写student类中的select，delete，update，insert方法并在objectDataSource中应用（分别写两个，一个返回datatable，一个使用list）

select datatable:

public DataTable StudentSelect()

{

string sql = "select sid,sname,sex,age,photo from student";

return SqlHelper.ExecuteDataTable(sql);

}

list:

public int SID { get; set; }

public string SNAME { get; set; }

public string SEX { get; set; }

public int AGE { get; set; }

public string PHOTO { get; set; }

public List<Student> GetStudents()

{

string sql = "select sid,sname,sex,age,photo from student";

DataTable dt = SqlHelper.ExecuteDataTable(sql);

List<Student> list = new List<Student>();

foreach (DataRow row in dt.Rows)

{

Student stu=new Student();

stu.SID=(int)row[0];

stu.SNAME=row[1].ToString();

stu.SEX=row[2].ToString();

stu.AGE=Convert.ToInt32(row[3]);

stu.PHOTO=row[4].ToString();

list.Add(stu);

}

return list;

}

delete datatable:

public int StudentDelete(int sid)

{

string sql = "delete from student where sid=@sid";

SqlParameter pms = new SqlParameter("@sid", sid);

return SqlHelper.ExecuteNoQuery(sql, pms);

}

updata datatable:

public int StudentUpdate(int sid,string sname,string sex,int age,string photo)

{

string sql = "update student set
sname=@sname,sex=@sex,age=@age,photo=@photo where sid=@sid";

SqlParameter[] pms = new SqlParameter[]

{

new SqlParameter("@sname",sname),

new SqlParameter("@sex",sex),

new SqlParameter("@age",age),

new SqlParameter("@photo",photo),

new SqlParameter("@sid",sid)

};

return SqlHelper.ExecuteNoQuery(sql, pms);

}

insert datatable:

public int StudentInsert( string sname, string sex, int age, string photo)

{

string sql = "insert into student(sname,sex,age,photo) values(@sname,@sex,@age,@photo)";

SqlParameter[] pms = new SqlParameter[]

{

new SqlParameter("@sname",sname),

new SqlParameter("@sex",sex),

new SqlParameter("@age",age),

new SqlParameter("@photo",photo)

};

return SqlHelper.ExecuteNoQuery(sql, pms);

}