字段列表中夹克中的未知列

Question

我一直在尝试向名为 bill_items 的表添加值，这是“添加到购物车”按钮的编码，但它显示错误“字段列表中的未知列 Jacket。此编码有什么问题？”

try {
    rs = stmt.executeQuery("select * from mens_wear where Item_code = 1090;");
    while(rs.next()){
        icode = rs.getInt("Item_code");
        p = rs.getInt("Price");
        bname = rs.getString("Brand_Name");
        iname = rs.getString("Item_Name");
        t = rs.getString("Type");
    }
    rs.close();
    stmt.close();
    con.close();
} catch(Exception e)
    {JOptionPane.showMessageDialog(null,e.getMessage());}
    try {
        Class.forName("java.sql.Driver");
        con = DriverManager.getConnection("jdbc:mysql://localhost/aashita","root","1510");
        stmt = con.createStatement();
        int a = stmt.executeUpdate("insert into bill_items values('"+icode+"','"+t+"','"+bname+"','"+iname+"','"+p+"');");
        JOptionPane.showMessageDialog(null,"Added Successfully");
    } catch(Exception e) {
        JOptionPane.showMessageDialog(null,e.getMessage());
    }
}

Answer 1

在插入中不指定列名称并依赖于表列顺序是一种不好的做法。如果您的任何值包含引号，则也可能存在转义查询字符串的问题。我会尝试添加列名称并使用带参数的准备好的语句。

string updateText = "insert into bill_items (Item_code, Type, Brand_Name, Item_Name, Price) ";
updateText += "values (?, ?, ?, ?, ?)";

PreparedStatement stmt = con.prepareStatement(updateText);
stmt.setInt(1, icode);
stmt.setString(2, t);
stmt.setString(3, bname);
stmt.setString(4, iname);
stmt.setInt(5, p);

int a = stmt.executeUpdate();

Answer 2

我想开一家像这样的商店

heatedjackets store任何人请告诉我如何开这种类型的商店