/// <summary>
/// Create and return a command associated with the current connection.
/// </summary>
/// <param name="Connection">The connection.</param>
/// <param name="Query">The query.</param>
/// <param name="Arguments">The arguments.</param>
private static DbCommand _CreateCommand(this DbConnection Connection, string Query, params object[] Arguments)
{
// Create a command associated with the connection.
DbCommand Command = Connection.CreateCommand();
// Set the text command.
Command.CommandText = Query;
// Add a number of arguments to the command.
Command.Add(Arguments);
// Return the command.
return(Command);
}
/// <summary>
/// Add a number of arguments to the command.
/// </summary>
/// <param name="Command">The command.</param>
/// <param name="Arguments">The arguments.</param>
public static void Add(this DbCommand Command, params object[] Arguments)
{
// Check if an argument is available.
if (Arguments != null)
{
// Iterate through each argument.
foreach (object Argument in Arguments)
{
// Add an arguments to the command.
Command.Add(Argument);
}
}
}
/// <summary>
/// Delete each object.
/// </summary>
/// <param name="Connection">The connection.</param>
/// <param name="Transaction">The transaction.</param>
/// <param name="Objects">The objects.</param>
public async Task DeleteAsync(DbConnection Connection, DbTransaction Transaction, IEnumerable <T> Objects)
{
// Initialize a new instance of the List class.
List <KeyValuePair <DbCommand, T> > CommandSet = new List <KeyValuePair <DbCommand, T> >();
// Iterate through each object.
foreach (T Object in Objects)
{
// Check if the object is valid.
if (Object != null)
{
// Retrieve the primary key.
KeyValuePair <string, object> PrimaryKey = _HasValidPrimaryKey(Object);
// Check whether the object has a valid primary key.
if (PrimaryKey.Value != null)
{
// Create and return a command associated with the current connection.
DbCommand Command = Connection.CreateCommand();
// Set the command.
Command.CommandText = string.Format("DELETE FROM {0} WHERE {1} = @{2}",
// ... with the table name ...
_TableName,
// ... with the primary key ...
PrimaryKey.Key,
// ... and with the parameter count.
Command.Parameters.Count
);
// Set the transaction.
Command.Transaction = Transaction;
// Add the argument to the command.
Command.Add(PrimaryKey.Value);
// Add the command to the command set.
CommandSet.Add(new KeyValuePair <DbCommand, T>(Command, null));
}
}
}
// Execute a batch of commands and map an identity.
await _BatchAsync(Connection, CommandSet);
}
/// <summary>
/// Save each object.
/// </summary>
/// <param name="Connection">The connection.</param>
/// <param name="Transaction">The transaction.</param>
/// <param name="Objects">The objects.</param>
public async Task SaveAsync(DbConnection Connection, DbTransaction Transaction, IEnumerable <T> Objects)
{
// Initialize a new instance of the List class.
List <KeyValuePair <DbCommand, T> > CommandSet = new List <KeyValuePair <DbCommand, T> >();
// Iterate through each object.
foreach (T Object in Objects)
{
// Check if the object is valid.
if (Object != null)
{
// Create a command associated with the connection.
DbCommand Command = Connection.CreateCommand();
// Initialize the validation boolean.
bool IsValid = false;
// Retrieve the primary key.
KeyValuePair <string, object> PrimaryKey = _HasValidPrimaryKey(Object);
// Check whether the object has a valid primary key.
if (PrimaryKey.Value != null)
{
// Initialize a new instance of the StringBuilder class.
StringBuilder StringBuilder = new StringBuilder();
// Create an update command.
_CreateUpdateValues(Object, (Key, Value) => {
// Set the validation boolean.
IsValid = true;
// Append the set command.
StringBuilder.AppendFormat("{0} = @{1},", Key, Command.Parameters.Count);
// Add the argument to the command.
Command.Add(Value);
});
// Check if the validation boolean has been set.
if (IsValid)
{
// Set the command.
Command.CommandText = string.Format("UPDATE {0} SET {1} WHERE {2} = @{3}",
// ... with the table name ...
_TableName,
// ... with the values ...
StringBuilder.ToString().Substring(0, StringBuilder.Length - 1),
// ... with the primary key ...
PrimaryKey.Key,
// ... and with the parameter count.
Command.Parameters.Count
);
// Add the argument to the command.
Command.Add(PrimaryKey.Value);
// Add the command to the command set.
CommandSet.Add(new KeyValuePair <DbCommand, T>(Command, null));
}
}
else
{
// Initialize a new instance of the StringBuilder class.
StringBuilder StringBuilderColumns = new StringBuilder();
// Initialize a new instance of the StringBuilder class.
StringBuilder StringBuilderValues = new StringBuilder();
// Create an insert command.
_CreateInsertValues(Object, (Key, Value) => {
// Set the validation boolean.
IsValid = true;
// Append the column to the command.
StringBuilderColumns.AppendFormat("{0},", Key);
// Append the value to the command.
StringBuilderValues.AppendFormat("@{0},", Command.Parameters.Count);
// Add the argument to the command.
Command.Add(Value);
});
// Check if the validation boolean has been set.
if (IsValid)
{
// Set the command ...
Command.CommandText = string.Format("INSERT INTO {0} ({1}) VALUES ({2})",
// ... with the table name ...
_TableName,
// ... with the columns ...
StringBuilderColumns.ToString().Substring(0, StringBuilderColumns.Length - 1),
// ... and with the values.
StringBuilderValues.ToString().Substring(0, StringBuilderValues.Length - 1)
);
// Add the command to the command set.
CommandSet.Add(new KeyValuePair <DbCommand, T>(Command, _Identity ? Object : null));
}
}
}
}
// Execute a batch of commands.
await _BatchAsync(Connection, CommandSet);
}
