C++使用Sqlite3，使用CppSQLite3的封装

使用CppSQLite3后操作Sqlite3更加方便
CppSQLite3.h

////////////////////////////////////////////////////////////////////////////////
// CppSQLite3 - A C++ wrapper around the SQLite3 embedded database library.
//
// Copyright (c) 2004..2007 Rob Groves. All Rights Reserved. [email protected]
// 
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement, is hereby granted, provided that the above copyright notice, 
// this paragraph and the following two paragraphs appear in all copies, 
// modifications, and distributions.
//
// IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
// INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST
// PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION,
// EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF
// ANY, PROVIDED HEREUNDER IS PROVIDED "AS IS". THE AUTHOR HAS NO OBLIGATION
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
//
// V3.0 03/08/2004 -Initial Version for sqlite3
//
// V3.1 16/09/2004 -Implemented getXXXXField using sqlite3 functions
// -Added CppSQLiteDB3::tableExists()
//
// V3.2 01/07/2005 -Fixed execScalar to handle a NULL result
// 12/07/2007 -Added CppSQLiteDB::IsAutoCommitOn()
// -Added int64 functions to CppSQLite3Query
// -Added Name based parameter binding to CppSQLite3Statement.
////////////////////////////////////////////////////////////////////////////////
#ifndef _CppSQLite3_H_
#define _CppSQLite3_H_

#include "sqlite3.h"
#include <cstdio>
#include <cstring>

#define CPPSQLITE_ERROR 1000

class CppSQLite3Exception
{
public:

    CppSQLite3Exception(const int nErrCode,
                    char* szErrMess,
                    bool bDeleteMsg=true);

    CppSQLite3Exception(const CppSQLite3Exception&  e);

    virtual ~CppSQLite3Exception();

    const int errorCode() { return mnErrCode; }

    const char* errorMessage() { return mpszErrMess; }

    static const char* errorCodeAsString(int nErrCode);

private:

    int mnErrCode;
    char* mpszErrMess;
};


class CppSQLite3Buffer
{
public:

    CppSQLite3Buffer();

    ~CppSQLite3Buffer();

    const char* format(const char* szFormat, ...);

    operator const char*() { return mpBuf; }

    void clear();

private:

    char* mpBuf;
};


class CppSQLite3Binary
{
public:

    CppSQLite3Binary();

    ~CppSQLite3Binary();

    void setBinary(const unsigned char* pBuf, int nLen);
    void setEncoded(const unsigned char* pBuf);

    const unsigned char* getEncoded();
    const unsigned char* getBinary();

    int getBinaryLength();

    unsigned char* allocBuffer(int nLen);

    void clear();

private:

    unsigned char* mpBuf;
    int mnBinaryLen;
    int mnBufferLen;
    int mnEncodedLen;
    bool mbEncoded;
};


class CppSQLite3Query
{
public:

    CppSQLite3Query();

    CppSQLite3Query(const CppSQLite3Query& rQuery);

    CppSQLite3Query(sqlite3* pDB,
                sqlite3_stmt* pVM,
                bool bEof,
                bool bOwnVM=true);

    CppSQLite3Query& operator=(const CppSQLite3Query& rQuery);

    virtual ~CppSQLite3Query();

    int numFields();

    int fieldIndex(const char* szField);
    const char* fieldName(int nCol);

    const char* fieldDeclType(int nCol);
    int fieldDataType(int nCol);

    const char* fieldValue(int nField);
    const char* fieldValue(const char* szField);

    int getIntField(int nField, int nNullValue=0);
    int getIntField(const char* szField, int nNullValue=0);

    sqlite_int64 getInt64Field(int nField, sqlite_int64 nNullValue=0);
    sqlite_int64 getInt64Field(const char* szField, sqlite_int64 nNullValue=0);

    double getFloatField(int nField, double fNullValue=0.0);
    double getFloatField(const char* szField, double fNullValue=0.0);

    const char* getStringField(int nField, const char* szNullValue="");
    const char* getStringField(const char* szField, const char* szNullValue="");

    const unsigned char* getBlobField(int nField, int& nLen);
    const unsigned char* getBlobField(const char* szField, int& nLen);

    bool fieldIsNull(int nField);
    bool fieldIsNull(const char* szField);

    bool eof();

    void nextRow();

    void finalize();

private:

    void checkVM();

    sqlite3* mpDB;
    sqlite3_stmt* mpVM;
    bool mbEof;
    int mnCols;
    bool mbOwnVM;
};


class CppSQLite3Table
{
public:

    CppSQLite3Table();

    CppSQLite3Table(const CppSQLite3Table& rTable);

    CppSQLite3Table(char** paszResults, int nRows, int nCols);

    virtual ~CppSQLite3Table();

    CppSQLite3Table& operator=(const CppSQLite3Table& rTable);

    int numFields();

    int numRows();

    const char* fieldName(int nCol);

    const char* fieldValue(int nField);
    const char* fieldValue(const char* szField);

    int getIntField(int nField, int nNullValue=0);
    int getIntField(const char* szField, int nNullValue=0);

    double getFloatField(int nField, double fNullValue=0.0);
    double getFloatField(const char* szField, double fNullValue=0.0);

    const char* getStringField(int nField, const char* szNullValue="");
    const char* getStringField(const char* szField, const char* szNullValue="");

    bool fieldIsNull(int nField);
    bool fieldIsNull(const char* szField);

    void setRow(int nRow);

    void finalize();

private:

    void checkResults();

    int mnCols;
    int mnRows;
    int mnCurrentRow;
    char** mpaszResults;
};


class CppSQLite3Statement
{
public:

    CppSQLite3Statement();

    CppSQLite3Statement(const CppSQLite3Statement& rStatement);

    CppSQLite3Statement(sqlite3* pDB, sqlite3_stmt* pVM);

    virtual ~CppSQLite3Statement();

    CppSQLite3Statement& operator=(const CppSQLite3Statement& rStatement);

    int execDML();

    CppSQLite3Query execQuery();

    void bind(int nParam, const char* szValue);
    void bind(int nParam, const int nValue);
    void bind(int nParam, const double dwValue);
    void bind(int nParam, const unsigned char* blobValue, int nLen);
    void bindNull(int nParam);

    int bindParameterIndex(const char* szParam);
    void bind(const char* szParam, const char* szValue);
    void bind(const char* szParam, const int nValue);
    void bind(const char* szParam, const double dwValue);
    void bind(const char* szParam, const unsigned char* blobValue, int nLen);
    void bindNull(const char* szParam);

    void reset();

    void finalize();

private:

    void checkDB();
    void checkVM();

    sqlite3* mpDB;
    sqlite3_stmt* mpVM;
};


class CppSQLite3DB
{
public:

    CppSQLite3DB();

    virtual ~CppSQLite3DB();

    void open(const char* szFile);

    void close();

    bool tableExists(const char* szTable);

    int execDML(const char* szSQL);

    CppSQLite3Query execQuery(const char* szSQL);

    int execScalar(const char* szSQL, int nNullValue=0);

    CppSQLite3Table getTable(const char* szSQL);

    CppSQLite3Statement compileStatement(const char* szSQL);

    sqlite_int64 lastRowId();

    void interrupt() { sqlite3_interrupt(mpDB); }

    void setBusyTimeout(int nMillisecs);

    static const char* SQLiteVersion() { return SQLITE_VERSION; }
    static const char* SQLiteHeaderVersion() { return SQLITE_VERSION; }
    static const char* SQLiteLibraryVersion() { return sqlite3_libversion(); }
    static int SQLiteLibraryVersionNumber() { return sqlite3_libversion_number(); }

    bool IsAutoCommitOn();

private:

    CppSQLite3DB(const CppSQLite3DB& db);
    CppSQLite3DB& operator=(const CppSQLite3DB& db);

    sqlite3_stmt* compile(const char* szSQL);

    void checkDB();

    sqlite3* mpDB;
    int mnBusyTimeoutMs;
};

#endif

CppSQLite3.cpp

////////////////////////////////////////////////////////////////////////////////
// CppSQLite3 - A C++ wrapper around the SQLite3 embedded database library.
//
// Copyright (c) 2004..2007 Rob Groves. All Rights Reserved. [email protected]
// 
// Permission to use, copy, modify, and distribute this software and its
// documentation for any purpose, without fee, and without a written
// agreement, is hereby granted, provided that the above copyright notice, 
// this paragraph and the following two paragraphs appear in all copies, 
// modifications, and distributions.
//
// IN NO EVENT SHALL THE AUTHOR BE LIABLE TO ANY PARTY FOR DIRECT,
// INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST
// PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION,
// EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// THE AUTHOR SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE. THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF
// ANY, PROVIDED HEREUNDER IS PROVIDED "AS IS". THE AUTHOR HAS NO OBLIGATION
// TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
//
// V3.0 03/08/2004 -Initial Version for sqlite3
//
// V3.1 16/09/2004 -Implemented getXXXXField using sqlite3 functions
// -Added CppSQLiteDB3::tableExists()
//
// V3.2 01/07/2005 -Fixed execScalar to handle a NULL result
// 12/07/2007 -Added int64 functions to CppSQLite3Query
// -Throw exception from CppSQLite3DB::close() if error
// -Trap above exception in CppSQLite3DB::~CppSQLite3DB()
// -Fix to CppSQLite3DB::compile() as provided by Dave Rollins.
// -sqlite3_prepare replaced with sqlite3_prepare_v2
// -Added Name based parameter binding to CppSQLite3Statement.
////////////////////////////////////////////////////////////////////////////////
#include "CppSQLite3.h"
#include <cstdlib>


// Named constant for passing to CppSQLite3Exception when passing it a string
// that cannot be deleted.
static const bool DONT_DELETE_MSG=false;

////////////////////////////////////////////////////////////////////////////////
// Prototypes for SQLite functions not included in SQLite DLL, but copied below
// from SQLite encode.c
////////////////////////////////////////////////////////////////////////////////
int sqlite3_encode_binary(const unsigned char *in, int n, unsigned char *out);
int sqlite3_decode_binary(const unsigned char *in, unsigned char *out);

////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////

CppSQLite3Exception::CppSQLite3Exception(const int nErrCode,
                                    char* szErrMess,
                                    bool bDeleteMsg/*=true*/) :
                                    mnErrCode(nErrCode)
{
    mpszErrMess = sqlite3_mprintf("%s[%d]: %s",
                                errorCodeAsString(nErrCode),
                                nErrCode,
                                szErrMess ? szErrMess : "");

    if (bDeleteMsg && szErrMess)
    {
        sqlite3_free(szErrMess);
    }
}


CppSQLite3Exception::CppSQLite3Exception(const CppSQLite3Exception&  e) :
                                    mnErrCode(e.mnErrCode)
{
    mpszErrMess = 0;
    if (e.mpszErrMess)
    {
        mpszErrMess = sqlite3_mprintf("%s", e.mpszErrMess);
    }
}


const char* CppSQLite3Exception::errorCodeAsString(int nErrCode)
{
    switch (nErrCode)
    {
        case SQLITE_OK          : return "SQLITE_OK";
        case SQLITE_ERROR       : return "SQLITE_ERROR";
        case SQLITE_INTERNAL    : return "SQLITE_INTERNAL";
        case SQLITE_PERM        : return "SQLITE_PERM";
        case SQLITE_ABORT       : return "SQLITE_ABORT";
        case SQLITE_BUSY        : return "SQLITE_BUSY";
        case SQLITE_LOCKED      : return "SQLITE_LOCKED";
        case SQLITE_NOMEM       : return "SQLITE_NOMEM";
        case SQLITE_READONLY    : return "SQLITE_READONLY";
        case SQLITE_INTERRUPT   : return "SQLITE_INTERRUPT";
        case SQLITE_IOERR       : return "SQLITE_IOERR";
        case SQLITE_CORRUPT     : return "SQLITE_CORRUPT";
        case SQLITE_NOTFOUND    : return "SQLITE_NOTFOUND";
        case SQLITE_FULL        : return "SQLITE_FULL";
        case SQLITE_CANTOPEN    : return "SQLITE_CANTOPEN";
        case SQLITE_PROTOCOL    : return "SQLITE_PROTOCOL";
        case SQLITE_EMPTY       : return "SQLITE_EMPTY";
        case SQLITE_SCHEMA      : return "SQLITE_SCHEMA";
        case SQLITE_TOOBIG      : return "SQLITE_TOOBIG";
        case SQLITE_CONSTRAINT  : return "SQLITE_CONSTRAINT";
        case SQLITE_MISMATCH    : return "SQLITE_MISMATCH";
        case SQLITE_MISUSE      : return "SQLITE_MISUSE";
        case SQLITE_NOLFS       : return "SQLITE_NOLFS";
        case SQLITE_AUTH        : return "SQLITE_AUTH";
        case SQLITE_FORMAT      : return "SQLITE_FORMAT";
        case SQLITE_RANGE       : return "SQLITE_RANGE";
        case SQLITE_ROW         : return "SQLITE_ROW";
        case SQLITE_DONE        : return "SQLITE_DONE";
        case CPPSQLITE_ERROR    : return "CPPSQLITE_ERROR";
        default: return "UNKNOWN_ERROR";
    }
}


CppSQLite3Exception::~CppSQLite3Exception()
{
    if (mpszErrMess)
    {
        sqlite3_free(mpszErrMess);
        mpszErrMess = 0;
    }
}


////////////////////////////////////////////////////////////////////////////////

CppSQLite3Buffer::CppSQLite3Buffer()
{
    mpBuf = 0;
}


CppSQLite3Buffer::~CppSQLite3Buffer()
{
    clear();
}


void CppSQLite3Buffer::clear()
{
    if (mpBuf)
    {
        sqlite3_free(mpBuf);
        mpBuf = 0;
    }

}


const char* CppSQLite3Buffer::format(const char* szFormat, ...)
{
    clear();
    va_list va;
    va_start(va, szFormat);
    mpBuf = sqlite3_vmprintf(szFormat, va);
    va_end(va);
    return mpBuf;
}


////////////////////////////////////////////////////////////////////////////////

CppSQLite3Binary::CppSQLite3Binary() :
                        mpBuf(0),
                        mnBinaryLen(0),
                        mnBufferLen(0),
                        mnEncodedLen(0),
                        mbEncoded(false)
{
}


CppSQLite3Binary::~CppSQLite3Binary()
{
    clear();
}


void CppSQLite3Binary::setBinary(const unsigned char* pBuf, int nLen)
{
    mpBuf = allocBuffer(nLen);
    memcpy(mpBuf, pBuf, nLen);
}


void CppSQLite3Binary::setEncoded(const unsigned char* pBuf)
{
    clear();

    mnEncodedLen = strlen((const char*)pBuf);
    mnBufferLen = mnEncodedLen + 1; // Allow for NULL terminator

    mpBuf = (unsigned char*)malloc(mnBufferLen);

    if (!mpBuf)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Cannot allocate memory",
                                DONT_DELETE_MSG);
    }

    memcpy(mpBuf, pBuf, mnBufferLen);
    mbEncoded = true;
}


const unsigned char* CppSQLite3Binary::getEncoded()
{
    if (!mbEncoded)
    {
        unsigned char* ptmp = (unsigned char*)malloc(mnBinaryLen);
        memcpy(ptmp, mpBuf, mnBinaryLen);
        mnEncodedLen = sqlite3_encode_binary(ptmp, mnBinaryLen, mpBuf);
        free(ptmp);
        mbEncoded = true;
    }

    return mpBuf;
}


const unsigned char* CppSQLite3Binary::getBinary()
{
    if (mbEncoded)
    {
        // in/out buffers can be the same
        mnBinaryLen = sqlite3_decode_binary(mpBuf, mpBuf);

        if (mnBinaryLen == -1)
        {
            throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                    "Cannot decode binary",
                                    DONT_DELETE_MSG);
        }

        mbEncoded = false;
    }

    return mpBuf;
}


int CppSQLite3Binary::getBinaryLength()
{
    getBinary();
    return mnBinaryLen;
}


unsigned char* CppSQLite3Binary::allocBuffer(int nLen)
{
    clear();

    // Allow extra space for encoded binary as per comments in
    // SQLite encode.c See bottom of this file for implementation
    // of SQLite functions use 3 instead of 2 just to be sure ;-)
    mnBinaryLen = nLen;
    mnBufferLen = 3 + (257*nLen)/254;

    mpBuf = (unsigned char*)malloc(mnBufferLen);

    if (!mpBuf)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Cannot allocate memory",
                                DONT_DELETE_MSG);
    }

    mbEncoded = false;

    return mpBuf;
}


void CppSQLite3Binary::clear()
{
    if (mpBuf)
    {
        mnBinaryLen = 0;
        mnBufferLen = 0;
        free(mpBuf);
        mpBuf = 0;
    }
}


////////////////////////////////////////////////////////////////////////////////

CppSQLite3Query::CppSQLite3Query()
{
    mpVM = 0;
    mbEof = true;
    mnCols = 0;
    mbOwnVM = false;
}


CppSQLite3Query::CppSQLite3Query(const CppSQLite3Query& rQuery)
{
    mpVM = rQuery.mpVM;
    // Only one object can own the VM
    const_cast<CppSQLite3Query&>(rQuery).mpVM = 0;
    mbEof = rQuery.mbEof;
    mnCols = rQuery.mnCols;
    mbOwnVM = rQuery.mbOwnVM;
}


CppSQLite3Query::CppSQLite3Query(sqlite3* pDB,
                            sqlite3_stmt* pVM,
                            bool bEof,
                            bool bOwnVM/*=true*/)
{
    mpDB = pDB;
    mpVM = pVM;
    mbEof = bEof;
    mnCols = sqlite3_column_count(mpVM);
    mbOwnVM = bOwnVM;
}


CppSQLite3Query::~CppSQLite3Query()
{
    try
    {
        finalize();
    }
    catch (...)
    {
    }
}


CppSQLite3Query& CppSQLite3Query::operator=(const CppSQLite3Query& rQuery)
{
    try
    {
        finalize();
    }
    catch (...)
    {
    }
    mpVM = rQuery.mpVM;
    // Only one object can own the VM
    const_cast<CppSQLite3Query&>(rQuery).mpVM = 0;
    mbEof = rQuery.mbEof;
    mnCols = rQuery.mnCols;
    mbOwnVM = rQuery.mbOwnVM;
    return *this;
}


int CppSQLite3Query::numFields()
{
    checkVM();
    return mnCols;
}


const char* CppSQLite3Query::fieldValue(int nField)
{
    checkVM();

    if (nField < 0 || nField > mnCols-1)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Invalid field index requested",
                                DONT_DELETE_MSG);
    }

    return (const char*)sqlite3_column_text(mpVM, nField);
}


const char* CppSQLite3Query::fieldValue(const char* szField)
{
    int nField = fieldIndex(szField);
    return (const char*)sqlite3_column_text(mpVM, nField);
}


int CppSQLite3Query::getIntField(int nField, int nNullValue/*=0*/)
{
    if (fieldDataType(nField) == SQLITE_NULL)
    {
        return nNullValue;
    }
    else
    {
        return sqlite3_column_int(mpVM, nField);
    }
}


int CppSQLite3Query::getIntField(const char* szField, int nNullValue/*=0*/)
{
    int nField = fieldIndex(szField);
    return getIntField(nField, nNullValue);
}


sqlite_int64 CppSQLite3Query::getInt64Field(int nField, sqlite_int64 nNullValue/*=0*/)
{
    if (fieldDataType(nField) == SQLITE_NULL)
    {
        return nNullValue;
    }
    else
    {
        return sqlite3_column_int64(mpVM, nField);
    }
}


sqlite_int64 CppSQLite3Query::getInt64Field(const char* szField, sqlite_int64 nNullValue/*=0*/)
{
    int nField = fieldIndex(szField);
    return getInt64Field(nField, nNullValue);
}


double CppSQLite3Query::getFloatField(int nField, double fNullValue/*=0.0*/)
{
    if (fieldDataType(nField) == SQLITE_NULL)
    {
        return fNullValue;
    }
    else
    {
        return sqlite3_column_double(mpVM, nField);
    }
}


double CppSQLite3Query::getFloatField(const char* szField, double fNullValue/*=0.0*/)
{
    int nField = fieldIndex(szField);
    return getFloatField(nField, fNullValue);
}


const char* CppSQLite3Query::getStringField(int nField, const char* szNullValue/*=""*/)
{
    if (fieldDataType(nField) == SQLITE_NULL)
    {
        return szNullValue;
    }
    else
    {
        return (const char*)sqlite3_column_text(mpVM, nField);
    }
}


const char* CppSQLite3Query::getStringField(const char* szField, const char* szNullValue/*=""*/)
{
    int nField = fieldIndex(szField);
    return getStringField(nField, szNullValue);
}


const unsigned char* CppSQLite3Query::getBlobField(int nField, int& nLen)
{
    checkVM();

    if (nField < 0 || nField > mnCols-1)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Invalid field index requested",
                                DONT_DELETE_MSG);
    }

    nLen = sqlite3_column_bytes(mpVM, nField);
    return (const unsigned char*)sqlite3_column_blob(mpVM, nField);
}


const unsigned char* CppSQLite3Query::getBlobField(const char* szField, int& nLen)
{
    int nField = fieldIndex(szField);
    return getBlobField(nField, nLen);
}


bool CppSQLite3Query::fieldIsNull(int nField)
{
    return (fieldDataType(nField) == SQLITE_NULL);
}


bool CppSQLite3Query::fieldIsNull(const char* szField)
{
    int nField = fieldIndex(szField);
    return (fieldDataType(nField) == SQLITE_NULL);
}


int CppSQLite3Query::fieldIndex(const char* szField)
{
    checkVM();

    if (szField)
    {
        for (int nField = 0; nField < mnCols; nField++)
        {
            const char* szTemp = sqlite3_column_name(mpVM, nField);

            if (strcmp(szField, szTemp) == 0)
            {
                return nField;
            }
        }
    }

    throw CppSQLite3Exception(CPPSQLITE_ERROR,
                            "Invalid field name requested",
                            DONT_DELETE_MSG);
}


const char* CppSQLite3Query::fieldName(int nCol)
{
    checkVM();

    if (nCol < 0 || nCol > mnCols-1)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Invalid field index requested",
                                DONT_DELETE_MSG);
    }

    return sqlite3_column_name(mpVM, nCol);
}


const char* CppSQLite3Query::fieldDeclType(int nCol)
{
    checkVM();

    if (nCol < 0 || nCol > mnCols-1)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Invalid field index requested",
                                DONT_DELETE_MSG);
    }

    return sqlite3_column_decltype(mpVM, nCol);
}


int CppSQLite3Query::fieldDataType(int nCol)
{
    checkVM();

    if (nCol < 0 || nCol > mnCols-1)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Invalid field index requested",
                                DONT_DELETE_MSG);
    }

    return sqlite3_column_type(mpVM, nCol);
}


bool CppSQLite3Query::eof()
{
    checkVM();
    return mbEof;
}


void CppSQLite3Query::nextRow()
{
    checkVM();

    int nRet = sqlite3_step(mpVM);

    if (nRet == SQLITE_DONE)
    {
        // no rows
        mbEof = true;
    }
    else if (nRet == SQLITE_ROW)
    {
        // more rows, nothing to do
    }
    else
    {
        nRet = sqlite3_finalize(mpVM);
        mpVM = 0;
        const char* szError = sqlite3_errmsg(mpDB);
        throw CppSQLite3Exception(nRet,
                                (char*)szError,
                                DONT_DELETE_MSG);
    }
}


void CppSQLite3Query::finalize()
{
    if (mpVM && mbOwnVM)
    {
        int nRet = sqlite3_finalize(mpVM);
        mpVM = 0;
        if (nRet != SQLITE_OK)
        {
            const char* szError = sqlite3_errmsg(mpDB);
            throw CppSQLite3Exception(nRet, (char*)szError, DONT_DELETE_MSG);
        }
    }
}


void CppSQLite3Query::checkVM()
{
    if (mpVM == 0)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Null Virtual Machine pointer",
                                DONT_DELETE_MSG);
    }
}


////////////////////////////////////////////////////////////////////////////////

CppSQLite3Table::CppSQLite3Table()
{
    mpaszResults = 0;
    mnRows = 0;
    mnCols = 0;
    mnCurrentRow = 0;
}


CppSQLite3Table::CppSQLite3Table(const CppSQLite3Table& rTable)
{
    mpaszResults = rTable.mpaszResults;
    // Only one object can own the results
    const_cast<CppSQLite3Table&>(rTable).mpaszResults = 0;
    mnRows = rTable.mnRows;
    mnCols = rTable.mnCols;
    mnCurrentRow = rTable.mnCurrentRow;
}


CppSQLite3Table::CppSQLite3Table(char** paszResults, int nRows, int nCols)
{
    mpaszResults = paszResults;
    mnRows = nRows;
    mnCols = nCols;
    mnCurrentRow = 0;
}


CppSQLite3Table::~CppSQLite3Table()
{
    try
    {
        finalize();
    }
    catch (...)
    {
    }
}


CppSQLite3Table& CppSQLite3Table::operator=(const CppSQLite3Table& rTable)
{
    try
    {
        finalize();
    }
    catch (...)
    {
    }
    mpaszResults = rTable.mpaszResults;
    // Only one object can own the results
    const_cast<CppSQLite3Table&>(rTable).mpaszResults = 0;
    mnRows = rTable.mnRows;
    mnCols = rTable.mnCols;
    mnCurrentRow = rTable.mnCurrentRow;
    return *this;
}


void CppSQLite3Table::finalize()
{
    if (mpaszResults)
    {
        sqlite3_free_table(mpaszResults);
        mpaszResults = 0;
    }
}


int CppSQLite3Table::numFields()
{
    checkResults();
    return mnCols;
}


int CppSQLite3Table::numRows()
{
    checkResults();
    return mnRows;
}


const char* CppSQLite3Table::fieldValue(int nField)
{
    checkResults();

    if (nField < 0 || nField > mnCols-1)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Invalid field index requested",
                                DONT_DELETE_MSG);
    }

    int nIndex = (mnCurrentRow*mnCols) + mnCols + nField;
    return mpaszResults[nIndex];
}


const char* CppSQLite3Table::fieldValue(const char* szField)
{
    checkResults();

    if (szField)
    {
        for (int nField = 0; nField < mnCols; nField++)
        {
            if (strcmp(szField, mpaszResults[nField]) == 0)
            {
                int nIndex = (mnCurrentRow*mnCols) + mnCols + nField;
                return mpaszResults[nIndex];
            }
        }
    }

    throw CppSQLite3Exception(CPPSQLITE_ERROR,
                            "Invalid field name requested",
                            DONT_DELETE_MSG);
}


int CppSQLite3Table::getIntField(int nField, int nNullValue/*=0*/)
{
    if (fieldIsNull(nField))
    {
        return nNullValue;
    }
    else
    {
        return atoi(fieldValue(nField));
    }
}


int CppSQLite3Table::getIntField(const char* szField, int nNullValue/*=0*/)
{
    if (fieldIsNull(szField))
    {
        return nNullValue;
    }
    else
    {
        return atoi(fieldValue(szField));
    }
}


double CppSQLite3Table::getFloatField(int nField, double fNullValue/*=0.0*/)
{
    if (fieldIsNull(nField))
    {
        return fNullValue;
    }
    else
    {
        return atof(fieldValue(nField));
    }
}


double CppSQLite3Table::getFloatField(const char* szField, double fNullValue/*=0.0*/)
{
    if (fieldIsNull(szField))
    {
        return fNullValue;
    }
    else
    {
        return atof(fieldValue(szField));
    }
}


const char* CppSQLite3Table::getStringField(int nField, const char* szNullValue/*=""*/)
{
    if (fieldIsNull(nField))
    {
        return szNullValue;
    }
    else
    {
        return fieldValue(nField);
    }
}


const char* CppSQLite3Table::getStringField(const char* szField, const char* szNullValue/*=""*/)
{
    if (fieldIsNull(szField))
    {
        return szNullValue;
    }
    else
    {
        return fieldValue(szField);
    }
}


bool CppSQLite3Table::fieldIsNull(int nField)
{
    checkResults();
    return (fieldValue(nField) == 0);
}


bool CppSQLite3Table::fieldIsNull(const char* szField)
{
    checkResults();
    return (fieldValue(szField) == 0);
}


const char* CppSQLite3Table::fieldName(int nCol)
{
    checkResults();

    if (nCol < 0 || nCol > mnCols-1)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Invalid field index requested",
                                DONT_DELETE_MSG);
    }

    return mpaszResults[nCol];
}


void CppSQLite3Table::setRow(int nRow)
{
    checkResults();

    if (nRow < 0 || nRow > mnRows-1)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Invalid row index requested",
                                DONT_DELETE_MSG);
    }

    mnCurrentRow = nRow;
}


void CppSQLite3Table::checkResults()
{
    if (mpaszResults == 0)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Null Results pointer",
                                DONT_DELETE_MSG);
    }
}


////////////////////////////////////////////////////////////////////////////////

CppSQLite3Statement::CppSQLite3Statement()
{
    mpDB = 0;
    mpVM = 0;
}


CppSQLite3Statement::CppSQLite3Statement(const CppSQLite3Statement& rStatement)
{
    mpDB = rStatement.mpDB;
    mpVM = rStatement.mpVM;
    // Only one object can own VM
    const_cast<CppSQLite3Statement&>(rStatement).mpVM = 0;
}


CppSQLite3Statement::CppSQLite3Statement(sqlite3* pDB, sqlite3_stmt* pVM)
{
    mpDB = pDB;
    mpVM = pVM;
}


CppSQLite3Statement::~CppSQLite3Statement()
{
    try
    {
        finalize();
    }
    catch (...)
    {
    }
}


CppSQLite3Statement& CppSQLite3Statement::operator=(const CppSQLite3Statement& rStatement)
{
    mpDB = rStatement.mpDB;
    mpVM = rStatement.mpVM;
    // Only one object can own VM
    const_cast<CppSQLite3Statement&>(rStatement).mpVM = 0;
    return *this;
}


int CppSQLite3Statement::execDML()
{
    checkDB();
    checkVM();

    const char* szError=0;

    int nRet = sqlite3_step(mpVM);

    if (nRet == SQLITE_DONE)
    {
        int nRowsChanged = sqlite3_changes(mpDB);

        nRet = sqlite3_reset(mpVM);

        if (nRet != SQLITE_OK)
        {
            szError = sqlite3_errmsg(mpDB);
            throw CppSQLite3Exception(nRet, (char*)szError, DONT_DELETE_MSG);
        }

        return nRowsChanged;
    }
    else
    {
        nRet = sqlite3_reset(mpVM);
        szError = sqlite3_errmsg(mpDB);
        throw CppSQLite3Exception(nRet, (char*)szError, DONT_DELETE_MSG);
    }
}


CppSQLite3Query CppSQLite3Statement::execQuery()
{
    checkDB();
    checkVM();

    int nRet = sqlite3_step(mpVM);

    if (nRet == SQLITE_DONE)
    {
        // no rows
        return CppSQLite3Query(mpDB, mpVM, true/*eof*/, false);
    }
    else if (nRet == SQLITE_ROW)
    {
        // at least 1 row
        return CppSQLite3Query(mpDB, mpVM, false/*eof*/, false);
    }
    else
    {
        nRet = sqlite3_reset(mpVM);
        const char* szError = sqlite3_errmsg(mpDB);
        throw CppSQLite3Exception(nRet, (char*)szError, DONT_DELETE_MSG);
    }
}


void CppSQLite3Statement::bind(int nParam, const char* szValue)
{
    checkVM();
    int nRes = sqlite3_bind_text(mpVM, nParam, szValue, -1, SQLITE_TRANSIENT);

    if (nRes != SQLITE_OK)
    {
        throw CppSQLite3Exception(nRes,
                                "Error binding string param",
                                DONT_DELETE_MSG);
    }
}


void CppSQLite3Statement::bind(int nParam, const int nValue)
{
    checkVM();
    int nRes = sqlite3_bind_int(mpVM, nParam, nValue);

    if (nRes != SQLITE_OK)
    {
        throw CppSQLite3Exception(nRes,
                                "Error binding int param",
                                DONT_DELETE_MSG);
    }
}


void CppSQLite3Statement::bind(int nParam, const double dValue)
{
    checkVM();
    int nRes = sqlite3_bind_double(mpVM, nParam, dValue);

    if (nRes != SQLITE_OK)
    {
        throw CppSQLite3Exception(nRes,
                                "Error binding double param",
                                DONT_DELETE_MSG);
    }
}


void CppSQLite3Statement::bind(int nParam, const unsigned char* blobValue, int nLen)
{
    checkVM();
    int nRes = sqlite3_bind_blob(mpVM, nParam,
                                (const void*)blobValue, nLen, SQLITE_TRANSIENT);

    if (nRes != SQLITE_OK)
    {
        throw CppSQLite3Exception(nRes,
                                "Error binding blob param",
                                DONT_DELETE_MSG);
    }
}


void CppSQLite3Statement::bindNull(int nParam)
{
    checkVM();
    int nRes = sqlite3_bind_null(mpVM, nParam);

    if (nRes != SQLITE_OK)
    {
        throw CppSQLite3Exception(nRes,
                                "Error binding NULL param",
                                DONT_DELETE_MSG);
    }
}


int CppSQLite3Statement::bindParameterIndex(const char* szParam)
{
    checkVM();

    int nParam = sqlite3_bind_parameter_index(mpVM, szParam);

int nn = sqlite3_bind_parameter_count(mpVM);
const char* sz1 = sqlite3_bind_parameter_name(mpVM, 1);
const char* sz2 = sqlite3_bind_parameter_name(mpVM, 2);

    if (!nParam)
    {
        char buf[128];
        sprintf(buf, "Parameter '%s' is not valid for this statement", szParam);
        throw CppSQLite3Exception(CPPSQLITE_ERROR, buf, DONT_DELETE_MSG);
    }

    return nParam;
}


void CppSQLite3Statement::bind(const char* szParam, const char* szValue)
{
    int nParam = bindParameterIndex(szParam);
    bind(nParam, szValue);
}


void CppSQLite3Statement::bind(const char* szParam, const int nValue)
{
    int nParam = bindParameterIndex(szParam);
    bind(nParam, nValue);
}

void CppSQLite3Statement::bind(const char* szParam, const double dwValue)
{
    int nParam = bindParameterIndex(szParam);
    bind(nParam, dwValue);
}

void CppSQLite3Statement::bind(const char* szParam, const unsigned char* blobValue, int nLen)
{
    int nParam = bindParameterIndex(szParam);
    bind(nParam, blobValue, nLen);
}


void CppSQLite3Statement::bindNull(const char* szParam)
{
    int nParam = bindParameterIndex(szParam);
    bindNull(nParam);
}


void CppSQLite3Statement::reset()
{
    if (mpVM)
    {
        int nRet = sqlite3_reset(mpVM);

        if (nRet != SQLITE_OK)
        {
            const char* szError = sqlite3_errmsg(mpDB);
            throw CppSQLite3Exception(nRet, (char*)szError, DONT_DELETE_MSG);
        }
    }
}


void CppSQLite3Statement::finalize()
{
    if (mpVM)
    {
        int nRet = sqlite3_finalize(mpVM);
        mpVM = 0;

        if (nRet != SQLITE_OK)
        {
            const char* szError = sqlite3_errmsg(mpDB);
            throw CppSQLite3Exception(nRet, (char*)szError, DONT_DELETE_MSG);
        }
    }
}


void CppSQLite3Statement::checkDB()
{
    if (mpDB == 0)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Database not open",
                                DONT_DELETE_MSG);
    }
}


void CppSQLite3Statement::checkVM()
{
    if (mpVM == 0)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Null Virtual Machine pointer",
                                DONT_DELETE_MSG);
    }
}


////////////////////////////////////////////////////////////////////////////////

CppSQLite3DB::CppSQLite3DB()
{
    mpDB = 0;
    mnBusyTimeoutMs = 60000; // 60 seconds
}


CppSQLite3DB::CppSQLite3DB(const CppSQLite3DB& db)
{
    mpDB = db.mpDB;
    mnBusyTimeoutMs = 60000; // 60 seconds
}


CppSQLite3DB::~CppSQLite3DB()
{
    try
    {
        close();
    }
    catch (...)
    {
    }
}


CppSQLite3DB& CppSQLite3DB::operator=(const CppSQLite3DB& db)
{
    mpDB = db.mpDB;
    mnBusyTimeoutMs = 60000; // 60 seconds
    return *this;
}


void CppSQLite3DB::open(const char* szFile)
{
    int nRet = sqlite3_open(szFile, &mpDB);

    if (nRet != SQLITE_OK)
    {
        const char* szError = sqlite3_errmsg(mpDB);
        throw CppSQLite3Exception(nRet, (char*)szError, DONT_DELETE_MSG);
    }

    setBusyTimeout(mnBusyTimeoutMs);
}


void CppSQLite3DB::close()
{
    if (mpDB)
    {
        if (sqlite3_close(mpDB) == SQLITE_OK)
        {
            mpDB = 0;
        }
        else
        {
            throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                    "Unable to close database",
                                    DONT_DELETE_MSG);
        }
    }
}


CppSQLite3Statement CppSQLite3DB::compileStatement(const char* szSQL)
{
    checkDB();

    sqlite3_stmt* pVM = compile(szSQL);
    return CppSQLite3Statement(mpDB, pVM);
}


bool CppSQLite3DB::tableExists(const char* szTable)
{
    char szSQL[256];
    sprintf(szSQL,
            "select count(*) from sqlite_master where type='table' and name='%s'",
            szTable);
    int nRet = execScalar(szSQL);
    return (nRet > 0);
}


int CppSQLite3DB::execDML(const char* szSQL)
{
    checkDB();

    char* szError=0;

    int nRet = sqlite3_exec(mpDB, szSQL, 0, 0, &szError);

    if (nRet == SQLITE_OK)
    {
        return sqlite3_changes(mpDB);
    }
    else
    {
        throw CppSQLite3Exception(nRet, szError);
    }
}


CppSQLite3Query CppSQLite3DB::execQuery(const char* szSQL)
{
    checkDB();

    sqlite3_stmt* pVM = compile(szSQL);

    int nRet = sqlite3_step(pVM);

    if (nRet == SQLITE_DONE)
    {
        // no rows
        return CppSQLite3Query(mpDB, pVM, true/*eof*/);
    }
    else if (nRet == SQLITE_ROW)
    {
        // at least 1 row
        return CppSQLite3Query(mpDB, pVM, false/*eof*/);
    }
    else
    {
        nRet = sqlite3_finalize(pVM);
        const char* szError= sqlite3_errmsg(mpDB);
        throw CppSQLite3Exception(nRet, (char*)szError, DONT_DELETE_MSG);
    }
}


int CppSQLite3DB::execScalar(const char* szSQL, int nNullValue/*=0*/)
{
    CppSQLite3Query q = execQuery(szSQL);

    if (q.eof() || q.numFields() < 1)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Invalid scalar query",
                                DONT_DELETE_MSG);
    }

    return q.getIntField(0, nNullValue);
}


CppSQLite3Table CppSQLite3DB::getTable(const char* szSQL)
{
    checkDB();

    char* szError=0;
    char** paszResults=0;
    int nRet;
    int nRows(0);
    int nCols(0);

    nRet = sqlite3_get_table(mpDB, szSQL, &paszResults, &nRows, &nCols, &szError);

    if (nRet == SQLITE_OK)
    {
        return CppSQLite3Table(paszResults, nRows, nCols);
    }
    else
    {
        throw CppSQLite3Exception(nRet, szError);
    }
}


sqlite_int64 CppSQLite3DB::lastRowId()
{
    return sqlite3_last_insert_rowid(mpDB);
}


void CppSQLite3DB::setBusyTimeout(int nMillisecs)
{
    mnBusyTimeoutMs = nMillisecs;
    sqlite3_busy_timeout(mpDB, mnBusyTimeoutMs);
}


void CppSQLite3DB::checkDB()
{
    if (!mpDB)
    {
        throw CppSQLite3Exception(CPPSQLITE_ERROR,
                                "Database not open",
                                DONT_DELETE_MSG);
    }
}


sqlite3_stmt* CppSQLite3DB::compile(const char* szSQL)
{
    checkDB();

    const char* szTail=0;
    sqlite3_stmt* pVM;

    int nRet = sqlite3_prepare_v2(mpDB, szSQL, -1, &pVM, &szTail);

    if (nRet != SQLITE_OK)
    {
        const char* szError = sqlite3_errmsg(mpDB);
        throw CppSQLite3Exception(nRet,
                                (char*)szError,
                                DONT_DELETE_MSG);
    }

    return pVM;
}

bool CppSQLite3DB::IsAutoCommitOn()
{
    checkDB();
    return sqlite3_get_autocommit(mpDB) ? true : false;
}

////////////////////////////////////////////////////////////////////////////////
// SQLite encode.c reproduced here, containing implementation notes and source
// for sqlite3_encode_binary() and sqlite3_decode_binary() 
////////////////////////////////////////////////////////////////////////////////

/* ** 2002 April 25 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** This file contains helper routines used to translate binary data into ** a null-terminated string (suitable for use in SQLite) and back again. ** These are convenience routines for use by people who want to store binary ** data in an SQLite database. The code in this file is not used by any other ** part of the SQLite library. ** ** $Id: encode.c,v 1.10 2004/01/14 21:59:23 drh Exp $ */

/* ** How This Encoder Works ** ** The output is allowed to contain any character except 0x27 (') and ** 0x00. This is accomplished by using an escape character to encode ** 0x27 and 0x00 as a two-byte sequence. The escape character is always ** 0x01. An 0x00 is encoded as the two byte sequence 0x01 0x01. The ** 0x27 character is encoded as the two byte sequence 0x01 0x03. Finally, ** the escape character itself is encoded as the two-character sequence ** 0x01 0x02. ** ** To summarize, the encoder works by using an escape sequences as follows: ** ** 0x00 -> 0x01 0x01 ** 0x01 -> 0x01 0x02 ** 0x27 -> 0x01 0x03 ** ** If that were all the encoder did, it would work, but in certain cases ** it could double the size of the encoded string. For example, to ** encode a string of 100 0x27 characters would require 100 instances of ** the 0x01 0x03 escape sequence resulting in a 200-character output. ** We would prefer to keep the size of the encoded string smaller than ** this. ** ** To minimize the encoding size, we first add a fixed offset value to each ** byte in the sequence. The addition is modulo 256. (That is to say, if ** the sum of the original character value and the offset exceeds 256, then ** the higher order bits are truncated.) The offset is chosen to minimize ** the number of characters in the string that need to be escaped. For ** example, in the case above where the string was composed of 100 0x27 ** characters, the offset might be 0x01. Each of the 0x27 characters would ** then be converted into an 0x28 character which would not need to be ** escaped at all and so the 100 character input string would be converted ** into just 100 characters of output. Actually 101 characters of output - ** we have to record the offset used as the first byte in the sequence so ** that the string can be decoded. Since the offset value is stored as ** part of the output string and the output string is not allowed to contain ** characters 0x00 or 0x27, the offset cannot be 0x00 or 0x27. ** ** Here, then, are the encoding steps: ** ** (1) Choose an offset value and make it the first character of ** output. ** ** (2) Copy each input character into the output buffer, one by ** one, adding the offset value as you copy. ** ** (3) If the value of an input character plus offset is 0x00, replace ** that one character by the two-character sequence 0x01 0x01. ** If the sum is 0x01, replace it with 0x01 0x02. If the sum ** is 0x27, replace it with 0x01 0x03. ** ** (4) Put a 0x00 terminator at the end of the output. ** ** Decoding is obvious: ** ** (5) Copy encoded characters except the first into the decode ** buffer. Set the first encoded character aside for use as ** the offset in step 7 below. ** ** (6) Convert each 0x01 0x01 sequence into a single character 0x00. ** Convert 0x01 0x02 into 0x01. Convert 0x01 0x03 into 0x27. ** ** (7) Subtract the offset value that was the first character of ** the encoded buffer from all characters in the output buffer. ** ** The only tricky part is step (1) - how to compute an offset value to ** minimize the size of the output buffer. This is accomplished by testing ** all offset values and picking the one that results in the fewest number ** of escapes. To do that, we first scan the entire input and count the ** number of occurances of each character value in the input. Suppose ** the number of 0x00 characters is N(0), the number of occurances of 0x01 ** is N(1), and so forth up to the number of occurances of 0xff is N(255). ** An offset of 0 is not allowed so we don't have to test it. The number ** of escapes required for an offset of 1 is N(1)+N(2)+N(40). The number ** of escapes required for an offset of 2 is N(2)+N(3)+N(41). And so forth. ** In this way we find the offset that gives the minimum number of escapes, ** and thus minimizes the length of the output string. */

/* ** Encode a binary buffer "in" of size n bytes so that it contains ** no instances of characters '\'' or '\000'. The output is ** null-terminated and can be used as a string value in an INSERT ** or UPDATE statement. Use sqlite3_decode_binary() to convert the ** string back into its original binary. ** ** The result is written into a preallocated output buffer "out". ** "out" must be able to hold at least 2 +(257*n)/254 bytes. ** In other words, the output will be expanded by as much as 3 ** bytes for every 254 bytes of input plus 2 bytes of fixed overhead. ** (This is approximately 2 + 1.0118*n or about a 1.2% size increase.) ** ** The return value is the number of characters in the encoded ** string, excluding the "\000" terminator. */
int sqlite3_encode_binary(const unsigned char *in, int n, unsigned char *out){
  int i, j, e, m;
  int cnt[256];
  if( n<=0 ){
    out[0] = 'x';
    out[1] = 0;
    return 1;
  }
  memset(cnt, 0, sizeof(cnt));
  for(i=n-1; i>=0; i--){ cnt[in[i]]++; }
  m = n;
  for(i=1; i<256; i++){
    int sum;
    if( i=='\'' ) continue;
    sum = cnt[i] + cnt[(i+1)&0xff] + cnt[(i+'\'')&0xff];
    if( sum<m ){
      m = sum;
      e = i;
      if( m==0 ) break;
    }
  }
  out[0] = e;
  j = 1;
  for(i=0; i<n; i++){
    int c = (in[i] - e)&0xff;
    if( c==0 ){
      out[j++] = 1;
      out[j++] = 1;
    }else if( c==1 ){
      out[j++] = 1;
      out[j++] = 2;
    }else if( c=='\'' ){
      out[j++] = 1;
      out[j++] = 3;
    }else{
      out[j++] = c;
    }
  }
  out[j] = 0;
  return j;
}

/* ** Decode the string "in" into binary data and write it into "out". ** This routine reverses the encoding created by sqlite3_encode_binary(). ** The output will always be a few bytes less than the input. The number ** of bytes of output is returned. If the input is not a well-formed ** encoding, -1 is returned. ** ** The "in" and "out" parameters may point to the same buffer in order ** to decode a string in place. */
int sqlite3_decode_binary(const unsigned char *in, unsigned char *out){
  int i, c, e;
  e = *(in++);
  i = 0;
  while( (c = *(in++))!=0 ){
    if( c==1 ){
      c = *(in++);
      if( c==1 ){
        c = 0;
      }else if( c==2 ){
        c = 1;
      }else if( c==3 ){
        c = '\'';
      }else{
        return -1;
      }
    }
    out[i++] = (c + e)&0xff;
  }
  return i;
}

使用方法

#include <iostream>

#include "CppSQLite3.h"
#include <ctime>

using namespace std;

const char * gszFile = "e:\\sqlite3\\test.db";

//测试Sqlite3的使用
void main1()
{
    cout << "hello sqlite3" << endl;

    try
    {
        int i, fld;
        time_t tmStart, tmEnd;
        CppSQLite3DB db;

        char *sql;

        cout << "SQLite Header Version: " << CppSQLite3DB::SQLiteHeaderVersion() << endl;
        cout << "SQLite Library Version: " << CppSQLite3DB::SQLiteLibraryVersion() << endl;
        cout << "SQLite Library Version Number: " << CppSQLite3DB::SQLiteLibraryVersionNumber() << endl;

        //remove(gszFile);
        db.open(gszFile);
        //插入数据
        cout << endl << "emp table exists=" << (db.tableExists("person") ? "TRUE" : "FALSE") << endl;
        // Create SQL statement
        sql = "CREATE TABLE person("  \
            "id INT PRIMARY KEY NOT NULL," \
            "name TEXT NOT NULL," \
            "age INT NOT NULL," \
            "address CHAR(50)," \
            "salary REAL );";
        //db.execDML(sql);
        //cout << endl << "emp table exists=" << (db.tableExists("person") ? "TRUE" : "FALSE") << endl;
        //cout << endl << "DML tests" << endl;

        sql = "insert into person values (1, 'David Beckham',34,'china person',3455.78);"\
            "insert into person values (2, 'changshuhang',33,'china person1',3455.34);"\
            "insert into person values (3, 'houyuzhu',37,'china person2',34534);"\
            "insert into person values (4, 'chengye',356,'china person3',45.78);"\
            "insert into person values (5, 'dujianfei',38,'china person4',3655.78);";
        int nRows = db.execDML(sql);
        cout << nRows << " rows inserted" << endl;

        //update
        /* sql = "update person set name = 'xijinping' where id = 5 ;"\ "update person set name = 'hujingtao' where address = 'china person2' ;"; int nRows = db.execDML(sql); cout << nRows << " rows updated" << endl; */

        //delete
        /* sql = "delete from person where id = 5 ;"\ "delete from person where address = 'china person2' ;"; int nRows = db.execDML(sql); cout << nRows << " rows updated" << endl; */

        /* // Query data and also show results of inserts into auto-increment field cout << endl << "Select statement test" << endl; CppSQLite3Query q = db.execQuery("select * from person order by id;"); for (fld = 0; fld < q.numFields(); fld++) { cout << q.fieldName(fld) << "(" << q.fieldDeclType(fld) << ")|"; } cout << endl; while (!q.eof()) { cout << q.fieldValue(0) << "|"; cout << q.fieldValue(1) << "|"; cout << q.fieldValue(2) << "|"; cout << q.fieldValue(3) << endl; q.nextRow(); } */

        /* // Fetch table at once, and also show how to use CppSQLiteTable::setRow() method cout << endl << "getTable() test" << endl; CppSQLite3Table t = db.getTable("select * from person order by id;"); for (fld = 0; fld < t.numFields(); fld++) { cout << t.fieldName(fld) << "|"; } cout << endl; for (int row = 0; row < t.numRows(); row++) { t.setRow(row); for (int fld = 0; fld < t.numFields(); fld++) { if (!t.fieldIsNull(fld)) cout << t.fieldValue(fld) << "|"; else cout << "NULL" << "|"; } cout << endl; } */

    }
    catch (CppSQLite3Exception& e)
    {
        cerr << e.errorCode() << ":" << e.errorMessage() << endl;
    }

    ////////////////////////////////////////////////////////////////////////////////
    // Loop until user enters q or Q
    ////////////////////////////////////////////////////////////////////////////////
    char c(' ');

    while (c != 'q' && c != 'Q')
    {
        cout << "Press q then enter to quit: ";
        cin >> c;
    }
}

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