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SynOleDB.pas
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SynOleDB.pas
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/// fast OleDB direct access classes
// - this unit is a part of the freeware Synopse framework,
// licensed under a MPL/GPL/LGPL tri-license; version 1.18
unit SynOleDB;
{
This file is part of Synopse framework.
Synopse framework. Copyright (C) 2019 Arnaud Bouchez
Synopse Informatique - https://synopse.info
*** BEGIN LICENSE BLOCK *****
Version: MPL 1.1/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Mozilla Public License Version
1.1 (the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL
Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
for the specific language governing rights and limitations under the License.
The Original Code is Synopse mORMot framework.
The Initial Developer of the Original Code is Arnaud Bouchez.
Portions created by the Initial Developer are Copyright (C) 2019
the Initial Developer. All Rights Reserved.
Contributor(s):
- Esteban Martin (EMartin)
- Pavel (mpv)
Alternatively, the contents of this file may be used under the terms of
either the GNU General Public License Version 2 or later (the "GPL"), or
the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the MPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the MPL, the GPL or the LGPL.
***** END LICENSE BLOCK *****
Several implementation notes about Oracle and OleDB:
- Oracle OleDB provider by Microsoft do not handle BLOBs. Period. :(
- Oracle OleDB provider by Oracle will handle only 3/4 BLOBs. :(
See https://stackoverflow.com/a/6640101
- Oracle OleDB provider by Oracle or Microsoft could trigger some ORA-80040e4B
error when accessing column data with very low dates value (like 0001-01-01)
- in all cases, that's why we wrote the SynDBOracle unit, for direct OCI
access - and it is from 2 to 10 times faster than OleDB, with no setup issue
- or take a look at latest patches from Oracle support, and pray it's fixed ;)
https://stackoverflow.com/a/6661058
Version 1.14
- first public release, corresponding to SQLite3 Framework 1.14
Version 1.15
- SynDB unit extracted from previous SynOleDB.pas
- several fixes and speed enhancements
- made the code compatible with Delphi 5
- TOleDBStatement class now follows the prepared statement pattern introduced
with its parent TSQLDBStatement
- now able to retrieve table names and column information from OleDB metadata
including GetTableNames, GetFields, GetFieldDefinitions and GetForeignKey
methods - able to use faster direct SQL retrieval (e.g. for Oracle / MS SQL)
Version 1.16
- add some reference to https://synopse.info/fossil/tktview?name=213544b2f5
in case of wrong implementation of multi-thread connection (within the
THttpServerGeneric mORMot server, for instance)
Version 1.17
- fix issue (depending on OleDB Provider) about ordinal binding error
- fix issue about void string parameter binding
- fix issue in TOleDBStatement.BindCurrency() method
- fix retrieval of table and field metadata, for tables without schema
(e.g. Jet/MSAccess database)
- added TOleDBJetConnectionProperties kind of connection to direct
access of Microsoft Jet databases (.mdb files)
- added corresponding IsJetFile() function
- added FieldSize optional parameter to TOleDBStatement.ColumnType()
method (used e.g. by SynDBVCL to provide the expected field size on TDataSet)
- added TOleDBConnectionProperties.CreateDatabase able to create a database
from the supplied connection string (used e.g. to initialize .mdb files)
- code refactoring, especially about error handling and ODBC integration
- CoInit and CoUninit made public for user convenience, e.g. when using
custom COM objects in a mORMot multi-thread servers
Version 1.18
- SQL statements with no results will now be cached to increase speed
- TOleDBMSSQLConnectionProperties provider changed to more stable SQLNCLI10
- added TOleDBMSSQL2005ConnectionProperties, TOleDBMSSQL2008ConnectionProperties
and TOleDBMSSQL2012ConnectionProperties classes to specify every available
MS SQL Server providers SQLNCLI, SQLNCLI10 or SQLNCLI11
- now trim any spaces when retrieving database schema text values
- added TOleDBStatement.UpdateCount overridden method (dc proposal)
- fixed ticket [4c68975022] about broken SQL statement when logging active
- fixed ticket [a24cbd30e3] about 64 bit compilation
- now works as expected under Win64 (a lot of previous code was Win32 specific)
- fixed issue when binding NULL parameters with some DB providers (e.g. Jet)
- fixed issue in TOleDBConnectionProperties.ColumnTypeNativeToDB() about
unrecognized column type when table schema is retrieved from SQL
- fixed issue when running TOleDBStatement.Step(true)
- fixed issue [e8c211062e] when binding NULL values in multi INSERT statements
- exception during Commit should leave transaction state - see [ca035b8f0da]
- fixed logging SQL content of external OleDB statements
- added TOleDBStatement.BindArray for `array of Int64` & `array of RawUFT8`
binding for `select` statements( via additional TABLE variable)
- added TOleDBInformixConnectionProperties - by EMartin
}
{$I Synopse.inc} // define HASINLINE USETYPEINFO CPU32 CPU64 OWNNORMTOUPPER
interface
uses
Windows,
{$ifdef ISDELPHIXE2}System.Win.ComObj,{$else}ComObj,{$endif}
ActiveX,
SysUtils,
{$ifndef DELPHI5OROLDER}
Variants,
{$endif}
Classes,
Contnrs,
SynCommons,
SynLog,
SynTable,
SynDB;
{ -------------- OleDB interfaces, constants and types
(OleDB.pas is not provided e.g. in Delphi 7 Personal) }
const
IID_IUnknown: TGUID = '{00000000-0000-0000-C000-000000000046}';
IID_IAccessor: TGUID = '{0C733A8C-2A1C-11CE-ADE5-00AA0044773D}';
IID_IRowset: TGUID = '{0C733A7C-2A1C-11CE-ADE5-00AA0044773D}';
IID_IMultipleResults: TGUID = '{0C733A90-2A1C-11CE-ADE5-00AA0044773D}';
IID_IOpenRowset: TGUID = '{0C733A69-2A1C-11CE-ADE5-00AA0044773D}';
IID_IDataInitialize: TGUID = '{2206CCB1-19C1-11D1-89E0-00C04FD7A829}';
IID_IDBInitialize: TGUID = '{0C733A8B-2A1C-11CE-ADE5-00AA0044773D}';
IID_ICommandText: TGUID = '{0C733A27-2A1C-11CE-ADE5-00AA0044773D}';
IID_ISSCommandWithParameters: TGUID = '{EEC30162-6087-467C-B995-7C523CE96561}';
IID_ITransactionLocal: TGUID = '{0C733A5F-2A1C-11CE-ADE5-00AA0044773D}';
IID_IDBPromptInitialize: TGUID = '{2206CCB0-19C1-11D1-89E0-00C04FD7A829}';
CLSID_DATALINKS: TGUID = '{2206CDB2-19C1-11D1-89E0-00C04FD7A829}';
CLSID_MSDAINITIALIZE: TGUID = '{2206CDB0-19C1-11D1-89E0-00C04FD7A829}';
CLSID_ROWSET_TVP: TGUID = '{C7EF28D5-7BEE-443F-86DA-E3984FCD4DF9}';
DB_NULLGUID: TGuid = '{00000000-0000-0000-0000-000000000000}';
DBGUID_DEFAULT: TGUID = '{C8B521FB-5CF3-11CE-ADE5-00AA0044773D}';
DBSCHEMA_TABLES: TGUID = '{C8B52229-5CF3-11CE-ADE5-00AA0044773D}';
DBSCHEMA_COLUMNS: TGUID = '{C8B52214-5CF3-11CE-ADE5-00AA0044773D}';
DBSCHEMA_INDEXES: TGUID = '{C8B5221E-5CF3-11CE-ADE5-00AA0044773D}';
DBSCHEMA_FOREIGN_KEYS: TGUID = '{C8B522C4-5CF3-11CE-ADE5-00AA0044773D}';
DBPROPSET_SQLSERVERPARAMETER: TGUID = '{FEE09128-A67D-47EA-8D40-24A1D4737E8D}';
// PropIds for DBPROPSET_SQLSERVERPARAMETER
SSPROP_PARAM_XML_SCHEMACOLLECTION_CATALOGNAME = 24;
SSPROP_PARAM_XML_SCHEMACOLLECTION_SCHEMANAME = 25;
SSPROP_PARAM_XML_SCHEMACOLLECTIONNAME = 26;
SSPROP_PARAM_UDT_CATALOGNAME = 27;
SSPROP_PARAM_UDT_SCHEMANAME = 28;
SSPROP_PARAM_UDT_NAME = 29;
SSPROP_PARAM_TYPE_CATALOGNAME = 38;
SSPROP_PARAM_TYPE_SCHEMANAME = 39;
SSPROP_PARAM_TYPE_TYPENAME = 40;
SSPROP_PARAM_TABLE_DEFAULT_COLUMNS = 41;
SSPROP_PARAM_TABLE_COLUMN_SORT_ORDER = 42;
DBTYPE_EMPTY = $00000000;
DBTYPE_NULL = $00000001;
DBTYPE_I2 = $00000002;
DBTYPE_I4 = $00000003;
DBTYPE_R4 = $00000004;
DBTYPE_R8 = $00000005;
DBTYPE_CY = $00000006;
DBTYPE_DATE = $00000007;
DBTYPE_BSTR = $00000008;
DBTYPE_IDISPATCH = $00000009;
DBTYPE_ERROR = $0000000A;
DBTYPE_BOOL = $0000000B;
DBTYPE_VARIANT = $0000000C;
DBTYPE_IUNKNOWN = $0000000D;
DBTYPE_DECIMAL = $0000000E;
DBTYPE_UI1 = $00000011;
DBTYPE_ARRAY = $00002000;
DBTYPE_BYREF = $00004000;
DBTYPE_I1 = $00000010;
DBTYPE_UI2 = $00000012;
DBTYPE_UI4 = $00000013;
DBTYPE_I8 = $00000014;
DBTYPE_UI8 = $00000015;
DBTYPE_GUID = $00000048;
DBTYPE_VECTOR = $00001000;
DBTYPE_RESERVED = $00008000;
DBTYPE_BYTES = $00000080;
DBTYPE_STR = $00000081;
DBTYPE_WSTR = $00000082;
DBTYPE_NUMERIC = $00000083;
DBTYPE_UDT = $00000084;
DBTYPE_DBDATE = $00000085;
DBTYPE_DBTIME = $00000086;
DBTYPE_DBTIMESTAMP = $00000087;
DBTYPE_FILETIME = $00000040;
DBTYPE_DBFILETIME = $00000089;
DBTYPE_PROPVARIANT = $0000008A;
DBTYPE_VARNUMERIC = $0000008B;
DBTYPE_TABLE = $0000008F; // introduced in SQL 2008
DBPARAMIO_NOTPARAM = $00000000;
DBPARAMIO_INPUT = $00000001;
DBPARAMIO_OUTPUT = $00000002;
DBPARAMFLAGS_ISINPUT = $00000001;
DBPARAMFLAGS_ISOUTPUT = $00000002;
DBPARAMFLAGS_ISSIGNED = $00000010;
DBPARAMFLAGS_ISNULLABLE = $00000040;
DBPARAMFLAGS_ISLONG = $00000080;
DBPART_VALUE = $00000001;
DBPART_LENGTH = $00000002;
DBPART_STATUS = $00000004;
DBMEMOWNER_CLIENTOWNED = $00000000;
DBMEMOWNER_PROVIDEROWNED = $00000001;
DBACCESSOR_ROWDATA = $00000002;
DBACCESSOR_PARAMETERDATA = $00000004;
DBACCESSOR_OPTIMIZED = $00000008;
DB_E_CANCELED = HResult($80040E4E);
DB_E_NOTSUPPORTED = HResult($80040E53);
DBCOLUMNFLAGS_MAYBENULL = $00000040;
ISOLATIONLEVEL_READCOMMITTED = $00001000;
DBPROMPTOPTIONS_PROPERTYSHEET = $2;
DB_NULL_HCHAPTER = $00;
DB_S_ENDOFROWSET = $00040EC6;
XACTTC_SYNC = $00000002;
MAXBOUND = 65535; { High bound for arrays }
DBKIND_GUID_NAME = 0;
DBKIND_GUID_PROPID = ( DBKIND_GUID_NAME + 1 );
DBKIND_NAME = ( DBKIND_GUID_PROPID + 1 );
DBKIND_PGUID_NAME = ( DBKIND_NAME + 1 );
DBKIND_PGUID_PROPID = ( DBKIND_PGUID_NAME + 1 );
DBKIND_PROPID = ( DBKIND_PGUID_PROPID + 1 );
DBKIND_GUID = ( DBKIND_PROPID + 1 );
type
/// indicates whether the data value or some other value, such as a NULL,
// is to be used as the value of the column or parameter
// - see http://msdn.microsoft.com/en-us/library/ms722617
// and http://msdn.microsoft.com/en-us/library/windows/desktop/ms716934
TOleDBStatus = (
stOK, stBadAccessor, stCanNotConvertValue, stIsNull, stTruncated,
stSignMismatch, stDataoverFlow, stCanNotCreateValue, stUnavailable,
stPermissionDenied, stIntegrityViolation, stSchemaViolation, stBadStatus,
stDefault, stCellEmpty, stIgnoreColumn, stDoesNotExist, stInvalidURL,
stResourceLocked, stResoruceExists, stCannotComplete, stVolumeNotFound,
stOutOfSpace, stCannotDeleteSource, stAlreadyExists, stCanceled,
stNotCollection, stRowSetColumn);
/// binding status of a given column
// - see http://msdn.microsoft.com/en-us/library/windows/desktop/ms720969
// and http://msdn.microsoft.com/en-us/library/windows/desktop/ms716934
TOleDBBindStatus = (
bsOK, bsBadOrdinal, bsUnsupportedConversion, bsBadBindInfo,
bsBadStorageFlags, bsNoInterface, bsMultipleStorage);
PIUnknown = ^IUnknown;
HACCESSOR = PtrUInt;
HACCESSORDynArray = array of HACCESSOR;
HCHAPTER = PtrUInt;
HROW = PtrUInt;
PHROW = ^HROW;
DBPART = UINT;
DBMEMOWNER = UINT;
DBPARAMIO = UINT;
DBPROPSTATUS = UINT;
DBPROPID = UINT;
DBPROPOPTIONS = UINT;
DBCOLUMNFLAGS = UINT;
DBKIND = UINT;
DBSTATUS = DWORD;
DBPARAMFLAGS = DWORD;
DBTYPE = Word;
DBRESULTFLAG = UINT;
DBLENGTH = PtrUInt;
DB_UPARAMS = PtrUInt;
DBORDINAL = PtrUInt;
PBoid = ^TBoid;
{$ifdef CPU64}
{$A8} // un-packed records
{$else}
{$A-} // packed records
{$endif}
TBoid = record
rgb_: array[0..15] of Byte;
end;
TXactOpt = record
ulTimeout: UINT;
szDescription: array[0..39] of Shortint;
end;
TXactTransInfo = record
uow: PBoid;
isoLevel: Integer;
isoFlags: UINT;
grfTCSupported: UINT;
grfRMSupported: UINT;
grfTCSupportedRetaining: UINT;
grfRMSupportedRetaining: UINT;
end;
PErrorInfo = ^TErrorInfo;
TErrorInfo = record
hrError: HResult;
dwMinor: UINT;
clsid: TGUID;
iid: TGUID;
dispid: Integer;
end;
PDBParams = ^TDBParams;
TDBParams = record
pData: Pointer;
cParamSets: PtrUInt;
HACCESSOR: HACCESSOR;
end;
PDBObject = ^TDBObject;
TDBObject = record
dwFlags: UINT;
iid: TGUID;
end;
PDBBindExt = ^TDBBindExt;
TDBBindExt = record
pExtension: PByte;
ulExtension: PtrUInt;
end;
PDBBinding = ^TDBBinding;
TDBBinding = record
iOrdinal: DBORDINAL;
obValue: PtrUInt;
obLength: PtrUInt;
obStatus: PtrUInt;
pTypeInfo: ITypeInfo;
pObject: PDBObject;
pBindExt: PDBBindExt;
dwPart: DBPART;
dwMemOwner: DBMEMOWNER;
eParamIO: DBPARAMIO;
cbMaxLen: PtrUInt;
dwFlags: UINT;
wType: DBTYPE;
bPrecision: Byte;
bScale: Byte;
end;
PDBBindingArray = ^TDBBindingArray;
TDBBindingArray = array[0..MAXBOUND] of TDBBinding;
TDBBindingDynArray = array of TDBBinding;
DBIDGUID = record
case Integer of
0: (guid: TGUID);
1: (pguid: ^TGUID);
end;
DBIDNAME = record
case Integer of
0: (pwszName: PWideChar);
1: (ulPropid: UINT);
end;
PDBID = ^DBID;
DBID = record
uGuid: DBIDGUID;
eKind: DBKIND;
uName: DBIDNAME;
end;
PDBIDArray = ^TDBIDArray;
TDBIDArray = array[0..MAXBOUND] of DBID;
PDBColumnInfo = ^TDBColumnInfo;
TDBColumnInfo = record
pwszName: PWideChar;
pTypeInfo: ITypeInfo;
iOrdinal: DBORDINAL;
dwFlags: DBCOLUMNFLAGS;
ulColumnSize: PtrUInt;
wType: DBTYPE;
bPrecision: Byte;
bScale: Byte;
columnid: DBID;
end;
DBSOURCETYPE = DWORD;
PDBSOURCETYPE = ^DBSOURCETYPE;
TDBProp = record
dwPropertyID: DBPROPID;
dwOptions: DBPROPOPTIONS;
dwStatus: DBPROPSTATUS;
colid: DBID;
vValue: OleVariant;
end;
PDBPropArray = ^TDBPropArray;
TDBPropArray = array[0..MAXBOUND] of TDBProp;
TDBPropSet = record
rgProperties: PDBPropArray;
cProperties: UINT;
guidPropertySet: TGUID;
end;
PDBPropSet = ^TDBPropSet;
PDBPropSetArray = ^TDBPropSetArray;
TDBPropSetArray = array[0..MAXBOUND] of TDBPropSet;
TDBSchemaRec = record
SchemaGuid: TGuid;
SupportedRestrictions: Integer;
end;
TSSPARAMPROPS = record
iOrdinal: DBORDINAL;
cPropertySets: ULONG;
rgPropertySets: PDBPropSet;
end;
PSSPARAMPROPS = ^TSSPARAMPROPS;
PSSPARAMPROPSArray = ^TSSPARAMPROPSArray;
TSSPARAMPROPSArray = array[0..MAXBOUND] of TSSPARAMPROPS;
TSSPARAMPROPSDynArray = array of TSSPARAMPROPS;
PDBParamInfo = ^TDBParamInfo;
DBPARAMINFO = record
dwFlags: UINT;
iOrdinal: DBORDINAL;
pwszName: PWideChar;
pTypeInfo: ITypeInfo;
ulParamSize: DBLENGTH;
wType: DBTYPE;
bPrecision: Byte;
bScale: Byte;
end;
TDBParamInfo = DBPARAMINFO;
PUintArray = ^TUintArray;
TUintArray = array[0..MAXBOUND] of UINT;
TUintDynArray = array of UINT;
PDBParamBindInfo = ^TDBParamBindInfo;
DBPARAMBINDINFO = record
pwszDataSourceType: PWideChar;
pwszName: PWideChar;
ulParamSize: DBLENGTH;
dwFlags: DBPARAMFLAGS;
bPrecision: Byte;
bScale: Byte;
end;
TDBParamBindInfo = DBPARAMBINDINFO;
PDBParamBindInfoArray = ^TDBParamBindInfoArray;
TDBParamBindInfoArray = array[0..MAXBOUND] of TDBParamBindInfo;
TDBParamBindInfoDynArray = array of TDBParamBindInfo;
{$ifndef CPU64}
{$A-} // packed records
{$endif}
/// initialize and uninitialize OleDB data source objects and enumerators
IDBInitialize = interface(IUnknown)
['{0C733A8B-2A1C-11CE-ADE5-00AA0044773D}']
function Initialize: HResult; stdcall;
function Uninitialize: HResult; stdcall;
end;
/// create an OleDB data source object using a connection string
IDataInitialize = interface(IUnknown)
['{2206CCB1-19C1-11D1-89E0-00C04FD7A829}']
function GetDataSource(const pUnkOuter: IUnknown; dwClsCtx: DWORD;
pwszInitializationString: POleStr; const riid: TIID;
var DataSource: IUnknown): HResult; stdcall;
function GetInitializationString(const DataSource: IUnknown;
fIncludePassword: Boolean; out pwszInitString: POleStr): HResult; stdcall;
function CreateDBInstance(const clsidProvider: TGUID;
const pUnkOuter: IUnknown; dwClsCtx: DWORD; pwszReserved: POleStr;
riid: TIID; var DataSource: IUnknown): HResult; stdcall;
function CreateDBInstanceEx(const clsidProvider: TGUID;
const pUnkOuter: IUnknown; dwClsCtx: DWORD; pwszReserved: POleStr;
pServerInfo: PCoServerInfo; cmq: ULONG; rgmqResults: PMultiQI): HResult; stdcall;
function LoadStringFromStorage(pwszFileName: POleStr;
out pwszInitializationString: POleStr): HResult; stdcall;
function WriteStringToStorage(pwszFileName, pwszInitializationString: POleStr;
dwCreationDisposition: DWORD): HResult; stdcall;
end;
/// obtain a new session to a given OleDB data source
IDBCreateSession = interface(IUnknown)
['{0C733A5D-2A1C-11CE-ADE5-00AA0044773D}']
function CreateSession(const punkOuter: IUnknown; const riid: TGUID;
out ppDBSession: IUnknown): HResult; stdcall;
end;
/// commit, abort, and obtain status information about OleDB transactions
ITransaction = interface(IUnknown)
['{0FB15084-AF41-11CE-BD2B-204C4F4F5020}']
function Commit(fRetaining: BOOL; grfTC: UINT; grfRM: UINT): HResult; stdcall;
function Abort(pboidReason: PBOID; fRetaining: BOOL; fAsync: BOOL): HResult; stdcall;
function GetTransactionInfo(out pinfo: TXactTransInfo): HResult; stdcall;
end;
/// gets and sets a suite of options associated with an OleDB transaction
ITransactionOptions = interface(IUnknown)
['{3A6AD9E0-23B9-11CF-AD60-00AA00A74CCD}']
function SetOptions(var pOptions: TXactOpt): HResult; stdcall;
function GetOptions(var pOptions: TXactOpt): HResult; stdcall;
end;
/// optional interface on OleDB sessions, used to start, commit, and abort
// transactions on the session
ITransactionLocal = interface(ITransaction)
['{0C733A5F-2A1C-11CE-ADE5-00AA0044773D}']
function GetOptionsObject(out ppOptions: ITransactionOptions): HResult; stdcall;
function StartTransaction(isoLevel: Integer; isoFlags: UINT;
const pOtherOptions: ITransactionOptions; pulTransactionLevel: PUINT): HResult; stdcall;
end;
/// provide methods to execute commands
ICommand = interface(IUnknown)
['{0C733A63-2A1C-11CE-ADE5-00AA0044773D}']
function Cancel: HResult; stdcall;
function Execute(const punkOuter: IUnknown; const riid: TGUID; var pParams: TDBParams;
pcRowsAffected: PInteger; ppRowset: PIUnknown): HResult; stdcall;
function GetDBSession(const riid: TGUID; out ppSession: IUnknown): HResult; stdcall;
end;
/// methods to access the ICommand text to be executed
ICommandText = interface(ICommand)
['{0C733A27-2A1C-11CE-ADE5-00AA0044773D}']
function GetCommandText(var pguidDialect: TGUID;
out ppwszCommand: PWideChar): HResult; stdcall;
function SetCommandText(const guidDialect: TGUID;
pwszCommand: PWideChar): HResult; stdcall;
end;
ICommandWithParameters = interface(IUnknown)
['{0C733A64-2A1C-11CE-ADE5-00AA0044773D}']
function GetParameterInfo(var pcParams: UINT; out prgParamInfo: PDBPARAMINFO;
ppNamesBuffer: PPOleStr): HResult; stdcall;
function MapParameterNames(cParamNames: DB_UPARAMS; rgParamNames: POleStrList;
rgParamOrdinals: PPtrUIntArray): HResult; stdcall;
function SetParameterInfo(cParams: DB_UPARAMS; rgParamOrdinals: PPtrUIntArray;
rgParamBindInfo: PDBParamBindInfoArray): HResult; stdcall;
end;
ISSCommandWithParameters = interface(ICommandWithParameters)
['{EEC30162-6087-467C-B995-7C523CE96561}']
function GetParameterProperties(var pcParams: PtrUInt; var prgParamProperties: PSSPARAMPROPS): HResult; stdcall;
function SetParameterProperties (cParams: PtrUInt; prgParamProperties: PSSPARAMPROPS): HResult; stdcall;
end;
/// provides methods for fetching rows sequentially, getting the data from
// those rows, and managing rows
IRowset = interface(IUnknown)
['{0C733A7C-2A1C-11CE-ADE5-00AA0044773D}']
/// Adds a reference count to an existing row handle
function AddRefRows(cRows: PtrUInt; rghRows: PPtrUIntArray;
rgRefCounts, rgRowStatus: PCardinalArray): HResult; stdcall;
/// Retrieves data from the rowset's copy of the row
function GetData(HROW: HROW; HACCESSOR: HACCESSOR; pData: Pointer): HResult; stdcall;
/// Fetches rows sequentially, remembering the previous position
// - this method has been modified from original OleDB.pas to allow direct
// typecast of prghRows parameter to pointer(fRowStepHandles)
function GetNextRows(hReserved: HCHAPTER; lRowsOffset: PtrInt; cRows: PtrInt;
out pcRowsObtained: PtrUInt; var prghRows: pointer): HResult; stdcall;
/// Releases rows
function ReleaseRows(cRows: UINT; rghRows: PPtrUIntArray; rgRowOptions,
rgRefCounts, rgRowStatus: PCardinalArray): HResult; stdcall;
/// Repositions the next fetch position to its initial position
// - that is, its position when the rowset was first created
function RestartPosition(hReserved: HCHAPTER): HResult; stdcall;
end;
IOpenRowset = interface(IUnknown)
['{0C733A69-2A1C-11CE-ADE5-00AA0044773D}']
function OpenRowset(const punkOuter: IUnknown; pTableID: PDBID; pIndexID: PDBID;
const riid: TGUID; cPropertySets: UINT; rgPropertySets: PDBPropSetArray;
ppRowset: PIUnknown): HResult; stdcall;
end;
IMultipleResults = interface(IUnknown)
['{0c733a8c-2a1c-11ce-ade5-00aa0044773d}']
function GetResult(const pUnkOuter: IUnknown; lResultFlag: DBRESULTFLAG;
const riid: TIID; pcRowsAffected: PInteger;ppRowset: PIUnknown): HResult; stdcall;
end;
/// interface used to retrieve enhanced custom error information
IErrorRecords = interface(IUnknown)
['{0c733a67-2a1c-11ce-ade5-00aa0044773d}']
function AddErrorRecord(pErrorInfo: PErrorInfo; dwLookupID: UINT;
pDispParams: pointer; const punkCustomError: IUnknown;
dwDynamicErrorID: UINT): HResult; stdcall;
function GetBasicErrorInfo(ulRecordNum: UINT;
pErrorInfo: PErrorInfo): HResult; stdcall;
function GetCustomErrorObject(ulRecordNum: UINT;
const riid: TGUID; var ppObject: IUnknown): HResult; stdcall;
function GetErrorInfo(ulRecordNum: UINT; lcid: LCID;
var ppErrorInfo: IErrorInfo): HResult; stdcall;
function GetErrorParameters(ulRecordNum: UINT;
pDispParams: pointer): HResult; stdcall;
function GetRecordCount(var pcRecords: UINT): HResult; stdcall;
end;
/// used on an OleDB session to obtain a new command
IDBCreateCommand = interface(IUnknown)
['{0C733A1D-2A1C-11CE-ADE5-00AA0044773D}']
function CreateCommand(const punkOuter: IUnknown; const riid: TGUID;
out ppCommand: ICommand): HResult; stdcall;
end;
/// provides methods for accessor management, to access OleDB data
// - An accessor is a data structure created by the consumer that describes
// how row or parameter data from the data store is to be laid out in the
// consumer's data buffer.
// - For each column in a row (or parameter in a set of parameters), the
// accessor contains a binding. A binding is a DBBinding data structure that
// holds information about a column or parameter value, such as its ordinal
// value, data type, and destination in the consumer's buffer.
IAccessor = interface(IUnknown)
['{0C733A8C-2A1C-11CE-ADE5-00AA0044773D}']
function AddRefAccessor(HACCESSOR: HACCESSOR; pcRefCount: PUINT): HResult; stdcall;
function CreateAccessor(dwAccessorFlags: UINT; cBindings: PtrUInt; rgBindings: PDBBindingArray;
cbRowSize: PtrUInt; var phAccessor: HACCESSOR; rgStatus: PCardinalArray): HResult; stdcall;
function GetBindings(HACCESSOR: HACCESSOR; pdwAccessorFlags: PUINT; var pcBindings: PtrUInt;
out prgBindings: PDBBinding): HResult; stdcall;
function ReleaseAccessor(HACCESSOR: HACCESSOR; pcRefCount: PUINT): HResult; stdcall;
end;
/// expose information about columns of an OleDB rowset or prepared command
IColumnsInfo = interface(IUnknown)
['{0C733A11-2A1C-11CE-ADE5-00AA0044773D}']
function GetColumnInfo(var pcColumns: PtrUInt; out prgInfo: PDBColumnInfo;
out ppStringsBuffer: PWideChar): HResult; stdcall;
function MapColumnIDs(cColumnIDs: PtrUInt; rgColumnIDs: PDBIDArray;
rgColumns: PPtrUIntArray): HResult; stdcall;
end;
/// allows the display of the data link dialog boxes programmatically
IDBPromptInitialize = interface(IUnknown)
['{2206CCB0-19C1-11D1-89E0-00C04FD7A829}']
function PromptDataSource(const pUnkOuter: IUnknown; hWndParent: HWND;
dwPromptOptions: UINT; cSourceTypeFilter: ULONG;
rgSourceTypeFilter: PDBSOURCETYPE; pszProviderFilter: POleStr;
const riid: TIID; var DataSource: IUnknown): HResult; stdcall;
function PromptFileName(hWndParent: HWND; dwPromptOptions: UINT;
pwszInitialDirectory, pwszInitialFile: POleStr;
var ppwszSelectedFile: POleStr): HResult; stdcall;
end;
/// used to retrieve the database metadata (e.g. tables and fields layout)
IDBSchemaRowset = interface(IUnknown)
['{0c733a7b-2a1c-11ce-ade5-00aa0044773d}']
function GetRowset(pUnkOuter: IUnknown; const rguidSchema: TGUID;
cRestrictions: Integer; rgRestrictions: pointer;
const riid: TIID; cPropertySets: Integer; rgPropertySets: PDBPROPSET;
var ppRowset: IRowset): HResult; stdcall;
function GetSchemas(var pcSchemas: Integer; var prgSchemas: PGUID;
var prgRestrictionSupport: PInteger): HResult; stdcall;
end;
{ -------------- TOleDB* OleDB classes and types }
type
/// generic Exception type, generated for OleDB connection
EOleDBException = class(ESQLDBException);
TOleDBConnection = class;
TOleDBOnCustomError = function(Connection: TOleDBConnection;
ErrorRecords: IErrorRecords; RecordNum: UINT): boolean of object;
/// will implement properties shared by OleDB connections
TOleDBConnectionProperties = class(TSQLDBConnectionPropertiesThreadSafe)
protected
fProviderName: RawUTF8;
fConnectionString: SynUnicode;
fOnCustomError: TOleDBOnCustomError;
fSchemaRec: array of TDBSchemaRec;
fSupportsOnlyIRowset: boolean;
function GetSchema(const aUID: TGUID; const Fields: array of RawUTF8;
var aResult: IRowSet): boolean;
/// will create the generic fConnectionString from supplied parameters
procedure SetInternalProperties; override;
/// initialize fForeignKeys content with all foreign keys of this DB
// - used by GetForeignKey method
procedure GetForeignKeys; override;
/// create the database
// - shall be called only if necessary (e.g. for file-based database, if
// the file does not exist yet)
function CreateDatabase: boolean; virtual;
public
/// create a new connection
// - call this method if the shared MainConnection is not enough (e.g. for
// multi-thread access)
// - the caller is responsible of freeing this instance
// - this overridden method will create an TOleDBConnection instance
function NewConnection: TSQLDBConnection; override;
/// display the OleDB/ADO Connection Settings dialog to customize the
// OleDB connection string
// - returns TRUE if the connection string has been modified
// - Parent is an optional GDI Window Handle for modal display
function ConnectionStringDialogExecute(Parent: HWND=0): boolean;
/// get all table names
// - will retrieve the corresponding metadata from OleDB interfaces if SQL
// direct access was not defined
procedure GetTableNames(out Tables: TRawUTF8DynArray); override;
/// retrieve the column/field layout of a specified table
// - will retrieve the corresponding metadata from OleDB interfaces if SQL
// direct access was not defined
procedure GetFields(const aTableName: RawUTF8; out Fields: TSQLDBColumnDefineDynArray); override;
/// convert a textual column data type, as retrieved e.g. from SQLGetField,
// into our internal primitive types
function ColumnTypeNativeToDB(const aNativeType: RawUTF8; aScale: integer): TSQLDBFieldType; override;
/// the associated OleDB connection string
// - is set by the Create() constructor most of the time from the supplied
// server name, user id and password, according to the database provider
// corresponding to the class
// - you may want to customize it via the ConnectionStringDialogExecute
// method, or to provide some additional parameters
property ConnectionString: SynUnicode read fConnectionString write fConnectionString;
/// custom Error handler for OleDB COM objects
// - returns TRUE if specific error was retrieved and has updated
// ErrorMessage and InfoMessage
// - default implementation just returns false
property OnCustomError: TOleDBOnCustomError read fOnCustomError write fOnCustomError;
published { to be loggged as JSON }
/// the associated OleDB provider name, as set for each class
property ProviderName: RawUTF8 read fProviderName;
end;
/// OleDB connection properties to an Oracle database using Oracle's Provider
// - this will use the native OleDB provider supplied by Oracle
// see @http://download.oracle.com/docs/cd/E11882_01/win.112/e17726/toc.htm
TOleDBOracleConnectionProperties = class(TOleDBConnectionProperties)
protected
/// will set the appropriate provider name, i.e. 'OraOLEDB.Oracle.1'
procedure SetInternalProperties; override;
end;
/// OleDB connection properties to an Oracle database using Microsoft's Provider
// - this will use the generic (older) OleDB provider supplied by Microsoft
// which would not be used any more:
// "This feature will be removed in a future version of Windows. Avoid
// using this feature in new development work, and plan to modify applications
// that currently use this feature. Instead, use Oracle's OLE DB provider."
// see http://msdn.microsoft.com/en-us/library/ms675851
TOleDBMSOracleConnectionProperties = class(TOleDBOracleConnectionProperties)
protected
/// will set the appropriate provider name, i.e. 'MSDAORA'
procedure SetInternalProperties; override;
end;
/// OleDB connection properties to Microsoft SQL Server 2008-2012, via
// SQL Server Native Client 10.0 (SQL Server 2008)
// - this will use the native OleDB provider supplied by Microsoft
// see http://msdn.microsoft.com/en-us/library/ms677227
// - is aUserID='' at Create, it will use Windows Integrated Security
// for the connection
// - will use the SQLNCLI10 provider, which will work on Windows XP;
// if you want all features, especially under MS SQL 2012, use the
// inherited class TOleDBMSSQL2012ConnectionProperties; if, on the other
// hand, you need to connect to a old MS SQL Server 2005, use
// TOleDBMSSQL2005ConnectionProperties, or set your own provider string
TOleDBMSSQLConnectionProperties = class(TOleDBConnectionProperties)
protected
/// will set the appropriate provider name, i.e. 'SQLNCLI10'
procedure SetInternalProperties; override;
/// custom Error handler for OleDB COM objects
// - will handle Microsoft SQL Server error messages (if any)
function MSOnCustomError(Connection: TOleDBConnection;
ErrorRecords: IErrorRecords; RecordNum: UINT): boolean;
public
end;
/// OleDB connection properties to Microsoft SQL Server 2005, via
// SQL Server Native Client (SQL Server 2005)
// - this overridden version will use the SQLNCLI provider, which is
// deprecated but may be an alternative with MS SQL Server 2005
// - is aUserID='' at Create, it will use Windows Integrated Security
// for the connection
TOleDBMSSQL2005ConnectionProperties = class(TOleDBMSSQLConnectionProperties)
protected
/// will set the appropriate provider name, i.e. 'SQLNCLI'
procedure SetInternalProperties; override;
public
/// initialize the connection properties
// - this overridden version will disable the MultipleValuesInsert()
// optimization as defined in TSQLDBConnectionProperties.Create(),
// since INSERT with multiple VALUES (..),(..),(..) is available only
// since SQL Server 2008
constructor Create(const aServerName, aDatabaseName, aUserID, aPassWord: RawUTF8); override;
end;
/// OleDB connection properties to Microsoft SQL Server 2008, via
// SQL Server Native Client 10.0 (SQL Server 2008)
// - just maps default TOleDBMSSQLConnectionProperties type
TOleDBMSSQL2008ConnectionProperties = TOleDBMSSQLConnectionProperties;
/// OleDB connection properties to Microsoft SQL Server 2008/2012, via
// SQL Server Native Client 11.0 (Microsoft SQL Server 2012 Native Client)
// - from http://www.microsoft.com/en-us/download/details.aspx?id=29065 get
// the sqlncli.msi package corresponding to your Operating System: note that
// the "X64 Package" will also install the 32-bit version of the client
// - this overridden version will use newer SQLNCLI11 provider, but won't work
// under Windows XP - in this case, it will fall back to SQLNCLI10 - see
// http://msdn.microsoft.com/en-us/library/ms131291
// - if aUserID='' at Create, it will use Windows Integrated Security
// for the connection
// - for SQL Express LocalDB edition, just use aServerName='(localdb)\v11.0'
TOleDBMSSQL2012ConnectionProperties = class(TOleDBMSSQLConnectionProperties)
protected
/// will set the appropriate provider name, i.e. 'SQLNCLI11'
// - will leave older 'SQLNCLI10' on Windows XP
procedure SetInternalProperties; override;
end;
/// OleDB connection properties to MySQL Server
TOleDBMySQLConnectionProperties = class(TOleDBConnectionProperties)
protected
/// will set the appropriate provider name, i.e. 'MySQLProv'
procedure SetInternalProperties; override;
end;
{$ifndef CPU64} // Jet is not available on Win64
/// OleDB connection properties to Jet/MSAccess .mdb files
// - the server name should be the .mdb file name
// - note that the Jet OleDB driver is not available under Win64 platform
TOleDBJetConnectionProperties = class(TOleDBConnectionProperties)
protected
/// will set the appropriate provider name, i.e. 'Microsoft.Jet.OLEDB.4.0'
procedure SetInternalProperties; override;
end;
{$endif}
/// OleDB connection properties to IBM AS/400
TOleDBAS400ConnectionProperties = class(TOleDBConnectionProperties)
protected
/// will set the appropriate provider name, i.e. 'IBMDA400.DataSource.1'
procedure SetInternalProperties; override;
end;
/// OleDB connection properties to Informix Server
TOleDBInformixConnectionProperties = class(TOleDBConnectionProperties)
protected
/// will set the appropriate provider name, i.e. 'Ifxoledbc'
procedure SetInternalProperties; override;
end;
/// OleDB connection properties via Microsoft Provider for ODBC
// - this will use the ODBC provider supplied by Microsoft
// see http://msdn.microsoft.com/en-us/library/ms675326(v=VS.85).aspx
// - an ODBC Driver should be specified at creation
// - you should better use direct connection classes, like
// TOleDBMSSQLConnectionProperties or TOleDBOracleConnectionProperties
// as defined in SynDBODBC.pas
TOleDBODBCSQLConnectionProperties = class(TOleDBConnectionProperties)
protected
fDriver: RawUTF8;
/// will set the appropriate provider name, i.e. 'MSDASQL'
procedure SetInternalProperties; override;
public
/// initialize the properties
// - an additional parameter is available to set the ODBC driver to use
// - you may also set aDriver='' and modify the connection string directly,
// e.g. adding '{ DSN=name | FileDSN=filename };'
constructor Create(const aDriver, aServerName, aDatabaseName,
aUserID, aPassWord: RawUTF8); reintroduce;
published { to be logged as JSON }
/// the associated ODBC Driver name, as specified at creation
property Driver: RawUTF8 read fDriver;
end;
/// implements an OleDB connection
// - will retrieve the remote DataBase behavior from a supplied
// TSQLDBConnectionProperties class, shared among connections
TOleDBConnection = class(TSQLDBConnectionThreadSafe)
protected
fMalloc: IMalloc;
fDBInitialize: IDBInitialize;
fTransaction: ITransactionLocal;
fSession: IUnknown;
fOleDBProperties: TOleDBConnectionProperties;
fOleDBErrorMessage, fOleDBInfoMessage: string;
/// Error handler for OleDB COM objects
// - will update ErrorMessage and InfoMessage
procedure OleDBCheck(aStmt: TSQLDBStatement; aResult: HRESULT;
const aStatus: TCardinalDynArray=nil); virtual;
/// called just after fDBInitialize.Initialized: could add parameters
procedure OnDBInitialized; virtual;
public
/// connect to a specified OleDB database
constructor Create(aProperties: TSQLDBConnectionProperties); override;
/// release all associated memory and OleDB COM objects
destructor Destroy; override;
/// initialize a new SQL query statement for the given connection
// - the caller should free the instance after use
function NewStatement: TSQLDBStatement; override;
/// connect to the specified database
// - should raise an EOleDBException on error
procedure Connect; override;
/// stop connection to the specified database
// - should raise an EOleDBException on error
procedure Disconnect; override;
/// return TRUE if Connect has been already successfully called
function IsConnected: boolean; override;
/// begin a Transaction for this connection
// - be aware that not all OleDB provider support nested transactions
// see http://msdn.microsoft.com/en-us/library/ms716985(v=vs.85).aspx
procedure StartTransaction; override;
/// commit changes of a Transaction for this connection
// - StartTransaction method must have been called before
procedure Commit; override;
/// discard changes of a Transaction for this connection
// - StartTransaction method must have been called before
procedure Rollback; override;
/// the associated OleDB database properties
property OleDBProperties: TOleDBConnectionProperties read fOleDBProperties;
/// internal error message, as retrieved from the OleDB provider
property OleDBErrorMessage: string read fOleDBErrorMessage;
/// internal information message, as retrieved from the OleDB provider
property OleDBInfoMessage: string read fOleDBInfoMessage;
end;
/// used to store properties and value about one TOleDBStatement Param
// - we don't use a Variant, not the standard TSQLDBParam record type,
// but manual storage for better performance
// - whole memory block of a TOleDBStatementParamDynArray will be used as the
// source Data for the OleDB parameters - so we should align data carefully
{$ifdef CPU64}
{$A8} // un-packed records
{$else}
{$A-} // packed records
{$endif}
TOleDBStatementParam = record
/// storage used for BLOB (ftBlob) values
// - will be refered as DBTYPE_BYREF when sent as OleDB parameters, to
// avoid unnecessary memory copy
VBlob: RawByteString;
/// storage used for TEXT (ftUTF8) values
// - we store TEXT here as WideString, and not RawUTF8, since OleDB
// expects the text to be provided with Unicode encoding
// - for some providers (like Microsoft SQL Server 2008 R2, AFAIK), using
// DBTYPE_WSTR value (i.e. what the doc. says) will raise an OLEDB Error
// 80040E1D (DB_E_UNSUPPORTEDCONVERSION, i.e. 'Requested conversion is not
// supported'): we found out that only DBTYPE_BSTR type (i.e. OLE WideString)
// does work... so we'll use it here! Shame on Microsoft!
// - what's fine with DBTYPE_BSTR is that it can be resized by the provider
// in case of VInOut in [paramOut, paramInOut] - so let it be
VText: WideString;
/// storage used for ftInt64, ftDouble, ftDate and ftCurrency value
VInt64: Int64;
/// storage used for table variables
VIUnknown: IUnknown;
/// storage used for table variables
VArray: TRawUTF8DynArray;
/// storage used for the OleDB status field
// - if VStatus=ord(stIsNull), then it will bind a NULL with the type
// as set by VType (to avoid conversion error like in [e8c211062e])
VStatus: integer;
/// the column/parameter Value type
VType: TSQLDBFieldType;
/// define if parameter can be retrieved after a stored procedure execution
VInOut: TSQLDBParamInOutType;
// so that VInt64 will be 8 bytes aligned
VFill: array[sizeof(TSQLDBFieldType)+sizeof(TSQLDBParamInOutType)+sizeof(integer)..
SizeOf(Int64)-1] of byte;
end;
{$ifdef CPU64}
{$A-} // packed records
{$endif}
POleDBStatementParam = ^TOleDBStatementParam;
/// used to store properties about TOleDBStatement Parameters
// - whole memory block of a TOleDBStatementParamDynArray will be used as the
// source Data for the OleDB parameters
TOleDBStatementParamDynArray = array of TOleDBStatementParam;
/// implements an OleDB SQL query statement
// - this statement won't retrieve all rows of data, but will allow direct
// per-row access using the Step() and Column*() methods
TOleDBStatement = class(TSQLDBStatement)
protected
fParams: TOleDBStatementParamDynArray;
fColumns: TSQLDBColumnPropertyDynArray;
fParam: TDynArray;
fColumn: TDynArrayHashed;
fCommand: ICommandText;
fRowSet: IRowSet;
fRowSetAccessor: HACCESSOR;
fRowSize: integer;
fRowStepResult: HRESULT;
fRowStepHandleRetrieved: PtrUInt;
fRowStepHandleCurrent: PtrUInt;
fRowStepHandles: TPtrUIntDynArray;
fRowSetData: array of byte;
fParamBindings: TDBBindingDynArray;
fColumnBindings: TDBBindingDynArray;
fHasColumnValueInlined: boolean;
fOleDBConnection: TOleDBConnection;
fDBParams: TDBParams;