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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.Hierarchical;
interface
// TODO: The class should be implemented to thoroughly iterate over entire SQL expressions and not just take simple short cuts
uses
Boolean,
Collection.List,
Exception,
Integer._32,
Object_.List,
Sql.Database,
Sql.Database.Logical,
Sql.Expression,
Sql.Expression.Row.Set_,
Sql.Functions.FlowControl,
Sql.Result,
Sql.Result.Decorating,
Sql.Statement,
Sql.Statement.DataDefinition.Table.Create,
Sql.Statement.DataManipulation,
Sql.Statement.ResultSet,
Sql.Statement.ResultSet.Select,
Sql.Statement.ResultSet.Union,
Sql.Subquery,
Sql.Table,
Sql.Table.Column,
Sql.Table.Expression,
Sql.Table.Physical,
Text,
Type_.Structured.Value;
type
TRecordSetColumn = class(TObject)
private
FColumn: TSqlTableColumn;
procedure SetColumn(const Value: TSqlTableColumn);
public
Subtable: TSqlTable;
destructor Destroy(); override;
property Column: TSqlTableColumn read FColumn write SetColumn;
end;
THierarchicalSqlResult = class(TDecoratingSqlResult)
protected
Database: TSqlDatabase;
RecordSetColumns: TObjectList<TRecordSetColumn>;
RecordSetField: TInteger32;
public
constructor Create(DecoratedResult: TSqlResult; Database: TSqlDatabase; RecordSetColumns: TObjectList<TRecordSetColumn>); reintroduce; virtual;
destructor Destroy(); override;
function FetchRow(): TBoolean; override;
function ReadRecordSet(): TRecordSet; override;
end;
THierarchicalSqlDatabase = class(TLogicalSqlDatabase)
protected
procedure ExpandExpression(Expression: TSqlExpression);
procedure ExpandResultSetStatement(Statement: TSqlResultSetStatement);
procedure ExpandUnion(Union: TSqlUnion);
procedure ExpandInSubquery(InSubquery: TSqlInSubquery);
procedure ExpandIfNull(IfNull: TSqlIfNull);
procedure ExpandExists(Exists: TSqlExists);
function ExpandTableColumn(Column: TSqlTableColumn): TList<TSqlTableColumn>;
function ShouldExpandTableExpression(TableExpression: TSqlTableExpression): TBoolean;
function ShouldExpandTableExpressions(TableExpressions: TList<TSqlTableExpression>): TBoolean;
procedure ExpandTableExpression(TableExpression: TSqlTableExpression);
procedure ExpandTableExpressions(TableExpressions: TList<TSqlTableExpression>);
function CreateSubtable(Table: TSqlTable; Column: TSqlTableColumn): TSqlPhysicalTable;
function GetPhysicalTableForTableExpression(Expression: TSqlTableExpression; const ColumnIdentifier: TText): TSqlPhysicalTable;
function GetPhysicalTableForResultSetStatement(ResultSetStatement: TSqlResultSetStatement; const ColumnIdentifier: TText): TSqlPhysicalTable;
function GetPhysicalTable(Table: TSqlTable; const ColumnIdentifier: TText): TSqlPhysicalTable;
procedure ExpandSelect(Select: TSqlSelect; RecordSetColumns: TObjectList<TRecordSetColumn> = nil);
procedure ExpandColumns(Columns: TSqlResultSetColumnList; RecordSetColumns: TObjectList<TRecordSetColumn>);
procedure ExpandOrderBy(OrderBy: TList<TSqlOrderByExpression>);
function ExecuteExpandedSelect(Select: TSqlSelect; ResultMethod: TSqlQueryResultMethod): TSqlResult;
function HandleSelect(Select: TSqlSelect; ResultMethod: TSqlQueryResultMethod): TSqlResult;
function CreateRecordSetInsertStatement(Table: TSqlTable; Column: TSqlTableColumn; RowSet: TSqlRowSet): TSqlInsertValues;
function ShouldExpandInsert(Insert: TSqlInsertStatement): TBoolean;
procedure ExecuteExpandedInsertValues(InsertValues: TSqlInsertValues);
procedure ExecuteExpandedInsertSelect(InsertSelect: TSqlInsertSelect);
procedure HandleInsert(Insert: TSqlInsertStatement);
function ShouldExpandUpdate(Update: TSqlUpdate): TBoolean;
procedure ExecuteExpandedUpdate(Update: TSqlUpdate);
procedure HandleUpdate(Update: TSqlUpdate);
function ShouldExpandDelete(Delete: TSqlDelete): TBoolean;
procedure ExecuteExpandedDelete(Delete: TSqlDelete);
procedure HandleDelete(Delete: TSqlDelete);
procedure ExpandColumnsInCreateTable(CreateTable: TSqlCreateTable);
procedure ExecuteExpandedCreateTable(CreateTable: TSqlCreateTable);
procedure HandleCreateTable(CreateTable: TSqlCreateTable);
public
function Query(Statement: TSqlStatement; ResultMethod: TSqlQueryResultMethod = sqrmStoreResult): TSqlResult; override;
end;
EHierarchicalSqlDatabase = class(EException);
implementation
uses
Collection.List.Array_,
Currency.Type_,
Currency.Value,
Integer,
Object_.Reference.Counter,
SerialIdentifier.Type_,
Sql.Builder,
Sql.Database.Logical.Versioned.Table.Set_,
Sql.Expression.Row,
Sql.Literal,
Sql.Operator_.Assign,
Sql.Operator_.Binary,
Sql.Table.Column.Reference,
Sql.Table.Expression.Decorating,
Sql.Table.Expression.Reference,
Sql.Table.Expression.ResultSetStatement,
Sql.Table.Scope,
Sql.View.Subquery,
Text.Value,
Type_,
Type_.Structured,
Type_.Structured.Member,
Value,
Value.Unknown;
{ THierarchicalSqlDatabase }
procedure THierarchicalSqlDatabase.ExpandColumnsInCreateTable(CreateTable: TSqlCreateTable);
var
i: TInteger32;
j: TInteger32;
Specification: TSqlCreateTableSpecification;
CreateColumn: TSqlCreateColumn;
ExpandedColumns: TList<TSqlTableColumn>;
Type_: TStructuredType;
begin
i := 0;
while i < CreateTable.Specifications.Count do
begin
Specification := CreateTable.Specifications[i];
if Specification.ContainsStructuredColumn() then
begin
if Specification is TSqlCreateColumn then
begin
CreateColumn := Specification as TSqlCreateColumn;
CreateColumn.AddReference();
try
CreateTable.Specifications.RemoveAt(i);
Type_ := CreateColumn.Column.Type_.GetDecoratedType() as TStructuredType;
if Type_ is TRecordType then
begin
ExpandedColumns := ExpandTableColumn(CreateColumn.Column);
for j := 0 to ExpandedColumns.Count - 1 do
begin
CreateTable.Specifications.AddAt(i, TSqlCreateColumn.Create(ExpandedColumns[j]));
Inc(i);
end;
ExpandedColumns.Free();
end
else if Type_ is TRecordSetType then
// TODO: Currently we skip TRecordSetType columns, however, instead we should create an extra table
else
raise EHierarchicalSqlDatabase.Create('Cannot handle structured type: ' + Type_.ClassName);
finally
CreateColumn.ReleaseReference();
end;
end
else
raise EHierarchicalSqlDatabase.Create('Cannot handle structured column in create table specification: ' + Specification.ClassName);
end;
Inc(i);
end;
end;
procedure THierarchicalSqlDatabase.ExpandExists(Exists: TSqlExists);
begin
ExpandResultSetStatement(Exists.Subquery);
end;
procedure THierarchicalSqlDatabase.ExpandExpression(Expression: TSqlExpression);
begin
if Expression is TSqlInSubquery then
ExpandInSubquery(Expression as TSqlInSubquery)
else if Expression is TSqlIfNull then
ExpandIfNull(Expression as TSqlIfNull)
else if Expression is TSqlExists then
ExpandExists(Expression as TSqlExists);
end;
procedure THierarchicalSqlDatabase.ExpandIfNull(IfNull: TSqlIfNull);
begin
ExpandExpression(IfNull.Condition);
ExpandExpression(IfNull.Value);
end;
procedure THierarchicalSqlDatabase.ExpandInSubquery(InSubquery: TSqlInSubquery);
begin
ExpandExpression(InSubquery.Value);
ExpandResultSetStatement(InSubquery.Subquery);
end;
procedure THierarchicalSqlDatabase.ExpandColumns(Columns: TSqlResultSetColumnList; RecordSetColumns: TObjectList<TRecordSetColumn>);
var
i: TInteger32;
j: TInteger32;
Column: TSqlResultSetColumn;
TableColumn: TSqlTableColumn;
Row: TSqlRow;
ExpandedColumns: TList<TSqlTableColumn>;
Table: TSqlTable;
RecordSetColumn: TRecordSetColumn;
ColumnType: TType;
begin
i := 0;
while i < Columns.Count do
begin
Column := Columns[i];
Column.AddReference();
try
if Column.Expression is TSqlTableColumnReference then
begin
TableColumn := (Column.Expression as TSqlTableColumnReference).Column;
TableColumn.AddReference();
try
ColumnType := TableColumn.Type_.GetDecoratedType();
if ColumnType is TRecordType then
begin
Columns.RemoveAt(i);
ExpandedColumns := ExpandTableColumn(TableColumn);
for j := 0 to ExpandedColumns.Count - 1 do
begin
Columns.AddAt(i, TSqlResultSetColumn.Create(TSqlTableColumnReference.Create(ExpandedColumns[j])));
Inc(i);
end;
ExpandedColumns.Free();
end
else if ColumnType is TRecordSetType then
begin
Table := (TableColumn.Scope as TSqlTableScope).Table;
if Table is TSqlPhysicalTable then
begin
if Table.PrimaryKey.Columns.Count = 1 then
begin
Column.Expression := TSqlTableColumnReference.Create(Table.PrimaryKey.Columns[0].Column);
Column.Alias := TSqlColumnAlias.Create(TableColumn.Identifier, TableColumn.Caption);
end
else
raise EHierarchicalSqlDatabase.Create('Can only handle record set value for single column primary key');
end;
if RecordSetColumns <> nil then
begin
RecordSetColumn := TRecordSetColumn.Create();
RecordSetColumn.Column := TableColumn;
RecordSetColumn.Subtable := CreateSubtable(GetPhysicalTable(Table, Column.GetIdentifier()), TableColumn);
RecordSetColumns.Add(RecordSetColumn);
end;
Inc(i);
end
else
Inc(i);
finally
TableColumn.ReleaseReference();
end;
end
else if Column.Expression is TSqlRow then
begin
Row := Column.Expression as TSqlRow;
Row.AddReference();
try
Columns.RemoveAt(i);
for j := 0 to Row.Columns.Count - 1 do
begin
Columns.AddAt(i, TSqlResultSetColumn.Create(Row.Columns[j]));
Inc(i);
end;
finally
Row.ReleaseReference();
end;
end
else
begin
ExpandExpression(Column.Expression);
Inc(i);
end;
finally
Column.ReleaseReference();
end;
end;
end;
procedure THierarchicalSqlDatabase.ExpandOrderBy(OrderBy: TList<TSqlOrderByExpression>);
var
i: TInteger32;
Column: TSqlOrderByExpression;
TableColumn: TSqlTableColumn;
begin
i := 0;
while i < OrderBy.Count do
begin
Column := OrderBy[i];
Column.AddReference();
try
if Column.Expression is TSqlTableColumnReference then
begin
TableColumn := (Column.Expression as TSqlTableColumnReference).Column;
if TableColumn.Type_.GetDecoratedType() is TRecordType then
begin
// TODO: We currently remove TRecordType columns from the ORDER BY clause, instead we should expand the table column
OrderBy.RemoveAt(i);
end;
end;
finally
Column.ReleaseReference();
end;
Inc(i);
end;
end;
procedure THierarchicalSqlDatabase.ExpandResultSetStatement(Statement: TSqlResultSetStatement);
begin
if Statement is TSqlSelect then
ExpandSelect(Statement as TSqlSelect)
else if Statement is TSqlUnion then
ExpandUnion(Statement as TSqlUnion)
else
raise EHierarchicalSqlDatabase.Create('Unknown result set statement: ' + Statement.ClassName);
end;
procedure THierarchicalSqlDatabase.ExpandSelect(Select: TSqlSelect; RecordSetColumns: TObjectList<TRecordSetColumn> = nil);
begin
ExpandColumns(Select.Columns, RecordSetColumns);
ExpandOrderBy(Select.OrderBy);
ExpandTableExpressions(Select.From);
end;
function THierarchicalSqlDatabase.ExpandTableColumn(Column: TSqlTableColumn): TList<TSqlTableColumn>;
var
MemberColumn: TSqlTableColumn;
RecordType: TRecordType;
Member: TStructuredTypeMember;
i: TInteger32;
ColumnType: TType;
begin
Result := TObjectList<TSqlTableColumn>.Create();
Result.ElementManager := TReferenceCounter<TSqlTableColumn>.Create();
ColumnType := Column.Type_.GetDecoratedType();
if ColumnType is TRecordType then
begin
RecordType := ColumnType as TRecordType;
for i := 0 to RecordType.Members.Count - 1 do
begin
Member := RecordType.Members[i];
MemberColumn := TSqlTableColumn.Create();
MemberColumn.Scope := Column.Scope;
MemberColumn.Identifier := Column.Identifier + '.' + Member.Identifier;
MemberColumn.Type_ := Member.Type_;
MemberColumn.Aggregates.AddAll(Column.Aggregates);
Result.Add(MemberColumn);
end;
end
else
raise EHierarchicalSqlDatabase.Create('Cannot expand table column for type: ' + ColumnType.ToText());
end;
procedure THierarchicalSqlDatabase.ExpandTableExpression(TableExpression: TSqlTableExpression);
begin
if TableExpression is TSqlResultSetStatementTableExpression then
ExpandResultSetStatement((TableExpression as TSqlResultSetStatementTableExpression).Statement as TSqlResultSetStatement)
else if TableExpression is TSqlDecoratingTableExpression then
ExpandTableExpression((TableExpression as TSqlDecoratingTableExpression).DecoratedExpression);
end;
procedure THierarchicalSqlDatabase.ExpandTableExpressions(TableExpressions: TList<TSqlTableExpression>);
var
i: TInteger32;
begin
for i := 0 to TableExpressions.Count - 1 do
ExpandTableExpression(TableExpressions[i]);
end;
procedure THierarchicalSqlDatabase.ExpandUnion(Union: TSqlUnion);
var
Statement: TSqlResultSetStatement;
begin
for Statement in Union.Statements do
ExpandResultSetStatement(Statement);
end;
function THierarchicalSqlDatabase.GetPhysicalTable(Table: TSqlTable; const ColumnIdentifier: TText): TSqlPhysicalTable;
begin
Result := nil;
if Table is TSqlPhysicalTable then
Result := Table as TSqlPhysicalTable
else if Table is TSqlSubqueryView then
Result := GetPhysicalTableForResultSetStatement((Table as TSqlSubqueryView).Statement, ColumnIdentifier);
if Result = nil then
raise EHierarchicalSqlDatabase.Create('Cannot determine physical table');
end;
function THierarchicalSqlDatabase.GetPhysicalTableForResultSetStatement(ResultSetStatement: TSqlResultSetStatement; const ColumnIdentifier: TText): TSqlPhysicalTable;
var
Select: TSqlSelect;
TableExpression: TSqlTableExpression;
ResultSetColumn: TSqlResultSetColumn;
TableColumn: TSqlTableColumn;
begin
Result := nil;
if ResultSetStatement is TSqlSelect then
begin
Select := ResultSetStatement as TSqlSelect;
ResultSetColumn := Select.Columns.FindWithIdentifier(ColumnIdentifier);
TableColumn := (ResultSetColumn.Expression as TSqlTableColumnReference).Column;
TableExpression := Select.From.Find(TSqlTableExpression.THasIdentifier.Create(TableColumn.Scope.Identifier));
Result := GetPhysicalTableForTableExpression(TableExpression, TableColumn.Identifier);
end;
end;
function THierarchicalSqlDatabase.GetPhysicalTableForTableExpression(Expression: TSqlTableExpression; const ColumnIdentifier: TText): TSqlPhysicalTable;
begin
if Expression is TSqlTableReference then
Result := GetPhysicalTable((Expression as TSqlTableReference).Table, ColumnIdentifier)
else if Expression is TSqlResultSetStatementTableExpression then
Result := GetPhysicalTableForResultSetStatement((Expression as TSqlResultSetStatementTableExpression).Statement, ColumnIdentifier)
else if Expression is TSqlDecoratingTableExpression then
Result := GetPhysicalTableForTableExpression((Expression as TSqlDecoratingTableExpression).DecoratedExpression, ColumnIdentifier)
else
Result := nil;
end;
procedure THierarchicalSqlDatabase.HandleCreateTable(CreateTable: TSqlCreateTable);
begin
ExecuteExpandedCreateTable(CreateTable);
end;
procedure THierarchicalSqlDatabase.HandleDelete(Delete: TSqlDelete);
begin
if ShouldExpandDelete(Delete) then
ExecuteExpandedDelete(Delete)
else
Database.Query(Delete);
end;
procedure THierarchicalSqlDatabase.HandleInsert(Insert: TSqlInsertStatement);
var
WorkingCopy: TSqlInsertStatement;
begin
if ShouldExpandInsert(Insert) then
begin
WorkingCopy := Insert.CopyInsertStatement();
WorkingCopy.AddReference();
try
if Insert is TSqlInsertValues then
ExecuteExpandedInsertValues(WorkingCopy as TSqlInsertValues)
else if Insert is TSqlInsertSelect then
ExecuteExpandedInsertSelect(WorkingCopy as TSqlInsertSelect)
else
raise EHierarchicalSqlDatabase.Create('Insert other than values or select that needs to be expanded is not supported yet');
finally
WorkingCopy.ReleaseReference();
end;
end
else
inherited Query(Insert);
end;
function THierarchicalSqlDatabase.HandleSelect(Select: TSqlSelect; ResultMethod: TSqlQueryResultMethod): TSqlResult;
begin
Result := ExecuteExpandedSelect(Select, ResultMethod);
end;
procedure THierarchicalSqlDatabase.HandleUpdate(Update: TSqlUpdate);
begin
if ShouldExpandUpdate(Update) then
ExecuteExpandedUpdate(Update)
else
Database.Query(Update);
end;
function THierarchicalSqlDatabase.CreateRecordSetInsertStatement(Table: TSqlTable; Column: TSqlTableColumn; RowSet: TSqlRowSet): TSqlInsertValues;
var
Subtable: TSqlPhysicalTable;
Index: TInteger32;
Row: TSqlRow;
Subcolumn: TSqlTableColumn;
begin
Subtable := CreateSubtable(Table, Column);
Result := TSqlInsertValues.Create(Subtable);
for Subcolumn in Subtable.Columns do
if
(Subtable.LifeTime = nil)
or (
(Subcolumn <> Subtable.LifeTime.AddTransactionId.Column)
and (Subcolumn <> Subtable.LifeTime.RemoveTransactionId.Column)
)
then
Result.Columns.Add(Subcolumn);
for Row in RowSet.Rows do
begin
Row.Columns.RejectUnassigned := False;
for Index := 0 to Table.PrimaryKey.Columns.Count - 1 do
Row.Columns.AddAt(Index, nil);
Result.Rows.Add(Row);
end;
end;
function THierarchicalSqlDatabase.CreateSubtable(Table: TSqlTable; Column: TSqlTableColumn): TSqlPhysicalTable;
var
i: TInteger32;
KeyColumn: TSqlTableColumn;
CreatedColumn: TSqlTableColumnBuilder;
Type_: TRecordSetType;
Member: TStructuredTypeMember;
begin
Result := TSqlPhysicalTable.Create(Table.Identifier + '$' + Column.Identifier);
for i := 0 to Table.PrimaryKey.Columns.Count - 1 do
begin
KeyColumn := Table.PrimaryKey.Columns[i].Column;
CreatedColumn := Result.CreateColumn('Parent.' + KeyColumn.Identifier, nil, KeyColumn.Type_);
CreatedColumn.Column.Aggregates.AddAll(KeyColumn.Aggregates);
end;
Type_ := Column.Type_.GetDecoratedType() as TRecordSetType;
Result.SetPrimaryKey([]);
for i := 0 to Type_.RecordType.Members.Count - 1 do
begin
Member := Type_.RecordType.Members[i];
CreatedColumn := Result.CreateColumn(Member.Identifier, Member.Caption, Member.Type_);
if Type_.KeyMembers.Contains(Member) then
Result.PrimaryKey.Columns.Add(CreatedColumn);
end;
if Type_ is TVersionedRecordSetType then
Result.AddVersioning(VersionedDatabaseTableSet.Log);
end;
procedure THierarchicalSqlDatabase.ExecuteExpandedCreateTable(CreateTable: TSqlCreateTable);
var
ExpandedCreateTable: TSqlCreateTable;
begin
ExpandedCreateTable := CreateTable.CopyCreateTable();
ExpandedCreateTable.AddReference();
try
ExpandColumnsInCreateTable(ExpandedCreateTable);
Database.Query(ExpandedCreateTable);
finally
ExpandedCreateTable.ReleaseReference();
end;
end;
procedure THierarchicalSqlDatabase.ExecuteExpandedDelete(Delete: TSqlDelete);
var
ExpandedDelete: TSqlDelete;
begin
// TODO: We should also inspect the restrictions
ExpandedDelete := Delete.CopyDelete();
ExpandedDelete.AddReference();
try
ExpandTableExpressions(ExpandedDelete.ReferenceTables);
Database.Query(ExpandedDelete);
finally
ExpandedDelete.ReleaseReference();
end;
end;
procedure THierarchicalSqlDatabase.ExecuteExpandedInsertSelect(InsertSelect: TSqlInsertSelect);
var
Columns: TList<TSqlTableColumn>;
Column: TSqlTableColumn;
ColumnsIndex: TInteger32;
SelectColumns: TSqlResultSetColumnList;
SelectColumn: TSqlResultSetColumn;
SelectColumnsIndex: TInteger32;
ExpandedColumns: TList<TSqlTableColumn>;
Value: TSqlExpression;
Row: TSqlRow;
i: TInteger32;
begin
Columns := InsertSelect.Columns;
ColumnsIndex := 0;
SelectColumns := InsertSelect.Select.Columns;
SelectColumnsIndex := 0;
while ColumnsIndex < Columns.Count do
begin
Column := Columns[ColumnsIndex];
Column.AddReference();
SelectColumn := SelectColumns[SelectColumnsIndex];
SelectColumn.AddReference();
try
if Column.Type_.GetDecoratedType() is TRecordType then
begin
Columns.RemoveAt(ColumnsIndex);
ExpandedColumns := ExpandTableColumn(Column);
InsertSelect.Columns.AddAllAt(ColumnsIndex, ExpandedColumns);
Inc(ColumnsIndex, ExpandedColumns.Count);
Value := SelectColumn.Expression;
Value.AddReference();
try
if (Value is TSqlRow) or (Value is TSqlNull) then
begin
SelectColumns.RemoveAt(SelectColumnsIndex);
if Value is TSqlRow then
begin
Row := Value as TSqlRow;
if Row.Columns.Count = ExpandedColumns.Count then
begin
for i := 0 to Row.Columns.Count - 1 do
begin
SelectColumns.AddAt(SelectColumnsIndex, TSqlResultSetColumn.Create(Row.Columns[i]));
Inc(SelectColumnsIndex);
end;
end
else
raise EHierarchicalSqlDatabase.Create('Column count does not match');
end
else if Value is TSqlNull then
begin
for i := 1 to ExpandedColumns.Count do
begin
SelectColumns.AddAt(SelectColumnsIndex, TSqlResultSetColumn.Create(TSqlNull.Create()));
Inc(SelectColumnsIndex);
end;
end;
end;
finally
Value.ReleaseReference();
ExpandedColumns.Free();
end;
end
else
begin
Inc(ColumnsIndex);
Inc(SelectColumnsIndex);
end;
finally
SelectColumn.ReleaseReference();
Column.ReleaseReference();
end;
end;
ExpandSelect(InsertSelect.Select);
Database.Query(InsertSelect);
end;
procedure THierarchicalSqlDatabase.ExecuteExpandedInsertValues(InsertValues: TSqlInsertValues);
var
Columns: TList<TSqlTableColumn>;
ColumnIndex: TInteger32;
ColumnType: TType;
SourceRow: TSqlRow;
Column: TSqlTableColumn;
Value: TSqlExpression;
i: TInteger32;
ExpandedColumns: TList<TSqlTableColumn>;
Row: TSqlRow;
RecordType: TRecordType;
RecordSetStatements: TList<TSqlInsertValues>;
RecordSetStatement: TSqlInsertValues;
SerialIdentifier: TInteger;
begin
if InsertValues.Rows.Count > 1 then
raise EHierarchicalSqlDatabase.Create('InsertValues with multiple rows that needs to be expanded is not supported yet');
RecordSetStatements := TArrayList<TSqlInsertValues>.Create();
RecordSetStatements.ElementManager := TReferenceCounter<TSqlInsertValues>.Create();
Columns := InsertValues.Columns;
SourceRow := InsertValues.Rows[0];
ColumnIndex := 0;
while ColumnIndex < Columns.Count do
begin
Column := Columns[ColumnIndex];
Column.AddReference();
Value := SourceRow.Columns[ColumnIndex];
Value.AddReference();
try
ColumnType := Column.Type_.GetDecoratedType();
if ColumnType is TRecordType then
begin
Columns.RemoveAt(ColumnIndex);
RecordType := ColumnType as TRecordType;
ExpandedColumns := ExpandTableColumn(Column);
InsertValues.Columns.AddAllAt(ColumnIndex, ExpandedColumns);
if Value is TSqlRow then
begin
Row := Value as TSqlRow;
SourceRow.Columns.RemoveAt(ColumnIndex);
SourceRow.Columns.AddAllAt(ColumnIndex, Row.Columns);
end
else if Value is TSqlNull then
begin
for i := 1 to RecordType.Members.Count - 1 do
SourceRow.Columns.AddAt(ColumnIndex + i, TSqlNull.Create());
end
else
raise EHierarchicalSqlDatabase.Create('Unknown value for structured column');
Inc(ColumnIndex, ExpandedColumns.Count);
ExpandedColumns.Free();
end
else if ColumnType is TRecordSetType then
begin
RecordSetStatements.Add(CreateRecordSetInsertStatement(InsertValues.Table, Column, Value as TSqlRowSet));
Columns.RemoveAt(ColumnIndex);
SourceRow.Columns.RemoveAt(ColumnIndex);
end
else
Inc(ColumnIndex);
finally
Column.ReleaseReference();
Value.ReleaseReference();
end;
end;
if RecordSetStatements.Count > 0 then
begin
if (InsertValues.Table.PrimaryKey.Columns.Count = 1) and (InsertValues.Table.PrimaryKey.Columns[0].Column.Type_.GetDecoratedType() is TSerialIdentifierType) then
begin
SerialIdentifier := Database.Insert(InsertValues);
for RecordSetStatement in RecordSetStatements do
begin
for i := 0 to RecordSetStatement.Rows.Count - 1 do
RecordSetStatement.Rows[i].Columns[0] := TSqlLiteralInteger.Create(SerialIdentifier);
Database.Query(RecordSetStatement);
RecordSetStatement.Table.Free();
end;
end
else
raise EHierarchicalSqlDatabase.Create('Cannot insert record set');
end
else
Database.Query(InsertValues);
RecordSetStatements.Free();
end;
function THierarchicalSqlDatabase.ExecuteExpandedSelect(Select: TSqlSelect; ResultMethod: TSqlQueryResultMethod): TSqlResult;
var
ExpandedSelect: TSqlSelect;
RecordSetColumns: TObjectList<TRecordSetColumn>;
begin
ExpandedSelect := Select.CopySelect();
ExpandedSelect.AddReference();
try
RecordSetColumns := TObjectList<TRecordSetColumn>.Create();
ExpandSelect(ExpandedSelect, RecordSetColumns);
Result := Database.Query(ExpandedSelect);
if RecordSetColumns.Count > 0 then
Result := THierarchicalSqlResult.Create(Result, Database, RecordSetColumns)
else
RecordSetColumns.Free();
finally
ExpandedSelect.ReleaseReference();
end;
end;
procedure THierarchicalSqlDatabase.ExecuteExpandedUpdate(Update: TSqlUpdate);
var
ExpandedUpdate: TSqlUpdate;
TableExpression: TSqlTableExpression;
Assignments: TList<TSqlAssign>;
Assignment: TSqlAssign;
Column: TSqlTableColumn;
ColumnType: TType;
Value: TSqlExpression;
Values: TList<TSqlExpression>;
i: TInteger32;
j: TInteger32;
ExpandedColumns: TList<TSqlTableColumn>;
Row: TSqlRow;
RecordType: TRecordType;
begin
// TODO: We should also expand columns in restrictions, table expressions, column expressions, et cetera
Assignments := Update.Assignments;
ExpandedUpdate := TSqlUpdate.Create();
for i := 0 to Update.Tables.Count - 1 do
begin
TableExpression := Update.Tables[i].CopyTableExpression();
ExpandTableExpression(TableExpression);
ExpandedUpdate.Tables.Add(TableExpression);
end;
ExpandedUpdate.Restrictions.AddAll(Update.Restrictions);
for i := 0 to Assignments.Count - 1 do
begin
Assignment := Assignments[i];
Column := Assignment.Column;
Value := Assignment.Value;
ColumnType := Column.Type_.GetDecoratedType();
if ColumnType is TRecordType then
begin
RecordType := ColumnType as TRecordType;
ExpandedColumns := ExpandTableColumn(Column);
Values := TObjectList<TSqlExpression>.Create();
Values.ElementManager := TReferenceCounter<TSqlExpression>.Create();
if Value is TSqlRow then
begin
Row := Value as TSqlRow;
Values.AddAll(Row.Columns);
end
else if Value is TSqlNull then
begin
for j := 1 to RecordType.Members.Count do
Values.Add(TSqlNull.Create());
end
else
raise EHierarchicalSqlDatabase.Create('Unknown value for structured column');
for j := 0 to RecordType.Members.Count - 1 do
ExpandedUpdate.Assignments.Add(TSqlAssign.Create(ExpandedColumns[j], Values[j]));
ExpandedColumns.Free();
Values.Free();
end
else
ExpandedUpdate.Assignments.Add(Assignment);
end;
Database.Query(ExpandedUpdate);
end;
function THierarchicalSqlDatabase.Query(Statement: TSqlStatement; ResultMethod: TSqlQueryResultMethod): TSqlResult;
begin
Statement.AddReference();
try
if Statement is TSqlSelect then
Result := HandleSelect(Statement as TSqlSelect, ResultMethod)
else if Statement is TSqlInsertStatement then
begin
Result := nil;
HandleInsert(Statement as TSqlInsertStatement);
end
else if Statement is TSqlUpdate then
begin
Result := nil;
HandleUpdate(Statement as TSqlUpdate);
end
else if Statement is TSqlDelete then
begin
Result := nil;
HandleDelete(Statement as TSqlDelete);
end
else if Statement is TSqlCreateTable then
begin
Result := nil;
HandleCreateTable(Statement as TSqlCreateTable);
end
else
Result := inherited Query(Statement, ResultMethod);
finally
Statement.ReleaseReference();
end;
end;
function THierarchicalSqlDatabase.ShouldExpandTableExpression(TableExpression: TSqlTableExpression): TBoolean;
var
Statement: TSqlStatement;
begin
Result := False;
if TableExpression is TSqlResultSetStatementTableExpression then
begin
Statement := (TableExpression as TSqlResultSetStatementTableExpression).Statement;
if Statement is TSqlSelect then
Result := True; // TODO: This could be a TSqlUnion as well
end
else if TableExpression is TSqlDecoratingTableExpression then
Result := ShouldExpandTableExpression((TableExpression as TSqlDecoratingTableExpression).DecoratedExpression);
end;
function THierarchicalSqlDatabase.ShouldExpandTableExpressions(TableExpressions: TList<TSqlTableExpression>): TBoolean;
var
i: TInteger32;
begin
Result := False;
i := 0;
while not Result and (i < TableExpressions.Count) do
begin
Result := ShouldExpandTableExpression(TableExpressions[i]);
Inc(i);
end;
end;
function THierarchicalSqlDatabase.ShouldExpandDelete(Delete: TSqlDelete): TBoolean;
begin
Result := ShouldExpandTableExpressions(Delete.ReferenceTables);
end;
function THierarchicalSqlDatabase.ShouldExpandInsert(Insert: TSqlInsertStatement): TBoolean;
var
i: TInteger32;
Columns: TList<TSqlTableColumn>;
begin
Columns := Insert.Columns;
Result := False;
i := 0;
while not Result and (i < Columns.Count) do
begin
Result := Columns[i].Type_.GetDecoratedType() is TStructuredType;
Inc(i);
end;
end;
function THierarchicalSqlDatabase.ShouldExpandUpdate(Update: TSqlUpdate): TBoolean;
var
i: TInteger32;
Assignments: TList<TSqlAssign>;
Assignment: TSqlAssign;
Type_: TType;
begin
Assignments := Update.Assignments;
Result := False;
i := 0;
while not Result and (i < Assignments.Count) do
begin
Assignment := Assignments[i];
Type_ := Assignment.Column.Type_.GetDecoratedType();
Result := Type_ is TRecordType;
Inc(i);
end;
Result := Result or ShouldExpandTableExpressions(Update.Tables);
end;
{ TRecordSetColumn }
destructor TRecordSetColumn.Destroy();
begin
Column.ReleaseReference();
Subtable.Free();
inherited Destroy();
end;
procedure TRecordSetColumn.SetColumn(const Value: TSqlTableColumn);
begin
if Value <> Column then
begin
Value.AddReference();
Column.ReleaseReference();
FColumn := Value;
end;
end;
{ THierarchicalSqlResult }
constructor THierarchicalSqlResult.Create(DecoratedResult: TSqlResult; Database: TSqlDatabase; RecordSetColumns: TObjectList<TRecordSetColumn>);
begin
inherited Create(DecoratedResult);
Self.Database := Database;
Self.RecordSetColumns := RecordSetColumns;
end;
destructor THierarchicalSqlResult.Destroy();
begin
RecordSetColumns.Free();
inherited Destroy();
end;
function THierarchicalSqlResult.FetchRow(): TBoolean;
begin
Result := inherited FetchRow();
RecordSetField := 0;
end;
function THierarchicalSqlResult.ReadRecordSet(): TRecordSet;
var
RecordSetColumn: TRecordSetColumn;
RecordSetType: TRecordSetType;
Record_: TRecord;
RecordType: TRecordType;
ValueType: TType;
Identifier: TInteger;
SqlResult: TSqlResult;
Select: TSqlSelect;
i: TInteger32;
Value: TValue;
begin
RecordSetColumn := RecordSetColumns[RecordSetField];
RecordSetType := RecordSetColumn.Column.Type_.GetDecoratedType() as TRecordSetType;
RecordType := RecordSetType.RecordType;
Result := TRecordSet.Create(RecordSetType);
Identifier := DecoratedResult.ReadInteger(); // TODO: We now assume a single column Integer primary key, this should be generalized
Select := TSqlSelect.Create();
Select.From.Add(RecordSetColumn.Subtable.ToExpression());
Select.Restrictions.Add(TSqlEqual.Create(TSqlTableColumnReference.Create(RecordSetColumn.Subtable.Columns[0]), TSqlLiteralInteger.Create(Identifier))); // TODO: We assume a Parent.ID column here
for i := 1 to RecordSetColumn.Subtable.Columns.Count - 1 do
Select.Columns.AddTableColumn(RecordSetColumn.Subtable.Columns[i]);
SqlResult := Database.Query(Select);
while SqlResult.FetchRow() do
begin
Record_ := TRecord.Create(RecordType);
for i := 0 to RecordType.Members.Count - 1 do
begin
ValueType := RecordType.Members[i].Type_;
if SqlResult.ReadNull() then
Value := TUnknown.Create()
else
begin
if ValueType is TCurrencyType then
Value := TCurrencyValue.Create(SqlResult.ReadDecimal())
else
Value := TTextValue.Create(SqlResult.ReadText());
end;
Record_.Values.Add(Value);
end;
Result.Add(Record_);
end;
SqlResult.Free();
Inc(RecordSetField);
end;
end.
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