Question

如何在Visual Studio中执行此操作？我在数据集设计中设置了Autoincrement = true，并在数据库图表中的标识规范中设置了“YES”。还有什么？

但是现在如何添加数据？当我尝试这样做但我有一个例外。代码。

 cmd = new SqlCommand("Insert into Subject" +
                " Values (namesubject,numberoflect,numberofpract)", conn);
            SqlParameter param = new SqlParameter();
            //param.ParameterName = "@idsubject";
            //param.Value = Convert.ToInt32(textBox1.Text);
            //param.SqlDbType = SqlDbType.Int;
            //cmd.Parameters.Add(param);
            //param = new SqlParameter();
            param.ParameterName = "namesubject";
            param.Value = textBox2.Text;
            param.SqlDbType = SqlDbType.Text;
            cmd.Parameters.Add(param);
            param = new SqlParameter();
            param.ParameterName = "numberoflect";
            if (textBox3.Text == "")
                textBox3.Text = "0";
            param.Value = Convert.ToInt32(textBox3.Text);
            param.SqlDbType = SqlDbType.Int;
            cmd.Parameters.Add(param);
            param = new SqlParameter();
            param.ParameterName = "numberofpract";
            if (textBox4.Text == "")
                textBox4.Text = "0";
            param.Value = Convert.ToInt32(textBox3.Text);
            param.SqlDbType = SqlDbType.Int;
            cmd.Parameters.Add(param);
            cmd.ExecuteNonQuery();

自动增量字段 - 此表中的ids主题。

Answer 1

首先将idsubject的自动标识设置为true

OR

 Create table ....
(
   idsubject int Auto identity (1,1) not null
   ....
   ....
)

并修改您的插入代码，如

cmd = new SqlCommand("Insert into Subject(namesubject, numberoflect, numberofpract)" +
            " Values ('"+textBox2.Text+"',"+textBox3.Text+","+textBox3.Text+")", conn);

   cmd.ExecuteNonQuery();

如何在表中设置自动增量Id并添加数据

1 个答案: