我已经Items
在C#数据库中创建了表,因为主键的属性是AutoIncrement = True,AutoIncrementStep = 1,Unique = True,AutoIncrementSeeds = 0;
CREATE TABLE [dbo].[Items]
(
[item_id] INT NOT NULL,
[item_name] VARCHAR (50) NULL,
[item_model] VARCHAR (50) NULL,
[item_price] VARCHAR (50) NULL,
[item_quantity] VARCHAR (50) NULL,
[entry_date] VARCHAR (50) NULL,
[user_id] VARCHAR (50) NULL,
PRIMARY KEY CLUSTERED ([item_id] ASC)
);
我正在Items
使用此代码将数据插入表中:
string query = @"Insert into Items(item_name, item_model, item_price, item_quantity, entry_date, user_id)" +
"VALUES(@name, @model, @price, @quantity, @date, @user)";
using (SqlConnection c = new SqlConnection(Properties.Settings.Default.Database1ConnectionString))
{
try
{
c.Open();
if (c.State == ConnectionState.Open)
{
SqlCommand command1 = new SqlCommand(query, c);
command1.Parameters.AddWithValue("@name", name.Text.ToString());
command1.Parameters.AddWithValue("@model", model.Text.ToString());
command1.Parameters.AddWithValue("@price", price.Text.ToString());
command1.Parameters.AddWithValue("@quantity", quantity.Text.ToString());
command1.Parameters.AddWithValue("@date", dateTimePicker1.Text.ToString());
command1.Parameters.AddWithValue("@user", added_by.Text.ToString());
int k = command1.ExecuteNonQuery();
if (k > 0)
{
MessageBox.Show("Data Added Successfully");
c.Close();
return;
}
else
{
MessageBox.Show("Data was not added successfully - try again later");
c.Close();
return;
}
}
}
catch (Exception ex)
{
MessageBox.Show("Failed To Open Connection :." + ex);
return;
}
}
当我运行代码并尝试插入数据时,出现错误
无法将NULL值插入列“ item_id”表中
NOT NULL
意味着您不能将NULL
它们插入需要显式插入的列中。
设置IDENTITY(1,1)
将以item_id
1的种子自动插入。
像这样更改您的定义
CREATE TABLE [dbo].[Items] (
[item_id] INT NOT NULL IDENTITY(1, 1),
[item_name] VARCHAR (50) NULL,
[item_model] VARCHAR (50) NULL,
[item_price] VARCHAR (50) NULL,
[item_quantity] VARCHAR (50) NULL,
[entry_date] VARCHAR (50) NULL,
[user_id] VARCHAR (50) NULL,
PRIMARY KEY CLUSTERED ([item_id] ASC)
);
或者
明确地将其插入数据库
string query = @"Insert into Items(item_id,item_name,item_model,item_price,item_quantity,entry_date,user_id)" +
"VALUES(@item_id,@name, @model, @price, @quantity, @date,@user)";
停止使用.AddWithValues
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