petshop4.0 详解之七(PetShop表示层设计)

OracleMembershipProvider类中对CreateUser()方法的定义如下：

public override MembershipUser CreateUser(string username, string password, string email, string passwordQuestion, string passwordAnswer, bool isApproved, object userId, out MembershipCreateStatus status) {
    //前面的代码略;
 //Create connection
 OracleConnection connection = new OracleConnection(OracleHelper.ConnectionStringMembership);
 connection.Open();
 OracleTransaction transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted);
 try {
  DateTime dt = DateTime.Now;
  bool isUserNew = true;

  // Step 1: Check if the user exists in the Users table: create if not   
  int uid = GetUserID(transaction, applicationId, username, true, false, dt, out isUserNew);
  if(uid == 0) { // User not created successfully!
   status = MembershipCreateStatus.ProviderError;
   return null;
  }
  // Step 2: Check if the user exists in the Membership table: Error if yes.
  if(IsUse

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