f80b51ae44
Create a more effective implementation of XClob::length() and XClob::getSubString() methods, where string is read segment-by-segment instead of reading the whole underlying blob. That way it is possible to handle big texts which would not fit into memory. Also allow reading Clob data from a resultset with getString() and writing it in a prepared statement with setString(). Implement XPreparedStatement::setClob(). Also implement a private version of setClob() for creating a clob from OUString: Allow the creation of a clob column with GUI by adding a new type in ODataBaseMetaData::getTypeInfo(). Change-Id: Ibcbbdd80e8eed5e2a3fe55b0fa196401f1bcbcdf Reviewed-on: https://gerrit.libreoffice.org/47093 Reviewed-by: Tamás Bunth <btomi96@gmail.com> Tested-by: Tamás Bunth <btomi96@gmail.com>
104 lines
3.8 KiB
C++
104 lines
3.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef INCLUDED_CONNECTIVITY_SOURCE_DRIVERS_FIREBIRD_BLOB_HXX
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#define INCLUDED_CONNECTIVITY_SOURCE_DRIVERS_FIREBIRD_BLOB_HXX
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#include <ibase.h>
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#include <cppuhelper/compbase.hxx>
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#include <com/sun/star/io/XInputStream.hpp>
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#include <com/sun/star/sdbc/XBlob.hpp>
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namespace connectivity
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{
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namespace firebird
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{
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typedef ::cppu::WeakComponentImplHelper< css::sdbc::XBlob,
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css::io::XInputStream >
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Blob_BASE;
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class Blob :
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public Blob_BASE
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{
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protected:
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::osl::Mutex m_aMutex;
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isc_db_handle* m_pDatabaseHandle;
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isc_tr_handle* m_pTransactionHandle;
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// We store our own copy of the blob id as typically the statement
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// manages its own blob id, and blobs are independent of a statement
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// in firebird.
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ISC_QUAD m_blobID;
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isc_blob_handle m_blobHandle;
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bool m_bBlobOpened;
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sal_Int64 m_nBlobLength;
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sal_uInt16 m_nMaxSegmentSize;
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sal_Int64 m_nBlobPosition;
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ISC_STATUS_ARRAY m_statusVector;
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/// @throws css::sdbc::SQLException
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void ensureBlobIsOpened();
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/**
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* Closes the blob and cleans up resources -- can be used to reset
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* the blob if we e.g. want to read from the beginning again.
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*
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* @throws css::sdbc::SQLException
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*/
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void closeBlob();
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sal_uInt16 getMaximumSegmentSize();
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public:
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Blob(isc_db_handle* pDatabaseHandle,
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isc_tr_handle* pTransactionHandle,
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ISC_QUAD const & aBlobID);
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bool readOneSegment(css::uno::Sequence< sal_Int8 >& rDataOut);
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// ---- XBlob ----------------------------------------------------
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virtual sal_Int64 SAL_CALL
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length() override;
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virtual css::uno::Sequence< sal_Int8 > SAL_CALL
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getBytes(sal_Int64 aPosition, sal_Int32 aLength) override;
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virtual css::uno::Reference< css::io::XInputStream > SAL_CALL
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getBinaryStream() override;
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virtual sal_Int64 SAL_CALL
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position(const css::uno::Sequence< sal_Int8 >& rPattern,
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sal_Int64 aStart) override;
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virtual sal_Int64 SAL_CALL
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positionOfBlob(const css::uno::Reference< css::sdbc::XBlob >& rPattern,
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sal_Int64 aStart) override;
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// ---- XInputStream ----------------------------------------------
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virtual sal_Int32 SAL_CALL
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readBytes(css::uno::Sequence< sal_Int8 >& rDataOut,
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sal_Int32 nBytes) override;
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virtual sal_Int32 SAL_CALL
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readSomeBytes(css::uno::Sequence< sal_Int8 >& rDataOut,
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sal_Int32 nMaximumBytes) override;
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virtual void SAL_CALL
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skipBytes(sal_Int32 nBytes) override;
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virtual sal_Int32 SAL_CALL
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available() override;
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virtual void SAL_CALL
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closeInput() override;
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// ---- OComponentHelper ------------------------------------------
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virtual void SAL_CALL disposing() override;
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};
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}
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}
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#endif // INCLUDED_CONNECTIVITY_SOURCE_DRIVERS_FIREBIRD_BLOB_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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