20131207-ADO.NET-第十六天

[1]快捷键

工具箱：ctrl+w+x 首字母定位控件范围

属性：F4 或ctrl+w+p Tab跳转 ，home 与end也有效

[2]连接字符串

string str = "Data Source=xy-pc;Initial Catalog=myitcast;Integrated Security=true";

[*]

[3]

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 _06大项目

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

 

private void btnAdd_Click(object sender, EventArgs e)

{

//获取文本框的内容--要判断(你们做)

string name = txtAddName.Text;//姓名

int gender = txtAddGender.Text == "男" ? 1 : txtAddGender.Text == "女" ? 0 : 2;//站着埋-坑//大坑

//判断一下性别的值 是1还是0 如果都不是则告诉用户输入错误请重新输入(留给你们了)

int age = Convert.ToInt32(txtAddAge.Text);//年龄--坑(留给你们了)

string phone = txtAddPhone.Text;//电话号码

//创建连接字符串

string str = "Data Source=xy-pc;Initial Catalog=myitcast;Integrated Security=true";

int count = -1;

//连接数据库

using (SqlConnection con = new SqlConnection(str))

{

string sql = string.Format("insert INTO TblStudent(TSName,TSGender,TSAge,TSPhone,tclassid)VALUES('{0}',{1},{2},'{3}',{4})", name, gender, age, phone, 1);

using (SqlCommand cmd = new SqlCommand(sql, con))

{

//打开数据库

con.Open();

count = cmd.ExecuteNonQuery();//执行sql语句

}

}

//执行sql语句

if (count > 0)

{

MessageBox.Show("添加成功");

}

else

{

MessageBox.Show("添加失败");

}

//结果

}

 

private void Form1_Load(object sender, EventArgs e)

{

LoadAllStudent();//加载学生

 

 

}

 

private void LoadAllStudent()

{

//创建一个集合,存储每个学生对象

List<Student> list = new List<Student>();

//封装成方法---还要刷新呢

//查询所有的数据

string str = "Data Source=xy-pc;Initial Catalog=myitcast;Integrated Security=true";//创建连接字符串

//连接数据库

using (SqlConnection con = new SqlConnection(str))

{

string sql = "select tsid, TSName,TSGender,TSAge,TSPhone FROM TblStudent";

using (SqlCommand cmd = new SqlCommand(sql, con))

{

con.Open();//打开数据库

using (SqlDataReader sda = cmd.ExecuteReader())

{

if (sda.HasRows)//如果为true证明至少有一条数据

{

while (sda.Read())//读取到下一条

{

// sda[1]//每一列的数据

 

Student stu = new Student();//创建一个学生对象

stu.TSId = sda.GetInt32(0);//主键id的值

stu.TSName = sda["tsname"].ToString();

stu.TSGender = sda.GetBoolean(2) == true ? '男' : '女';

stu.TSAge = sda.GetInt32(3);//年龄

stu.TSPhone = sda.GetString(4);

list.Add(stu);

}

}

}

}

}

 

dgv.DataSource = list;//把集合绑定到控件上

}

 

private void deletetsm_Click(object sender, EventArgs e)

{

//首先判断用户是否选中行

if (dgv.SelectedRows.Count > 0)

{

int count=-1;

string id = dgv.SelectedRows[0].Cells[0].Value.ToString();

//创建连接字符串

string str = "Data Source=xy-pc;Initial Catalog=myitcast;Integrated Security=true";

//连接数据库

using (SqlConnection con=new SqlConnection(str))

{

string sql = "delete from tblstudent where tsid="+id;

using (SqlCommand cmd=new SqlCommand(sql,con))

{

con.Open();

count =cmd.ExecuteNonQuery();

 

}// end using

}//end using

if (count>0)

{

LoadAllStudent();

MessageBox.Show("删除成功");

}

else

{

MessageBox.Show("删除失败");

}

 

}//end if

 

 

 

//获取选中行的id

 

//MessageBox.Show("删除了");

}

 

private void dgv_RowEnter(object sender, DataGridViewCellEventArgs e)

{

//是否有选中的行

if (dgv.SelectedRows.Count>0)

{

//获取 id 姓名 性别 年龄

 

labId.Text = dgv.SelectedRows[0].Cells[0].Value.ToString();//id的值

//姓名

txtUpName.Text = dgv.SelectedRows[0].Cells[1].Value.ToString();

//性别

txtUpGender.Text = dgv.SelectedRows[0].Cells[2].Value.ToString();

//年龄

txtUpPhone.Text = dgv.SelectedRows[0].Cells[3].Value.ToString();

txtUpAge.Text = dgv.SelectedRows[0].Cells[4].Value.ToString();

}

}

 

private void btnUpdate_Click(object sender, EventArgs e)

{

int count = -1;

//首先获取 当前选中行的id

string id = labId.Text;

//int gender = txtUpGender.Text == "男" ? 1 : txtUpGender.Text == "女" ? 0 : 2;

int gender = txtUpGender.Text == "男" ? 1 : 0;

// 创建连接数据库的字符串

string str = "Data Source=xy-pc;Initial Catalog=myitcast;Integrated Security=true";

//连接数据库

using (SqlConnection con=new SqlConnection(str))

{

 

string sql =string.Format( "update tblstudent set TSName='{0}',TSGender={1},TSAge={2},TSPhone='{3}' where tsid={4}",txtUpName.Text,gender,txtUpAge.Text,txtUpPhone.Text,id);

using (SqlCommand cmd=new SqlCommand(sql,con))

{

con.Open(); //打开数据库

count= cmd.ExecuteNonQuery();

}

}

if (count>0)

{

LoadAllStudent();//刷新

MessageBox.Show("修改成功");

}

else

{

MessageBox.Show("修改失败");

}

 

 

//执行

}

 

private void btnCount_Click(object sender, EventArgs e)

{

 

string count = "";

//创建连接字符串

string str = "Data Source=xy-pc;Initial Catalog=MyItcast;Integrated Security=True";

//连接数据库

using (SqlConnection con=new SqlConnection(str))

{

string sql = "select count(*) from tblstudent";

using (SqlCommand cmd=new SqlCommand(sql,con))

{

con.Open();//打开数据库

count= cmd.ExecuteScalar().ToString();

}

}

//打开数据库

MessageBox.Show("一共有"+count+"个童鞋");

//执行sql语句

}

 

 

}

}

//数据转对象

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

 

namespace _06大项目

{

public class Student

{

// TSId, TSName, TSGender, TSAddress, TSPhone, TSAge, TSBirthday, TSCardId, TClassId

//用到哪列写哪列

 

//查询四列

 

private int _tSId;

 

public int TSId

{

get { return _tSId; }

set { _tSId = value; }

}

private string _tSName;

 

public string TSName

{

get { return _tSName; }

set { _tSName = value; }

}

private char _tSGender; //坑

 

public char TSGender

{

get { return _tSGender; }

set { _tSGender = value; }

}

private string _tSPhone;

 

public string TSPhone

{

get { return _tSPhone; }

set { _tSPhone = value; }

}

private int _tSAge;

 

public int TSAge

{

get { return _tSAge; }

set { _tSAge = value; }

}

 

 

 

}

}