public void Extensions_T004_IDataReader_ToDelimitedFile()
{
const long RowsToRead = 50;
string CmdText = "select top " + RowsToRead.ToString() + " * from [Northwind].[dbo].[Customers]";
const int BufferSize = 1024 * 4;
const string TestFile = "c:\\temp\\test.csv";
//var Provider = DBHelper.Providers.OleDB; // 12 sec
var Provider = DBHelper.Providers.SqlServer; // 08 sec
//var Provider = DBHelper.Providers.ODBC; // 20 sec
string Cnstring = string.Empty;
switch (Provider)
{
case DBHelper.Providers.SqlServer:
//Cnstring = SQL_PROD_CONNECTIONSTRING;
Cnstring = SQL_SQLSERVER_LOCALDB_CONNECTIONSTRING;
break;
case DBHelper.Providers.OleDB:
Cnstring = SQL_OLEDB_LOCALDB_CONNECTIONSTRING;
break;
case DBHelper.Providers.ODBC:
Cnstring = SQL_ODBC_LOCALDB_CONNECTIONSTRING;
break;
case DBHelper.Providers.Oracle:
break;
default:
break;
}
long FileRows = 0;
// create a connection object
using (var dbh = new DBHelper(false))
{
dbh.CreateDBObjects(Cnstring, Provider, null);
DbDataReader rdr = (DbDataReader)Utility.RetryMethod(new Func <string, CommandType, ConnectionState, DbDataReader>(dbh.ExecuteReader), 3, 3, CmdText, CommandType.Text, ConnectionState.Open);
FileRows = rdr.ToDelimitedFile(TestFile, false, Encoding.Default, BufferSize, true, textQualifier: "\"", columnDelimiter: "|");
}
var r = File.Exists(TestFile);
Assert.IsInstanceOfType(r, typeof(bool));
Assert.AreEqual(true, r);
Assert.AreEqual(RowsToRead, FileRows);
}
public void Utility_T004_RetryMethod()
{
const long RowsToRead = 90;
string CmdTextOK = "select top " + RowsToRead.ToString() + " * from [Northwind].[dbo].[Customers]";
string CmdTextWRONG = "select top " + RowsToRead.ToString() + " * [Northwind].[dbo].[XXXX]";
//var Provider = DBHelper.Providers.OleDB; // 12 sec
var Provider = DBHelper.Providers.SqlServer; // 08 sec
//var Provider = DBHelper.Providers.ODBC; // 20 sec
string Cnstring = string.Empty;
switch (Provider)
{
case DBHelper.Providers.SqlServer:
Cnstring = SQL_SQLSERVER_LOCALDB_CONNECTIONSTRING;
break;
case DBHelper.Providers.OleDB:
Cnstring = SQL_OLEDB_LOCALDB_CONNECTIONSTRING;
break;
case DBHelper.Providers.ODBC:
Cnstring = SQL_ODBC_LOCALDB_CONNECTIONSTRING;
break;
case DBHelper.Providers.Oracle:
break;
default:
break;
}
// create a connection object
using (var dbh = new DBHelper(false))
{
dbh.CreateDBObjects(Cnstring, Provider, null);
// Example without retries.
//var rdr = dbh.ExecuteReader(CmdText, CommandType.Text, ConnectionState.Open);
// Example with retries defining the delegate before and invoking in the Utility.RetryMethod note that the return type 'DataSet' is declared at the end, and the parameters types before.
var newfuction = new Func <string, CommandType, ConnectionState, DataSet>(dbh.GetDataSet); // You can define the delegate before or inside of the RetryMethod.
DataSet rdr = (DataSet)Utility.RetryMethod(newfuction, 3, 3, CmdTextOK, CommandType.Text, ConnectionState.Open);
//rdr = (DataSet)Utility.RetryMethod(newfuction, 3, 3, CmdTextWRONG, CommandType.Text, ConnectionState.Open);
// Example with retries defining the delegate inside and imvoking the Utility.RetryMethod note that the return type 'DbDataReader' is declared at the end and the parameters types before.
// DbDataReader rdr = (DbDataReader)Utility.RetryMethod(new Func<string, CommandType, ConnectionState, DbDataReader>(dbh.ExecuteReader), 3, 3, CmdTextOK, CommandType.Text, ConnectionState.Open);
Assert.IsInstanceOfType(rdr, typeof(DataSet));
Assert.AreEqual(RowsToRead, rdr.Tables[0].Rows.Count);
}
}
