C#连接SQLserver数据库

导入命名空间

using System.Configuration;
using System.Data.SqlClient;
using System.Data;

类

• ConfigurationManager
• SqlDataReader
• SqlConnection
• SqlCommand

结构

• CommandBehavior

1.配置文件，在主窗体的App.config文件中添加以下Xml代码。

<connectionStrings>
      <add name="connString" connectionString="Data Source=PC-20210825AMUY\WOLL;Initial Catalog=TestData;User Id=sa;Password=87352092"/>
    connectionStrings>

完成后如下图

2.定义用于访问数据库的类–SQLHelper

• 定义SQLHelper类

//定义成静态类方便使用
 public static class SQLHelper
    {
                                         //ConfigurationManager需要引用System.configuration程序集
        private static string connString = ConfigurationManager.ConnectionStrings["connString"].ToString();
        //获取SQlReader
        public static SqlDataReader GetSqlReader(string sql)/*读取流*/
        {
            SqlConnection sqlConn = new SqlConnection(connString);
            SqlCommand sqlComm = new SqlCommand(sql, sqlConn);
            try
            {
                sqlConn.Open();
                return sqlComm.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }

3.定义利用SQLHelper获取需要的数据的类StudentServices，在此定义一个Student类作为例子

• 定义Student类

public class Student
    {
        public int sNo { get; set; }//编号
        public string Name { get; set; }//姓名
        public string Birthday { get; set; }//生日
        public string Gender { get; set; }//性别
        public string Phone { get; set; }//手机号
        public string Email { get; set; }//邮箱
        public string Address { get; set; }//地址
        public string StudentPic { get; set; }//学生地址
    }

• 定义StudentServices类

public static class StudentServices
    {
        //利用数据库访问通用类来获取数据表
        public static List<Student> GetStudentData()
        {
            List<Student> StudentList = new List<Student>();
            string sql = "select sNO, Name, Birthday, Gender, Phone, Email, Address, StudentPic from dbo.Students";
            try
            {
                SqlDataReader SQLReader = SQLHelper.GetSqlReader(sql);
                if (!SQLReader.HasRows) return null;
                else
                {
                    while (SQLReader.Read())
                    {
                        StudentList.Add(
                            new Student
                            {
                                sNo = Convert.ToInt32(SQLReader["sNo"]),
                                Name = SQLReader["Name"].ToString(),
                                Birthday = SQLReader["Birthday"].ToString(),
                                Gender = SQLReader["Gender"].ToString(),
                                Phone = SQLReader["Phone"].ToString(),
                                Email = SQLReader["Email"].ToString(),
                                Address = SQLReader["Address"].ToString(),
                                StudentPic = SQLReader["StudentPic"].ToString()
                            }
                        );
                    }
                }
                return StudentList;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
    }

4.使用

 class Program
    {
        static List<Student> stuList;
        static void Main(string[] args)
        {
            stuList=StudentServices.GetStudentData();
            for (int i = 0; i < stuList.Count; i++)
            {
                Console.WriteLine(stuList[i].Name);
            }
            Console.ReadKey();
        }
    }