【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

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

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

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
);

``*
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
);

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)
{

}
}
}

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