unit PurchasePlan;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  wItem,
  FireDAC.Stan.Intf,
  FireDAC.Stan.Option, FireDAC.Stan.Error, FireDAC.UI.Intf, FireDAC.Phys.Intf,
  FireDAC.Stan.Def, FireDAC.Stan.Pool, FireDAC.Stan.Async, FireDAC.Phys,
  FireDAC.Stan.Param, FireDAC.DatS, FireDAC.DApt.Intf, FireDAC.DApt,
  FireDAC.Phys.PGDef, FireDAC.VCLUI.Wait, FireDAC.Comp.UI, FireDAC.Phys.PG,
  Data.DB, FireDAC.Comp.DataSet, FireDAC.Comp.Client
  ;

type
  TPurchasePlan = class(TwItem)
  private
    { Private declarations }
    FOrdNum: string;
    FQty: string;
    FUnitt: string;
    FUnitPrice: string;
    FAmount: string;
    FOrdDate: string;
  protected
    { Protected declarations }
  public
    { Public declarations }
    class function xGetPurchasePlanLastNumber(AQuery: TFDQuery; column: string): string;
    class function LoadFromStringQuery(AQuery: TFDQuery; column: string): TStrings;
    class function xGetStrsDistinctProductName(AQuery: TFDQuery): TStrings;
    class function xAddSqlMark(velStr: string): string;
    class function xGetStrsProdNameBySumQty(AQuery: TFDQuery; prod, stDate, enDate: string): TStrings;
    class function LoadFromStringsQuery(AQuery: TFDQuery; columns: TStrings): TStrings;
  published
    { Published declarations }
    property OrdNum: string read FOrdNum write FOrdNum;
    property Qty: string read FQty write FQty;
    property Unitt: string read FUnitt write FUnitt;
    property UnitPrice: string read FUnitPrice write FUnitPrice;
    property Amount: string read FAmount write FAmount;
    property OrdDate: string read FOrdDate write FOrdDate;
  end;

implementation

{ TPurchasePlan }

class function TPurchasePlan.LoadFromStringQuery(AQuery: TFDQuery;
  column: string): TStrings;
var
  valStr: string;
begin
  Result := TStringList.Create;
  while not AQuery.Eof do begin
    valStr := AQuery.FieldByName(column).AsString;
    Result.Add(valStr);

    AQuery.Next;
  end;
end;

class function TPurchasePlan.LoadFromStringsQuery(AQuery: TFDQuery;
  columns: TStrings): TStrings;
var
  i: Integer;
  valStr, sumval: string;
begin
  Result := TStringList.Create;
  AQuery.First;
  while not AQuery.Eof do begin
    sumval := '';
    for i := 0 to columns.Count-1 do begin
      valStr := AQuery.FieldByName(columns.Strings[i]).AsString;
      if i = 0 then sumval := valStr
      else sumval := sumval + ';' + valStr;
    end;
    Result.Add(sumval);

    AQuery.Next;
  end;
end;

class function TPurchasePlan.xAddSqlMark(velStr: string): string;
begin
  Result := '';
  Result := '''' + velStr + '''';
end;

class function TPurchasePlan.xGetPurchasePlanLastNumber(AQuery: TFDQuery;
  column: string): string;
var
  sql: string;
  resStrs: TStrings;
begin
  Result := '';
  sql := 'SELECT COUNT(*) FROM "PurchasePlan"';
  try
    AQuery.Close;
    AQuery.SQL.Text := sql;
    AQuery.Open;
  except
    on E: Exception do ShowMessage('xGetPurchasePlanLastNumber Äõ¸® ½ÇÇà ¿À·ù: ' + E.Message);
  end;
  resStrs := LoadFromStringQuery(AQuery, column);
  if resStrs.Count > 0 then begin
    Result := resStrs.Strings[0];
  end;
  resStrs.Free;
end;

class function TPurchasePlan.xGetStrsDistinctProductName(
  AQuery: TFDQuery): TStrings;
var
  sql, column: string;
begin
  Result := nil;
  sql := 'SELECT DISTINCT "Name" FROM "PurchasePlan"';
  sql := sql + ' WHERE "IsValid"=' + xAddSqlMark('t');

  try
    AQuery.Close;
    AQuery.SQL.Text := sql;
    AQuery.Open;
  except
    on E: Exception do ShowMessage('xGetStrsDistinctProductName Äõ¸® ½ÇÇà ¿À·ù: ' + E.Message);
  end;

  column := 'Name';
  Result := LoadFromStringQuery(AQuery, column);
end;

class function TPurchasePlan.xGetStrsProdNameBySumQty(AQuery: TFDQuery; prod,
  stDate, enDate: string): TStrings;
var
  sql: string;
  columns: TStrings;
begin
  sql := 'SELECT "Name" AS prodname,';
  sql := sql + ' TO_CHAR(DATE_TRUNC(' + xAddSqlMark('month') + ', "OrdDate"), ' + xAddSqlMark('YYYY-MM') + ') AS mon,';
  sql := sql + ' TO_CHAR(DATE_TRUNC(' + xAddSqlMark('month') + ', "OrdDate"), '
             +  xAddSqlMark('FMMM') + ') || ' + xAddSqlMark('¿ù') + ' AS montext,';

  sql := sql + ' SUM("Amount") AS sumqty';
  sql := sql + ' FROM "PurchasePlan"';
  sql := sql + ' WHERE "IsValid" =' + xAddSqlMark('t');
  if Length(prod) > 0 then sql := sql + ' AND "Name" =' + xAddSqlMark(prod);
  if Length(Trim(stDate)) > 0 then begin
    sql := sql + ' AND "OrdDate">=' + xAddSqlMark(stDate);
    sql := sql + ' AND "OrdDate"<=' + xAddSqlMark(enDate);
  end;

  sql := sql + ' GROUP BY "prodname", DATE_TRUNC(' + xAddSqlMark('month') + ', "OrdDate")';
  sql := sql + ' ORDER BY "prodname", mon';

  try
    AQuery.Close;
    AQuery.SQL.Text := sql;
    AQuery.Open;
  except
    on E: Exception do ShowMessage('xGetStrsProdNameBySumQty Äõ¸® ½ÇÇà ¿À·ù: ' + E.Message);
  end;
  columns := TStringList.Create;
  columns.Add('prodname'); columns.Add('mon'); columns.Add('montext'); columns.Add('sumqty');

  Result := LoadFromStringsQuery(AQuery, columns);
  columns.Free;
end;

end.