.NET中SQLServer数据库的安装和入门使用

安装数据库

里安装64位的SQL Server 2008 R2，

下载地址

http://www.microsoft.com/en-us/download/details.aspx?id=23650

双击exe，选择“全新安装”

 

然后安装所有功能

 命名实例：doesthismatter，

实例id ：legion，实例文件目录C:sqlserverfiles，

设置混合模式密码：123456

。登录使用，服务器名称localhostdoesthismatter

登录名：sa，密码123456

 

附加数据库

此时登录的时候需要以windows身份验证，否则会拒绝访问。

右键数据库文件夹，点击附加

 新窗口中点击“添加”按钮，浏览到build.mdf文件。

入门 使用

现在数据表login_user中有三行数据，我们将其读入到一个comboBox中。

 C# 数据库框架类

   public class Database
    {
       public SqlConnection getConnection()
       {
           return new SqlConnection(@"server=localhostdoesthismatter;uid=sa;pwd=123456;database=build");
       }
       SqlConnection con = null;
       /// <summary>
       /// 执行SQL语句
       /// </summary>
       /// <param name="sql">SQL语句</param>
       /// <returns>返回一个具体值</returns>
       public object QueryScalar(string sql)
       {
           Open();//打开数据连接
           object result = null;
           try
           {
               using(SqlCommand cmd=new SqlCommand(sql,con))
               {
                   result = cmd.ExecuteScalar();
                   return result;
               }
           }
           catch
           {
               return null;
           }

       }
       /// <summary>
       /// 执行SQL语句
       /// </summary>
       /// <param name="sql">要执行的SQL语句</param>
       /// <param name="prams">参数</param>
       /// <returns></returns>
       public object QueryScalar(string sql,SqlParameter[]prams)
       {
           Open();
           object result = null;
           try
           {
               using (SqlCommand cmd = CreateCommandSql(sql, prams))
               {
                   result = cmd.ExecuteScalar();
                   return result;
               }
           }
           catch
           {
               return null;
           }
       }
       /// <summary>
       /// 创建一个Sqlcommand对象，用来构建SQL语句
       /// </summary>
       /// <param name="sql">sql语句</param>
       /// <param name="prams">sql所需要的参数</param>
       /// <returns></returns>
       public SqlCommand CreateCommandSql(string sql, SqlParameter[] prams)
       {
           Open();
           SqlCommand cmd = new SqlCommand(sql,con);
           if (prams != null)
           {
               foreach (SqlParameter parameter in prams)
               {
                   cmd.Parameters.Add(parameter);
               }
           }
           return cmd;
       }
       private void Open()
       {
           if (con == null)
           {
               //con = new SqlConnection("server=.;uid=home;pwd=;database=build");
               con=new SqlConnection(@"server=localhostdoesthismatter;uid=sa;pwd=123456;database=build");


           }
           if (con.State == ConnectionState.Closed)
           {
               con.Open();
           }
       }
       /// <summary>
       /// 要执行SQL语句，该方法返回一个DataTable
       /// </summary>
       /// <param name="sql">执行SQL语句</param>
       /// <returns></returns>
       public DataTable Query(string sql)
       {
           Open();
           using (SqlDataAdapter sqlda = new SqlDataAdapter(sql, con))
           {
               using (DataTable dt = new DataTable())
               {
                   sqlda.Fill(dt);
                   return dt;
               }
           }

       }
       /// <summary>
       /// 执行SQL语句，返回DataTable
       /// </summary>
       /// <param name="sql">要执行的SQL语句</param>
       /// <param name="prams">构建SQL语句所需要的参数</param>
       /// <returns></returns>
       public DataTable Query(string sql,SqlParameter[]prams)
       {
           SqlCommand cmd = CreateCommandSql(sql,prams);
           using (SqlDataAdapter sqldata = new SqlDataAdapter(cmd))
           {
               using (DataTable dt = new DataTable())
               {
                   sqldata.Fill(dt);
                   return dt;
               }
           }
       }
       /// <summary>
       /// 执行SQL语句，返回影响的记录行数
       /// </summary>
       /// <param name="sql">要执行的SQL语句</param>
       /// <returns></returns>
       public int RunSql(string sql)
       {
           int result = -1;
           try
           {
               Open();
               using (SqlCommand cmd = new SqlCommand(sql, con))
               {
                  result= cmd.ExecuteNonQuery();
                  con.Close();
                  return result;
               }
           }
           catch
           {
               return 0;
           }
       }
       /// <summary>
       /// 执行SQL语句，返回影响的记录行数
       /// </summary>
       /// <param name="sql">要执行的SQL语句</param>
       /// <param name="prams">SQL语句所需要的参数</param>
       /// <returns></returns>
       public int RunSql(string sql,SqlParameter[]prams)
       {
           try
           {
               int result = -1;
               SqlCommand cmd = CreateCommandSql(sql, prams);
               result = cmd.ExecuteNonQuery();
               this.Close();
               return result;
           }
           catch
           {
               return 0;
           }

       }
       public void Close()
       {
           if (con != null)
               con.Close();

       }
}

 窗口初始化的加载代码

private void login_Load(object sender, EventArgs e)
        {
            this.skinEngine1.SkinFile = "DiamondBlue.ssk";
            try
            {
                string sql = "select * from login_user";
                DataTable dd = data.Query(sql);
                this.comboBox1.DataSource = dd;
                this.comboBox1.DisplayMember = "_name";



            }
            catch
            {

            }
            finally
            {
                data.Close();
            }
        }

 效果