C#练习DataReader（转载）

本文转自http://www.cnblogs.com/Mysterious/p/3422901.html

SQL代码：

create database ThreeDb

go

USE ThreeDb;

GO

CREATE TABLE classify   --分类表

(

    id int primary key identity(1,1),

    name nvarchar(20) not null

)

GO

CREATE TABLE product  --产品表

(

    id int primary key identity(1,1),

    name nvarchar(20) not null,

    price decimal,

    number int default 0,

    c_id int FOREIGN KEY references classify(id)

)

GO

CREATE TABLE users

(

    id int primary key identity(1,1),

    name nvarchar(20) not null,

    pwd nvarchar(20) not null

)

GO

--添加分类测试数据

insert into classify(name) values('图书');

insert into classify(name) values('家电');

insert into classify(name) values('服饰');

--添加users的测试数据

insert into users(name,pwd) values('admin','admin');

--添加商品测试数据

insert into product(name,price,number,c_id) values('arduino基础版',168,50,1);

insert into product(name,price,number,c_id) values('arduino提高版',268,50,1);

insert into product(name,price,number,c_id) values('arduino至尊版',468,50,1);

insert into product(name,price,number,c_id) values('比基尼',68,50,3);

insert into product(name,price,number,c_id) values('虎皮裙',168,50,3);

insert into product(name,price,number,c_id) values('长靴',368,50,3);

insert into product(name,price,number,c_id) values('电冰箱',3268,50,2);

insert into product(name,price,number,c_id) values('烘干机',2268,50,2);

GO

select count(*) from users where name='admin' and pwd='admin'

go

select count(*) from users where name='xxxdadad' or 1=1 --' and pwd='admin'

go

select * from classify;

go

select * from product order by c_id;

go

--无返回值

--用途：删除一条记录

CREATE PROCEDURE UP_Product_Delete

@id int

AS

    DELETE [product] WHERE id=@id

GO

--用途：修改一条记录

CREATE PROCEDURE UP_Product_Update

@id int,

@name nvarchar(20),

@price decimal(18,0),

@number int,

@c_id int

AS

    UPDATE [product] SET

    [name]=@name,[price]=@price,[number]=@number,[c_id]=@c_id

    WHERE id=@id

GO

--有返回值

--用途：增加一条记录

CREATE PROCEDURE UP_Product_ADD

@id int output,--这是返回数据

@name nvarchar(20),

@price decimal(18,0),

@number int,

@c_id int

AS

    INSERT INTO [product]([name],[price],[number],[c_id])

    VALUES(@name,@price,@number,@c_id)

    SET @id= @@IDENTITY

GO

--用途：是否已经存在

CREATE PROCEDURE UP_Product_Exist

@id int

AS

    DECLARE @TempID int

    SELECT @TempID = count(1) FROM [product] WHERE id=@id

    IF @TempID = 0

        RETURN 0

    ELSE

        RETURN 1

GO

--返回结果集

--用途：得到实体对象的详细信息

CREATE PROCEDURE UP_Product_GetModel

@id int

AS

    SELECT id,name,price,number FROM [product] WHERE id = @id

GO

--用途：查询记录信息

CREATE PROCEDURE UP_Product_GetList

AS

    SELECT id,name,price,number,c_id FROM [Product]

GO

--ALTER 更新

--drop 删除

winform代码

Product.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.SqlClient;

using System.Configuration;

using System.Data;

namespace ADO.NET.SQL

{

    public class Product

    {

        string connstr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;

        public Product()

        {

        }

        public Product(int _id,string _n,decimal _p,int _num,int _c_id)

        {

            ID = _id;

            Name = _n;

            Price = _p;

            Number = _num;

            C_id = _c_id;

        }

        public int ID

        {

            get;

            set;

        }

        public string Name

        {

            get;

            set;

        }

        public decimal Price

        {

            get;

            set;

        }

        public int Number

        {

            get;

            set;

        }

        public int C_id

        {

            get;

            set;

        }

        /// <summary>

        /// 增加一种商品

        /// </summary>

        /// <param name="_n">名字</param>

        /// <param name="_p">价格</param>

        /// <param name="_num">库存</param>

        /// <param name="_c_id">所属分类</param>

        /// <returns>true、false</returns>

        public bool Add(string _n, decimal _p, int _num, int _c_id)

        {

            //using (SqlConnection conn = new SqlConnection(connstr))

            //{

            //    string sql = "insert into product(name,price,number,c_id) values('"+_n+"',"+ _p +","+ _num +","+ _c_id + ")";

            //    SqlCommand cmd = new SqlCommand(sql, conn);

            //    conn.Open();

            //    int i = cmd.ExecuteNonQuery();

            //    if (i > 0)

            //        return true;

            //    else

            //        return false;

            //} 

            using (SqlConnection conn = new SqlConnection(connstr))

            {

                string sql = "UP_Product_ADD";

                SqlCommand cmd = new SqlCommand(sql, conn);

                cmd.CommandType = CommandType.StoredProcedure;

                cmd.Parameters.AddWithValue("@name", _n);

                cmd.Parameters.AddWithValue("@price", _p);

                cmd.Parameters.AddWithValue("@number", _num);

                cmd.Parameters.AddWithValue("@c_id", _c_id);

                SqlParameter pid = new SqlParameter("@id",);

                pid.Direction = ParameterDirection.Output;

                cmd.Parameters.Add(pid);

                conn.Open();

                int i = cmd.ExecuteNonQuery();

                //System.Windows.Forms.MessageBox.Show(cmd.Parameters["@id"].Value.ToString());

                if (i > )

                    return true;

                else

                    return false;

            }

        }

        public void Exists(int _id)

        {

            try

            {

                using (SqlConnection conn = new SqlConnection(connstr))

                {

                    string sql = "UP_Product_Exist";

                    SqlCommand cmd = new SqlCommand(sql, conn);

                    conn.Open();

                    cmd.CommandType = CommandType.StoredProcedure;

                    SqlParameter pid = new SqlParameter("@id", _id);

                    pid.Direction = ParameterDirection.Input;

                    cmd.Parameters.Add(pid);

                    SqlParameter rv = new SqlParameter("@returnvalue", SqlDbType.Int, );

                    rv.Direction = ParameterDirection.ReturnValue;

                    cmd.Parameters.Add(rv);

                    int i = cmd.ExecuteNonQuery();

                    string str1 = cmd.Parameters["@returnvalue"].Value.ToString();

                    if (str1 == "")

                    {

                        System.Windows.Forms.MessageBox.Show("未查到相同的商品ID");

                    }

                    else

                    {

                        System.Windows.Forms.MessageBox.Show("该商品ID已经存在");

                    }

                    //if (i > 0)

                    //    return true;

                    //else

                    //    return false;

                }

            }

            catch (Exception exp)

            {

                System.Windows.Forms.MessageBox.Show(exp.Message);

            }

        }

        /// <summary>

        /// 更新一种商品

        /// </summary>

        /// <param name="_id">id</param>

        /// <param name="_n">名字</param>

        /// <param name="_p">价格</param>

        /// <param name="_num">库存</param>

        /// <param name="_c_id">所属分类</param>

        /// <returns>true、false</returns>

        public bool Update(int _id, string _n, decimal _p, int _num, int _c_id)

        {

            //using (SqlConnection conn = new SqlConnection(connstr))

            //{

            //    string sql = "UPDATE product SET name='" + _n + "',price = " + _p + ",number=" + _num + ",c_id=" + _c_id + "WHERE id=" + _id;

            //    SqlCommand cmd = new SqlCommand(sql, conn);

            //    conn.Open();

            //    int i = cmd.ExecuteNonQuery();

            //    if (i > 0)

            //        return true;

            //    else

            //        return false;

            //}

            using (SqlConnection conn = new SqlConnection(connstr))

            {

                string sql = "UP_Product_Update";

                SqlCommand cmd = new SqlCommand(sql, conn);

                cmd.CommandType = CommandType.StoredProcedure;

                cmd.Parameters.AddWithValue("@id", _id);

                cmd.Parameters.AddWithValue("@name", _n);

                cmd.Parameters.AddWithValue("@price", _p);

                cmd.Parameters.AddWithValue("@number", _num);

                cmd.Parameters.AddWithValue("@c_id", _c_id);

                conn.Open();

                int i = cmd.ExecuteNonQuery();

                if (i > )

                    return true;

                else

                    return false;

            }

        }

        /// <summary>

        /// 移除一个

        /// </summary>

        /// <param name="_id">id</param>

        /// <returns>true、false</returns>

        public bool Remove(int _id)

        {

            //使用SQL语句

            //using (SqlConnection conn = new SqlConnection(connstr))

            //{

            //    string sql = "delete from product WHERE id=" + _id;

            //    SqlCommand cmd = new SqlCommand(sql, conn);

            //    conn.Open();

            //    int i = cmd.ExecuteNonQuery();

            //    if (i > 0)

            //        return true;

            //    else

            //        return false;

            //}

            //使用SQL方法

            using (SqlConnection conn = new SqlConnection(connstr))

            {

                string sql = "UP_Product_Delete";

                SqlCommand cmd = new SqlCommand(sql, conn);

                cmd.CommandType = CommandType.StoredProcedure;

                cmd.Parameters.AddWithValue("@id", _id);

                conn.Open();

                int i = cmd.ExecuteNonQuery();

                if (i > )

                    return true;

                else

                    return false;

            }

        }

        /// <summary>

        /// 获取商品列表

        /// </summary>

        /// <returns>泛型</returns>

        public Dictionary<int, Product> GetAll()

        {

            //Dictionary<int, Product> plist = new Dictionary<int, Product>();

            //using (SqlConnection conn = new SqlConnection(connstr))

            //{

            //    string sql = "select * from product";

            //    SqlCommand cmd = new SqlCommand(sql, conn);

            //    conn.Open();

            //    SqlDataReader sdr = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);

            //    while (sdr.Read())

            //    {

            //        Product p = new Product(

            //            Convert.ToInt32(sdr["id"]),

            //            sdr["name"].ToString(),

            //            Convert.ToDecimal(sdr["price"]),

            //            Convert.ToInt32(sdr["number"]),

            //            Convert.ToInt32(sdr["c_id"])

            //            );

            //        plist.Add(Convert.ToInt32(sdr["id"]), p);

            //    }

            //    sdr.Close();

            //}

            //return plist;

            Dictionary<int, Product> plist = new Dictionary<int, Product>();

            using (SqlConnection conn = new SqlConnection(connstr))

            {

                string sql = "UP_Product_GetList";

                SqlCommand cmd = new SqlCommand(sql, conn);

                cmd.CommandType = CommandType.StoredProcedure;

                conn.Open();

                SqlDataReader sdr = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);

                while (sdr.Read())

                {

                    Product p = new Product(

                        Convert.ToInt32(sdr["id"]),

                        sdr["name"].ToString(),

                        Convert.ToDecimal(sdr["price"]),

                        Convert.ToInt32(sdr["number"]),

                        Convert.ToInt32(sdr["c_id"])

                        );

                    plist.Add(Convert.ToInt32(sdr["id"]), p);

                }

                sdr.Close();

            }

            return plist;

        }

    }

}

Classify.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.SqlClient;

using System.Configuration;

namespace ADO.NET.SQL

{

    public class Classify

    {

        string connstr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;

        public int ID

        {

            get;

            set;

        }

        public string Name

        {

            get;

            set;

        }

        /// <summary>

        /// 获取所有分类

        /// </summary>

        /// <returns>分类</returns>

        public SqlDataReader GetAll()

        {

            SqlConnection conn = new SqlConnection(connstr);

            SqlCommand cmd = new SqlCommand("select * from classify", conn);

            conn.Open();

            SqlDataReader sdr = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection);

            //不推荐

            return sdr;

        }

        /// <summary>

        /// 通过id获取名字

        /// </summary>

        /// <param name="cid"></param>

        /// <returns></returns>

        public string GetCName(int cid)

        {

            using (SqlConnection conn = new SqlConnection(connstr))

            {

                SqlCommand cmd = new SqlCommand("select name from classify where id=" + cid.ToString(), conn);

                conn.Open();

                string str1 = cmd.ExecuteScalar().ToString();

                return str1;

            }

        }

        /// <summary>

        /// 通过名字获取id

        /// </summary>

        /// <param name="name"></param>

        /// <returns></returns>

        public int GetCid(string name)

        {

            using (SqlConnection conn = new SqlConnection(connstr))

            {

                SqlCommand cmd = new SqlCommand("select id from classify where name=" + name, conn);

                conn.Open();

                return Convert.ToInt32(cmd.ExecuteScalar());

            }

        }

    }

}

Form1.cs

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;

using System.Configuration;

namespace ADO.NET.SQL

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            Bind();

        }

        private void Bind()

        {

            listView1.Items.Clear();

            Classify c = new Classify();

            Product p = new Product();

            ListViewItem lvi;

            foreach (Product pr in p.GetAll().Values)

            {

                lvi = new ListViewItem(pr.ID.ToString());

                lvi.SubItems.Add(pr.Name);

                lvi.SubItems.Add(pr.Price.ToString());

                lvi.SubItems.Add(pr.Number.ToString());

                lvi.SubItems.Add(c.GetCName(pr.C_id));

                listView1.Items.Add(lvi);

            }

            SqlDataReader sdr = c.GetAll();

            while (sdr.Read())

            {

                comboBox1.Items.Add(sdr[] + "-->" + sdr[]);

            }

            sdr.Close();

        }

        private void listView1_SelectedIndexChanged(object sender, EventArgs e)

        {

            if (listView1.SelectedItems.Count != )

            {

                lbl_id.Text = listView1.SelectedItems[].Text;

                tb_name.Text = listView1.SelectedItems[].SubItems[].Text;

                tb_price.Text = listView1.SelectedItems[].SubItems[].Text;

                tb_number.Text = listView1.SelectedItems[].SubItems[].Text;

                string cname = listView1.SelectedItems[].SubItems[].Text;

                for (int i = ; i < comboBox1.Items.Count; i++)

                {

                    int index = comboBox1.Items[i].ToString().IndexOf("-->") + ;//得到箭头结束的位置

                    if (comboBox1.Items[i].ToString().Substring(index) == cname)

                    {

                        comboBox1.SelectedIndex = i;

                    }

                }

            }

        }

        /// <summary>

        /// 修改

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void button2_Click(object sender, EventArgs e)

        {

            try

            {

                int id = int.Parse(lbl_id.Text);

                int index = comboBox1.Text.IndexOf("-->");

                int cid = int.Parse(comboBox1.Text.Substring(, index));

                Product p = new Product();

                if (

                    p.Update

                    (

                        id,

                        tb_name.Text,

                        decimal.Parse(tb_price.Text),

                        int.Parse(tb_number.Text),

                        cid

                    )

                  )

                {

                    Bind();

                }

                else

                {

                    MessageBox.Show("没修改成功哦！");

                }

            }

            catch (Exception exp)

            {

                MessageBox.Show(exp.Message);

            }

        }

        /// <summary>

        /// 添加

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void button3_Click(object sender, EventArgs e)

        {

            try

            {

                Product p = new Product();

                int index = comboBox1.Text.IndexOf("-->");

                int cid = int.Parse(comboBox1.Text.Substring(, index));

                if (

                    p.Add

                    (

                        tb_name.Text,

                        decimal.Parse(tb_price.Text),

                        int.Parse(tb_number.Text),

                        cid

                    )

                  )

                {

                    Bind();

                }

                else

                {

                    MessageBox.Show("没添加成功哦！");

                }

            }

            catch(Exception exp)

            {

                MessageBox.Show(exp.Message);

            }

        }

        /// <summary>

        /// 删除商品

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void button1_Click(object sender, EventArgs e)

        {

            try

            {

                int id = int.Parse(lbl_id.Text);

                Product p = new Product();

                if (

                    p.Remove(id)

                  )

                {

                    Bind();

                }

                else

                {

                    MessageBox.Show("没删除成功哦！");

                }

            }

            catch (Exception exp)

            {

                MessageBox.Show(exp.Message);

            }

        }

        private void button6_Click(object sender, EventArgs e)

        {

            try

            {

                Product p = new Product();

                p.Exists(int.Parse(tb_Exist.Text));

            }

            catch (Exception exp)

            {

                MessageBox.Show(exp.Message);

            }

        }

    }

}

app.config

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

  <connectionStrings>

    <add name="constr" connectionString="server=QT-201303030913;database=ThreeDb;uid=sa;pwd=*******"/>

  </connectionStrings>

</configuration>

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