Author: coder

Bind two DataGrids with many to many mapping

Posted on by coder 
   

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

    public class Form1 : System.Windows.Forms.Form{
      private System.Windows.Forms.DataGrid dataGrid1;
      private System.Data.DataSet dataSet1;
      private System.ComponentModel.Container components = null;

      public Form1() {
        InitializeComponent();
      }
      private void InitializeComponent(){
        this.dataGrid1 = new System.Windows.Forms.DataGrid();
        this.dataSet1 = new System.Data.DataSet();
        ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
        ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();
        this.SuspendLayout();

        this.dataGrid1.DataMember = "";
        this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
        this.dataGrid1.Location = new System.Drawing.Point(0, 0);
        this.dataGrid1.Name = "dataGrid1";
        this.dataGrid1.Size = new System.Drawing.Size(400, 200);
        this.dataGrid1.TabIndex = 0;

        this.dataSet1.DataSetName = "NewDataSet";
        this.dataSet1.Locale = new System.Globalization.CultureInfo("en-US");

        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(400, 196);
        this.Controls.Add(this.dataGrid1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.Load += new System.EventHandler(this.Form1_Load);
        ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
        ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();
        this.ResumeLayout(false);
      }
      [STAThread]
      static void Main() {
        Application.Run(new Form1());
      }

      private void Form1_Load(object sender, System.EventArgs e) {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
         string qry1 = @"select * from employee ";
         string qry2 = @"select * from order";

         string sql = qry1 + qry2;

         SqlConnection conn = new SqlConnection(connString);
         SqlDataAdapter da = new SqlDataAdapter(sql, conn);
    
         da.TableMappings.Add("Table", "employee");
         da.TableMappings.Add("Table1", "order");
         da.Fill(dataSet1);

         DataRelation dr = new DataRelation(
            "employeeorders",
            dataSet1.Tables[0].Columns["employeeid"], 
            dataSet1.Tables[1].Columns["employeeid"]
            );
         dataSet1.Relations.Add(dr);

         dataGrid1.SetDataBinding(dataSet1, "employees");

      }
    }

DataGrid Update: edit a table by binding component

Posted on by coder 
   

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

    public class Form1 : System.Windows.Forms.Form {
      private System.Windows.Forms.DataGrid dataGrid1;
      private System.Windows.Forms.Button buttonUpdate;
      private System.Data.DataSet dataSet1;
      private System.Data.SqlClient.SqlCommand sqlCommand1;
      private System.ComponentModel.Container components = null;

      private SqlCommandBuilder cb;
      private SqlDataAdapter da;

      public Form1() {
         InitializeComponent();
      }
      private void InitializeComponent(){
         this.dataGrid1 = new System.Windows.Forms.DataGrid();
         this.buttonUpdate = new System.Windows.Forms.Button();
         this.dataSet1 = new System.Data.DataSet();
         this.sqlCommand1 = new System.Data.SqlClient.SqlCommand();
         ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
         ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).BeginInit();
         this.SuspendLayout();

         this.dataGrid1.DataMember = "";
         this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
         this.dataGrid1.Location = new System.Drawing.Point(8, 8);
         this.dataGrid1.Name = "dataGrid1";
         this.dataGrid1.Size = new System.Drawing.Size(440, 208);
         this.dataGrid1.TabIndex = 0;

         this.buttonUpdate.Location = new System.Drawing.Point(191, 232);
         this.buttonUpdate.Name = "buttonUpdate";
         this.buttonUpdate.TabIndex = 1;
         this.buttonUpdate.Text = "Update";
         this.buttonUpdate.Click += new System.EventHandler(this.buttonUpdate_Click);

         this.dataSet1.DataSetName = "NewDataSet";
         this.dataSet1.Locale = new System.Globalization.CultureInfo("en-US");

         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(456, 272);
         this.Controls.Add(this.buttonUpdate);
         this.Controls.Add(this.dataGrid1);
         this.Name = "Form1";
         this.Text = "Form1";
         this.Load += new System.EventHandler(this.Form1_Load);
         ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
         ((System.ComponentModel.ISupportInitialize)(this.dataSet1)).EndInit();
         this.ResumeLayout(false);

      }
      static void Main() {
         Application.Run(new Form1());
      }

      private void Form1_Load(object sender, System.EventArgs e){
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
         string sql = @"select * from employee ";
         SqlConnection conn = new SqlConnection(connString);
         sqlCommand1 = new SqlCommand(sql, conn);

         da = new SqlDataAdapter();
         da.SelectCommand = sqlCommand1;

         cb = new SqlCommandBuilder(da);

         da.Fill(dataSet1, "employee");

         dataGrid1.SetDataBinding(dataSet1, "employee");
      }

      private void buttonUpdate_Click(object sender, System.EventArgs e) {
         da.Update(dataSet1, "employee"); 
      }
    }

Bind DataSet to DataGrid

Posted on by coder 
   

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.DataGrid dataGrid1;
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            InitializeComponent();
        }

        private void InitializeComponent(){
         this.dataGrid1 = new System.Windows.Forms.DataGrid();
         ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
         this.SuspendLayout();
         this.dataGrid1.DataMember = "";
         this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
         this.dataGrid1.Location = new System.Drawing.Point(8, 8);
         this.dataGrid1.Name = "dataGrid1";
         this.dataGrid1.Size = new System.Drawing.Size(608, 256);
         this.dataGrid1.TabIndex = 0;
         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(624, 272);
         this.Controls.Add(this.dataGrid1);
         this.Name = "Form1";
         this.Text = "Form1";
         this.Load += new System.EventHandler(this.Form1_Load);
         ((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
         this.ResumeLayout(false);

      }

      static void Main() {
            Application.Run(new Form1());
      }

      private void Form1_Load(object sender, System.EventArgs e){
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";

         string sql = @"select * from employee";

         SqlConnection conn = new SqlConnection(connString);
         SqlDataAdapter da = new SqlDataAdapter(sql, conn);
         DataSet ds = new DataSet();
         da.Fill(ds, "customers");

         // Bind the data table to the data grid
         dataGrid1.SetDataBinding(ds, "customers");
      }
    }

Read comma separated value into DataSet

Posted on by coder

using System;
using System.Data;
using System.IO;

class Class1{
static void Main(string[] args){
DataSet myDataSet = GetData();
foreach (DataColumn c in myDataSet.Tables[“TheData”].Columns){
Console.Write(“{0,-20}”,c.ColumnName);
}
Console.WriteLine();

foreach (DataRow r in myDataSet.Tables[“TheData”].Rows)
{
foreach (DataColumn c in myDataSet.Tables[“TheData”].Columns)
{
Console.Write(“{0,-20}”,r);
}
Console.WriteLine();
}
}

private static DataSet GetData(){
string strLine;
string[] strArray;
char[] charArray = new char[] {','};
DataSet ds = new DataSet();
DataTable dt = ds.Tables.Add(“TheData”);
FileStream aFile = new FileStream(“csv.txt”,FileMode.Open);
StreamReader sr = new StreamReader(aFile);

strLine = sr.ReadLine();

strArray = strLine.Split(charArray);

for(int x=0;x<=strArray.GetUpperBound(0);x++) { dt.Columns.Add(strArray[x].Trim()); } strLine = sr.ReadLine(); while(strLine != null) { strArray = strLine.Split(charArray); DataRow dr = dt.NewRow(); for(int i=0;i<=strArray.GetUpperBound(0);i++) { dr[i] = strArray[i].Trim(); } dt.Rows.Add(dr); strLine = sr.ReadLine(); } sr.Close(); return ds; } } // File: csv.txt /* 1,2,3,4 5,6,7,8 */ [/csharp]

This example will read a csv file into a dataset and save it back when you press button 1

Posted on by coder

//This example code is from eran.rivlis at gmail.com

DataTable dt = new DataTable();

private void Form1_Load(object sender, EventArgs e)
{
string conString = @”Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:csv” +
@”;Extended Properties=””Text;HDR=No;FMT=Delimited”””;
OleDbConnection conn = new OleDbConnection(conString);
OleDbDataAdapter da = new OleDbDataAdapter(@”Select * from table1.csv”, conn);
da.Fill(dt);
dataGridView1.DataSource = dt;
}

private void button1_Click(object sender, EventArgs e)
{
StringBuilder sbCSV = new StringBuilder();
int intColCount = dt.Columns.Count;
foreach (DataRowView dr in dt.DefaultView)
{
for (int x = 0; x < intColCount; x++) { sbCSV.Append(dr[x].ToString()); if ((x + 1) != intColCount) { sbCSV.Append(","); } } sbCSV.Append(" "); } using (StreamWriter sw = new StreamWriter(@"c:csv able1.csv")) { sw.Write(sbCSV.ToString()); } } [/csharp]

Create table through SqlConnection

Posted on by coder 
   

using System;
using System.Data;
using System.Data.SqlClient;

   class CommandExampleCreateDb
   {
      static void Main() 
      {
         SqlConnection thisConnection = new SqlConnection("server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI");
         SqlCommand nonqueryCommand = thisConnection.CreateCommand();

         try 
         {
            thisConnection.Open();

            nonqueryCommand.CommandText = "CREATE DATABASE MyDb";
            Console.WriteLine(nonqueryCommand.CommandText);

            nonqueryCommand.ExecuteNonQuery();
            Console.WriteLine("Database created, now switching");
            thisConnection.ChangeDatabase("MyDb");

            nonqueryCommand.CommandText = "CREATE TABLE MyJava2sTable (COL1 integer)";
            Console.WriteLine(nonqueryCommand.CommandText);
            Console.WriteLine("Number of Rows Affected is: {0}", nonqueryCommand.ExecuteNonQuery());

            nonqueryCommand.CommandText = "INSERT INTO MyJava2sTable VALUES (99)";
            Console.WriteLine(nonqueryCommand.CommandText);
            Console.WriteLine("Number of Rows Affected is: {0}", nonqueryCommand.ExecuteNonQuery());
         
         } catch (SqlException ex) {
         
            Console.WriteLine(ex.ToString());
         
         } finally {  
         
            thisConnection.Close();
            Console.WriteLine("Connection Closed.");
         
         }
      }
   }

Use ExecuteNonQuery() to run DDL statements: create table

Posted on by coder 
   
 

using System;
using System.Data;
using System.Data.SqlClient;

class ExecuteDDL {
    public static void Main() {
        SqlConnection mySqlConnection = new SqlConnection("server=localhost;database=Northwind;uid=sa;pwd=sa");

        SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
        mySqlCommand.CommandText =
          "CREATE TABLE MyPersons (" +
          "  PersonID int CONSTRAINT PK_Persons PRIMARY KEY," +
          "  FirstName nvarchar(15) NOT NULL," +
          "  LastName nvarchar(15) NOT NULL," +
          "  DateOfBirth datetime" +
          ")";

        mySqlConnection.Open();
        Console.WriteLine("Creating MyPersons table");
        int result = mySqlCommand.ExecuteNonQuery();
        Console.WriteLine("mySqlCommand.ExecuteNonQuery() = " + result);
        mySqlCommand.CommandText =
          "ALTER TABLE MyPersons " +
          "ADD EmployerID nchar(5) CONSTRAINT FK_Persons_Customers " +
          "REFERENCES Customers(CustomerID)";

        result = mySqlCommand.ExecuteNonQuery();
        Console.WriteLine("mySqlCommand.ExecuteNonQuery() = " + result);
        mySqlCommand.CommandText = "DROP TABLE MyPersons";
        result = mySqlCommand.ExecuteNonQuery();
        Console.WriteLine("mySqlCommand.ExecuteNonQuery() = " + result);
        mySqlConnection.Close();
    }
}