插入查詢異常「沒有爲一個或多個必需參數給出值」

Question

這裏我向表（註冊）中添加5個數據，並且它包含6個列，其中ID是主鍵的縮進。但我得到一個異常，在「myCommand.ExecuteReader（）;」一個或多個必需的參數沒有值同時嘗試插入其他數據列。

public void SubmitClick(Object sender, EventArgs e) 
{ 
    insertdata(FN.Text,LN.Text,DOB.Text,mailid.Text,username.Text); 
} 
public void insertdata(string fname, string sname, string dob ,string email ,string uname) 
{ 

    //Connection string for the datbase 
    string database = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source= C:\Users\atchutharamkj\documents\visual studio 2010\Projects\WebApplication1\WebApplication1\App_Data\Database3.accdb;Persist Security Info=True"; 
    OleDbConnection myConn = new OleDbConnection(database); 
    string queryStr = @"Insert into Registration Values (fname , sname, dob , email, uname)"; 
    OleDbCommand myCommand = new OleDbCommand(queryStr, myConn); 
    myCommand.Connection.Open(); 
    myCommand.ExecuteReader(); 
    myCommand.Connection.Close(); 

} 

Answer 1

您的查詢是錯誤的，這種方式你沒有傳遞任何信息。

使用參數化這樣的疑問：

public void SubmitClick(Object sender, EventArgs e) 
{ 
    insertdata(FN.Text,LN.Text,DOB.Text,mailid.Text,username.Text); 
} 

public void insertdata(string fname, string sname, string dob ,string email ,string uname) 
{ 
    string database = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source= C:\Users\atchutharamkj\documents\visual studio 2010\Projects\WebApplication1\WebApplication1\App_Data\Database3.accdb;Persist Security Info=True"; 
    OleDbConnection myConn = new OleDbConnection(database); 

    string queryStr = @"Insert into Registration(FirstName,LastName,DOB,[E-Mail],Username) Values (?, ?, ?, ?, ?)"; 

    OleDbCommand myCommand = new OleDbCommand(queryStr, myConn); 
    myCommand.Parameters.AddWithValue("@fname", fname); 
    myCommand.Parameters.AddWithValue("@sname", sname); 
    myCommand.Parameters.AddWithValue("@dob", dob); 
    myCommand.Parameters.AddWithValue("@email", email); 
    myCommand.Parameters.AddWithValue("@uname", uname); 

    myCommand.Connection.Open(); 
    myCommand.ExecuteNonQuery(); 
    myCommand.Connection.Close(); 
} 

更多參數傳遞到OLEDB看到MSDN。