通过动态创建表来实现成绩存放

经过一番思量，感觉成绩存放采用动态创建表更合理。本来想着通过查询DB中现有表名来确定某专业成绩是否存在，后来决定重新建一个只有一个字段（专业名）的表来记录已经有哪些专业的成绩表存在。


using System;


using System.Data;


using System.Data.OleDb;


using System.Configuration;


using System.Web;


using System.Web.Security;


using System.Web.UI;


using System.Web.UI.WebControls;


using System.Web.UI.WebControls.WebParts;


using System.Web.UI.HtmlControls;






/**//// <summary>


/// Summary description for DbOperation


/// </summary>


public class DbOperation




...{


    string Department;


    double StuID;


    string Course;


    double Score;




    public static string connString = ConfigurationManager.AppSettings["provider"].ToString()


            + HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings["dbPath"])


            + ";";




public DbOperation()




...{


}




    public DbOperation(string department,double stuID,string course,double score)




    ...{


        Department = department;


        StuID = stuID;


        Course = course;


        Score = score;


    }




  


    public void InsertGradeOfDepartment()




    ...{


        OleDbConnection Conn = new OleDbConnection(connString);


        string sql = "select * from GradeAmount where Department='"+Department+"'";


        Conn.Open();


        OleDbCommand Cmd = new OleDbCommand(sql, Conn);


        OleDbDataReader dr = Cmd.ExecuteReader();


        if (dr.Read())




        ...{


            Conn.Close();


            InsertGrade();




        }


        else




        ...{


            Conn.Close();


            CreatGradeTable();


            InsertStu2GradeTable();


            SignDepartment();


            InsertGrade();


        }


    }




    private void CreatGradeTable()




    ...{


        string CreatSql = "Create table " + Department


                        + " (StuID Number, StuName Text)";


        string GetCourseSql = "select CourseName from Course where Department='" 


                        + Department + "'";




        OleDbConnection CreatConn = new OleDbConnection(connString);




        try




        ...{


            CreatConn.Open();


            OleDbCommand CreatCmd = new OleDbCommand(CreatSql, CreatConn);


            CreatCmd.ExecuteNonQuery();


            OleDbDataAdapter da = new OleDbDataAdapter(GetCourseSql, CreatConn);


            DataSet ds = new DataSet();


            da.Fill(ds, "Course");




            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)




            ...{


                string temp = ds.Tables[0].Rows[i][0].ToString();


                temp = temp.Replace('.', '_');


                string AlterSql = "alter table " + Department + " add [" + temp + "] Number;";


                OleDbCommand AlterCmd = new OleDbCommand(AlterSql, CreatConn);


                AlterCmd.ExecuteNonQuery();


            }


        }


        catch




        ...{


        }


        finally




        ...{


            CreatConn.Close();


        }


    }




       private void InsertStu2GradeTable()




    ...{


        OleDbConnection Conn = new OleDbConnection(connString);


        Conn.Open();


        string GetStuSql = "select StuID,StuName from StuInfo where Department='"+Department+"'";


        OleDbDataAdapter da = new OleDbDataAdapter(GetStuSql, Conn);


        DataSet ds = new DataSet();


        da.Fill(ds, "Stu");


        for (int i=0; i < ds.Tables[0].Rows.Count; i++)




        ...{


            double stuId =(double) ds.Tables[0].Rows[i][0];


            string stuName = ds.Tables[0].Rows[i][1].ToString();


            string InsertSql = "Insert Into " + Department + " (StuID,StuName) Values("+stuId+",'"+stuName+"')";


            OleDbCommand InsCmd = new OleDbCommand(InsertSql, Conn);


            InsCmd.ExecuteNonQuery();


        }


        Conn.Close();


    }




    private void SignDepartment()




    ...{


        OleDbConnection Conn = new OleDbConnection(connString);


        Conn.Open();


        string sql = "Insert into GradeAmount (Department) Values('"+Department+"')";


        OleDbCommand Cmd = new OleDbCommand(sql, Conn);


        Cmd.ExecuteNonQuery();


        Conn.Close();


    }




 private void InsertGrade()




    ...{


        string InsertSql = "update "+Department+" set "+Course+"="+Score+" where StuID="+StuID;


        OleDbConnection Conn = new OleDbConnection(connString);


        try




        ...{


            Conn.Open();


            OleDbCommand InsertCmd = new OleDbCommand(InsertSql, Conn);


            InsertCmd.ExecuteNonQuery();


        }


        catch




        ...{


        }


        finally




        ...{


            Conn.Close();


        }


    }




}



//虽然这将导致很多代码重写，但是感觉无论是为了学习还是仅仅为了毕业设计都是值得的。