/// <summary>
/// 判断教师用户是否存在。
/// </summary>
/// <param name="number">用户名</param>
/// <param name="password">密码</param>
/// <returns></returns>
public static bool teacherExits(string number, string password)
{
password = DAL_Safety.getMD5(password);
object obj = null;
try
{
string sql = "select username from teacher where username=?1 and password=?2;";
MySqlParameter[] para = new MySqlParameter[2];
para[0] = new MySqlParameter("?1", number);
para[1] = new MySqlParameter("?2", password);
obj = DAL_MysqlHelper.ExecuteScalar(sql, para);
}
catch (Exception e)
{
LogWriter.writeLine(@"C:\WEB_ASP\logs\DAL.log", "studentExits:" + e.Message);
return(false);
}
if (Equals(obj, null))
{
return(false);
}
else
{
return(true);
}
}
/// <summary>
/// 修改一个学生信息（包括密码、年龄、年纪、性别、专业）。
/// </summary>
/// <param name="student">修改后的学生信息</param>
/// <returns></returns>
public static bool modifyStudent(Student student)
{
string username = student.username;
string password = student.password;
if (password.Length != 0)
{
password = DAL_Safety.getMD5(password);
}
string age = student.age;
string grade = student.grade;
string sex = student.sex;
string major = student.major;
try
{
string sql = "";
int res = 0;
if (password.Length != 0)
{
sql = "update users set password=?1, grade=?2, age=?3, sex=?4, major=?5 where username=?6;";
MySqlParameter[] para = new MySqlParameter[6];
para[0] = new MySqlParameter("?1", password);
para[1] = new MySqlParameter("?2", grade);
para[2] = new MySqlParameter("?3", age);
para[3] = new MySqlParameter("?4", sex);
para[4] = new MySqlParameter("?5", major);
para[5] = new MySqlParameter("?6", username);
res = DAL_MysqlHelper.ExecuteNonQuery(sql, para);
}
else
{
sql = "update users set grade=?1, age=?2, sex=?3, major=?4 where username=?5;";
MySqlParameter[] para = new MySqlParameter[5];
para[0] = new MySqlParameter("?1", grade);
para[1] = new MySqlParameter("?2", age);
para[2] = new MySqlParameter("?3", sex);
para[3] = new MySqlParameter("?4", major);
para[4] = new MySqlParameter("?5", username);
res = DAL_MysqlHelper.ExecuteNonQuery(sql, para);
}
if (res > 0)
{
return(true);
}
else
{
return(false);
}
}
catch (Exception e)
{
LogWriter.writeLine("DAL.log", "modifyStudent:" + e.Message);
return(false);
}
}
/// <summary>
/// 修改教师信息。
/// </summary>
/// <param name="teacher">修改后的教师实体信息</param>
/// <returns></returns>
public static bool modifyTeacher(Teacher teacher)
{
string username = teacher.username;
string password = teacher.password;
if (password.Length != 0)
{
password = DAL_Safety.getMD5(password);
}
string age = teacher.age;
string sex = teacher.sex;
try
{
string sql = "";
int res = 0;
if (password.Length != 0)
{
sql = "update teacher set password=?1, age=?2, sex=?3 where username=?4;";
MySqlParameter[] para = new MySqlParameter[4];
para[0] = new MySqlParameter("?1", password);
para[1] = new MySqlParameter("?2", age);
para[2] = new MySqlParameter("?3", username);
para[3] = new MySqlParameter("?4", username);
res = DAL_MysqlHelper.ExecuteNonQuery(sql, para);
}
else
{
sql = "update teacher set age=?1, sex=?2 where username=?3;";
MySqlParameter[] para = new MySqlParameter[3];
para[0] = new MySqlParameter("?1", age);
para[1] = new MySqlParameter("?2", sex);
para[2] = new MySqlParameter("?3", username);
res = DAL_MysqlHelper.ExecuteNonQuery(sql, para);
}
if (res > 0)
{
return(true);
}
else
{
return(false);
}
}
catch (Exception e)
{
LogWriter.writeLine("DAL.log", "modifyTeacher:" + e.Message);
return(false);
}
}
