Question

我是想要通过在文本框中输入电子邮件地址和新密码来更改任何人密码的管理员。存储过程如下：

   Alter proc spChangePassword
  @Email varchar(100),
 @Passwordd varchar(100)
  as
   begin
   IF EXISTS (SELECT * FROM tblRegister WHERE Email=@Email) 
   begin
   UPDATE tblRegister
   SET Passwordd=@Passwordd where Email=@Email
  Select 0
   end
  ELSE
   BEGIN
  Select -1
  end
   end

，代码隐藏如下：

private void ChangePassword()
{
    string CS = ConfigurationManager.ConnectionStrings["ABCD"].ConnectionString;
    using(SqlConnection con = new SqlConnection(CS))
    {
        con.Open();
        SqlCommand cmd = new SqlCommand("spChangePassword", con);
        cmd.CommandType = CommandType.StoredProcedure;

        cmd.Parameters.AddWithValue("@Email",txtEmail.Text);
        cmd.Parameters.AddWithValue("@Passwordd", txtPassword.Text);
        cmd.ExecuteNonQuery();
    }
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
    ChangePassword();
}

但我想用if和else语句检查表中是否存在电子邮件。如果电子邮件存在，则更改密码，否则抛出异常。我该怎么办？

Answer 1

在您的存储过程中添加此

    Begin
    DECLARE @id AS INT
    SELECT @id = tblRegisterId FROM tblRegisterWHERE Email =@Email 
    IF @id IS not NULL
     Begin 
       UPDATE tblRegister
       SET Passwordd=@Passwordd where Email=@Email
       Select 1
     End
    Else
        Begin 
      Select 0
     End
    End

Answer 2

您可以简单地更改过程的代码并让它返回一个值。 0表示密码已更新，-1表示没有提供的电子邮件。

ALTER proc spChangePassword
    @Email varchar(100),
    @Passwordd varchar(100)
AS
BEGIN
IF EXISTS (SELECT * FROM Users WHERE Email=@Email) THEN 
BEGIN
    UPDATE tblRegister
    SET Passwordd=@Passwordd where Email=@Email
    SELECT 0 AS Result
END
ELSE
    BEGIN
        SELECT -1 AS Result
    END
END

然后你必须阅读存储过程的结果并相应地采取行动。因此，您的服务器端代码必须更改为以下内容：

var reader = cmd.ExecuteReader();
while (reader.Read()) 
{
    if(int.Parse(reader["Result"].ToString())==0)
    {
         // success
    }
    else
    {
        // failure
    }
};

更新在if声明中，您也可以使用此声明：

Convert.ToInt32(reader["Result"])==0

我认为它会像魅力一样起作用。

Answer 3

试试这个： -

private bool ChangePassword()
{
    string CS = ConfigurationManager.ConnectionStrings["ABCD"].ConnectionString;
    using(SqlConnection con = new SqlConnection(CS))
    {
        con.Open();
        SqlCommand cmd = new SqlCommand("spChangePassword", con);
        cmd.CommandType = CommandType.StoredProcedure;

        cmd.Parameters.AddWithValue("@Email",txtEmail.Text);
        cmd.Parameters.AddWithValue("@Passwordd", txtPassword.Text);
        int count = cmd.ExecuteNonQuery();
        if (count > 0)
            return true;
        else
            return false;
    }
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
    bool success = ChangePassword(); //Use this success variable to show a message.
}

您也可以更改存储过程，但不会抛出任何异常，只会检查。如果电子邮件存在，它将执行更新查询： -

Create proc spChangePassword
  @Email varchar(100),
  @Passwordd varchar(100)
as
begin
IF EXISTS ( SELECT * FROM tblRegister WHERE Email = @Email)
BEGIN
UPDATE tblRegister
  SET Passwordd=@Passwordd where Email=@Email
END
end

Answer 4

尝试此存储过程（请使用 IF EXISTS ）

 CREATE PROCEDURE InsertName
    (
      @Email varchar(25), 
      @Passwordd varchar(25)
    )
    AS
    IF EXISTS(SELECT 'True' FROM tblRegister WHERE Email = @Email)
    BEGIN
      --This means it exists,update
      UPDATE tblRegister
          SET Passwordd=@Passwordd where Email=@Email
 SELECT 'Changed successfully'
    END
    ELSE
    BEGIN
      --This means the record isn't in there already
      SELECT 'Does Not Exist' 
    END

private string ChangePassword()
{
    string CS = ConfigurationManager.ConnectionStrings["ABCD"].ConnectionString;
    using(SqlConnection con = new SqlConnection(CS))
    {
        con.Open();
        SqlCommand cmd = new SqlCommand("spChangePassword", con);
        cmd.CommandType = CommandType.StoredProcedure;

        cmd.Parameters.AddWithValue("@Email",txtEmail.Text);
        cmd.Parameters.AddWithValue("@Passwordd", txtPassword.Text);
        return cmd.ExecuteNonQuery().ToString();
    }
}

Answer 5

SQL

Create proc spChangePassword
  @Email varchar(100),
  @Passwordd varchar(100)
as
begin
 IF EXISTS ( SELECT * FROM tblRegister WHERE Email = @Email)
  BEGIN
   UPDATE tblRegister
    SET Passwordd=@Passwordd where Email=@Email
  END
 ELSE
  BEGIN
   RAISEERROR('Email does not exists',0,1)
  END
end

C＃

string CS = ConfigurationManager.ConnectionStrings["ABCD"].ConnectionString;
using(SqlConnection con = new SqlConnection(CS))
{
    try{
    con.Open();
    SqlCommand cmd = new SqlCommand("spChangePassword", con);
    cmd.CommandType = CommandType.StoredProcedure;

    cmd.Parameters.AddWithValue("@Email",txtEmail.Text);
    cmd.Parameters.AddWithValue("@Passwordd", txtPassword.Text);
    cmd.ExecuteNonQuery();
    }
    catch(SqlException ee)
    {
      ...
    }
}

使用if和else块更改密码

5 个答案:

在您的存储过程中添加此