从GUI层向数据库插入数据时出现问题

时间:2010-02-28 03:57:24

标签: c# database

我在从GUI部分向数据库表插入新记录时遇到问题。我创建了具有id,name,age等的数据库表Patient .... id是identity primary key。我的问题是当我在表中插入重复的名称控件应该转到else部分,并显示消息,如...这个名称已经退出,请尝试使用其他名称... 但在我的编码没有得到.....这里是所有的代码...请有人指出我什么是错的或者这是怎么回事? GUILayer:

protected void BtnSubmit_Click(object sender, EventArgs e)
{
        if (!Page.IsValid)
        return;
        int intResult = 0;
        string name = TxtName.Text.Trim();
        int age = Convert.ToInt32(TxtAge.Text);
        string gender;
        if (RadioButtonMale.Checked)
        {
            gender = RadioButtonMale.Text;
        }
        else
        {
            gender = RadioButtonFemale.Text;
        }
        string city = DropDownListCity.SelectedItem.Value;

        string typeofdisease = "";
        foreach (ListItem li in CheckBoxListDisease.Items)
        {
            if (li.Selected)
            {
                typeofdisease += li.Value;
            }
        }
        typeofdisease = typeofdisease.TrimEnd();
        PatientBAL PB = new PatientBAL();
        PatientProperty obj = new PatientProperty();
        obj.Name = name;
        obj.Age = age;
        obj.Gender = gender;
        obj.City = city;
        obj.TypeOFDisease = typeofdisease;  
        try
        {
            intResult = PB.ADDPatient(obj);
            if (intResult > 0)
            {
                lblMessage.Text = "New record inserted successfully.";
                TxtName.Text = string.Empty;
                TxtAge.Text = string.Empty;
                RadioButtonMale.Enabled = false;
                RadioButtonFemale.Enabled = false;
                DropDownListCity.SelectedIndex = 0;
                CheckBoxListDisease.SelectedIndex = 0;                     
            }
            else
            {
                lblMessage.Text = "Name [<b>" + TxtName.Text + "</b>] alredy exists, try another name";


            }                
        }
        catch (Exception ex)
        {
            lblMessage.Text = ex.Message.ToString();
        }
        finally
        {
            obj = null;
            PB = null;
        }        

}

BAL层:

public class PatientBAL
{
public int ADDPatient(PatientProperty obj)
{
    PatientDAL pdl = new PatientDAL();
    try
    {
        return pdl.InsertData(obj);
    }
    catch
    {
        throw;
    }
    finally
    {
        pdl=null;
    }
}

}

DAL层:

public class PatientDAL
{
public string ConString = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;    
public int InsertData(PatientProperty obj)
{
    SqlConnection con = new SqlConnection(ConString);
    con.Open();
    SqlCommand com = new SqlCommand("LoadData",con);
    com.CommandType = CommandType.StoredProcedure;

    try
    {
        com.Parameters.AddWithValue("@Name", obj.Name);
        com.Parameters.AddWithValue("@Age",obj.Age);
        com.Parameters.AddWithValue("@Gender",obj.Gender);
        com.Parameters.AddWithValue("@City", obj.City);
        com.Parameters.AddWithValue("@TypeOfDisease", obj.TypeOFDisease);
        return com.ExecuteNonQuery();
    }
    catch
    {
        throw;
    }
    finally
    {
        com.Dispose();
        con.Close();
    }          
}

}

物业类别:

public class PatientProperty
{
private string name;
private int age;
private string gender;
private string city;
private string typedisease;

public string Name
{
    get
    {
        return name;
    }
    set
    {
        name = value;
    }
}
public int Age
{
    get
    {
        return age;
    }
    set
    {
        age = value;
    }
}
public string Gender
{
    get
    {
        return gender;
    }
    set
    {
        gender = value;
    }
}
public string City
{
    get
    {
        return city;
    }
    set
    {
        city = value;
    }
}
public string TypeOFDisease
{
    get
    {
        return typedisease;
    }
    set
    {
        typedisease = value;
    }
}

}

这是我的存储过程: CREATE PROCEDURE LoadData ( @Name varchar(50), @Age int, @Gender char(10), @City char(10), @TypeofDisease varchar(50) ) 如 插入患者(姓名,年龄,性别,城市,TypeOfDisease)值(@ Name,@ Age,@ Gender,@ City,@ TypeofDisease) GO

3 个答案:

答案 0 :(得分:0)

你确定你的LoadData存储过程正在进行插入而不是更新吗?

答案 1 :(得分:0)

看起来像是在抛出错误,所以它会跳到你的catch块。

您需要处理从PB.ADDPatient返回的错误,而不是值

答案 2 :(得分:0)

记录是否在数据库中重复?我恐怕你没有为数据库中的Names添加唯一约束!

如果是这种情况,并且您使用的是SQL Server,请检查以下内容: SQL Server 2005 How Create a Unique Constraint?