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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.Database.Logical.Branching.BranchSet.Manager;
interface
uses
Boolean,
Collection,
Collection.List,
Exception,
Integer,
Sql.Builder,
Sql.Database,
Sql.Database.Logical.Branching.BranchSet,
Sql.Database.Logical.Branching.Table,
Sql.View.Subquery,
Text;
type
{
Currently sometimes this code returns "Empty" BranchSets (e.g. they will have an ID but no actual branches. Check
code when relying on branches.
}
TBranchSetManager = class(TObject)
private
BranchSetTable: TBranchSetTable;
Database: TSqlDatabase;
procedure DeleteDatabaseBranchSetBranchID(const BranchID: TInteger; BranchSet: TBranchSet);
procedure DeleteDatabaseBranchSet(BranchSet: TBranchSet);
protected
function GetBranchSetsContainingBranches(BranchIds: TCollection<TInteger>): TList<TBranchSet>; virtual;
function GetBranchSetWithExactBranches(const BranchIDs: array of TInteger): TBranchSet;
procedure StoreBranchSet(BranchSet: TBranchSet);
public
constructor Create(Database: TSqlDatabase; BranchSetTable: TBranchSetTable);
function GetBranchSetsContainingBranchSet(BranchSet: TBranchSet): TList<TBranchSet>; virtual;
function GetBranchSetWithId(const BranchSetID: TInteger): TBranchSet;
function GetMergedBranchSet(BranchSet1: TBranchSet; BranchSet2: TBranchSet): TBranchSet;
function GetSubsets(BranchSet: TBranchSet): TList<TBranchSet>;
function SubtractBranchSet(BranchSet1: TBranchSet; BranchSet2: TBranchSet): TBranchSet;
function GetOrCreateBranchSetWithBranches(const BranchIDs: array of TInteger): TBranchSet; virtual;
function DeleteBranchFromBranchSet(const BranchID: TInteger; BranchSet: TBranchSet): TInteger; virtual;
function GetBranchSetsContainingAtMostAllButOneBranches(const BranchIDs: array of TInteger): TList<TBranchSet>;
procedure AddBranchToAllBranchSetsContainingBranch(const BranchToAdd: TInteger; const ContainingBranch: TInteger);
end;
TBranchSetMatchingCountView = class(TSqlSubqueryView)
public
Id: TSqlTableColumnBuilder;
Count: TSqlTableColumnBuilder;
constructor Create(BranchSetTable: TBranchSetTable; const BranchIds: array of TInteger; ViewName: TText; InSet: TBoolean); reintroduce; virtual;
end;
EInvalidBranchIdException = class(EException);
implementation
uses
Collection.List.Array_,
Integer._32,
Object_.List,
Sql,
Sql.Result;
{ TBranchSetManager }
procedure TBranchSetManager.AddBranchToAllBranchSetsContainingBranch(const BranchToAdd: TInteger; const ContainingBranch: TInteger);
var
Result: TSqlResult;
begin
Result := Database.Query(
InsertSelect(
BranchSetTable,
[
BranchSetTable.Id,
BranchSetTable.BranchID
],
Select(
[
BranchSetTable.Id,
BranchToAdd
],
[ BranchSetTable ],
[ BranchSetTable.BranchID = ContainingBranch ]
)
)
);
Result.Free();
end;
constructor TBranchSetManager.Create(Database: TSqlDatabase; BranchSetTable: TBranchSetTable);
begin
inherited Create();
Self.BranchSetTable := BranchSetTable;
Self.Database := Database;
end;
function TBranchSetManager.DeleteBranchFromBranchSet(const BranchID: TInteger; BranchSet: TBranchSet): TInteger;
var
OtherBranchIDs: TArray<TInteger>;
i: TInteger32;
Index: TInteger32;
NewBranchSet: TBranchSet;
begin
if BranchSet.Branches.Count = 1 then
begin
if BranchSet.Branches[0].Id <> BranchID then
raise EInvalidBranchIdException.Create('DeleteBranchFromBranchSet called with BranchID not in BranchSet');
DeleteDatabaseBranchSet(BranchSet);
Result := -1;
end
else
begin
SetLength(OtherBranchIDs, BranchSet.Branches.Count - 1);
Index := 0;
for i := 0 to BranchSet.Branches.Count - 1 do
begin
if BranchSet.Branches[i].Id <> BranchID then
begin
OtherBranchIDs[Index] := BranchSet.Branches[i].Id;
Inc(Index);
end;
end;
if (Index <> (BranchSet.Branches.Count - 1)) then
raise EInvalidBranchIdException.Create(
'Branch with ID '
+ BranchID.ToText()
+ ' not found in branch set with id '
+ BranchSet.Id.ToText()
);
NewBranchSet := GetBranchSetWithExactBranches(OtherBranchIDs);
if NewBranchSet <> nil then
begin
Result := NewBranchSet.Id;
DeleteDatabaseBranchSet(BranchSet);
NewBranchSet.Free();
end
else
begin
DeleteDatabaseBranchSetBranchID(BranchID, BranchSet);
Result := BranchSet.Id;
end;
end;
end;
procedure TBranchSetManager.DeleteDatabaseBranchSet(BranchSet: TBranchSet);
begin
Database.Query(Delete([BranchSetTable], [BranchSetTable.Id = BranchSet.Id]));
end;
procedure TBranchSetManager.DeleteDatabaseBranchSetBranchID(const BranchID: TInteger; BranchSet: TBranchSet);
begin
Database.Query(Delete([BranchSetTable], [BranchSetTable.Id = BranchSet.Id, BranchSetTable.BranchID = BranchID]));
end;
function TBranchSetManager.GetBranchSetsContainingAtMostAllButOneBranches(const BranchIDs: array of TInteger): TList<TBranchSet>;
var
SqlResult: TSqlResult;
MatchingCount: TBranchSetMatchingCountView;
begin
MatchingCount := TBranchSetMatchingCountView.Create(BranchSetTable, BranchIDs, 'MatchingCount', True);
SqlResult := Database.Query(
Select(
[ MatchingCount.Id ],
[ MatchingCount ],
[
MatchingCount.Count > 0,
MatchingCount.Count < System.Length(BranchIDs)
]
)
);
Result := TObjectList<TBranchSet>.Create();
while SqlResult.FetchRow() do
Result.Add(GetBranchSetWithId(SqlResult.ReadInteger()));
SqlResult.Free();
MatchingCount.Free();
end;
function TBranchSetManager.GetBranchSetsContainingBranches(BranchIds: TCollection<TInteger>): TList<TBranchSet>;
var
SqlResult: TSqlResult;
Subquery: TBranchSetMatchingCountView;
begin
Subquery := TBranchSetMatchingCountView.Create(BranchSetTable, BranchIDs.ToArray(), 'BranchMatchCounts', True);
SqlResult := Database.Query(
Select(
[ Subquery.Id ],
[ Subquery ],
[ Subquery.Count >= BranchIds.Count ]
)
);
Result := TObjectList<TBranchSet>.Create();
while SqlResult.FetchRow() do
Result.Add(GetBranchSetWithId(SqlResult.ReadInteger()));
Subquery.Free();
SqlResult.Free();
end;
function TBranchSetManager.GetBranchSetsContainingBranchSet(BranchSet: TBranchSet): TList<TBranchSet>;
var
BranchIds: TList<TInteger>;
Branch: TBranch;
begin
BranchIds := TArrayList<TInteger>.Create();
for Branch in BranchSet.Branches do
BranchIds.Add(Branch.Id);
Result := GetBranchSetsContainingBranches(BranchIDs);
BranchIds.Free();
end;
function TBranchSetManager.GetBranchSetWithId(const BranchSetID: TInteger): TBranchSet;
var
SqlResult: TSqlResult;
begin
SqlResult := Database.Query(
Select(
[ BranchSetTable.BranchID ],
[ BranchSetTable ],
[ BranchSetTable.Id = BranchSetID ]
)
);
Result := TBranchSet.Create(BranchSetID);
while SqlResult.FetchRow() do
Result.Branches.Add(TBranch.Create(SqlResult.ReadInteger()));
SqlResult.Free();
end;
function TBranchSetManager.GetMergedBranchSet(BranchSet1, BranchSet2: TBranchSet): TBranchSet;
var
MergedBranchIDs: TArray<TInteger>;
FinalMergedBranchIDs: TArray<TInteger>;
SetSize: TInteger32;
i: TInteger32;
j: TInteger32;
begin
SetLength(MergedBranchIDs, BranchSet1.Branches.Count + BranchSet2.Branches.Count);
SetSize := 0;
// Merge the two sets without duplicates (assumption: there are no dups in the individual sets
for i := 0 to BranchSet1.Branches.Count - 1 do
begin
MergedBranchIDs[SetSize] := BranchSet1.Branches[i].Id;
Inc(SetSize);
end;
for i := 0 to BranchSet2.Branches.Count - 1 do
begin
j := 0;
while (MergedBranchIDs[j] <> BranchSet2.Branches[i].Id) and (j < BranchSet1.Branches.Count) do
Inc(j);
if j = BranchSet1.Branches.Count then
begin
MergedBranchIDs[SetSize] := BranchSet2.Branches[i].Id;
Inc(SetSize);
end;
end;
SetLength(FinalMergedBranchIDs, SetSize);
for i := 0 to SetSize - 1 do
FinalMergedBranchIDs[i] := MergedBranchIDs[i];
Result := GetOrCreateBranchSetWithBranches(FinalMergedBranchIDs);
end;
function TBranchSetManager.GetSubsets(BranchSet: TBranchSet): TList<TBranchSet>;
var
NonMatchingCount: TBranchSetMatchingCountView;
BranchSetsTable: TBranchSetTable;
BranchIDs: TArray<TInteger>;
SqlResult: TSqlResult;
i: TInteger32;
begin
Result := TObjectList<TBranchSet>.Create();
BranchSetsTable := BranchSetTable.AliasTable('AllBranchSets');
SetLength(BranchIDs, BranchSet.Branches.Count);
for i := 0 to BranchSet.Branches.Count - 1 do
BranchIDs[i] := BranchSet.Branches[i].Id;
NonMatchingCount := TBranchSetMatchingCountView.Create(BranchSetTable, BranchIDs, 'NonMatching', False);
SqlResult := Database.Query(
Select(
[ BranchSetsTable.Id ],
[ LeftJoin(BranchSetsTable, NonMatchingCount, [ BranchSetsTable.Id = NonMatchingCount.Id ]) ],
[ OrAll( [ NonMatchingCount.Count = 0, NonMatchingCount.Count.IsNull ]) ]
)
);
while SqlResult.FetchRow() do
Result.Add(TBranchSet.Create(SqlResult.ReadInteger()));
SqlResult.Free();
NonMatchingCount.Free();
BranchSetsTable.Free();
end;
{
Inserts the specified BranchSet into the database and assigns a new branchset id to it.
}
procedure TBranchSetManager.StoreBranchSet(BranchSet: TBranchSet);
var
SqlResult: TSqlResult;
i: TInteger32;
begin
SqlResult := Database.QuerySingleRow(Select( [ Sql.Maximum(BranchSetTable.Id) + 1 ], [BranchSetTable], []));
if SqlResult.ReadNull() then
BranchSet.Id := 1
else
BranchSet.Id := SqlResult.ReadInteger();
SqlResult.Free();
for i := 0 to BranchSet.Branches.Count - 1 do
Database.Query(InsertValues(BranchSetTable, [ BranchSetTable.Id, BranchSetTable.BranchID ], [BranchSet.Id, BranchSet.Branches[i].Id ]));
end;
function TBranchSetManager.SubtractBranchSet(BranchSet1: TBranchSet; BranchSet2: TBranchSet): TBranchSet;
var
BranchIDs: TArray<TInteger>;
FinalBranchIDs: TArray<TInteger>;
BranchCount: TInteger32;
i: TInteger32;
j: TInteger32;
begin
SetLength(BranchIDs, BranchSet1.Branches.Count);
BranchCount := 0;
for i := 0 to BranchSet1.Branches.Count - 1 do
begin
j := 0;
while (j < BranchSet2.Branches.Count) and (BranchSet2.Branches[j].Id <> BranchSet1.Branches[i].Id) do
Inc(j);
if j = BranchSet2.Branches.Count then
begin
BranchIDs[BranchCount] := BranchSet1.Branches[i].Id;
Inc(BranchCount);
end;
end;
SetLength(FinalBranchIDs, BranchCount);
for i := 0 to BranchCount - 1 do
FinalBranchIDs[i] := BranchIDs[i];
Result := GetOrCreateBranchSetWithBranches(FinalBranchIDs);
end;
function TBranchSetManager.GetOrCreateBranchSetWithBranches(const BranchIDs: array of TInteger): TBranchSet;
var
i: TInteger32;
begin
Result := GetBranchSetWithExactBranches(BranchIDs);
if Result = nil then
begin
Result := TBranchSet.Create(0);
for i := 0 to System.Length(BranchIDs) - 1 do
Result.Branches.Add(TBranch.Create(BranchIDs[i]));
StoreBranchSet(Result);
end;
end;
function TBranchSetManager.GetBranchSetWithExactBranches(const BranchIDs: array of TInteger): TBranchSet;
var
SqlResult: TSqlResult;
MatchingCount: TBranchSetMatchingCountView;
NonMatchingCount: TBranchSetMatchingCountView;
i: TInteger32;
begin
MatchingCount := TBranchSetMatchingCountView.Create(BranchSetTable, BranchIDs, 'MatchingCount', True);
NonMatchingCount := TBranchSetMatchingCountView.Create(BranchSetTable, BranchIDs, 'NonMatchingCount', False);
SqlResult := Database.Query(
Select(
[ MatchingCount.Id ],
[
LeftJoin(MatchingCount, NonMatchingCount, [ MatchingCount.Id = NonMatchingCount.Id ])
],
[
MatchingCount.Count = System.Length(BranchIDs),
OrAll([ NonMatchingCount.Count = 0, NonMatchingCount.Count.IsNull ])
]
)
);
if SqlResult.GetRowCount() = 0 then
Result := nil
else if SqlResult.GetRowCount() > 1 then
raise EException.Create('Multiple branchsets marching.')
else
begin
SqlResult.FetchRow();
Result := TBranchSet.Create(SqlResult.ReadInteger());
for i := 0 to System.Length(BranchIDs) - 1 do
Result.Branches.Add(TBranch.Create(BranchIDs[i]));
end;
MatchingCount.Free();
NonMatchingCount.Free();
SqlResult.Free();
end;
{ TBranchSetNestedView }
constructor TBranchSetMatchingCountView.Create(BranchSetTable: TBranchSetTable; const BranchIds: array of TInteger; ViewName: TText; InSet: TBoolean);
var
InSetExpression: TSqlExpressionBuilder;
begin
InSetExpression := Sql.InSet(BranchSetTable.BranchID, IntegerSet(BranchIds));
if not InSet then
InSetExpression := not InSetExpression;
inherited Create(
ViewName,
SelectGrouped(
[ BranchSetTable.Id, Alias('Count', nil, Sql.Count) ],
[ BranchSetTable ],
[ InSetExpression ],
[ BranchSetTable.Id ]
)
);
Id := Columns[0];
Count := Columns[1];
end;
end.
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