в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

Admin: 1 версия

2010-05-26T12:19:08Z

1 версия

Новая страница

==Create Database connection from DbProviderFactory==

<source lang="csharp">using System;
using System.Data;
using System.Data.rumon;
using System.Collections.Generic;
using System.Text;
class Program
{
static void Main(string[] args)
{
DbProviderFactory factory = DbProviderFactories.GetFactory("System.Data.SqlClient");
DbConnection conn = factory.CreateConnection();
conn.ConnectionString = "data source=localhost; initial catalog=SampleDB; Integrated Security=SSPI;";
conn.Open();
if (factory.CanCreateDataSourceEnumerator)
{
DbDataSourceEnumerator dsEnum = factory.CreateDataSourceEnumerator();
DataTable sources = dsEnum.GetDataSources();
foreach (DataRow dataSource in sources.Rows)
{
Console.WriteLine(dataSource["ServerName"]);
}
}

}
}</source>

==Get the list of ADO.NET data providers registered in the machine and application configuration file==

<source lang="csharp">using System;
using System.Data;
using System.Data.rumon;
class MainClass
{
public static void Main(string[] args)
{
using (DataTable providers = DbProviderFactories.GetFactoryClasses())
{
Console.WriteLine("Available ADO.NET Data Providers:");
foreach (DataRow prov in providers.Rows)
{
Console.WriteLine("Name:{0}", prov["Name"]);
Console.WriteLine("Description:{0}", prov["Description"]);
Console.WriteLine("Invariant Name:{0}", prov["InvariantName"]);
}
}
}
}</source>
<pre class=codeResult>Available ADO.NET Data Providers:
Name:Odbc Data Provider
Description:.Net Framework Data Provider for Odbc
Invariant Name:System.Data.Odbc
Name:OleDb Data Provider
Description:.Net Framework Data Provider for OleDb
Invariant Name:System.Data.OleDb
Name:OracleClient Data Provider
Description:.Net Framework Data Provider for Oracle
Invariant Name:System.Data.OracleClient
Name:SqlClient Data Provider
Description:.Net Framework Data Provider for SqlServer
Invariant Name:System.Data.SqlClient</pre>

==OleDbProvider==

<source lang="csharp">using System;
using System.Data;
using System.Data.OleDb;
class OleDbProvider
{
static void Main(string[] args)
{
string connString = @"provider = sqloledb;data source = .\sqlexpress;integrated security = sspi;initial catalog = northwind";
string sql = @"select * from employees";
OleDbConnection conn = null;
OleDbDataReader reader = null;
try
{
conn = new OleDbConnection(connString);
conn.Open();
OleDbCommand cmd = new OleDbCommand(sql, conn);
reader = cmd.ExecuteReader();
while (reader.Read())
{
Console.WriteLine(
"{0} | {1}"
, reader["FirstName"].ToString().PadLeft(10)
, reader[1].ToString().PadLeft(10)
);
}
}
catch (Exception e)
{
Console.WriteLine("Error: " + e);
}
finally
{
reader.Close();
conn.Close();
}
}
}</source>

← Предыдущая	Версия 15:31, 26 мая 2010
(нет различий)

Csharp/CSharp Tutorial/ADO.Net/Data Provider - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия