Csharp/C Sharp by API/System.Data/DataView — различия между версиями

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Версия 15:31, 26 мая 2010

DataView.Find

 

using System;
using System.Data;
using System.Data.SqlClient;
class FindingDataRowViews {
    public static void Main() {
        SqlConnection mySqlConnection =
          new SqlConnection(
            "server=localhost;database=Northwind;uid=sa;pwd=sa"
          );
        SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
        mySqlCommand.rumandText =
          "SELECT CustomerID, CompanyName, Country " +
          "FROM Customers";
        SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
        mySqlDataAdapter.SelectCommand = mySqlCommand;
        DataSet myDataSet = new DataSet();
        mySqlConnection.Open();
        mySqlDataAdapter.Fill(myDataSet, "Customers");
        mySqlConnection.Close();
        DataTable customersDT = myDataSet.Tables["Customers"];
        string filterExpression = "Country = "UK"";
        string sortExpression = "CustomerID";
        DataViewRowState rowStateFilter = DataViewRowState.OriginalRows;
        DataView customersDV = new DataView();
        customersDV.Table = customersDT;
        customersDV.RowFilter = filterExpression;
        customersDV.Sort = sortExpression;
        customersDV.RowStateFilter = rowStateFilter;
        foreach (DataRowView myDataRowView in customersDV) {
            for (int count = 0; count < customersDV.Table.Columns.Count; count++) {
                Console.WriteLine(myDataRowView[count]);
            }
            Console.WriteLine("");
        }
        int index = customersDV.Find("BSBEV");
        Console.WriteLine("BSBEV found at index " + index + "\n");
        DataRowView[] customersDRVs = customersDV.FindRows("BSBEV");
        foreach (DataRowView myDataRowView in customersDRVs) {
            for (int count = 0; count < customersDV.Table.Columns.Count; count++) {
                Console.WriteLine(myDataRowView[count]);
            }
            Console.WriteLine("");
        }
    }
}


DataView.FindRows

 


using System;
using System.Data;
using System.Data.SqlClient;
class FindingDataRowViews {
    public static void Main() {
        SqlConnection mySqlConnection =
          new SqlConnection(
            "server=localhost;database=Northwind;uid=sa;pwd=sa"
          );
        SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
        mySqlCommand.rumandText =
          "SELECT CustomerID, CompanyName, Country " +
          "FROM Customers";
        SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
        mySqlDataAdapter.SelectCommand = mySqlCommand;
        DataSet myDataSet = new DataSet();
        mySqlConnection.Open();
        mySqlDataAdapter.Fill(myDataSet, "Customers");
        mySqlConnection.Close();
        DataTable customersDT = myDataSet.Tables["Customers"];
        string filterExpression = "Country = "UK"";
        string sortExpression = "CustomerID";
        DataViewRowState rowStateFilter = DataViewRowState.OriginalRows;
        DataView customersDV = new DataView();
        customersDV.Table = customersDT;
        customersDV.RowFilter = filterExpression;
        customersDV.Sort = sortExpression;
        customersDV.RowStateFilter = rowStateFilter;
        foreach (DataRowView myDataRowView in customersDV) {
            for (int count = 0; count < customersDV.Table.Columns.Count; count++) {
                Console.WriteLine(myDataRowView[count]);
            }
            Console.WriteLine("");
        }
        int index = customersDV.Find("BSBEV");
        Console.WriteLine("BSBEV found at index " + index + "\n");
        DataRowView[] customersDRVs = customersDV.FindRows("BSBEV");
        foreach (DataRowView myDataRowView in customersDRVs) {
            for (int count = 0; count < customersDV.Table.Columns.Count; count++) {
                Console.WriteLine(myDataRowView[count]);
            }
            Console.WriteLine("");
        }
    }
}


DataView.RowFilter

 

using System;
using System.Data;
using System.Data.SqlClient;
class FindingDataRowViews
{
  public static void Main()
  {
    SqlConnection mySqlConnection =new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");
    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
    mySqlCommand.rumandText =
      "SELECT ID, FirstName, LastName " +
      "FROM Employee";
    SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
    mySqlDataAdapter.SelectCommand = mySqlCommand;
    DataSet myDataSet = new DataSet();
    mySqlConnection.Open();
    mySqlDataAdapter.Fill(myDataSet, "Employee");
    mySqlConnection.Close();
    DataTable employeeDT = myDataSet.Tables["Employee"];
    string filterExpression = "ID = 9";
    string sortExpression = "ID";
    DataViewRowState rowStateFilter = DataViewRowState.OriginalRows;
    DataView employeeDV = new DataView();
    employeeDV.Table = employeeDT;
    employeeDV.RowFilter = filterExpression;
    employeeDV.Sort = sortExpression;
    employeeDV.RowStateFilter = rowStateFilter;
    foreach (DataRowView myDataRowView in employeeDV)
    {
      for (int count = 0; count < employeeDV.Table.Columns.Count; count++)
      {
        Console.WriteLine(myDataRowView[count]);
      }
      Console.WriteLine("");
    }
    int index = employeeDV.Find("8");
    Console.WriteLine("8 found at index " + index + "\n");
    DataRowView[] employeeDRVs = employeeDV.FindRows("8");
    foreach (DataRowView myDataRowView in employeeDRVs)
    {
      for (int count = 0; count < employeeDV.Table.Columns.Count; count++)
      {
        Console.WriteLine(myDataRowView[count]);
      }
      Console.WriteLine("");
    }
  }
}


DataView.RowStateFilter

 

using System;
using System.Data;
using System.Data.SqlClient;
class FindingDataRowViews
{
  public static void Main()
  {
    SqlConnection mySqlConnection =new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");
    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
    mySqlCommand.rumandText =
      "SELECT ID, FirstName, LastName " +
      "FROM Employee";
    SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
    mySqlDataAdapter.SelectCommand = mySqlCommand;
    DataSet myDataSet = new DataSet();
    mySqlConnection.Open();
    mySqlDataAdapter.Fill(myDataSet, "Employee");
    mySqlConnection.Close();
    DataTable employeeDT = myDataSet.Tables["Employee"];
    string filterExpression = "ID = 9";
    string sortExpression = "ID";
    DataViewRowState rowStateFilter = DataViewRowState.OriginalRows;
    DataView employeeDV = new DataView();
    employeeDV.Table = employeeDT;
    employeeDV.RowFilter = filterExpression;
    employeeDV.Sort = sortExpression;
    employeeDV.RowStateFilter = rowStateFilter;
    foreach (DataRowView myDataRowView in employeeDV)
    {
      for (int count = 0; count < employeeDV.Table.Columns.Count; count++)
      {
        Console.WriteLine(myDataRowView[count]);
      }
      Console.WriteLine("");
    }
    int index = employeeDV.Find("8");
    Console.WriteLine("8 found at index " + index + "\n");
    DataRowView[] employeeDRVs = employeeDV.FindRows("8");
    foreach (DataRowView myDataRowView in employeeDRVs)
    {
      for (int count = 0; count < employeeDV.Table.Columns.Count; count++)
      {
        Console.WriteLine(myDataRowView[count]);
      }
      Console.WriteLine("");
    }
  }
}


DataView.Sort

 

using System;
using System.Data;
using System.Data.SqlClient;
class FindingDataRowViews
{
  public static void Main()
  {
    SqlConnection mySqlConnection =new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");
    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
    mySqlCommand.rumandText =
      "SELECT ID, FirstName, LastName " +
      "FROM Employee";
    SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
    mySqlDataAdapter.SelectCommand = mySqlCommand;
    DataSet myDataSet = new DataSet();
    mySqlConnection.Open();
    mySqlDataAdapter.Fill(myDataSet, "Employee");
    mySqlConnection.Close();
    DataTable employeeDT = myDataSet.Tables["Employee"];
    string filterExpression = "ID = 9";
    string sortExpression = "ID";
    DataViewRowState rowStateFilter = DataViewRowState.OriginalRows;
    DataView employeeDV = new DataView();
    employeeDV.Table = employeeDT;
    employeeDV.RowFilter = filterExpression;
    employeeDV.Sort = sortExpression;
    employeeDV.RowStateFilter = rowStateFilter;
    foreach (DataRowView myDataRowView in employeeDV)
    {
      for (int count = 0; count < employeeDV.Table.Columns.Count; count++)
      {
        Console.WriteLine(myDataRowView[count]);
      }
      Console.WriteLine("");
    }
    int index = employeeDV.Find("8");
    Console.WriteLine("8 found at index " + index + "\n");
    DataRowView[] employeeDRVs = employeeDV.FindRows("8");
    foreach (DataRowView myDataRowView in employeeDRVs)
    {
      for (int count = 0; count < employeeDV.Table.Columns.Count; count++)
      {
        Console.WriteLine(myDataRowView[count]);
      }
      Console.WriteLine("");
    }
  }
}


DataView.Table

 

using System;
using System.Data;
using System.Data.SqlClient;
class FindingDataRowViews
{
  public static void Main()
  {
    SqlConnection mySqlConnection =new SqlConnection("server=(local)\\SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI;");
    SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
    mySqlCommand.rumandText =
      "SELECT ID, FirstName, LastName " +
      "FROM Employee";
    SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
    mySqlDataAdapter.SelectCommand = mySqlCommand;
    DataSet myDataSet = new DataSet();
    mySqlConnection.Open();
    mySqlDataAdapter.Fill(myDataSet, "Employee");
    mySqlConnection.Close();
    DataTable employeeDT = myDataSet.Tables["Employee"];
    string filterExpression = "ID = 9";
    string sortExpression = "ID";
    DataViewRowState rowStateFilter = DataViewRowState.OriginalRows;
    DataView employeeDV = new DataView();
    employeeDV.Table = employeeDT;
    employeeDV.RowFilter = filterExpression;
    employeeDV.Sort = sortExpression;
    employeeDV.RowStateFilter = rowStateFilter;
    foreach (DataRowView myDataRowView in employeeDV)
    {
      for (int count = 0; count < employeeDV.Table.Columns.Count; count++)
      {
        Console.WriteLine(myDataRowView[count]);
      }
      Console.WriteLine("");
    }
    int index = employeeDV.Find("8");
    Console.WriteLine("8 found at index " + index + "\n");
    DataRowView[] employeeDRVs = employeeDV.FindRows("8");
    foreach (DataRowView myDataRowView in employeeDRVs)
    {
      for (int count = 0; count < employeeDV.Table.Columns.Count; count++)
      {
        Console.WriteLine(myDataRowView[count]);
      }
      Console.WriteLine("");
    }
  }
}


DataView.Table.Columns

 


using System;
using System.Data;
using System.Data.SqlClient;
class FindingDataRowViews {
    public static void Main() {
        SqlConnection mySqlConnection =
          new SqlConnection(
            "server=localhost;database=Northwind;uid=sa;pwd=sa"
          );
        SqlCommand mySqlCommand = mySqlConnection.CreateCommand();
        mySqlCommand.rumandText =
          "SELECT CustomerID, CompanyName, Country " +
          "FROM Customers";
        SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();
        mySqlDataAdapter.SelectCommand = mySqlCommand;
        DataSet myDataSet = new DataSet();
        mySqlConnection.Open();
        mySqlDataAdapter.Fill(myDataSet, "Customers");
        mySqlConnection.Close();
        DataTable customersDT = myDataSet.Tables["Customers"];
        string filterExpression = "Country = "UK"";
        string sortExpression = "CustomerID";
        DataViewRowState rowStateFilter = DataViewRowState.OriginalRows;
        DataView customersDV = new DataView();
        customersDV.Table = customersDT;
        customersDV.RowFilter = filterExpression;
        customersDV.Sort = sortExpression;
        customersDV.RowStateFilter = rowStateFilter;
        foreach (DataRowView myDataRowView in customersDV) {
            for (int count = 0; count < customersDV.Table.Columns.Count; count++) {
                Console.WriteLine(myDataRowView[count]);
            }
            Console.WriteLine("");
        }
        int index = customersDV.Find("BSBEV");
        Console.WriteLine("BSBEV found at index " + index + "\n");
        DataRowView[] customersDRVs = customersDV.FindRows("BSBEV");
        foreach (DataRowView myDataRowView in customersDRVs) {
            for (int count = 0; count < customersDV.Table.Columns.Count; count++) {
                Console.WriteLine(myDataRowView[count]);
            }
            Console.WriteLine("");
        }
    }
}
Источник — «http://nfex.ru/index.php?title=Csharp/C_Sharp_by_API/System.Data/DataView&oldid=4929»