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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.Annotating;
interface
{$SCOPEDENUMS ON}
uses
Boolean,
Collection.List,
Integer,
Sql.Database.Logical,
Sql.Database.Logical.UpdateOperation,
Sql.Expression,
Sql.Result,
Sql.Statement.DataManipulation,
Sql.Statement.ResultSet,
Sql.Table,
Sql.Table.Column;
type
TSqlAnnotatingInsertType = (
Insert,
Replace
);
TAnnotatingSqlDatabase = class(TLogicalSqlDatabase)
protected
UseOwnInsertId: TBoolean;
OwnInsertId: TInteger;
function IsManaged(Table: TSqlTable): TBoolean; overload; virtual;
function IsManaged(Table: TSqlTable; Column: TSqlTableColumn): TBoolean; overload; virtual;
procedure StartUpdateOperation(Table: TSqlTable); virtual;
procedure EndUpdateOperation(); virtual;
procedure AddDeleteRestrictions(Delete: TSqlDelete; Table: TSqlTable); virtual;
procedure AddDeleteAssignments(Update: TSqlUpdate; Table: TSqlTable); virtual;
procedure AddManagingRestrictions(Expression: TSqlExpression); virtual; abstract;
procedure UpdateManagingColumns(UpdateOperation: TLogicalSqlUpdateOperation); virtual; abstract;
function CreateUpdateOperation(Table: TSqlTable; Columns: TList<TSqlTableColumn>): TLogicalSqlUpdateOperation; virtual; abstract;
protected
procedure DeleteMatchingKey(UpdateOperation: TLogicalSqlUpdateOperation);
procedure HandleInsertFromTemporary(UpdateOperation: TLogicalSqlUpdateOperation; InsertType: TSqlAnnotatingInsertType); virtual;
function HandleResultSetStatement(Statement: TSqlResultSetStatement; ResultMethod: TSqlQueryResultMethod): TSqlResult;
procedure HandleInsertValues(InsertValues: TSqlInsertValuesStatement; InsertType: TSqlAnnotatingInsertType);
procedure HandleInsertSelect(InsertSelect: TSqlInsertSelectStatement; InsertType: TSqlAnnotatingInsertType);
procedure HandleUpdate(Statement: TSqlUpdate);
procedure HandleDelete(Statement: TSqlDelete);
public
function InsertId(): TInteger; override;
end;
implementation
uses
Exception,
Object_.List,
Object_.Reference.Counter,
Sql,
Sql.Operator_.Assign,
Sql.Statement.ResultSet.Select,
Sql.Table.Expression.Alias,
Sql.Table.Expression.Reference,
Type_.Structured;
{ TAnnotatingSqlDatabase }
procedure TAnnotatingSqlDatabase.AddDeleteAssignments(Update: TSqlUpdate; Table: TSqlTable);
begin
end;
procedure TAnnotatingSqlDatabase.AddDeleteRestrictions(Delete: TSqlDelete; Table: TSqlTable);
begin
end;
procedure TAnnotatingSqlDatabase.DeleteMatchingKey(UpdateOperation: TLogicalSqlUpdateOperation);
var
UniqueKeyRestrictions: TSqlExpression;
begin
if UpdateOperation.PrimaryKeyColumns.Count > 0 then
begin
Query(
DeleteReferenced(
[ UpdateOperation.Table ],
[ UpdateOperation.TemporaryTable ],
[ UpdateOperation.CreatePrimaryKeyEquals() ]
)
);
end;
UniqueKeyRestrictions := UpdateOperation.CreateUniqueKeyEquals();
if UniqueKeyRestrictions <> nil then
Query(
DeleteReferenced(
[ UpdateOperation.Table ],
[ UpdateOperation.TemporaryTable ],
[ UniqueKeyRestrictions ]
)
);
end;
procedure TAnnotatingSqlDatabase.EndUpdateOperation();
begin
end;
procedure TAnnotatingSqlDatabase.HandleDelete(Statement: TSqlDelete);
var
Table: TSqlTable;
Delete: TSqlDelete;
Update: TSqlUpdate;
WorkingCopy: TSqlDelete;
begin
WorkingCopy := Statement.CopyDelete() as TSqlDelete;
WorkingCopy.AddReference();
try
AddManagingRestrictions(WorkingCopy);
if (WorkingCopy.TargetTables.Count = 1) and IsManaged(WorkingCopy.TargetTables[0]) then
begin
Table := WorkingCopy.TargetTables[0];
StartUpdateOperation(Table);
try
Delete := TSqlDelete.Create();
Delete.TargetTables.Add(Table);
Delete.ReferenceTables.AddAll(WorkingCopy.ReferenceTables);
Delete.Restrictions.AddAll(WorkingCopy.Restrictions);
AddDeleteRestrictions(Delete, Table);
Database.Query(Delete);
Update := TSqlUpdate.Create();
Update.Tables.AddAll(WorkingCopy.ReferenceTables);
Update.Restrictions.AddAll(WorkingCopy.Restrictions);
AddDeleteAssignments(Update, Table);
if Update.Assignments.Count > 0 then
Database.Query(Update)
else
Update.Discard();
finally
EndUpdateOperation();
end;
end
else
begin
for Table in WorkingCopy.TargetTables do
if IsManaged(Table) then
raise EException.Create('Annotating databases only support deletes on one table if a managed table is included.');
Database.Query(WorkingCopy);
end;
finally
WorkingCopy.ReleaseReference();
end;
end;
procedure TAnnotatingSqlDatabase.HandleInsertFromTemporary(UpdateOperation: TLogicalSqlUpdateOperation; InsertType: TSqlAnnotatingInsertType);
var
SelectFromTemporary: TSqlSelect;
InsertFromTemporary: TSqlInsertSelect;
Column: TSqlTableColumn;
begin
if UpdateOperation.ManagedColumns.Count > 0 then
UpdateOperation.ValidateManagedColumns();
// TODO:
// * We should allow only one row when PrimaryKeyColumns.Count = 0 (Empty primary key means at most one row)
// * We should handle AUTO_INCREMENT columns with specified NULL values correctly
// * We should also validate whether the temporary table does not contain duplicate rows with the same primary key
case InsertType of
TSqlAnnotatingInsertType.Insert:
UpdateOperation.CheckKeyViolation();
TSqlAnnotatingInsertType.Replace:
DeleteMatchingKey(UpdateOperation);
else
raise EException.Create('Unknown insert type');
end;
UpdateManagingColumns(UpdateOperation);
SelectFromTemporary := TSqlSelect.Create();
SelectFromTemporary.From.Add(UpdateOperation.TemporaryTable.ToExpression());
for Column in UpdateOperation.UnmanagedColumns do
SelectFromTemporary.Columns.AddTableColumn(UpdateOperation.ToTemporary[Column]);
SelectFromTemporary.Restrictions.Add(
not Sql.Exists(
Select(
[ 1 ],
[ UpdateOperation.Table ],
[
UpdateOperation.CreateRowEquals(),
UpdateOperation.CreatePresentRestriction()
]
)
)
);
InsertFromTemporary := TSqlInsertSelect.Create(UpdateOperation.Table, SelectFromTemporary);
InsertFromTemporary.Columns.AddAll(UpdateOperation.UnmanagedColumns);
UpdateOperation.AddManagingColumns(InsertFromTemporary);
OwnInsertId := Database.Insert(InsertFromTemporary);
UseOwnInsertId := True;
end;
procedure TAnnotatingSqlDatabase.HandleInsertSelect(InsertSelect: TSqlInsertSelectStatement; InsertType: TSqlAnnotatingInsertType);
var
WorkingCopy: TSqlInsertSelectStatement;
UpdateOperation: TLogicalSqlUpdateOperation;
begin
WorkingCopy := InsertSelect.CopyInsertSelectStatement();
WorkingCopy.AddReference();
try
AddManagingRestrictions(WorkingCopy.Select);
if IsManaged(WorkingCopy.Table) then
begin
StartUpdateOperation(WorkingCopy.Table);
try
UpdateOperation := CreateUpdateOperation(WorkingCopy.Table, WorkingCopy.Columns);
try
UpdateOperation.FillTemporaryTable(WorkingCopy.Select);
HandleInsertFromTemporary(UpdateOperation, InsertType);
finally
UpdateOperation.Free();
end;
finally
EndUpdateOperation();
end;
end
else
Database.Query(WorkingCopy);
finally
WorkingCopy.ReleaseReference();
end;
end;
procedure TAnnotatingSqlDatabase.HandleInsertValues(InsertValues: TSqlInsertValuesStatement; InsertType: TSqlAnnotatingInsertType);
var
UpdateOperation: TLogicalSqlUpdateOperation;
begin
if IsManaged(InsertValues.Table) then
begin
StartUpdateOperation(InsertValues.Table);
try
UpdateOperation := CreateUpdateOperation(InsertValues.Table, InsertValues.Columns);
try
UpdateOperation.FillTemporaryTable(InsertValues.Rows);
HandleInsertFromTemporary(UpdateOperation, InsertType);
finally
UpdateOperation.Free();
end;
finally
EndUpdateOperation();
end;
end
else
Database.Query(InsertValues);
end;
function TAnnotatingSqlDatabase.HandleResultSetStatement(Statement: TSqlResultSetStatement; ResultMethod: TSqlQueryResultMethod): TSqlResult;
var
WorkingCopy: TSqlResultSetStatement;
begin
WorkingCopy := Statement.CopyResultSetStatement();
WorkingCopy.AddReference();
try
AddManagingRestrictions(WorkingCopy);
Result := Database.Query(WorkingCopy, ResultMethod);
finally
WorkingCopy.ReleaseReference();
end;
end;
procedure TAnnotatingSqlDatabase.HandleUpdate(Statement: TSqlUpdate);
var
Table: TSqlTable;
Column: TSqlTableColumn;
WorkingCopy: TSqlUpdate;
AllColumns: TList<TSqlTableColumn>;
ColumnsToUpdate: TList<TSqlTableColumn>;
ColumnsToCopy: TList<TSqlTableColumn>;
UpdateOperation: TLogicalSqlUpdateOperation;
Select: TSqlSelect;
Assignment: TSqlAssign;
Delete: TSqlDelete;
begin
WorkingCopy := Statement.Copy() as TSqlUpdate;
WorkingCopy.AddReference();
try
AddManagingRestrictions(WorkingCopy);
if WorkingCopy.Tables[0] is TSqlTableReference then
Table := (WorkingCopy.Tables[0] as TSqlTableReference).Table
else if
(WorkingCopy.Tables[0] is TSqlAliasedTableExpression)
and ((WorkingCopy.Tables[0] as TSqlAliasedTableExpression).TableExpression is TSqlTableReference)
then
Table := ((WorkingCopy.Tables[0] as TSqlAliasedTableExpression).TableExpression as TSqlTableReference).Table
else
Table := nil;
if (Table <> nil) and IsManaged(Table) then
begin
if Statement.Tables.Count > 1 then
begin
for Assignment in Statement.Assignments do
if not Table.Columns.Contains(Assignment.Column) then
raise EException.Create('Updating value not in primary table');
end;
StartUpdateOperation(Table);
try
ColumnsToUpdate := WorkingCopy.GetColumns();
ColumnsToCopy := TObjectList<TSqlTableColumn>.Create();
ColumnsToCopy.ElementManager := TReferenceCounter<TSqlTableColumn>.Create();
for Column in Table.Columns do
if not IsManaged(Table, Column) then
begin
if not ColumnsToUpdate.Contains(Column) and not (Column.Type_ is TStructuredType) then
ColumnsToCopy.Add(Column);
end;
AllColumns := TObjectList<TSqlTableColumn>.Create();
AllColumns.ElementManager := TReferenceCounter<TSqlTableColumn>.Create();
AllColumns.AddAll(ColumnsToUpdate);
AllColumns.AddAll(ColumnsToCopy);
UpdateOperation := CreateUpdateOperation(Table, AllColumns);
try
Select := TSqlSelect.Create();
Select.From.AddAll(WorkingCopy.Tables);
for Assignment in WorkingCopy.Assignments do
Select.Columns.AddExpression(Assignment.Value);
for Column in ColumnsToCopy do
Select.Columns.AddTableColumn(Column);
Select.Restrictions.AddAll(WorkingCopy.Restrictions);
UpdateOperation.FillTemporaryTable(Select);
Delete := TSqlDelete.Create();
Delete.TargetTables.Add(UpdateOperation.Table);
Delete.ReferenceTables.AddAll(WorkingCopy.Tables);
Delete.Restrictions.AddAll(WorkingCopy.Restrictions);
Delete.Restrictions.Add(
not Sql.Exists(
Sql.Select(
[ 1 ],
[ UpdateOperation.TemporaryTable ],
[ UpdateOperation.CreateRowEquals() ]
)
)
);
Query(Delete);
Database.Query(
Sql.DeleteReferenced(
[ UpdateOperation.TemporaryTable ],
[ UpdateOperation.Table ],
[
UpdateOperation.CreateRowEquals(),
UpdateOperation.CreatePresentRestriction()
]
)
);
HandleInsertFromTemporary(UpdateOperation, TSqlAnnotatingInsertType.Insert);
finally
UpdateOperation.Free();
ColumnsToUpdate.Free();
ColumnsToCopy.Free();
AllColumns.Free();
end;
finally
EndUpdateOperation();
end;
end
else
Database.Query(WorkingCopy);
finally
WorkingCopy.ReleaseReference();
end;
end;
function TAnnotatingSqlDatabase.InsertId: TInteger;
begin
if UseOwnInsertId then
Result := OwnInsertId
else
Result := inherited InsertId();
end;
function TAnnotatingSqlDatabase.IsManaged(Table: TSqlTable; Column: TSqlTableColumn): TBoolean;
begin
Result := False;
end;
function TAnnotatingSqlDatabase.IsManaged(Table: TSqlTable): TBoolean;
begin
Result := False;
end;
procedure TAnnotatingSqlDatabase.StartUpdateOperation(Table: TSqlTable);
begin
end;
end.
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