Question

背景

我正在ASP.net 4.0中使用Visual Studio Professional 2010和C＃以SQL Server 2005作为后端构建用户输入表单。此表单是使用Microsoft提供的向导构建的。换句话说，我没有为此编写代码，而是通过单击并填写列表视图的对话框来使用提供给我的选项。我没有以任何方式定制这个。编辑，删除，更新和插入已启用。

此表单使用下拉列表过滤记录。此表单中有两个表：列出辅助医疗人员的人员表和列出其班次偏好的“首选项”表。此表单将过滤特定的护理人员，然后添加多个班次偏好。

问题是当我运行页面并尝试使用Insert命令插入数据时，我收到一条错误消息。错误消息显示为：

无法将值NULL插入“Preference_PK”列表中   'ColdFusion_Apps.dbo.Preferences';列不允许空值。插入   失败。该语句已终止。描述：未处理   在执行当前Web请求期间发生异常。   请查看堆栈跟踪以获取有关错误的更多信息   它起源于代码。

异常详细信息：System.Data.SqlClient.SqlException：无法插入   值为NULL的表'Preference_PK'，表   'ColdFusion_Apps.dbo.Preferences';列不允许空值。插入   失败。声明已经终止。

我该如何解决这个问题？我怀疑问题是我的Preferences表的主键列，但是如果我按照所有向导并只采用默认选项，为什么会发生这种情况呢？

用于创建数据库的SQL代码

 CREATE TABLE Preferences
(
  Preference_PK INT NOT NULL IDENTITY(1,1)
, Name_FK INT NOT NULL
, Preference VARCHAR(20)
)
;

INSERT INTO Preferences (Name_FK, Preference)
VALUES
 (1,'Make a Selection')
,(2,'Make a Selection')
,(3,'Make a Selection')
,(4,'Make a Selection')
,(5,'Make a Selection')
;

ALTER TABLE Preferences
ADD CONSTRAINT PreferencePrimaryKey PRIMARY KEY CLUSTERED(Preference_PK)
;

ALTER TABLE Preferences
ADD CONSTRAINT PersonnelForeignKey FOREIGN KEY(Personnel_FK) REFERENCES Personnel(Personnel_PK)
;
CREATE TABLE Personnel
(
Personnel_PK INT NOT NULL IDENTITY(1,1)
, Name VARCHAR(50) NULL
, Title VARCHAR(20) NULL
, DateHired SMALLDATETIME NULL
)
;

INSERT INTO Personnel (Name, Title, DateHired)
VALUES
 ('Abes, Benjamin','Lieutenant','March 18, 2004')
,('Acton, Traci','Paramedic','May 30, 1991')
,('Adams, Bunny','Paramedic','January 4, 2001')
,('Alcime, Gabner','EMT','April 12, 2007')
,('Angel, Craig','Paramedic','November 5, 1992')
;

ALTER TABLE Personnel
ADD CONSTRAINT PersonnelPrimaryKey PRIMARY KEY CLUSTERED(Personnel_PK)
;

ASP.NET 4.0代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" DataSourceID="Personnel_sql"
        DataTextField="Name" DataValueField="Personnel_PK">
    </asp:DropDownList>
    <asp:SqlDataSource ID="Personnel_sql" runat="server" ConnectionString="<%$ ConnectionStrings:ColdFusion_AppsConnectionString %>"
        SelectCommand="SELECT [Name], [Personnel_PK] FROM [Personnel]"></asp:SqlDataSource>
    <asp:SqlDataSource ID="Preference_sql" runat="server" ConnectionString="<%$ ConnectionStrings:ColdFusion_AppsConnectionString %>"
        DeleteCommand="DELETE FROM [Preferences] WHERE [Preference_PK] = @Preference_PK"
        InsertCommand="INSERT INTO [Preferences] ([Personnel_FK], [Preference], [Preference_PK]) VALUES (@Personnel_FK, @Preference, @Preference_PK)"
        SelectCommand="SELECT Preference_PK, Personnel_FK, Preference FROM Preferences WHERE (Personnel_FK = @Personnel_FK)"
        UpdateCommand="UPDATE [Preferences] SET [Personnel_FK] = @Personnel_FK, [Preference] = @Preference WHERE [Preference_PK] = @Preference_PK">
        <DeleteParameters>
            <asp:Parameter Name="Preference_PK" Type="Int32" />
        </DeleteParameters>
        <InsertParameters>
            <asp:Parameter Name="Personnel_FK" Type="Int32" />
            <asp:Parameter Name="Preference" Type="String" />
            <asp:Parameter Name="Preference_PK" Type="Int32" />
        </InsertParameters>
        <SelectParameters>
            <asp:ControlParameter ControlID="DropDownList1" Name="Personnel_FK" PropertyName="SelectedValue"
                Type="Int32" />
        </SelectParameters>
        <UpdateParameters>
            <asp:Parameter Name="Personnel_FK" Type="Int32" />
            <asp:Parameter Name="Preference" Type="String" />
            <asp:Parameter Name="Preference_PK" Type="Int32" />
            <asp:Parameter Name="Preference_PK" />
        </UpdateParameters>
    </asp:SqlDataSource>
    <asp:ListView ID="ListView1" runat="server" DataKeyNames="Preference_PK" DataSourceID="Preference_sql"
        InsertItemPosition="LastItem">
        <AlternatingItemTemplate>
            <tr style="">
                <td>
                    <asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
                    <asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
                </td>
                <td>
                    <asp:Label ID="Preference_PKLabel" runat="server" Text='<%# Eval("Preference_PK") %>' />
                </td>
                <td>
                    <asp:Label ID="Personnel_FKLabel" runat="server" Text='<%# Eval("Personnel_FK") %>' />
                </td>
                <td>
                    <asp:Label ID="PreferenceLabel" runat="server" Text='<%# Eval("Preference") %>' />
                </td>
            </tr>
        </AlternatingItemTemplate>
        <EditItemTemplate>
            <tr style="">
                <td>
                    <asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="Update" />
                    <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Cancel" />
                </td>
                <td>
                    <asp:Label ID="Preference_PKLabel1" runat="server" Text='<%# Eval("Preference_PK") %>' />
                </td>
                <td>
                    <asp:TextBox ID="Personnel_FKTextBox" runat="server" Text='<%# Bind("Personnel_FK") %>' />
                </td>
                <td>
                    <asp:TextBox ID="PreferenceTextBox" runat="server" Text='<%# Bind("Preference") %>' />
                </td>
            </tr>
        </EditItemTemplate>
        <EmptyDataTemplate>
            <table runat="server" style="">
                <tr>
                    <td>
                        No data was returned.
                    </td>
                </tr>
            </table>
        </EmptyDataTemplate>
        <InsertItemTemplate>
            <tr style="">
                <td>
                    <asp:Button ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
                    <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="Clear" />
                </td>
                <td>
                    <asp:TextBox ID="Preference_PKTextBox" runat="server" Text='<%# Bind("Preference_PK") %>' />
                </td>
                <td>
                    <asp:TextBox ID="Personnel_FKTextBox" runat="server" Text='<%# Bind("Personnel_FK") %>' />
                </td>
                <td>
                    <asp:TextBox ID="PreferenceTextBox" runat="server" Text='<%# Bind("Preference") %>' />
                </td>
            </tr>
        </InsertItemTemplate>
        <ItemTemplate>
            <tr style="">
                <td>
                    <asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
                    <asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
                </td>
                <td>
                    <asp:Label ID="Preference_PKLabel" runat="server" Text='<%# Eval("Preference_PK") %>' />
                </td>
                <td>
                    <asp:Label ID="Personnel_FKLabel" runat="server" Text='<%# Eval("Personnel_FK") %>' />
                </td>
                <td>
                    <asp:Label ID="PreferenceLabel" runat="server" Text='<%# Eval("Preference") %>' />
                </td>
            </tr>
        </ItemTemplate>
        <LayoutTemplate>
            <table runat="server">
                <tr runat="server">
                    <td runat="server">
                        <table id="itemPlaceholderContainer" runat="server" border="0" style="">
                            <tr runat="server" style="">
                                <th runat="server">
                                </th>
                                <th runat="server">
                                    Preference_PK
                                </th>
                                <th runat="server">
                                    Personnel_FK
                                </th>
                                <th runat="server">
                                    Preference
                                </th>
                            </tr>
                            <tr id="itemPlaceholder" runat="server">
                            </tr>
                        </table>
                    </td>
                </tr>
                <tr runat="server">
                    <td runat="server" style="">
                    </td>
                </tr>
            </table>
        </LayoutTemplate>
        <SelectedItemTemplate>
            <tr style="">
                <td>
                    <asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="Delete" />
                    <asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="Edit" />
                </td>
                <td>
                    <asp:Label ID="Preference_PKLabel" runat="server" Text='<%# Eval("Preference_PK") %>' />
                </td>
                <td>
                    <asp:Label ID="Personnel_FKLabel" runat="server" Text='<%# Eval("Personnel_FK") %>' />
                </td>
                <td>
                    <asp:Label ID="PreferenceLabel" runat="server" Text='<%# Eval("Preference") %>' />
                </td>
            </tr>
        </SelectedItemTemplate>
    </asp:ListView>
    </form>
</body>
</html>

问题

如何使用此Listview将值插入数据库？
我做错了什么？
请明确告诉我这个。我不是程序员，所以对我来说，你不能太简单。

Answer 1

请尝试使用此insert语句。您不在insert语句中包含标识键。

InsertCommand =“INSERT INTO [Preferences]（[Preference]， [Preference_PK]）VALUES（@ Preference，@ Preference_PK）“

无法使用Listview插入数据

1 个答案: