1..n
have
Payment
paymentID(primary key) playerID gameID rmbAmout coinAmout paymentTime orderState
0..n
play
pay
Player
playerID(primary key) playerName passwd email phoneNumber qCoin paymentUpdatedTime orderUpdatedTime
selected
Game
gameNo(primary key) gameName
1..1
Order
orderID(primary key) playerID itemID itemAmount orderTime
Item
itemID(primary key) itemName gameID itemPrice limitPurchaseAmout
