using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        SqlConnection myconnection;
        SqlCommand mycommand;
        SqlDataReader myreader;
        string str = Properties.Settings.Default.connection;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            myconnection = new SqlConnection(str);
            myconnection.Open();
            string biao = this.textBox1.Text.Trim();
            //建立帶有一個自增欄位的表
            mycommand = new SqlCommand("create table ["+biao+"]([123] int IDENTITY (1,1) PRIMARY KEY,[12] nvarchar(50))", myconnection);
           // mycommand.Parameters.AddWithValue("@gongsi",this.textBox1.Text.Trim());
            myreader = mycommand.ExecuteReader();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            myconnection = new SqlConnection(str);
            myconnection.Open();
            string ziduan = this.textBox2.Text.Trim();
            //往表裡新增新欄位
            mycommand = new SqlCommand("alter table [阿里巴巴網路技術有限公司] add [" + ziduan + "] nvarchar(50)",myconnection);
            myreader = mycommand.ExecuteReader();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            myconnection = new SqlConnection(str);
            myconnection.Open();
           //判斷一個欄位是否在一個表裡
            mycommand = new SqlCommand("SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE (TABLE_NAME [email protected] and [email protected])",myconnection);
            mycommand.Parameters.AddWithValue("@biao", this.textBox2.Text);
            mycommand.Parameters.AddWithValue("@ziduan", this.textBox3.Text);
            myreader = mycommand.ExecuteReader();
            if (myreader.Read())
            {
                MessageBox.Show("1");
            }
            else
            {
                MessageBox.Show("2");
            }
        }
    }
}