public PgSqlCommand GetSqlCommand(TableDefinition tableDefinition)
{
var sqlCommand = new PgSqlCommand();
sqlCommand.AppendCommand("SELECT ");
if (_exists != null)
{
var existsCommand = _exists.GetSqlCommand(tableDefinition);
sqlCommand.AppendCommand(existsCommand.Command, existsCommand.Parameters);
return(sqlCommand);
}
if (_distinct != null)
{
if (_distinct is bool)
{
sqlCommand.AppendCommand($"DISTINCT ");
}
else if (_distinct is string)
{
sqlCommand.AppendCommand($"DISTINCT ON ({_distinct}) ");
}
}
var selectComm = _selectList.GetSqlCommand(tableDefinition);
sqlCommand.AppendCommandLine($"{selectComm.Command}", selectComm.Parameters);
if (_from != null)
{
var fromComm = _from.GetSqlCommand(tableDefinition);
sqlCommand.AppendCommandLine($"FROM {fromComm.Command}", fromComm.Parameters);
}
if (_where != null)
{
var whereComm = _where.GetSqlCommand(tableDefinition);
if (!String.IsNullOrWhiteSpace(whereComm.Command))
{
sqlCommand.AppendCommandLine($"WHERE {whereComm.Command}", whereComm.Parameters);
}
}
if (_groupBy != null)
{
var groupByComm = _groupBy.GetSqlCommand(tableDefinition);
sqlCommand.AppendCommandLine($"GROUP BY {groupByComm.Command}");
}
if (_orderBy != null)
{
var orderByComm = _orderBy.GetSqlCommand(tableDefinition);
sqlCommand.AppendCommandLine($"ORDER BY {orderByComm.Command}");
}
if (_offset != null)
{
var offsetComm = _offset.GetSqlCommand(tableDefinition);
sqlCommand.AppendCommandLine($"OFFSET {offsetComm.Command}");
}
if (_limit != null)
{
var limitComm = _limit.GetSqlCommand(tableDefinition);
sqlCommand.AppendCommandLine($"LIMIT {limitComm.Command}");
}
if (_for != null)
{
var forComm = _for.GetSqlCommand(tableDefinition);
sqlCommand.AppendCommandLine($"FOR {forComm.Command}");
}
return(sqlCommand);
}