(15 Mins)A Simple C# And SQL Test

C# Basic Test

Replace string1 with string2 in all the files in a given folder including all the subfolders

The first way:

/********************************************************************************
 * Copyright (C) xxx. All rights reserved.
 * 
 * Author: xxx 
 * Email : xxx
 * Blog  : http://www.cnblogs.com/KnightsWarrior/
 * Create Date: 28/08/2012 18:40:24 PM
 * Description: Replace string1 with string2 in all the files in a given folder
 *              including all the subfolders
 *          
 * Revision History:
 *      Date                       Author               Description
 *     28/08/2012 19:01:24 PM      KnightsWarrior       
*********************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ReplaceStingInTxtFile
{
    class Program
    {
        static void Main(string[] args)
        {
            //string rootFolder = @"C:\TempFolder";
            //string string1 = "he is";
            //string string2 = "she is";
            Console.WriteLine("Please input the root folder:");
            string rootFolder = Console.ReadLine();
            Console.WriteLine("Please input the string you want to replace:");
            string string1 = Console.ReadLine();
            Console.WriteLine("Please input the string you want to replace with:");
            string string2 = Console.ReadLine();
            Console.WriteLine("Replacing started...");
            ReplaceString(rootFolder, string1, string2);
            Console.WriteLine("Replacing finished...");
            Console.ReadLine();
        }

        /// <summary>
        /// Replace string1 with string2 in all the files in a given folder including all the subfolders
        /// </summary>
        /// <param name="rootFolder">Root folder</param>
        /// <param name="string1">The string before replacing</param>
        /// <param name="string2">The string after replaced</param>
        private static void ReplaceString(string rootFolder, string string1, string string2)
        {
            DirectoryInfo d = new DirectoryInfo(rootFolder);
            FileInfo[] fis = d.GetFiles();
            foreach (var fi in fis)
            {
                if (IsTxtFile(fi.Name))
                {
                    try
                    {
                        string contents = File.ReadAllText(fi.FullName);
                        contents = contents.Replace(string1, string2);
                        File.SetAttributes(fi.FullName, FileAttributes.Normal);
                        File.WriteAllText(fi.FullName, contents);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                }
            }

            DirectoryInfo[] ds = d.GetDirectories();
            foreach (var info in ds)
            {
                ReplaceString(info.FullName, string1, string2);
            }
        }

        /// <summary>
        /// Check whether the file is txt file using fileName
        /// </summary>
        /// <param name="fileName">File Name</param>
        /// <returns></returns>
        private static bool IsTxtFile(string fileName)
        {
            if (fileName.IndexOf(".txt")>0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }

    }
}

The second way:

/********************************************************************************
 * Copyright (C) XXX. All rights reserved.
 * 
 * Author: XXX 
 * Email : XXX
 * Blog  : http://www.cnblogs.com/KnightsWarrior/
 * Create Date: 28/08/2012 19:01:24 PM
 * Description: Replace string1 with string2 in all the files in a given folder
 *              including all the subfolders
 *          
 * Revision History:
 *      Date                       Author               Description
 *     28/08/2012 19:09:24 PM      KnightsWarrior       
*********************************************************************************/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ReplaceStingInTxtFile
{
    class Program
    {
        static void Main(string[] args)
        {
            //string rootfolder = @"C:\TempFolder";
            //string string1 = "You are";
            //string string2 = "He is";
            Console.WriteLine("Please input the root folder:");
            string rootFolder = Console.ReadLine();
            Console.WriteLine("Please input the string you want to replace:");
            string string1 = Console.ReadLine();
            Console.WriteLine("Please input the string you want to replace with:");
            string string2 = Console.ReadLine();
            Console.WriteLine("Replacing started...");
            ReplaceString(rootFolder, string1, string2);
            Console.WriteLine("Replacing finished...");
            Console.ReadLine();
        }

        /// <summary>
        /// Replace string1 with string2 in all the files in a given folder including all the subfolders
        /// </summary>
        /// <param name="rootFolder">Root folder</param>
        /// <param name="string1">The string before replacing</param>
        /// <param name="string2">The string after replaced</param>
        public static void ReplaceString(string rootfolderName, string string1, string string2)
        {
            //Get all the txt files
            string[] files = Directory.GetFiles(rootfolderName, "*.txt", SearchOption.AllDirectories);
            foreach (string file in files)
            {
                try
                {
                    //Read the file into string
                    string contents = File.ReadAllText(file);
                    contents = contents.Replace(string1, string2);

                    //Set attributes and write the string into the file
                    File.SetAttributes(file, FileAttributes.Normal);
                    File.WriteAllText(file, contents);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }
        }
    }
}

The test folder as below:

DB Basic Test

/********************************************************************************
 * Copyright (C) XXX. All rights reserved.
 * 
 * Author: XXX 
 * Email : XXX
 * Blog  : http://www.cnblogs.com/KnightsWarrior/
 * Create Date: 28/08/2012 18:40:24 PM
 * Description: Create database and all the tables and insert simple data to these tables
 *          
 * Revision History:
 *      Date                       Author               Description
 *     28/08/2012 19:01:24 PM      KnightsWarrior       
*********************************************************************************/
--Create a database
CREATE DATABASE smu_db_test

GO

USE smu_db_test

GO

--Create all the tables
CREATE TABLE student
  (
     studentid   INT NOT NULL,
     studentname NVARCHAR (10),
     gender      CHAR(1),
     mobileno    NVARCHAR(13)
  )

GO

ALTER TABLE student
  ADD CONSTRAINT pk_studentid PRIMARY KEY (studentid)

GO

CREATE TABLE programme
  (
     programmeid   INT NOT NULL,
     programmename NVARCHAR(30)
  )

GO

ALTER TABLE programme
  ADD CONSTRAINT pk_programmeid PRIMARY KEY (programmeid)

GO

CREATE TABLE student_pro
  (
     studentid   INT NOT NULL,
     programmeid INT NOT NULL
  )

GO

ALTER TABLE student_pro
  ADD CONSTRAINT fk_studentid_student_pro FOREIGN KEY (studentid) REFERENCES
  student (studentid)

GO

ALTER TABLE student_pro
  ADD CONSTRAINT fk_programmeid_student_pro FOREIGN KEY (programmeid) REFERENCES
  programme (programmeid)

GO  

--Insert data into student table
INSERT INTO student (studentid, studentname, gender,mobileno) VALUES (1,  'Jason', 'M','12345678')
GO
INSERT INTO student (studentid, studentname, gender,mobileno) VALUES (2,  'Kitty', 'F','')
GO
INSERT INTO student (studentid, studentname, gender,mobileno) VALUES (3,  'Nance', 'M','')
GO
INSERT INTO student (studentid, studentname, gender,mobileno) VALUES (4,  'Harry', 'F','22334466')
GO

--Insert data into programme table
INSERT INTO programme (programmeid, programmename) VALUES (1,  'English')
GO
INSERT INTO programme (programmeid, programmename) VALUES (2,  'Chinese')
GO

--Insert data into student_pro table
INSERT INTO student_pro (studentid, programmeid) VALUES (1,  1)
GO
INSERT INTO student_pro (studentid, programmeid) VALUES (2,  2)
GO
INSERT INTO student_pro (studentid, programmeid) VALUES (3,  1)
GO
INSERT INTO student_pro (studentid, programmeid) VALUES (4,  2)
GO

The database and all the tables after processed the above SQL

The Query SQL:

SELECT A.programmeid,
       A.programmename,
      (SELECT COUNT(B.studentid)
       FROM student B
       INNER JOIN student_pro C ON B.studentid = C.studentid
       AND C.programmeid =A.programmeid) AS #ofStudents,
      (SELECT COUNT(B.studentid)
       FROM student B
       INNER JOIN student_pro C ON B.studentid = C.studentid
       AND C.programmeid =A.programmeid
       AND B.gender = 'M') AS #ofStudentsmale,
      (SELECT COUNT(B.studentid)
       FROM student B
       INNER JOIN student_pro C ON B.studentid = C.studentid
       AND C.programmeid =A.programmeid
       AND B.gender = 'F') AS #ofStudentsfemale,
      (SELECT COUNT(B.studentid)
       FROM student B
       INNER JOIN student_pro C ON B.studentid = C.studentid
       AND C.programmeid =A.programmeid
       AND B.mobileno <> '' AND B.mobileno IS NOT NULL) AS #ofStudentsmobile
FROM programme A
ORDER BY A.programmeid

The Results as below: