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WispEntityManager.pas
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WispEntityManager.pas
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unit WispEntityManager;
// Read About Entities here : https://en.wikipedia.org/wiki/Entity%E2%80%93relationship_model
interface
uses
SysUtils,
DateUtils,
ZDataset,
ZConnection,
ZAbstractConnection,
WispEntity,
WispArrayTools,
Dialogs,
WispDbStructureTools,
WispDbConnection,
WispQueryTools,
WispStrTools,
WispTimeTools,
WispReportManager,
WispDefaultValue;
type
TEntityManager = Class(TObject)
Private
aEntity: array of TEntity;
FEntityCount: Integer;
Public
Property EntityCount: Integer Read FEntityCount;
Constructor Create; reintroduce;
// Read about "reintroduce" in the link below :
// http://docwiki.embarcadero.com/RADStudio/XE8/fr/W1010_La_m%C3%A9thode_'%25s'_cache_la_m%C3%A9thode_virtuelle_du_type_de_base_'%25s'_(Delphi)
Procedure RegisterEntity(ParamEntityName, ParamDisplayName: string);
Function GetEntityByName(ParamEntityName: string): TEntity;
Function GetEntityCount(): Integer;
Function GetEntityById(ParamId: Integer): TEntity;
Function GetEntityCounter(ParamEntityName: string): Integer;
Procedure IncrementEntityCounter(ParamEntityName: string);
Function GetEpByName(ParamEntity: TEntity; ParamEpName: String)
: TEntityProperty;
Function GetTimeAlertState(ParamEntityName, ParamEDName,
ParamId: String): Boolean;
Function GetEdByName(ParamEntity: TEntity; ParamEDName: String)
: TEntityDecorator;
//Function GetEntityInstanceSelectQueryStrin(ParamEntityName,
// ParamEntityId: String): String;
Destructor Destroy; override;
End;
var
Global_Singleton_EntityManager: TEntityManager;
E: TEntityManager; // Shorter version
LHE: TEntity; // Last handled entity
LastHandledEP: TEntityProperty;
LastHandledEO: TEntityOperation;
LastHandledED: TEntityDecorator;
LastHandledDV: TWispDefaultValue;
implementation
// =============================================================================
Constructor TEntityManager.Create;
begin
if Global_Singleton_EntityManager <> nil then
begin
// Lets try ...
Self := Global_Singleton_EntityManager;
end
else
begin
inherited Create();
Global_Singleton_EntityManager := Self;
E := Self;
with Global_Singleton_EntityManager do
begin
FEntityCount := 0;
end;
// Database structure : entities
If Not(CheckIfTableExists(Global_Singleton_DbConnection,
'wisp_entities')) Then
begin
ExecuteQuery(Global_Singleton_DbConnection,
'CREATE TABLE ' + 'wisp_entities' + sLineBreak + '(' + sLineBreak +
' ID INT NOT NULL AUTO_INCREMENT,' + sLineBreak +
' NAME VARCHAR(255) NOT NULL,' + sLineBreak + ' COUNTER INT NOT NULL,' +
sLineBreak + ' PRIMARY KEY (`ID`));');
end;
end;
end;
// =============================================================================
Destructor TEntityManager.Destroy;
begin
if Global_Singleton_EntityManager = Self then
Global_Singleton_EntityManager := nil;
inherited Destroy;
end;
// =============================================================================
Procedure FreeGlobalObjects; far;
begin
if Global_Singleton_EntityManager <> nil then
Global_Singleton_EntityManager.Free;
end;
// =============================================================================
Procedure TEntityManager.RegisterEntity(ParamEntityName,
ParamDisplayName: string);
begin
FEntityCount := FEntityCount + 1;
SetLength(aEntity, FEntityCount);
aEntity[FEntityCount - 1] := TEntity.Create(ParamEntityName,
ParamDisplayName);
LHE := aEntity[FEntityCount - 1];
// Database structure
If Not(CheckIfTableExists(Global_Singleton_DbConnection,
'entity_' + ParamEntityName)) Then
AddTable(Global_Singleton_DbConnection, 'entity_' + ParamEntityName, TRUE);
// Check if entity exists in entity table
If OpenQuery(Global_Singleton_DbConnection,
'SELECT * FROM wisp_entities WHERE NAME = "' + ParamEntityName + '";')
.RecordsAvailable = TRUE Then
// its okey
Else
ExecuteQuery(Global_Singleton_DbConnection, 'INSERT INTO ' + 'wisp_entities'
+ ' ' + '(NAME, COUNTER)' + ' VALUES ' + '("' + ParamEntityName +
'", 0)' + ';');
// Add empty reports to DB
Global_Singleton_ReportManager.RegisterEntityReportToDb(ParamEntityName);
end;
// =============================================================================
Function TEntityManager.GetEntityByName(ParamEntityName: string): TEntity;
var
i: Integer;
begin
for i := 0 to FEntityCount - 1 do
begin
if aEntity[i].GetEntityName = ParamEntityName then
begin
Result := aEntity[i];
EXIT;
end;
end;
Result := nil;
ShowMessage('Entity named ' + ParamEntityName + ' Not found');
end;
// =============================================================================
Function TEntityManager.GetEntityCount(): Integer;
begin
Result := FEntityCount;
end;
// ==============================================================================
Function TEntityManager.GetEntityCounter(ParamEntityName: string): Integer;
begin
Result := StrToInt(OpenQuery(Global_Singleton_DbConnection,
'SELECT COUNTER FROM wisp_entities WHERE NAME="' + ParamEntityName + '";')
.FirstFieldAsString);
end;
// ==============================================================================
Procedure TEntityManager.IncrementEntityCounter(ParamEntityName: string);
begin
ExecuteQuery(Global_Singleton_DbConnection,
'UPDATE wisp_entities SET COUNTER= COUNTER+1 WHERE NAME="' +
ParamEntityName + '";');
end;
// =============================================================================
Function TEntityManager.GetEntityById(ParamId: Integer): TEntity;
begin
Result := aEntity[ParamId];
end;
// =============================================================================
Function TEntityManager.GetEpByName(ParamEntity: TEntity; ParamEpName: String)
: TEntityProperty;
Var
i, TmpI: Integer;
begin
TmpI := Length(ParamEntity.aProperty);
Result := nil;
if TmpI = 0 then
Result := nil
else if TmpI >= 1 then
begin
for i := 0 to TmpI - 1 do
begin
if TEntityProperty(ParamEntity.aProperty[i]).Name = ParamEpName then
begin
Result := TEntityProperty(ParamEntity.aProperty[i]);
end;
end;
end;
end;
// =============================================================================
Function TEntityManager.GetEdByName(ParamEntity: TEntity; ParamEDName: String)
: TEntityDecorator;
Var
i, TmpI: Integer;
begin
TmpI := Length(ParamEntity.aDecorator);
Result := nil;
if TmpI = 0 then
Result := nil
else if TmpI >= 1 then
begin
for i := 0 to TmpI - 1 do
begin
if TEntityDecorator(ParamEntity.aDecorator[i]).Name = ParamEDName then
begin
Result := TEntityDecorator(ParamEntity.aDecorator[i]);
end;
end;
end;
end;
// =============================================================================
Function TEntityManager.GetTimeAlertState(ParamEntityName, ParamEDName,
ParamId: String): Boolean;
Var
TmpEntity: TEntity;
TmpEd: TEDTimeAlert;
TmpEpDate: TEPDate;
TmpEpTime: TEPTime;
TmpEpOffset: TEPText;
Q: TZQuery;
ColDate, ColTime, ColOffset: String;
S, U, DateStr, TimeStr, OffsetStr: String;
Offset, OffsetSec: Int64;
aDate, aTime: TArrayOfString;
Origin, Offseted, Now_: TDateTime;
begin
TmpEntity := GetEntityByName(ParamEntityName);
TmpEd := TEDTimeAlert(GetEdByName(TmpEntity, ParamEDName));
TmpEpDate := TEPDate(GetEpByName(TmpEntity, TmpEd.OriginDateProperty));
TmpEpTime := TEPTime(GetEpByName(TmpEntity, TmpEd.OriginTimeProperty));
TmpEpOffset := TEPText(GetEpByName(TmpEntity, TmpEd.OffsetProperty));
U := TmpEd.OffsetUnit;
if TmpEpTime = nil then
begin
ColDate := TmpEpDate.GetDbColumnName;
// ColTime := TmpEpTime.GetDbColumnName;
ColOffset := TmpEpOffset.GetDbColumnName;
Q := OpenQuery(Global_Singleton_DbConnection, 'SELECT ' + ColDate + ',' +
ColOffset + ' FROM entity_' + TmpEntity.GetEntityName + ' WHERE ID=' +
ParamId + ';').ZQuery;
DateStr := Q.FieldByName(ColDate).AsString;
TimeStr := '00:00:00';
// Since the origin time property can be left blank by the developper
OffsetStr := Q.FieldByName(ColOffset).AsString;
end
else if TmpEpTime <> nil then
begin
ColDate := TmpEpDate.GetDbColumnName;
ColTime := TmpEpTime.GetDbColumnName;
ColOffset := TmpEpOffset.GetDbColumnName;
Q := OpenQuery(Global_Singleton_DbConnection, 'SELECT ' + ColDate + ',' +
ColTime + ',' + ColOffset + ' FROM entity_' + TmpEntity.GetEntityName +
' WHERE ID=' + ParamId + ';').ZQuery;
DateStr := Q.FieldByName(ColDate).AsString;
TimeStr := Q.FieldByName(ColTime).AsString;
OffsetStr := Q.FieldByName(ColOffset).AsString;
end;
if OffsetStr = '' then
Offset := 0
else
Offset := StrToInt(OffsetStr);
if DateStr = '' then
begin
Result := FALSE;
EXIT;
end;
if U = '' then
U := 'D';
if U = 'Y' then
OffsetSec := Offset * 365 * 86400
else if U = 'M' then
OffsetSec := Offset * 30 * 86400
else if U = 'D' then
OffsetSec := Offset * 86400
else if U = 'H' then
OffsetSec := Offset * 3600
else if U = 'M' then
OffsetSec := Offset * 60
else
OffsetSec := Offset;
aDate := WispStringSplit(DateStr, '/');
aTime := WispStringSplit(TimeStr, ':');
Origin := EncodeDateTime(StrToInt(aDate[2]), StrToInt(aDate[1]),
StrToInt(aDate[0]), StrToInt(aTime[0]), StrToInt(aTime[1]),
StrToInt(aTime[2]), 0);
Now_ := GetNowFromServer;
if TmpEd.OffsetDirection = TRUE then
begin
Offseted := IncSecond(Origin, OffsetSec);
if Now_ >= Offseted then
Result := TRUE;
end
else if TmpEd.OffsetDirection = FALSE then
begin
Offseted := IncSecond(Origin, OffsetSec * -1);
if Now <= Offseted then
Result := TRUE;
end
else
Result := FALSE;
end;
// =============================================================================
{
Function TEntityManager.GetEntityInstanceSelectQueryStrin(ParamEntityName,
ParamEntityId: String): String;
begin
if ParamEntityId = '0' then
begin
Result := 'SELECT * FROM entity_' + ParamEntityName + ';'
end
else
begin
Result := 'SELECT * FROM entity_' + ParamEntityName + ' WHERE ID="' +
ParamEntityId + '";'
end;
end;}
// =============================================================================
begin
AddExitProc(FreeGlobalObjects);
end.