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Quick.DAO.QueryGenerator.MSAccess.pas
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Quick.DAO.QueryGenerator.MSAccess.pas
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{ ***************************************************************************
Copyright (c) 2016-2020 Kike Pérez
Unit : Quick.DAO.QueryGenerator.MSAccess
Description : DAO MSAccess Query Generator
Author : Kike Pérez
Version : 1.0
Created : 22/06/2018
Modified : 31/03/2020
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.QueryGenerator.MSAccess;
interface
{$i QuickDAO.inc}
uses
Classes,
SysUtils,
Quick.Commons,
Quick.DAO;
type
TMSAccessQueryGenerator = class(TDAOQueryGenerator,IDAOQueryGenerator)
public
function Name : string;
function CreateTable(const aTable : TDAOModel) : string;
function ExistsTable(aModel : TDAOModel) : string;
function ExistsColumn(aModel : TDAOModel; const aFieldName : string) : string;
function AddColumn(aModel : TDAOModel; aField : TDAOField) : string;
function SetPrimaryKey(aModel : TDAOModel) : string;
function CreateIndex(aModel : TDAOModel; aIndex : TDAOIndex) : string;
function Select(const aTableName, aFieldNames : string; aLimit : Integer; const aWhere : string; aOrderFields : string; aOrderAsc : Boolean) : string;
function Sum(const aTableName, aFieldName, aWhere: string): string;
function Count(const aTableName : string; const aWhere : string) : string;
function Add(const aTableName: string; const aFieldNames, aFieldValues : string) : string;
function AddOrUpdate(const aTableName: string; const aFieldNames, aFieldValues : string) : string;
function Update(const aTableName, aFieldPairs, aWhere : string) : string;
function Delete(const aTableName : string; const aWhere : string) : string;
function DateTimeToDBField(aDateTime : TDateTime) : string;
function DBFieldToDateTime(const aValue : string) : TDateTime;
end;
implementation
const
{$IFNDEF FPC}
DBDATATYPES : array of string = ['text(%d)','text','char(%d)','int','integer','bigint','decimal(%d,%d)','bit','date','time','datetime','datetime','datetime'];
{$ELSE}
DBDATATYPES : array[0..10] of string = ('text(%d)','text','char(%d)','int','integer','bigint','decimal(%d,%d)','bit','date','time','datetime','datetime','datetime');
{$ENDIF}
{ TMSSQLQueryGenerator }
function TMSAccessQueryGenerator.Add(const aTableName, aFieldNames, aFieldValues: string): string;
var
querytext : TStringList;
begin
querytext := TStringList.Create;
try
querytext.Add(Format('INSERT INTO [%s]',[aTableName]));
querytext.Add(Format('(%s)',[aFieldNames]));
querytext.Add(Format('VALUES(%s)',[aFieldValues]));
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.AddColumn(aModel: TDAOModel; aField: TDAOField) : string;
var
datatype : string;
querytext : TStringList;
begin
querytext := TStringList.Create;
try
querytext.Add(Format('ALTER TABLE [%s]',[aModel.TableName]));
if aField.DataType = dtFloat then
begin
datatype := Format(DBDATATYPES[Integer(aField.DataType)],[aField.DataSize,aField.Precision])
end
else
begin
if aField.DataSize > 0 then datatype := Format(DBDATATYPES[Integer(aField.DataType)],[aField.DataSize])
else datatype := DBDATATYPES[Integer(aField.DataType)];
end;
querytext.Add(Format('ADD [%s] %s',[aField.Name,datatype]));
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.CreateIndex(aModel: TDAOModel; aIndex: TDAOIndex) : string;
var
querytext : TStringList;
begin
Exit;
querytext := TStringList.Create;
try
querytext.Add(Format('IF NOT EXISTS(SELECT * FROM sys.indexes WHERE name = ''PK_%s'' AND object_id = OBJECT_ID(''%s''))',[aIndex.FieldNames[0],aModel.TableName]));
querytext.Add('BEGIN');
querytext.Add(Format('CREATE INDEX PK_%s ON [%s] (%s);',[aIndex.FieldNames[0],aModel.TableName,aIndex.FieldNames[0]]));
querytext.Add('END');
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.CreateTable(const aTable: TDAOModel) : string;
var
field : TDAOField;
datatype : string;
querytext : TStringList;
begin
querytext := TStringList.Create;
try
//querytext.Add(Format('IF NOT EXISTS (SELECT Count(MSysObjects.Id) AS CountOfId FROM MSysObjects WHERE MSysObjects.Type IN (1,4,6) AND MSysObjects.name = ''%s'')',[aTable.TableName]));
//querytext.Add('BEGIN');
querytext.Add(Format('CREATE TABLE [%s] (',[aTable.TableName]));
for field in aTable.Fields do
begin
if field.DataType = dtFloat then
begin
datatype := Format(DBDATATYPES[Integer(field.DataType)],[field.DataSize,field.Precision])
end
else
begin
if field.DataSize > 0 then datatype := Format(DBDATATYPES[Integer(field.DataType)],[field.DataSize])
else datatype := DBDATATYPES[Integer(field.DataType)];
end;
if field.DataType = dtAutoID then querytext.Add(Format('[%s] %s IDENTITY(1,1),',[field.Name,datatype]))
else querytext.Add(Format('[%s] %s,',[field.Name,datatype]))
end;
if not aTable.PrimaryKey.Name.IsEmpty then
begin
querytext.Add(Format('PRIMARY KEY(%s)',[aTable.PrimaryKey.Name]));
end
else querytext[querytext.Count-1] := Copy(querytext[querytext.Count-1],1,querytext[querytext.Count-1].Length-1);
//querytext.Add('END');
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.ExistsColumn(aModel: TDAOModel; const aFieldName: string) : string;
var
querytext : TStringList;
begin
querytext := TStringList.Create;
try
querytext.Add('SELECT Name FROM sys.columns');
querytext.Add(Format('WHERE object_id = OBJECT_ID(''%s'')',[aModel.TableName]));
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.ExistsTable(aModel: TDAOModel): string;
var
querytext : TStringList;
begin
querytext := TStringList.Create;
try
querytext.Add('GRANT SELECT ON MSysObjects TO Admin;');
//querytext.Add(Format('SELECT name FROM MSysObjects WHERE MSysObjects.Type IN (1,4,6) AND MSysObjects.name = ''%s''',[aModel.TableName]));
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.Name: string;
begin
Result := 'MSACCESS';
end;
function TMSAccessQueryGenerator.SetPrimaryKey(aModel: TDAOModel) : string;
var
querytext : TStringList;
begin
querytext := TStringList.Create;
try
//querytext.Add('IF NOT EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS');
//querytext.Add(Format('WHERE CONSTRAINT_TYPE = ''PRIMARY KEY'' AND TABLE_NAME = ''%s'' AND TABLE_SCHEMA =''dbo'')',[aModel.TableName]));
//querytext.Add('BEGIN');
//querytext.Add(Format('ALTER TABLE [%s] ADD CONSTRAINT PK_%s PRIMARY KEY (%s)',[aModel.TableName,aModel.PrimaryKey,aModel.PrimaryKey]));
//querytext.Add('END');
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.Sum(const aTableName, aFieldName, aWhere: string): string;
var
querytext : TStringList;
begin
querytext := TStringList.Create;
try
querytext.Add(Format('SELECT SUM (%s) FROM [%s] WHERE %s',[aTableName,aFieldName,aWhere]));
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.Select(const aTableName, aFieldNames: string; aLimit: Integer;
const aWhere: string; aOrderFields: string; aOrderAsc: Boolean) : string;
var
orderdir : string;
querytext : TStringList;
toplimit : string;
begin
querytext := TStringList.Create;
try
//define limited query clause
if aLimit > 0 then toplimit := Format('TOP %d ',[aLimit])
else toplimit := '';
//define select-where clauses
if aFieldNames.IsEmpty then querytext.Add(Format('SELECT %s* FROM [%s] WHERE %s',[toplimit,aTableName,aWhere]))
else querytext.Add(Format('SELECT %s%s FROM [%s] WHERE %s',[toplimit,aFieldNames,aTableName,aWhere]));
//define orderby clause
if not aOrderFields.IsEmpty then
begin
if aOrderAsc then orderdir := 'ASC'
else orderdir := 'DESC';
querytext.Add(Format('ORDER BY %s %s',[aOrderFields,orderdir]));
end;
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.AddOrUpdate(const aTableName: string; const aFieldNames, aFieldValues : string) : string;
var
querytext : TStringList;
begin
querytext := TStringList.Create;
try
querytext.Add(Format('INSERT OR REPLACE INTO [%s]',[aTableName]));
querytext.Add(Format('(%s)',[aFieldNames]));
querytext.Add(Format('VALUES(%s)',[aFieldValues]));
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.Update(const aTableName, aFieldPairs, aWhere : string) : string;
var
querytext : TStringList;
begin
querytext := TStringList.Create;
try
querytext.Add(Format('UPDATE [%s]',[aTableName]));
querytext.Add(Format('SET %s',[aFieldPairs]));
querytext.Add(Format('WHERE %s',[aWhere]));
Result := querytext.Text;
finally
querytext.Free;
end;
end;
function TMSAccessQueryGenerator.Count(const aTableName : string; const aWhere : string) : string;
begin
Result := Format('SELECT COUNT(*) AS cnt FROM [%s] WHERE %s',[aTableName,aWhere]);
end;
function TMSAccessQueryGenerator.DateTimeToDBField(aDateTime: TDateTime): string;
begin
Result := FormatDateTime('YYYY/MM/DD hh:nn:ss',aDateTime);
end;
function TMSAccessQueryGenerator.DBFieldToDateTime(const aValue: string): TDateTime;
begin
Result := StrToDateTime(aValue);
end;
function TMSAccessQueryGenerator.Delete(const aTableName, aWhere: string) : string;
begin
Result := Format('SELECT COUNT(*) AS cnt FROM [%s] WHERE %s',[aTableName,aWhere]);
end;
end.