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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit Sql.Subquery;
interface
uses
Sql.Expression,
Sql.Statement.ResultSet,
Type_;
type
TSqlExists = class(TSqlExpression)
private
FSubquery: TSqlResultSetStatement;
procedure SetSubquery(const Value: TSqlResultSetStatement);
public
constructor Create(Subquery: TSqlResultSetStatement); reintroduce; virtual;
destructor Destroy(); override;
function Copy(): TSqlExpression; override;
function CopyExists(): TSqlExists;
function GetType(): TType; override;
property Subquery: TSqlResultSetStatement read FSubquery write SetSubquery;
end;
TSqlInSubquery = class(TSqlExpression)
private
FSubquery: TSqlResultSetStatement;
FValue: TSqlExpression;
procedure SetSubquery(const Value: TSqlResultSetStatement);
procedure SetValue(const Value: TSqlExpression);
public
constructor Create(Value: TSqlExpression; Subquery: TSqlResultSetStatement); reintroduce; virtual;
destructor Destroy(); override;
function GetType(): TType; override;
function Copy(): TSqlExpression; override;
function CopyInSubquery(): TSqlInSubquery;
property Value: TSqlExpression read FValue write SetValue;
property Subquery: TSqlResultSetStatement read FSubquery write SetSubquery;
end;
implementation
uses
Boolean.Type_;
{ TSqlInSubquery }
function TSqlInSubquery.Copy(): TSqlExpression;
begin
Result := CopyInSubquery();
end;
function TSqlInSubquery.CopyInSubquery(): TSqlInSubquery;
begin
Result := TSqlInSubquery.Create(Value.Copy(), Subquery.CopyResultSetStatement());
end;
constructor TSqlInSubquery.Create(Value: TSqlExpression; Subquery: TSqlResultSetStatement);
begin
inherited Create;
FValue := Value;
FSubquery := Subquery;
Value.AddReference();
Subquery.AddReference();
end;
destructor TSqlInSubquery.Destroy();
begin
Value.ReleaseReference();
Subquery.ReleaseReference();
inherited Destroy();
end;
function TSqlInSubquery.GetType(): TType;
begin
Result := TBooleanType.Boolean;
end;
procedure TSqlInSubquery.SetSubquery(const Value: TSqlResultSetStatement);
begin
if Value <> Subquery then
begin
Value.AddReference();
Subquery.ReleaseReference();
FSubquery := Value;
end;
end;
procedure TSqlInSubquery.SetValue(const Value: TSqlExpression);
begin
if Value <> Self.Value then
begin
Value.AddReference();
Self.Value.ReleaseReference();
FValue := Value;
end;
end;
{ TSqlExists }
function TSqlExists.Copy(): TSqlExpression;
begin
Result := CopyExists();
end;
function TSqlExists.CopyExists(): TSqlExists;
begin
Result := TSqlExists.Create(Subquery.CopyResultSetStatement());
end;
constructor TSqlExists.Create(Subquery: TSqlResultSetStatement);
begin
inherited Create();
Self.Subquery := Subquery;
end;
destructor TSqlExists.Destroy();
begin
Subquery.ReleaseReference();
inherited Destroy();
end;
function TSqlExists.GetType(): TType;
begin
Result := TBooleanType.Boolean;
end;
procedure TSqlExists.SetSubquery(const Value: TSqlResultSetStatement);
begin
if Value <> Subquery then
begin
Value.AddReference();
Subquery.ReleaseReference();
FSubquery := Value;
end;
end;
end.
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