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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
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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();
- }
- }
- }
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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();
- }
- }
- }
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