Database By Salman Mushtaq

Database in C# By Salman Mushtaq
Mitf12a006@pucit.edu.pk Page 1
Hello everyone , my name is Salman Mushtaq and I am student of IT in Punjab University , Pakistan.
I try my best to clear the concept .
In this Chapter we cover following:
- Database Connectivity
- Selection of data
- Insertion of data
- Insertion of data (parameterized query)
- Updation
- Deletion
- DataTable(In-Memory Databse)
- Dataset
- DataRelation
- DataAdapter
Ok let start from Database Connectivity.
DATABASE
Hum database “File” or “Console” k alternate main use kartay han .
Database say jab bhi data fetch karna hota hai hamain aik cost deni parti hai jo “File” k case main nai
deni parti but file is not efficient or protected way .
Jab bhi hum database say ko apne program main include karain gay hamain database create karni
pare gi . Main yahain Visual Stdio 2012 use kar raha hun aye daikhtay hain k yey sara kam kaise
huga.
STEPS
1- Open Visual Studio 2012

2- Create new project
3- Select Visual C# and Console Application and named it

After , this screen will appear
4- Now right click on name space that is on right side that is name of your application
Add => New Item => Data => Service based Database and named it with extension .mdf

5- Now this appear on main screen
6- Now create table in it and insert some data
Double click on database name in server explorer => right click on table => add new table =>
Fill table property and named it finally and some data by click on table name => show table data

Ok now create SqlConnection object and pass Path of database
You get path of your database by double click on your database its properties was shown here
you copy the ConnectionString .

In this chapter all students note that following:
Database Name : Student
Table Name : Stu(Id , Name , Mobile)
Now see the code and try to create understanding .
Remember out database name is Student.mdf and table name is Stu(Id,Name,Mobile).
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data.SqlClient;
namespace SalmanMushtaq
{
class Program
{
static void Main(string[] args)
{
string cs = @"Data
Source=(LocalDB)v11.0;AttachDbFilename=E:EADSalmanMushtaqSalmanMushtaqStudent.mdf;In
tegrated Security=True";
SqlConnection con = new SqlConnection(cs);
string query = "select * from Stu";
SqlCommand cmd = new SqlCommand(query, con);
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{

Console.Write("Id : " + dr["Id"]);
Console.Write("Name : " + dr["Name"]);
Console.WriteLine("Mobile No : " + dr["Mobile"]);
}
con.Close();
}
}
}
Output:
Ok selection is complete now
INSERTION
See code and understand
Database before insertion

Database after insertion:
Ok let we start the coding and then we show you the Output.
using System;
using System.Linq;
using System.Text;
{
class Program
{
{
string cs = @"Data
String n, m;
int i = 4; // We initialize Id as i=4 because we have three records already
// Afterwards you make your primary key AutoIncrement
Console.WriteLine("Enter Name");
n = Console.ReadLine();
Console.WriteLine("Enter Mobile Number");
m = Console.ReadLine();
string query = "Insert into Stu(Id,Name,Mobile) Values ('" + i + "','" + n +
"','" + m + "')";
con.Open();
int dr = cmd.ExecuteNonQuery();
if (dr > 0)

Console.WriteLine(dr + " row inserted successfully");
con.Close();
}
}
}
See the output:
Our database

Now there is 4 records …
Ok I hope you enjoy the database programming
Now we insert Record 5 with parameterized query:
Let see the code and understand:
using System;
using System.Linq;
using System.Text;
{
class Program
{
{
string cs = @"Data
String n, m;
int i = 5; // We initialize Id as i=5 because we have three records already
// Afterwards you make your primary key AutoIncrement

string query = "Insert into Stu(Id,Name,Mobile) values(@I , @N, @M)";
// Because we insert data through parameterized so we create SqlParameter
object
// and add it into Command
SqlParameter p1 = new SqlParameter("I",i);
SqlParameter p2 = new SqlParameter("N",n);
SqlParameter p3 = new SqlParameter("M",m);
// Add parameters
cmd.Parameters.Add(p1);
con.Open();
if (dr > 0)
Console.WriteLine(dr + " row inserted successfully");
con.Close();
}
}
}
Output:
Ok now see database

You see there are 5 records in a database:
Ok now Insertion is complete . Let we start Updation of data in C# (DataBase).
Update:
See code and understand:
Before updation:

Code: // We want to update the record 1
using System;
using System.Linq;
using System.Text;
{
class Program
{
{
string cs = @"Data
String m;
int i ;
Console.WriteLine("Enter Valid Id");
i = int.Parse(Console.ReadLine());
string query = "Update Stu set Mobile=@M where Id=@i";
SqlParameter p2 = new SqlParameter("M",m);

// Add parameters
con.Open();
if (dr > 0)
Console.WriteLine(dr + " row updated successfully");
else
Console.WriteLine("Invalid Id");
con.Close();
}
}
}
After Updation:

Ok updation is complete now we go to Deletion:
Delete:
We want to delete Record 5
Code:
using System;
using System.Linq;
using System.Text;
{
class Program
{
{
string cs = @"Data
String m;
int i ;
Console.WriteLine("Enter Valid Id");

string query = "Delete from Stu where Id=@i";
// Add parameters
con.Open();
if (dr > 0)
Console.WriteLine(dr + " row deleted successfully");
else
Console.WriteLine("Invalid Id");
con.Close();
}
}
}
Output:
Database:

Ok Students omeed hai app ab tak koi problem nai hui hu gi understanding main .
But if you have any problem contact me any time without any hesitation.
Salman Mushtaq
Mitf12a006@pucit.edu.pk
03337465571
FaceBook:
https://www.facebook.com/salman.mushtaq.39
Ok now we start next topic that is DataTable:
DataTable:
“When we want in-memory database than we use DataTabe , datatable contains some
properties like DataColumn , DataRow etc ” .
Ok let implement this concept.
Hum jab bhi database k sath connectivity kartay hain hamain kuch cost deni parti hai us cost se
bachnay k liye hum DataTable (In-Memory) concept use kartay han.
Code :
Steps;

1: Create DataTable object (Create Table), than columns , than rows than insert data , select data
, update data , delete data ……
using System;
using System.Linq;
using System.Text;
using System.Data;
{
class Program
{
{
DataTable Table1 = new DataTable("Table1");
// We have three columns as in Stu(Id,Name,Mobile)
DataColumn Id = new DataColumn("Id", typeof(int));
DataColumn Name = new DataColumn("Name", typeof(string));
DataColumn Mobile = new DataColumn("Mobile", typeof(string));
// Add these Columns in datatable
Table1.Columns.Add(Id);
Table1.Columns.Add(Name);
Table1.Columns.Add(Mobile);
// Every table must have primary key so now we make Id as primary key
Table1.PrimaryKey = new DataColumn[] { Id}; // We use array because may be
Primary key
// will be composite
// If we want to make primary key as auto Increamet than use this below code
that is in comments
// Id.AutoIncrement = true;
// Id.AutoIncrementSeed = 1; // kahain say start hu
// Id.AutoIncrementStep = 1; // Har bar kitney ka izafa hu
// we cannot make primary key as auto increament
// Add Data
DataRow r1 = Table1.NewRow(); // Make a new row in table
string n, m;
int i = 1;
Console.WriteLine("Enter Id");
Console.WriteLine("Enter Mobile");
// Now add row into table
r1["Id"] = i;

r1["Name"] = n;
r1["Mobile"] = m;
Table1.Rows.Add(r1);
//Select data
// We can select data though row index that is start from 0
// DataRow r = Table1.Rows[0];
// We can select data through primary key
// DataRow r = Table1.Rows.Find(PrimaryKey);
// We can select data through some criteria
// DataRow[] r = Table1.Select("Name like '%Fallen'");
// We can select data through some selection creteria
DataRow[] row = Table1.Select("Name like 'Salman%'");
foreach (DataRow r in row)
{
Console.WriteLine("Id is : " + r["Id"]);
Console.WriteLine("Name is : " + r["Name"]);
Console.WriteLine("Mobile is : " + r["Mobile"]);
}
}
}
}
Output:
Ok this is Insertion and Selection now Updation

Update DataTable:
using System;
using System.Linq;
using System.Text;
using System.Data;
{
class Program
{
{
Primary key
that is in comments
// Add Data
string n, m;
int i = 1;
r1["Id"] = i;
r1["Name"] = n;
r1["Mobile"] = m;

foreach (DataRow r in Table1.Rows)
{
}
int pk;
string mob;
pk = int.Parse(Console.ReadLine());
DataRow urow = Table1.Rows.Find(pk);
Console.WriteLine("Enter New Mobile number");
mob = Console.ReadLine();
urow["Mobile"] = mob;
Console.WriteLine("-------------");
Console.WriteLine("Update data");
{
}
}
}
}
Output:

Ok now we want to delete some data :
Delete DataTable:
using System;
using System.Linq;
using System.Text;
using System.Data;
{
class Program
{
{

Primary key
that is in comments
// Add Data
string n, m;
int i = 1;
r1["Id"] = i;
r1["Name"] = n;
r1["Mobile"] = m;
{
}
int pk;
pk = int.Parse(Console.ReadLine());
// Delete through index
//Table1.Rows.RemoveAt(0);
// Delete through primary key
DataRow drow = Table1.Rows.Find(pk);
Table1.Rows.Remove(drow);
Console.WriteLine("------------------");
{

}
}
}
}
Output :
You note that after --------------- line there is no data but there is code for print data this is because the
data will be deleted.
Ok Datable is complete
Now we move to our next topic that is DataRelation or Dataset but before doing this we do
DataAdapter.
DataAdapter:
Ok hamain pata hai k DataTable temporary hota hai jaise hi execution end hoti hai memory end hu jati
hai jo us ko RAM main allocate hui hoti hai lehaza DataTable tu in-memory table hai lehaza wo bhi
khatam hu jata hai , tu kiya ab hum har bar data insert karain gay aur phir koi calculation karain gay nai ,
hum aysa karain gay k in memory datatabe main data database say fill kar lain gay is ka faida yey hug a k
hamain database k sath connectivity sirf aik bar karni paray gi , aur baqi kam in memory tables say hu jae
ga ,
Is kam k liye hum DataAdapter use kartay hain .

DataAdapter k kuch methods hain
1. Fill
2. Update
Jab bhi data fill karna hug a hum fill ka method call karain gay with select query
Aur baqi tamam queries(update,delete,insert) k liye update ka function call karain gay.

Database By Salman Mushtaq

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