private ConnectionData CreateConnectionData(DataTransaction transaction)
{
ConnectionData data = null;
try
{
if (transaction != null)
{
data = new ConnectionData(transaction.InnerTransaction);
}
else
{
data = new ConnectionData(CreateConnectionBase(ConnectionString));
}
PrepareConnectionCore(data);
return(data);
} catch
{
if (data != null)
{
data.Dispose();
}
throw;
};
}
/// <summary>Executes a command and returns the results as a <see cref="DataSet"/>.</summary>
/// <param name="transaction">The transaction to execute within. If it is <see langword="null"/> then no transaction is used.</param>
/// <param name="command">The command to execute.</param>
/// <returns>The results as a <see cref="DataSet"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="command"/> is <see langword="null"/>.</exception>
public DataSet ExecuteDataSet(DataCommand command, DataTransaction transaction)
{
if (command == null)
{
throw new ArgumentNullException("command");
}
using (var conn = CreateConnectionData(transaction))
{
return(ExecuteDataSetCore(conn, command));
};
}
/// <summary>Fills a data set with the results of a command.</summary>
/// <param name="transaction">The transaction to execute within. If it is <see langword="null"/> then no transaction is used.</param>
/// <param name="ds">The data set to fill.</param>
/// <param name="tables">The tables to use for storing the results.</param>
/// <param name="command">The command to execute.</param>
/// <exception cref="ArgumentNullException"><paramref name="ds"/> or <paramref name="command"/> is <see langword="null"/>.</exception>
public void FillDataSet(DataCommand command, DataSet ds, string[] tables, DataTransaction transaction)
{
if (ds == null)
{
throw new ArgumentNullException("ds");
}
if (command == null)
{
throw new ArgumentNullException("command");
}
using (var conn = CreateConnectionData(transaction))
{
FillDataSetCore(conn, ds, command, tables);
};
}
/// <summary>Executes a command and returns a data reader with the results.</summary>
/// <param name="transaction">The transaction to execute within. If it is <see langword="null"/> then no transaction is used.</param>
/// <param name="command">The command to execute.</param>
/// <returns>A <see cref="DbDataReader"/> containing the results. The reader may be empty but it will
/// never be <see langword="null"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="command"/> is <see langword="null"/>.</exception>
/// <seealso cref="O:ExecuteQueryWithResult{T}"/>
/// <seealso cref="O:ExecuteQueryWithResults{T}"/>
public DbDataReader ExecuteReader(DataCommand command, DataTransaction transaction)
{
if (command == null)
{
throw new ArgumentNullException("command");
}
using (var conn = CreateConnectionData(transaction))
{
var dr = ExecuteReaderCore(conn, command);
//The reader is now responsible for connection cleanup
conn.Detach();
return(dr);
};
}
/// <summary>Updates a <see cref="DataSet"/>.</summary>
/// <param name="transaction">The transaction to execute within. If it is <see langword="null"/> then no transaction is used.</param>
/// <param name="insertCommand">Command to use for insertions.</param>
/// <param name="deleteCommand">Command to use for deletions.</param>
/// <param name="updateCommand">Command to use for updates.</param>
/// <param name="ds"><see cref="DataSet"/> to use.</param>
/// <param name="table">The table to use when updating the command. If <see langword="null"/> or empty then the
/// first table is used.</param>
/// <remarks>
/// To support transactions, precede this call with ExecuteScalar("begin transaction"). Failure to
/// use transactions could cause failed updates to be partially applied.
/// <para/>
/// The command parameters can be <see langword="null"/> but the update will fail if the command is needed.
/// </remarks>
/// <exception cref="DBConcurrencyException">A concurrency error occurred.</exception>
/// <exception cref="ArgumentNullException"><paramref name="ds"/> is <see langword="null"/>.</exception>
public void UpdateDataSet(DataCommand insertCommand, DataCommand deleteCommand,
DataCommand updateCommand, DataSet ds, string table, DataTransaction transaction)
{
if (insertCommand == null)
{
throw new ArgumentNullException("insertCommand");
}
if (deleteCommand == null)
{
throw new ArgumentNullException("deleteCommand");
}
if (updateCommand == null)
{
throw new ArgumentNullException("updateCommand");
}
if (ds == null)
{
throw new ArgumentNullException("ds");
}
//Initialize table name as needed
table = (table ?? "").Trim();
if (String.IsNullOrEmpty(table) && (ds.Tables.Count > 0))
{
table = ds.Tables[0].TableName;
}
using (var conn = CreateConnectionData(transaction))
{
UpdateDataSetCore(conn, insertCommand, deleteCommand, updateCommand, ds, table);
};
}
/// <summary>Fills a data set with the results of a command.</summary>
/// <param name="transaction">The transaction to execute within. If it is <see langword="null"/> then no transaction is used.</param>
/// <param name="ds">The data set to fill.</param>
/// <param name="command">The command to execute.</param>
/// <exception cref="ArgumentNullException"><paramref name="ds"/> or <paramref name="command"/> is <see langword="null"/>.</exception>
public void FillDataSet(DataCommand command, DataSet ds, DataTransaction transaction)
{
FillDataSet(command, ds, null, transaction);
}
/// <summary>Executes a command and returns the first result.</summary>
/// <typeparam name="T">The type of the value returned.</typeparam>
/// <param name="transaction">The transaction to execute within. If it is <see langword="null"/> then no transaction is used.</param>
/// <param name="command">The command to execute.</param>
/// <returns>The first element from the result set.</returns>
/// <exception cref="ArgumentNullException"><paramref name="command"/> is <see langword="null"/>.</exception>
public T ExecuteScalar <T>(DataCommand command, DataTransaction transaction)
{
var result = ExecuteScalar(command, transaction);
return(((result != null) && (result != DBNull.Value)) ? (T)Convert.ChangeType(result, typeof(T)) : default(T));
}
/// <summary>Executes a command, parses the results and returns a strongly-typed array of objects.</summary>
/// <typeparam name="TResult">The type of the objects to return.</typeparam>
/// <param name="transaction">The transaction to execute within. If it is <see langword="null"/> then no transaction is used.</param>
/// <param name="command">The command to execute.</param>
/// <param name="converter">The method to use to convert the row to an object.</param>
/// <param name="data">User-provided data to parse to the delegate.</param>
/// <returns>An enumerable list containing the objects that were parsed. The list will never be <see langword="null"/>.</returns>
/// <exception cref="ArgumentNullException"><paramref name="command"/> or <paramref name="converter"/> is <see langword="null"/>.</exception>
/// <remarks>
/// This method combines the functionality of <see cref="O:ExecuteReader"/> with the standard code used to load data
/// from a reader into a business object. <paramref name="converter"/> is called once for each row to build the list
/// of data objects to return.
/// </remarks>
/// <seealso cref="O:ExecuteQueryWithResult{TResult}"/>
public IEnumerable <TResult> ExecuteQueryWithResults <TResult>(DataCommand command, Func <DbDataReader, Object, TResult> converter, object data, DataTransaction transaction)
{
if (converter == null)
{
throw new ArgumentNullException("converter");
}
var items = new List <TResult>();
using (var dr = ExecuteReader(command, transaction))
{
while (dr.Read())
{
items.Add(converter(dr, data));
}
};
return(items);
}
/// <summary>Executes a command, parses the result and returns a strongly-typed object.</summary>
/// <typeparam name="TResult">The type of the objects to return.</typeparam>
/// <param name="transaction">The transaction to execute within. If it is <see langword="null"/> then no transaction is used.</param>
/// <param name="command">The command to execute.</param>
/// <param name="converter">The method to convert the row to an object.</param>
/// <param name="data">The data to pass to the converter.</param>
/// <returns>An object containing the data that was parsed.</returns>
/// <exception cref="ArgumentNullException"><paramref name="command"/> or <paramref name="converter"/> is <see langword="null"/>.</exception>
/// <remarks>
/// This method combines the functionality of <see cref="O:ExecuteReader"/> with the standard code used to load data
/// from a reader into a business object. <paramref name="converter"/> is called once for each row to build the list
/// of data objects to return.
/// </remarks>
/// <seealso cref="O:ExecuteQueryWithResults{TResult}"/>
public TResult ExecuteQueryWithResult <TResult>(DataCommand command, Func <DbDataReader, object, TResult> converter, object data, DataTransaction transaction)
{
if (converter == null)
{
throw new ArgumentNullException("converter");
}
using (var dr = ExecuteReader(command, transaction))
{
if (dr.Read())
{
return(converter(dr, data));
}
};
return(default(TResult));
}
