STOCK_ID FROM STOCK_PURCHASE"); //this works

        while (list.next()) {
            try {
            String da = list.getString("SP_SELLBY_DATE");
            int id = list.getInt("STOCK_ID");
            System.out.println("Executed on id = " + id);
            LocalDate expDate = LocalDate.parse(da, formatter);
            LocalDate monthAway = expDate.minusMonths(1);
            System.out.println(currentDate);
            if(currentDate.isAfter(monthAway)) {

                ResultSet ids = Query_Statement.executeQuery("SELECT STOCK_NAME FROM STOCK WHERE STOCK_ID=" + id);

                ls.add(ids.getString("STOCK_NAME") + "\t\t" + 
                        da + "\t\t"+  getStockQuant(id, 
                                currentDate));

            }
            }catch(SQLException e) {
                System.err.println(e);
                continue;


            }
        }

    } catch (SQLException e) {
        System.err.println(e.getMessage());
    } finally {
        try {
            if (dbConnection != null)
                dbConnection.close();
        } catch (SQLException e) {
            System.err.println(e);
        }
    }

    return ls;

但是在第一次迭代后仍然失败

Answer 1

您的SQL查询没有必填列，请将其添加：

SELECT SP_ENTRY_DATE, STOCK_ID, SP_SELLBY_DATE FROM STOCK_PURCHASE

Answer 2

我相信您在循环中list.getString("SP_SELLBY_DATE")对其进行了两次查询，这应该是根本原因。相反，应该在获取变量时使用变量，以避免在光标更改后再次调用该变量。

java.sql.SQLException：无此类列：接受SQL查询后

2 个答案: