/// <summary>
/// Sum
/// </summary>
/// <param name="expression">表达式树</param>
/// <returns>SqlBuilderCore</returns>
public SqlBuilderCore <T> Sum(Expression <Func <T, object> > expression)
{
this._sqlPack.Clear();
this._sqlPack.IsSingleTable = true;
SqlBuilderProvider.Sum(expression.Body, this._sqlPack);
return(this);
}
/// <summary>
/// Sum
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Sum(UnaryExpression expression, SqlPack sqlPack)
{
SqlBuilderProvider.Sum(expression.Operand, sqlPack);
return(sqlPack);
}