VS2010连接SQL Server 2008并执行查询操作

VS2010连接SQL Server 2008并执行查询操作

作者：Cambridgeacm

VS2010连接SQL Server 2008并执行查询操作

先在SQL Server 2008中建一个Student数据库，含有一个表student，4个字段，分别为姓名(varchar)学号(varchar)性别(varchar)年龄(int)，并指定一个用户登录该数据库，用户名为cam，密码为123456，注意要修改cam用户的权限



新建控制台应用程序，连接数据库，输出student表中的所有字段，并执行插入删除操作

using System;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace 连接数据库
{
class Program
{
public static int Insert(string name, string pwd,string sex,int age)
{
SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=Student;Integrated Security=True");//Initial Catalog后面跟你数据库的名字
conn.Open();
string sql = "insert into student(姓名,学号,性别,年龄) values(@name,@pwd,@sex,@age)";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlParameter parn1 = new SqlParameter("@name", name);
cmd.Parameters.Add(parn1);
SqlParameter parn2 = new SqlParameter("@pwd", pwd);
cmd.Parameters.Add(parn2);
SqlParameter parn3 = new SqlParameter("@sex", sex);
cmd.Parameters.Add(parn3);
SqlParameter parn4 = new SqlParameter("@age", age);
cmd.Parameters.Add(parn4);
int result = cmd.ExecuteNonQuery();//result接收受影响行数，也就是说result大于0的话表示添加成功
conn.Close();
cmd.Dispose();
return result;
}
public static int Update(string name)
{
SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=Student;Integrated Security=True");//Initial Catalog后面跟你数据库的名字
conn.Open();
string sql = "delete from student where 姓名=@name";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlParameter parn = new SqlParameter("@name",name);
cmd.Parameters.Add(parn);
int result = cmd.ExecuteNonQuery();//result接收受影响行数，也就是说result大于0的话表示删除成功
conn.Close();
cmd.Dispose();
return result;
}
static void Main(string[] args)
{
//指定Sql Server提供者的连接字符串
string connString = "server=CAMBRIDGE-PC;database =Student;uid=cam;pwd=123456";
//建立连接对象
SqlConnection Sqlconn = new SqlConnection(connString);
//打开连接
Sqlconn.Open();
//为上面的连接指定Command对象
SqlCommand thiscommand = Sqlconn.CreateCommand();
thiscommand.CommandText = "select 姓名,学号,性别,年龄 from student";
//为指定的command对象执行DataReader
SqlDataReader thisSqlDataReader = thiscommand.ExecuteReader();
while (thisSqlDataReader.Read())
{
Console.WriteLine("{0} {1} {2} {3}", thisSqlDataReader["姓名"], thisSqlDataReader["学号"], thisSqlDataReader["性别"], thisSqlDataReader["年龄"]);
}
//关闭读取
thisSqlDataReader.Close();
int result = Insert("关羽", "E01014307", "男", 25);
Console.WriteLine("影响的行数为:{0}", result);
result = Update("关羽");
Console.WriteLine("影响的行数为:{0}", result);
//关闭连接
Sqlconn.Close();
Console.ReadLine();
}
}
}

建Windows窗体应用程序也可以,在Form窗体中拖一个DataGridView控件，插入一个学生的信息，在DataGridView控件中显示所有学生的信息

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace cam
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public static int Insert(string name, string pwd, string sex, int age)
{
SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=Student;Integrated Security=True");//Initial Catalog后面跟你数据库的名字
conn.Open();
string sql = "insert into student(姓名,学号,性别,年龄) values(@name,@pwd,@sex,@age)";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlParameter parn1 = new SqlParameter("@name", name);
cmd.Parameters.Add(parn1);
SqlParameter parn2 = new SqlParameter("@pwd", pwd);
cmd.Parameters.Add(parn2);
SqlParameter parn3 = new SqlParameter("@sex", sex);
cmd.Parameters.Add(parn3);
SqlParameter parn4 = new SqlParameter("@age", age);
cmd.Parameters.Add(parn4);
int result = cmd.ExecuteNonQuery();//result接收受影响行数，也就是说result大于0的话表示添加成功
conn.Close();
cmd.Dispose();
return result;
}
public static int Update(string name)
{
SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=Student;Integrated Security=True");//Initial Catalog后面跟你数据库的名字
conn.Open();
string sql = "delete from student where 姓名=@name";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlParameter parn = new SqlParameter("@name", name);
cmd.Parameters.Add(parn);
int result = cmd.ExecuteNonQuery();//result接收受影响行数，也就是说result大于0的话表示删除成功
conn.Close();
cmd.Dispose();
return result;
}
public DataTable sel()
{
SqlConnection conn = new SqlConnection("Data Source=(local);Initial Catalog=Student;Integrated Security=True");//Initial Catalog后面跟你数据库的名字,如果你的SqlServer服务器名称后面不带SQLEXPRESS，那么Data Source=.
conn.Open();
string sql = "select * from student";
SqlCommand cmd = new SqlCommand(sql, conn);
SqlDataAdapter sda = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
sda.Fill(dt);
conn.Close();
cmd.Dispose();
return dt;
}
private void Form1_Load(object sender, EventArgs e)
{
Insert("关羽", "E01014307", "男", 25);
dataGridView1.DataSource = sel();
}
}
}