【笔记】数据库实例代码

一。数据库基本概念：
数据、数据库。数据模型/DBMS（数据库管理系统）/DBS（数据库系统）
二。数据库内部组成
二维表、视图，索引
三，数据库管理系统主要功能：
六大功能
四数据库操作语言：
SQL语言实现增删查改*一。数据库基本概念：
数据、数据库。数据模型/DBMS（数据库管理系统）/DBS（数据库系统）
二。数据库内部组成
二维表、视图，索引
三，数据库管理系统主要功能：
六大功能
四数据库操作语言：
SQL语言实现增删查改
实验内容：
1.用VS2010创建名为
insert into T_Student(sno,sname,ssex,sage,sdept) values('','','','','')
select * from T_Student
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2001','李勇','男','20','CS')
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2002','刘晨','女','18','CS')
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2003','王敏','女','19','MA')
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2004','张立','男','22','IS')
insert into T_Course(Cno,Cname,Ccode) values ('1','数据库','1')
insert into T_Course(Cno,Cname,Ccode) values ('2','英语','4')
insert into T_SC(Cno,Sno,Grade) values ('1','2001','88')
insert into T_SC(Cno,Sno,Grade) values ('2','2002','80')
增加一条学号为2006，姓名为张扬
insert into T_student(sno,sname,ssex) values ('','','')
(sno,sname,ssex,sage,sdept) ('','','','','')空字符串
select * from t_student where sname='李勇'
select * from t_student where ssex='女'
select sdept from t_student where sname='张立'
select count() from T_student
select max() from t_student
update t_student set ssex='女' where sno='2001'
update t_student set sage='22' where sname='王敏'
update t_student sdept='MA' where ssex='男'

insert into T_Student (sno,sname,ssex) values ('2006','张扬','男')
delete from t_student where sno='2006'
delete from t_student where sage=22

create table t_course(
cno int primary key,
cname varchar(10),
ccode int
);
create view as(
select sno,sname,cno,cname,grade from t_student,t_sc,t_course where t_student.sno=t_sc.sno and
t_sc. cno=t_course.cno
);
一。数据库基本概念：
数据、数据库。数据模型/DBMS（数据库管理系统）/DBS（数据库系统）
二。数据库内部组成
二维表、视图，索引
三，数据库管理系统主要功能：
六大功能
四数据库操作语言：
SQL语言实现增删查改
实验内容：
1.用VS2010创建名为
insert into T_Student(sno,sname,ssex,sage,sdept) values('','','','','')
select * from T_Student
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2001','李勇','男','20','CS')
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2002','刘晨','女','18','CS')
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2003','王敏','女','19','MA')
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2004','张立','男','22','IS')
insert into T_Course(Cno,Cname,Ccode) values ('1','数据库','1')
insert into T_Course(Cno,Cname,Ccode) values ('2','英语','4')
insert into T_SC(Cno,Sno,Grade) values ('1','2001','88')
insert into T_SC(Cno,Sno,Grade) values ('2','2002','80')
增加一条学号为2006，姓名为张扬
insert into T_student(sno,sname,ssex) values ('','','')
(sno,sname,ssex,sage,sdept) ('','','','','')空字符串
select * from t_student where sname='李勇'
select * from t_student where ssex='女'
select sdept from t_student where sname='张立'
select count() from T_student
select max() from t_student
update t_student set ssex='女' where sno='2001'
update t_student set sage='22' where sname='王敏'
update t_student sdept='MA' where ssex='男'

insert into T_Student (sno,sname,ssex) values ('2006','张扬','男')
delete from t_student where sno='2006'
delete from t_student where sage=22

``*
实验内容：
1.用VS2010创建名为
insert into T_Student(sno,sname,ssex,sage,sdept) values('','','','','')
select * from T_Student
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2001','李勇','男','20','CS')
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2002','刘晨','女','18','CS')
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2003','王敏','女','19','MA')
insert into T_Student(Sno,Sname,Ssex,Sage,Sdept) values ('2004','张立','男','22','IS')
insert into T_Course(Cno,Cname,Ccode) values ('1','数据库','1')
insert into T_Course(Cno,Cname,Ccode) values ('2','英语','4')
insert into T_SC(Cno,Sno,Grade) values ('1','2001','88')
insert into T_SC(Cno,Sno,Grade) values ('2','2002','80')
增加一条学号为2006，姓名为张扬
insert into T_student(sno,sname,ssex) values ('','','')
(sno,sname,ssex,sage,sdept) ('','','','','')空字符串
select * from t_student where sname='李勇'
select * from t_student where ssex='女'
select sdept from t_student where sname='张立'
select count() from T_student
select max() from t_student
update t_student set ssex='女' where sno='2001'
update t_student set sage='22' where sname='王敏'
update t_student sdept='MA' where ssex='男'

insert into T_Student (sno,sname,ssex) values ('2006','张扬','男')
delete from t_student where sno='2006'
delete from t_student where sage=22

课程二：

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 WindowsFormsApplication2
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        try 
        {
            string strCon = "Data Source =.\\sqlexpress;Initial Catalog=XSGL;Integrated Security=True";
            SqlConnection mycon = new SqlConnection(strCon);
            mycon.Open();

            

            

            string StrUpd = "update T_Student set sage='25' where sname='张立'";
            SqlCommand mycmd = new SqlCommand(StrUpd, mycon);
            mycmd.ExecuteNonQuery();

            string strSel = "select sno as 学号,sname as 姓名,ssex as 性别,sage as 年龄,sdept as 专业 from T_Student";
            SqlDataAdapter myda = new SqlDataAdapter(strSel, mycon);
            DataTable dt = new DataTable();
            myda.Fill(dt);
            dataGridView1.DataSource = dt;

            MessageBox.Show("update sucess!");
            mycon.Close();
            
        }
            //MessageBox.Show("update sucess!");
        catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
    }
}
}

直接界面能改

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 shujuku
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        try
        {
            string strCon = "Data Source =.\\sqlexpress;Initial Catalog=XSGL;Integrated Security=True";
            SqlConnection mycon = new SqlConnection(strCon);
            mycon.Open();





            //string StrUpd = "update T_Student set sage='25' where sname='张立'";
            //SqlCommand mycmd = new SqlCommand(StrUpd, mycon);
            //mycmd.ExecuteNonQuery();

            string strSel = "select sno as 学号,sname as 姓名,ssex as 性别,sage as 年龄,sdept as 专业 from T_Student";
            SqlDataAdapter myda = new SqlDataAdapter(strSel, mycon);
            DataTable dt = new DataTable();
            myda.Fill(dt);
            dataGridView1.DataSource = dt;

            //string StrUpd = "update T_Student set sname='李晨' where sno='2001'";
            //SqlCommand mycmd = new SqlCommand(StrUpd, mycon);
            //mycmd.ExecuteNonQuery();

            //MessageBox.Show("update sucess!");
            mycon.Close();

        }
        //MessageBox.Show("update sucess!");
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        string strCon = "Data Source =.\\sqlexpress;Initial Catalog=XSGL;Integrated Security=True";
        SqlConnection mycon = new SqlConnection(strCon);
        mycon.Open();

        string sname = textBox1.Text;
        string sage = textBox2.Text;



        string StrUpd = "update T_Student set sage='" + sage + "' where sname='" + sname + "'";
        SqlCommand mycmd = new SqlCommand(StrUpd, mycon);
        mycmd.ExecuteNonQuery();

        string strSel = "select sno as 学号,sname as 姓名,ssex as 性别,sage as 年龄,sdept as 专业 from T_Student";
        SqlDataAdapter myda = new SqlDataAdapter(strSel, mycon);
        DataTable dt = new DataTable();
        myda.Fill(dt);
        dataGridView1.DataSource = dt;

        

        MessageBox.Show("update sucess!");
        mycon.Close();
    }

    private void richTextBox1_TextChanged(object sender, EventArgs e)
    {

    }

    private void button3_Click(object sender, EventArgs e)
    {

    }
}
}

界面添加信息

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 shujuku
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Form1_Load(object sender, EventArgs e)
{
try
{
string strCon = "Data Source =.\\sqlexpress;Initial Catalog=XSGL;Integrated Security=True";
SqlConnection mycon = new SqlConnection(strCon);
mycon.Open();





//string StrUpd = "update T_Student set sage='25' where sname='张立'";
//SqlCommand mycmd = new SqlCommand(StrUpd, mycon);
//mycmd.ExecuteNonQuery();

string strSel = "select sno as 学号,sname as 姓名,ssex as 性别,sage as 年龄,sdept as 专业 from T_Student";
SqlDataAdapter myda = new SqlDataAdapter(strSel, mycon);
DataTable dt = new DataTable();
myda.Fill(dt);
dataGridView1.DataSource = dt;

//string StrUpd = "update T_Student set sname='李晨' where sno='2001'";
//SqlCommand mycmd = new SqlCommand(StrUpd, mycon);
//mycmd.ExecuteNonQuery();

//MessageBox.Show("update sucess!");
mycon.Close();

}
//MessageBox.Show("update sucess!");
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}

private void button1_Click(object sender, EventArgs e)
{
string strCon = "Data Source =.\\sqlexpress;Initial Catalog=XSGL;Integrated Security=True";
SqlConnection mycon = new SqlConnection(strCon);
mycon.Open();

string sname = textBox1.Text;
string sage = textBox2.Text;
string sno = textBox3.Text;
string ssex = textBox4.Text;
string sdept = textBox5.Text;



//string StrUpd = "update T_Student set sage='" + sage + "' where sname='" + sname + "'";
string StrUpd = "insert into T_Student(Sno,Sname,Ssex,Sage,Sdept)  values ('"+sno+"','"+sname+"','"+ssex+"','"+sage+"','"+sdept+"')";

SqlCommand mycmd = new SqlCommand(StrUpd, mycon);
mycmd.ExecuteNonQuery();

string strSel = "select sno as 学号,sname as 姓名,ssex as 性别,sage as 年龄,sdept as 专业 from T_Student";
   
SqlDataAdapter myda = new SqlDataAdapter(strSel, mycon);
DataTable dt = new DataTable();
myda.Fill(dt);
dataGridView1.DataSource = dt;



MessageBox.Show("update sucess!");
mycon.Close();
}

private void richTextBox1_TextChanged(object sender, EventArgs e)
{

}

private void button3_Click(object sender, EventArgs e)
{

}
}
}

==================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================

最后编辑于：2017.12.10 10:21:12

人面猴
序言：七十年代末，一起剥皮案震惊了整个滨河市，随后出现的几起案子，更是在滨河造成了极大的恐慌，老刑警刘岩，带你破解...
沈念sama阅读 211,884评论 6赞 492
死咒
序言：滨河连续发生了三起死亡事件，死亡现场离奇诡异，居然都是意外死亡，警方通过查阅死者的电脑和手机，发现死者居然都...
沈念sama阅读 90,347评论 3赞 385
救了他两次的神仙让他今天三更去死
文/潘晓璐我一进店门，熙熙楼的掌柜王于贵愁眉苦脸地迎上来，“玉大人，你说我怎么就摊上这事。” “怎么了？”我有些...
开封第一讲书人阅读 157,435评论 0赞 348
道士缉凶录：失踪的卖姜人
文/不坏的土叔我叫张陵，是天一观的道长。经常有香客问我，道长，这世上最难降的妖魔是什么？我笑而不...
开封第一讲书人阅读 56,509评论 1赞 284
港岛之恋（遗憾婚礼）
正文为了忘掉前任，我火速办了婚礼，结果婚礼上，老公的妹妹穿的比我还像新娘。我一直安慰自己，他们只是感情好，可当我...
茶点故事阅读 65,611评论 6赞 386
恶毒庶女顶嫁案：这布局不是一般人想出来的
文/花漫我一把揭开白布。她就那样静静地躺着，像睡着了一般。火红的嫁衣衬着肌肤如雪。梳的纹丝不乱的头发上，一...
开封第一讲书人阅读 49,837评论 1赞 290
城市分裂传说
那天，我揣着相机与录音，去河边找鬼。笑死，一个胖子当着我的面吹牛，可吹牛的内容都是我干的。我是一名探鬼主播，决...
沈念sama阅读 38,987评论 3赞 408
双鸳鸯连环套：你想象不到人心有多黑
文/苍兰香墨我猛地睁开眼，长吁一口气：“原来是场噩梦啊……” “哼！你这毒妇竟也来了？” 一声冷哼从身侧响起，我...
开封第一讲书人阅读 37,730评论 0赞 267
万荣杀人案实录
序言：老挝万荣一对情侣失踪，失踪者是张志新（化名）和其女友刘颖，没想到半个月后，有当地人在树林里发现了一具尸体，经...
沈念sama阅读 44,194评论 1赞 303
护林员之死
正文独居荒郊野岭守林人离奇死亡，尸身上长有42处带血的脓包…… 初始之章·张勋以下内容为张勋视角年9月15日...
茶点故事阅读 36,525评论 2赞 327
白月光启示录
正文我和宋清朗相恋三年，在试婚纱的时候发现自己被绿了。大学时的朋友给我发了我未婚夫和他白月光在一起吃饭的照片。...
茶点故事阅读 38,664评论 1赞 340
活死人
序言：一个原本活蹦乱跳的男人离奇死亡，死状恐怖，灵堂内的尸体忽然破棺而出，到底是诈尸还是另有隐情，我是刑警宁泽，带...
沈念sama阅读 34,334评论 4赞 330
日本核电站爆炸内幕
正文年R本政府宣布，位于F岛的核电站，受9级特大地震影响，放射性物质发生泄漏。R本人自食恶果不足惜，却给世界环境...
茶点故事阅读 39,944评论 3赞 313
男人毒药：我在死后第九天来索命
文/蒙蒙一、第九天我趴在偏房一处隐蔽的房顶上张望。院中可真热闹，春花似锦、人声如沸。这庄子的主人今日做“春日...
开封第一讲书人阅读 30,764评论 0赞 21
一桩弑父案，背后竟有这般阴谋
文/苍兰香墨我抬头看了看天上的太阳。三九已至，却和暖如春，着一层夹袄步出监牢的瞬间，已是汗流浃背。一阵脚步声响...
开封第一讲书人阅读 31,997评论 1赞 266
情欲美人皮
我被黑心中介骗来泰国打工，没想到刚下飞机就差点儿被人妖公主榨干…… 1. 我叫王不留，地道东北人。一个月前我还...
沈念sama阅读 46,389评论 2赞 360
代替公主和亲
正文我出身青楼，却偏偏与公主长得像，于是被迫代替她去往敌国和亲。传闻我的和亲对象是个残疾皇子，可洞房花烛夜当晚...
茶点故事阅读 43,554评论 2赞 349

【笔记】数据库实例代码

课程二：

直接界面能改

界面添加信息

推荐阅读更多精彩内容