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Quick.DAO.Database.pas
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Quick.DAO.Database.pas
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{ ***************************************************************************
Copyright (c) 2016-2020 Kike Pérez
Unit : Quick.DAO.Database
Description : DAO Database
Author : Kike Pérez
Version : 1.2
Created : 22/06/2018
Modified : 14/04/2020
This file is part of QuickDAO: https://github.com/exilon/QuickDAO
***************************************************************************
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*************************************************************************** }
unit Quick.DAO.Database;
{$i QuickDAO.inc}
interface
uses
SysUtils,
Classes,
Rtti,
TypInfo,
{$IFDEF FPC}
rttiutils,
fpjson,
jsonparser,
strUtils,
//jsonreader,
//fpjsonrtti,
Quick.Json.fpc.Compatibility,
{$ELSE}
{$IFDEF DELPHIXE7_UP}
System.Json,
{$ENDIF}
{$ENDIF}
Quick.Json.Serializer,
Quick.DAO,
Quick.DAO.Factory.QueryGenerator;
type
IDBConnectionSettings = interface
['{B4AE214B-432F-409C-8A15-AEEEE39CBAB5}']
function GetProvider : TDBProvider;
function GetServer : string;
function GetDatabase : string;
function GetUserName : string;
function GetPassword : string;
property Provider : TDBProvider read GetProvider;
property Server : string read GetServer;
property Database : string read GetDatabase;
property UserName : string read GetUserName;
property Password : string read GetPassword;
function IsCustomConnectionString : Boolean;
procedure FromConnectionString(aDBProviderID : Integer; const aConnectionString: string);
function GetCustomConnectionString : string;
end;
TDBConnectionSettings = class(TInterfacedObject,IDBConnectionSettings)
private
fDBProvider : TDBProvider;
fServer : string;
fDatabase : string;
fUserName : string;
fPassword : string;
fCustomConnectionString : string;
fIsCustomConnectionString : Boolean;
function GetProvider : TDBProvider; virtual;
function GetServer : string;
function GetDatabase : string;
function GetUserName : string;
function GetPassword : string;
public
constructor Create;
property Provider : TDBProvider read GetProvider write fDBProvider;
property Server : string read fServer write fServer;
property Database : string read fDatabase write fDatabase;
property UserName : string read fUserName write fUserName;
property Password : string read fPassword write fPassword;
function IsCustomConnectionString : Boolean;
procedure FromConnectionString(aDBProviderID : Integer; const aConnectionString: string);
function GetCustomConnectionString : string;
function Clone : TDBConnectionSettings;
end;
TDAODataBase = class
private
fDBConnection : TDBConnectionSettings;
fOwnsConnection : Boolean;
fQueryGenerator : IDAOQueryGenerator;
fModels : TDAOModels;
fIndexes : TDAOIndexes;
protected
property OwnsConnection : Boolean read fOwnsConnection write fOwnsConnection;
function CreateConnectionString : string; virtual; abstract;
procedure ExecuteSQLQuery(const aQueryText : string); virtual; abstract;
procedure OpenSQLQuery(const aQueryText: string); virtual; abstract;
function ExistsTable(aModel : TDAOModel) : Boolean; virtual; abstract;
function CreateTable(const aModel : TDAOModel): Boolean; virtual;
function ExistsColumn(aModel: TDAOModel; const aFieldName: string): Boolean; virtual; abstract;
procedure AddColumnToTable(aModel : TDAOModel; aField : TDAOField); virtual;
procedure CreateTables; virtual;
procedure SetPrimaryKey(aModel : TDAOModel); virtual;
procedure CreateIndexes; virtual;
procedure CreateIndex(aModel : TDAOModel; aIndex : TDAOIndex); virtual;
public
constructor Create; virtual;
destructor Destroy; override;
function QueryGenerator : IDAOQueryGenerator;
property Connection : TDBConnectionSettings read fDBConnection write fDBConnection;
property Models : TDAOModels read fModels write fModels;
property Indexes : TDAOIndexes read fIndexes write fIndexes;
function CreateQuery(aModel : TDAOModel) : IDAOQuery<TDAORecord>; virtual; abstract;
function GetTableNames : TArray<string>; virtual; abstract;
function GetFieldNames(const aTableName : string) : TArray<string>; virtual; abstract;
function Connect : Boolean; virtual;
procedure Disconnect; virtual; abstract;
function IsConnected : Boolean; virtual; abstract;
function AddOrUpdate(aDAORecord : TDAORecord) : Boolean; virtual;
function Add(aDAORecord : TDAORecord) : Boolean; virtual;
function Update(aDAORecord : TDAORecord) : Boolean; virtual;
function Delete(aDAORecord : TDAORecord) : Boolean; overload; virtual;
function Clone : TDAODatabase; virtual; abstract;
end;
implementation
{ TDAODataBase }
constructor TDAODataBase.Create;
begin
fDBConnection := TDBConnectionSettings.Create;
fOwnsConnection := True;
fModels := TDAOModels.Create;
fIndexes := TDAOIndexes.Create;
end;
destructor TDAODataBase.Destroy;
begin
fDBConnection.Free;
fModels.Free;
fIndexes.Free;
inherited;
end;
procedure TDAODataBase.CreateIndexes;
var
daoindex : TDAOIndex;
daomodel : TDAOModel;
begin
for daoindex in Indexes.List do
begin
if (Models.List.TryGetValue(daoindex.Table,daomodel)) and (daomodel.HasPrimaryKey) then CreateIndex(daomodel,daoindex);
end;
end;
procedure TDAODataBase.CreateTables;
var
daomodel : TDAOModel;
field : TDAOField;
begin
for daomodel in Models.List.Values do
begin
if not ExistsTable(daomodel) then CreateTable(daomodel)
else
begin
//add new fields
for field in daomodel.Fields do
begin
if not ExistsColumn(daomodel,field.Name) then AddColumnToTable(daomodel,field);
end;
end;
SetPrimaryKey(daomodel);
end;
end;
function TDAODataBase.CreateTable(const aModel : TDAOModel): Boolean;
begin
try
ExecuteSQLQuery(QueryGenerator.CreateTable(aModel));
Result := True;
except
on E : Exception do raise EDAOCreationError.CreateFmt('Error creating table "%s" : %s!',[aModel.TableName,e.Message])
end;
end;
function TDAODataBase.Connect: Boolean;
begin
Result := False;
fQueryGenerator := TDAOQueryGeneratorFactory.Create(fDBConnection.Provider);
end;
procedure TDAODataBase.AddColumnToTable(aModel : TDAOModel; aField : TDAOField);
begin
try
ExecuteSQLQuery(QueryGenerator.AddColumn(aModel,aField));
except
on E : Exception do raise EDAOCreationError.CreateFmt('Error creating table "%s" fields',[aModel.TableName]);
end;
end;
procedure TDAODataBase.SetPrimaryKey(aModel : TDAOModel);
var
query : string;
begin
try
query := QueryGenerator.SetPrimaryKey(aModel);
if not query.IsEmpty then ExecuteSQLQuery(query);
except
on E : Exception do raise EDAOCreationError.Create('Error modifying primary key field');
end;
if (fDBConnection.Provider = daoSQLite) and (aModel.HasPrimaryKey) then Indexes.Add(aModel.Table,[aModel.PrimaryKey.Name],TDAOIndexOrder.orAscending);
end;
procedure TDAODataBase.CreateIndex(aModel : TDAOModel; aIndex : TDAOIndex);
var
query : string;
begin
try
query := QueryGenerator.CreateIndex(aModel,aIndex);
if query.IsEmpty then Exit;
ExecuteSQLQuery(query);
except
on E : Exception do raise EDAOCreationError.CreateFmt('Error creating index "%s" on table "%s"',[aIndex.FieldNames[0],aModel.TableName]);
end;
end;
function TDAODataBase.Add(aDAORecord : TDAORecord) : Boolean;
begin
Result := CreateQuery(fModels.Get(aDAORecord)).Add(aDAORecord);
end;
function TDAODataBase.AddOrUpdate(aDAORecord : TDAORecord) : Boolean;
begin
Result := CreateQuery(fModels.Get(aDAORecord)).AddOrUpdate(aDAORecord);
end;
function TDAODataBase.Delete(aDAORecord : TDAORecord) : Boolean;
begin
Result := CreateQuery(fModels.Get(aDAORecord)).Delete(aDAORecord);
end;
function TDAODataBase.Update(aDAORecord : TDAORecord) : Boolean;
begin
Result := CreateQuery(fModels.Get(aDAORecord)).Update(aDAORecord);
end;
function TDAODataBase.QueryGenerator: IDAOQueryGenerator;
begin
Result := fQueryGenerator;
end;
{ TDBConnectionSettings }
function TDBConnectionSettings.Clone: TDBConnectionSettings;
begin
Result := TDBConnectionSettings.Create;
Result.Provider := fDBProvider;
Result.Server := fServer;
Result.Database := fDatabase;
Result.UserName := fUserName;
Result.Password := fPassword;
Result.fIsCustomConnectionString := fIsCustomConnectionString;
Result.fCustomConnectionString := fCustomConnectionString;
end;
constructor TDBConnectionSettings.Create;
begin
fCustomConnectionString := '';
fIsCustomConnectionString := False;
end;
procedure TDBConnectionSettings.FromConnectionString(aDBProviderID : Integer; const aConnectionString: string);
begin
if aConnectionString.IsEmpty then fIsCustomConnectionString := False
else
begin
fCustomConnectionString := aConnectionString;
fIsCustomConnectionString := True;
end;
//get provider from connectionstring
if aDBProviderID <> 0 then fDBProvider := TDBProvider(aDBProviderID)
else
begin
if fCustomConnectionString.ToUpper.Contains('DRIVERID=SQLITE') then fDBProvider := TDBProvider.daoSQLite;
end;
end;
function TDBConnectionSettings.GetCustomConnectionString: string;
begin
Result := fCustomConnectionString;
end;
function TDBConnectionSettings.GetDatabase: string;
begin
Result := fDatabase;
end;
function TDBConnectionSettings.GetProvider: TDBProvider;
begin
Result := fDBProvider;
end;
function TDBConnectionSettings.GetServer: string;
begin
Result := fServer;
end;
function TDBConnectionSettings.GetUserName: string;
begin
Result := fUserName;
end;
function TDBConnectionSettings.IsCustomConnectionString: Boolean;
begin
Result := fIsCustomConnectionString;
end;
function TDBConnectionSettings.GetPassword: string;
begin
Result := fPassword;
end;
end.