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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;
interface
uses
Boolean,
Collection.List,
Exception,
Integer,
Sql.Builder,
Sql.Database,
Sql.Database.Logical.Annotating,
Sql.Database.Logical.Branching.BranchSet,
Sql.Database.Logical.Branching.BranchSet.Manager,
Sql.Database.Logical.UpdateOperation,
Sql.Expression,
Sql.Functions.FlowControl,
Sql.Result,
Sql.Statement,
Sql.Statement.DataDefinition.Table.Create,
Sql.Statement.DataManipulation,
Sql.Table,
Sql.Table.Column,
Text;
type
TSqlBranchingUpdateOperation = class(TLogicalSqlUpdateOperation)
protected
BranchSetManager: TBranchSetManager;
BranchSet: TBranchSet;
function IsManagedColumn(Column: TSqlTableColumn): TBoolean; override;
public
constructor Create(Database: TSqlDatabase; const TemporaryIdentifier: TText; Table: TSqlTable; Columns: TList<TSqlTableColumn>; BranchSetManager: TBranchSetManager; BranchSet: TBranchSet); reintroduce; virtual;
procedure AddManagingColumns(InsertSelect: TSqlInsertSelect); override;
function CreatePresentRestriction(): TSqlExpression; override;
end;
TBranchingSqlDatabase = class(TAnnotatingSqlDatabase)
private
FCurrentBranchSet: TBranchSet;
FBranchedTables: TList<TSqlTable>;
private
BranchSetManager: TBranchSetManager;
function CreateInSubSetExpression(Column: TSqlTableColumnBuilder): TSqlExpressionBuilder;
function CreateInBranchSetSet(BranchSetSubsets: TList<TBranchSet>; Column: TSqlTableColumnBuilder): TSqlExpressionBuilder;
procedure UpdateBranchedTablesAfterBranchDelete(const OldId: TInteger; const NewId: TInteger);
procedure DeleteBranchedTableRowsAfterBranchDelete(const OldId: TInteger);
function GenerateCaseStatement(UpdateOperation: TLogicalSqlUpdateOperation): TSqlCase;
function GenerateCaseStatementForBranchIdConversion(const From: array of TInteger; const ToValues: array of TInteger; CaseColumn: TSqlTableColumnBuilder): TSqlCase;
protected
procedure StartUpdateOperation(Table: TSqlTable); override;
procedure AddDeleteRestrictions(Delete: TSqlDelete; Table: TSqlTable); override;
procedure AddDeleteAssignments(Update: TSqlUpdate; Table: TSqlTable); override;
procedure AddManagingRestrictions(Expression: TSqlExpression); override;
procedure UpdateManagingColumns(UpdateOperation: TLogicalSqlUpdateOperation); override;
function IsManaged(Table: TSqlTable): TBoolean; overload; override;
function IsManaged(Table: TSqlTable; Column: TSqlTableColumn): TBoolean; overload; override;
function CreateUpdateOperation(Table: TSqlTable; Columns: TList<TSqlTableColumn>): TLogicalSqlUpdateOperation; override;
procedure HandleCreateTable(Statement: TSqlCreateTable);
public
constructor Create(CurrentBranchSet: TBranchSet; BranchSetManager: TBranchSetManager; Database: TSqlDatabase; OwnsDecoratedDatabase: TBoolean = False); reintroduce;
destructor Destroy(); override;
function Query(Statement: TSqlStatement; ResultMethod: TSqlQueryResultMethod = sqrmStoreResult): TSqlResult; override;
procedure DeleteBranch(const BranchId: TInteger);
procedure InitializeBranchedBasedOnExistingBranch(const NewBranch: TInteger; const ExistingBranch: TInteger);
property BranchedTables: TList<TSqlTable> read FBranchedTables;
property CurrentBranchSet: TBranchSet read FCurrentBranchSet;
end;
EBranchingDatabaseMissingColumnsInInsertException = class(EException)
public
constructor Create(Table: TSqlTable; ColumnList: TList<TSqlTableColumn>); reintroduce; virtual;
end;
EBranchingDatabaseUnsupportedOperation = class(EException);
EBranchingDatabaseBranchSetLocked = class(EException);
implementation
uses
Integer._32,
Integer._32.TextFormat,
Object_.List,
Reference.User,
Sql,
Sql.Comparison,
Sql.Database.Logical.Branching.RewriteRule,
Sql.Literal,
Sql.Rewriter,
Sql.Rewriter.Rule,
Sql.Statement.ResultSet,
Sql.Statement.ResultSet.Select,
Sql.Table.Expression;
{ TBranchingSqlDatabase }
procedure TBranchingSqlDatabase.AddDeleteAssignments(Update: TSqlUpdate; Table: TSqlTable);
var
i: TInteger32;
Case_: TSqlCase;
NewBranchSet: TBranchSet;
PreviousBranchSet: TBranchSet;
NewBranchSetIds: TArray<TInteger>;
PreviousBranchSetIds: TArray<TInteger>;
SqlResult: TSqlResult;
Select: TSqlSelect;
UpdateTable: TSqlTableExpression;
begin
Select := SelectDistinct([Table.BranchSet.BranchSetId], [Table], []);
Select.Restrictions.AddAll(Update.Restrictions);
if Update.Tables <> nil then
for UpdateTable in Update.Tables do
if UpdateTable.GetIdentifier() <> Table.Identifier then
Select.From.Add(UpdateTable);
SqlResult := Database.Query(Select);
if SqlResult.GetRowCount() > 0 then
begin
SetLength(PreviousBranchSetIds, SqlResult.GetRowCount());
SetLength(NewBranchSetIds, SqlResult.GetRowCount());
i := 0;
while SqlResult.FetchRow() do
begin
PreviousBranchSetIds[i] := SqlResult.ReadInteger();
PreviousBranchSet := BranchSetManager.GetBranchSetWithId(PreviousBranchSetIds[i]);
NewBranchSet := BranchSetManager.SubtractBranchSet(PreviousBranchSet, CurrentBranchSet);
PreviousBranchSet.Free();
NewBranchSetIds[i] := NewBranchSet.Id;
NewBranchSet.Free();
Inc(i);
end;
Case_ := GenerateCaseStatementForBranchIdConversion(PreviousBranchSetIds, NewBranchSetIds, Table.BranchSet.BranchSetId);
Update.Assignments.Add(Assign(Table.BranchSet.BranchSetId, Case_));
end;
SqlResult.Free();
end;
procedure TBranchingSqlDatabase.AddDeleteRestrictions(Delete: TSqlDelete; Table: TSqlTable);
begin
Delete.Restrictions.Add(CreateInSubSetExpression(Table.BranchSet.BranchSetId));
end;
procedure TBranchingSqlDatabase.AddManagingRestrictions(Expression: TSqlExpression);
var
RewriteRule: TSqlRewriteRule;
Rewriter: TSqlRewriter;
begin
RewriteRule := TBranchingSqlRewriteRule.Create(BranchSetManager, CurrentBranchSet);
Rewriter := TSqlRewriter.Create(RewriteRule);
Rewriter.DecorateExpression(Expression);
Rewriter.Free();
RewriteRule.Free();
end;
constructor TBranchingSqlDatabase.Create(CurrentBranchSet: TBranchSet; BranchSetManager: TBranchSetManager; Database: TSqlDatabase; OwnsDecoratedDatabase: TBoolean);
begin
inherited Create(Database, OwnsDecoratedDatabase);
Self.BranchSetManager := BranchSetManager;
FCurrentBranchSet := CurrentBranchSet;
FBranchedTables := TObjectList<TSqlTable>.Create();
FBranchedTables.ElementManager := TReferenceUser<TSqlTable>.Create();
end;
// This procedure requires that the BranchedTables property is properly filled. If this is not the case, the database
// will become corrupted, since the branchsets rows belong to may not be correctly updated.
procedure TBranchingSqlDatabase.DeleteBranch(const BranchId: TInteger);
var
BranchSets: TList<TBranchSet>;
BranchSet: TBranchSet;
OldId: TInteger;
NewId: TInteger;
i: TInteger32;
begin
BranchSet := BranchSetManager.GetOrCreateBranchSetWithBranches([BranchId]);
BranchSets := BranchSetManager.GetBranchSetsContainingBranchSet(BranchSet);
for i := 0 to BranchSets.Count - 1 do
begin
OldId := BranchSets[i].Id;
NewId := BranchSetManager.DeleteBranchFromBranchSet(BranchId, BranchSets[i]);
if NewId = -1 then
DeleteBranchedTableRowsAfterBranchDelete(OldId)
else if OldId <> NewId then
UpdateBranchedTablesAfterBranchDelete(OldId, NewId);
end;
BranchSet.Free();
BranchSets.Free();
end;
procedure TBranchingSqlDatabase.InitializeBranchedBasedOnExistingBranch(const NewBranch: TInteger; const ExistingBranch: TInteger);
begin
BranchSetManager.AddBranchToAllBranchSetsContainingBranch(NewBranch, ExistingBranch);
end;
function TBranchingSqlDatabase.IsManaged(Table: TSqlTable; Column: TSqlTableColumn): TBoolean;
begin
Result := Column = Table.BranchSet.BranchSetId.Column;
end;
function TBranchingSqlDatabase.IsManaged(Table: TSqlTable): TBoolean;
begin
Result := Table.IsBranching();
end;
procedure TBranchingSqlDatabase.DeleteBranchedTableRowsAfterBranchDelete(const OldId: TInteger);
var
i: TInteger32;
Table: TSqlTable;
begin
for i := 0 to BranchedTables.Count - 1 do
begin
Table := BranchedTables[i];
Database.Query(
Delete(
[ Table ],
[ Table.BranchSet.BranchSetId = OldId ]
)
);
end;
end;
destructor TBranchingSqlDatabase.Destroy();
begin
BranchSetManager.Free();
CurrentBranchSet.Free();
BranchedTables.Free();
inherited Destroy();
end;
function TBranchingSqlDatabase.GenerateCaseStatement(UpdateOperation: TLogicalSqlUpdateOperation): TSqlCase;
var
SqlResult: TSqlResult;
i: TInteger32;
OldBranchSetIds: TArray<TInteger>;
NewBranchSetIds: TArray<TInteger>;
OldBranchSet: TBranchSet;
NewBranchSet: TBranchSet;
begin
SqlResult := Database.Query(
SelectDistinct(
[ UpdateOperation.Table.BranchSet.BranchSetId ],
[ UpdateOperation.Table, UpdateOperation.TemporaryTable ],
[ UpdateOperation.CreateRowEquals() ]
)
);
if SqlResult.GetRowCount() > 0 then
begin
SetLength(OldBranchSetIds, SqlResult.GetRowCount());
SetLength(NewBranchSetIds, SqlResult.GetRowCount());
i := 0;
while SqlResult.FetchRow() do
begin
OldBranchSetIds[i] := SqlResult.ReadInteger();
OldBranchSet := BranchSetManager.GetBranchSetWithId(OldBranchSetIds[i]);
NewBranchSet := BranchSetManager.GetMergedBranchSet(CurrentBranchSet, OldBranchSet);
NewBranchSetIds[i] := NewBranchSet.Id;
Inc(i);
OldBranchSet.Free();
NewBranchSet.Free();
end;
Result := GenerateCaseStatementForBranchIdConversion(OldBranchSetIds, NewBranchSetIds, UpdateOperation.Table.BranchSet.BranchSetId);
end
else
Result := nil;
SqlResult.Free();
end;
function TBranchingSqlDatabase.GenerateCaseStatementForBranchIdConversion(const From: array of TInteger; const ToValues: array of TInteger; CaseColumn: TSqlTableColumnBuilder): TSqlCase;
var
i: TInteger32;
begin
Result := TSqlCase.Create();
for i := 0 to System.Length(From) - 1 do
Result.Branches.Add(TSqlCaseBranch.Create(CaseColumn = From[i], TSqlLiteralInteger.Create(ToValues[i])));
Result.ElseValue := Null;
end;
procedure TBranchingSqlDatabase.HandleCreateTable(Statement: TSqlCreateTable);
var
WorkingCopy: TSqlCreateTable;
begin
WorkingCopy := Statement.CopyCreateTable();
WorkingCopy.AddReference();
if WorkingCopy.Select <> nil then
AddManagingRestrictions(WorkingCopy.Select);
try
Database.Query(WorkingCopy);
finally
WorkingCopy.ReleaseReference();
end;
end;
function TBranchingSqlDatabase.Query(Statement: TSqlStatement; ResultMethod: TSqlQueryResultMethod): TSqlResult;
begin
Result := nil;
UseOwnInsertId := False;
Statement.AddReference();
try
if Statement is TSqlResultSetStatement then
Result := HandleResultSetStatement(Statement as TSqlResultSetStatement, ResultMethod)
else if Statement is TSqlCreateTable then
HandleCreateTable(Statement as TSqlCreateTable)
else if Statement is TSqlUpdate then
HandleUpdate(Statement as TSqlUpdate)
else if Statement is TSqlInsertValues then
HandleInsertValues(Statement as TSqlInsertValues, TSqlAnnotatingInsertType.Insert)
else if Statement is TSqlDelete then
HandleDelete(Statement as TSqlDelete)
else if Statement is TSqlInsertSelect then
HandleInsertSelect(Statement as TSqlInsertSelect, TSqlAnnotatingInsertType.Insert)
else
Result := Database.Query(Statement, ResultMethod);
finally
Statement.ReleaseReference();
end;
end;
procedure TBranchingSqlDatabase.StartUpdateOperation(Table: TSqlTable);
begin
if Table.BranchSet.Handler.IsLocked(Database, CurrentBranchSet) then
raise EBranchingDatabaseBranchSetLocked.Create(Table.Identifier + ' locked for update');
end;
function TBranchingSqlDatabase.CreateInBranchSetSet(BranchSetSubsets: TList<TBranchSet>; Column: TSqlTableColumnBuilder): TSqlExpressionBuilder;
var
BranchSetIds: TArray<TInteger>;
i: TInteger32;
begin
SetLength(BranchSetIds, BranchSetSubsets.Count);
for i := 0 to BranchSetSubsets.Count - 1 do
BranchSetIds[i] := BranchSetSubsets[i].Id;
Result := InSet(Column, IntegerSet(BranchSetIds));
end;
procedure TBranchingSqlDatabase.UpdateBranchedTablesAfterBranchDelete(const OldId: TInteger; const NewId: TInteger);
var
i: TInteger32;
Table: TSqlTable;
begin
for i := 0 to BranchedTables.Count - 1 do
begin
Table := BranchedTables[i];
Database.Query(
Update(
[ Table ],
[ Assign(Table.BranchSet.BranchSetId, NewId) ],
[ Table.BranchSet.BranchSetId = OldId ]
)
);
end;
end;
procedure TBranchingSqlDatabase.UpdateManagingColumns(UpdateOperation: TLogicalSqlUpdateOperation);
var
Case_: TSqlCase;
begin
Case_ := GenerateCaseStatement(UpdateOperation);
if Case_ <> nil then
Database.Query(
Update(
[ UpdateOperation.Table, UpdateOperation.TemporaryTable ],
[ Assign(UpdateOperation.Table.BranchSet.BranchSetId, Case_) ],
[ UpdateOperation.CreateRowEquals() ]
)
);
end;
function TBranchingSqlDatabase.CreateInSubSetExpression(Column: TSqlTableColumnBuilder): TSqlExpressionBuilder;
var
BranchSetSubsets: TList<TBranchSet>;
begin
BranchSetSubsets := BranchSetManager.GetSubsets(CurrentBranchSet);
Result := CreateInBranchSetSet(BranchSetSubsets, Column);
BranchSetSubsets.Free();
end;
function TBranchingSqlDatabase.CreateUpdateOperation(Table: TSqlTable; Columns: TList<TSqlTableColumn>): TLogicalSqlUpdateOperation;
begin
Result := TSqlBranchingUpdateOperation.Create(Database, 'branching$temporary', Table, Columns, BranchSetManager, CurrentBranchSet);
end;
{ EBranchingDatabaseMissingColumnsInInsertException }
constructor EBranchingDatabaseMissingColumnsInInsertException.Create(Table: TSqlTable; ColumnList: TList<TSqlTableColumn>);
var
NonAdministrativeColumns: TList<TSqlTableColumn>;
begin
NonAdministrativeColumns := Table.GetNonBranchingColumns();
inherited Create(
'Got insert for table '
+ Table.TableIdentifier
+ ' with '
+ Integer32ToText(ColumnList.Count)
+ ' columns instead of the expected '
+ Integer32ToText(NonAdministrativeColumns.Count)
+ '.'
);
NonAdministrativeColumns.Free();
end;
{ TSqlBranchingUpdateOperation }
procedure TSqlBranchingUpdateOperation.AddManagingColumns(InsertSelect: TSqlInsertSelect);
begin
InsertSelect.Select.Columns.AddExpression(TSqlLiteralInteger.Create(BranchSet.Id));
InsertSelect.Columns.Add(Table.BranchSet.BranchSetId);
end;
constructor TSqlBranchingUpdateOperation.Create(Database: TSqlDatabase; const TemporaryIdentifier: TText; Table: TSqlTable; Columns: TList<TSqlTableColumn>; BranchSetManager: TBranchSetManager; BranchSet: TBranchSet);
begin
inherited Create(Database, TemporaryIdentifier, Table, Columns);
Self.BranchSetManager := BranchSetManager;
Self.BranchSet := BranchSet;
end;
function TSqlBranchingUpdateOperation.CreatePresentRestriction: TSqlExpression;
var
BranchSets: TList<TBranchSet>;
BranchSetIds: TArray<TInteger>;
i: TInteger32;
begin
BranchSets := BranchSetManager.GetBranchSetsContainingBranchSet(BranchSet);
SetLength(BranchSetIds, BranchSets.Count);
for i := 0 to BranchSets.Count - 1 do
BranchSetIds[i] := BranchSets[i].Id;
Result := TSqlInSet.Create(Table.BranchSet.BranchSetId, IntegerSet(BranchSetIds));
BranchSets.Free();
end;
function TSqlBranchingUpdateOperation.IsManagedColumn(Column: TSqlTableColumn): TBoolean;
begin
Result := Column = Table.BranchSet.BranchSetId.Column;
end;
end.
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