coursedb.cs

学生学籍管理

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;

using SchoolMIS.DataAccess.Common.Entity;

namespace SchoolMIS.DataAccess.Teacher.SQLServer
{
    public class CourseDB
    {
        /// <summary>
        /// 添加课程信息
        /// </summary>
        /// <param name="course">课程信息实体</param>
        /// <returns>添加成功 true</returns>
        public bool AddCourse(ECourse course)
        {
            //建立数据库连接对象
            SqlConnection conn = new SqlConnection(Constants.ConnString);
            //建立数据库命令对象
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = Constants.AddCourse;
            cmd.CommandType = CommandType.Text;
            SqlParameter paramCourseName = new SqlParameter("@courseName", course.CourseName);
            cmd.Parameters.Add(paramCourseName);
            SqlParameter paramCourseTime = new SqlParameter("@courseTime", course.CourseTime);
            cmd.Parameters.Add(paramCourseTime);
            SqlParameter paramCourseStartTime = new SqlParameter("@courseStartTime", course.CourseStartTime);
            cmd.Parameters.Add(paramCourseStartTime);
            SqlParameter paramCourseEndTime = new SqlParameter("@courseEndTime", course.CourseEndTime);
            cmd.Parameters.Add(paramCourseEndTime);
            SqlParameter paramCourseCredit = new SqlParameter("@courseCredit", course.CourseCredit);
            cmd.Parameters.Add(paramCourseCredit);
            SqlParameter paramCourseTeacher = new SqlParameter("@courseTeacher", course.CourseTeacher);
            cmd.Parameters.Add(paramCourseTeacher);
            SqlParameter paramCourseDesc = new SqlParameter("@courseDesc", course.CourseDesc);
            cmd.Parameters.Add(paramCourseDesc);
            SqlParameter paramCourseAddress = new SqlParameter("@courseAddress", course.CourseAddress);
            cmd.Parameters.Add(paramCourseAddress);

            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
                conn.Close();

                return true;
            }
            catch (SqlException ex)
            {
                return false;
            }
            finally
            {
                //确保数据库连接被关闭
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
        }

        /// <summary>
        /// 依据教师姓名获取所有课程信息
        /// </summary>
        /// <param name="teaName">教师姓名</param>
        /// <returns>课程信息</returns>
        public DataSet GetAllCourse(string teaName)
        {
            //建立数据库连接对象
            SqlConnection conn = new SqlConnection(Constants.ConnString);
            //建立数据库命令对象
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = Constants.GetAllCourseByTeaName;
            cmd.CommandType = CommandType.Text;

            SqlDataAdapter dataAdapter = new SqlDataAdapter();
            dataAdapter.SelectCommand = cmd;
            SqlParameter paramTeaName = new SqlParameter("@teaName", teaName);
            cmd.Parameters.Add(paramTeaName);

            DataSet allCourse = new DataSet();

            try
            {
                dataAdapter.Fill(allCourse, "course");
                return allCourse;
            }
            catch (SqlException ex)
            {
                return null;
            }
            finally
            {
                //确保数据库连接被关闭
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
        }

        /// <summary>
        /// 依据课程编号删除课程具体信息
        /// </summary>
        /// <param name="courseID">课程编号</param>
        /// <returns>删除成功 true</returns>
        public bool DeleteCourseByID(int courseID)
        {
            if (!this.DeleteStuCourseByID(courseID))
            {
                return false;
            }
            else
            {
                //建立数据库连接对象
                SqlConnection conn = new SqlConnection(Constants.ConnString);
                //建立数据库命令对象
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = Constants.DeleteCourseByCourseID;
                cmd.CommandType = CommandType.Text;
                SqlParameter paramCourseID = new SqlParameter("@courseID", courseID);
                cmd.Parameters.Add(paramCourseID);

                try
                {
                    conn.Open();
                    cmd.ExecuteNonQuery();
                    conn.Close();

                    return true;
                }
                catch (SqlException ex)
                {
                    return false;
                }
                finally
                {
                    //确保数据库连接被关闭
                    if (conn.State == ConnectionState.Open)
                    {
                        conn.Close();
                    }
                }
            }
        }

        /// <summary>
        /// 依据课程编号删除学生选课信息
        /// </summary>
        /// <param name="courseID">课程标号</param>
        /// <returns>删除成功 true</returns>
        public bool DeleteStuCourseByID(int courseID)
        {
            //建立数据库连接对象
            SqlConnection conn = new SqlConnection(Constants.ConnString);
            //建立数据库命令对象
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = Constants.DeleteCourseByCourseID;
            cmd.CommandType = CommandType.Text;
            SqlParameter paramCourseID = new SqlParameter("@courseID", courseID);
            cmd.Parameters.Add(paramCourseID);

            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
                conn.Close();

                return true;
            }
            catch (SqlException ex)
            {
                return false;
            }
            finally
            {
                //确保数据库连接被关闭
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
        }

        /// <summary>
        /// 依据课程号获取所有选课学生的信息
        /// </summary>
        /// <param name="courseID">课程号</param>
        /// <returns>所有选课的学生信息</returns>
        public DataSet GetAllStudentByCourseID(int courseID)
        {
            //建立数据库连接对象
            SqlConnection conn = new SqlConnection(Constants.ConnString);
            //建立数据库命令对象
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = Constants.GetStuCourseByCourseID;
            cmd.CommandType = CommandType.Text;

            SqlDataAdapter dataAdapter = new SqlDataAdapter();
            dataAdapter.SelectCommand = cmd;
            SqlParameter paramCourseID = new SqlParameter("@courseID", courseID);
            cmd.Parameters.Add(paramCourseID);

            DataSet allStudent = new DataSet();

            try
            {
                dataAdapter.Fill(allStudent, "student");
                return allStudent;
            }
            catch (SqlException ex)
            {
                return null;
            }
            finally
            {
                //确保数据库连接被关闭
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
        }

        public bool UpdateScore(int scID, int score)
        {
            //建立数据库连接对象
            SqlConnection conn = new SqlConnection(Constants.ConnString);
            //建立数据库命令对象
            SqlCommand cmd = new SqlCommand();
            cmd.Connection = conn;
            cmd.CommandText = Constants.UpdateScore;
            cmd.CommandType = CommandType.Text;
            SqlParameter paramScore = new SqlParameter("@score", score);
            cmd.Parameters.Add(paramScore);
            SqlParameter paramScID = new SqlParameter("@scID", scID);
            cmd.Parameters.Add(paramScID);

            try
            {
                conn.Open();
                cmd.ExecuteNonQuery();
                conn.Close();

                return true;
            }
            catch (SqlException ex)
            {
                return false;
            }
            finally
            {
                //确保数据库连接被关闭
                if (conn.State == ConnectionState.Open)
                {
                    conn.Close();
                }
            }
        }
    }
}