xahaud/modules/ripple_app/data/ripple_SqliteDatabase.h

//------------------------------------------------------------------------------
/*
    Copyright (c) 2011-2013, OpenCoin, Inc.
*/
//==============================================================================

#ifndef RIPPLE_SQLITEDATABASE_RIPPLEHEADER
#define RIPPLE_SQLITEDATABASE_RIPPLEHEADER

class SqliteDatabase
    : public Database
    , LeakChecked <SqliteDatabase>
{
public:
    explicit SqliteDatabase (char const* host);

    void connect ();
    void disconnect ();

    // returns true if the query went ok
    bool executeSQL (const char* sql, bool fail_okay);

    // tells you how many rows were changed by an update or insert
    int getNumRowsAffected ();

    // returns false if there are no results
    bool startIterRows (bool finalize);
    void endIterRows ();

    // call this after you executeSQL
    // will return false if there are no more rows
    bool getNextRow (bool finalize);

    bool getNull (int colIndex);
    char* getStr (int colIndex, std::string& retStr);
    int32 getInt (int colIndex);
    float getFloat (int colIndex);
    bool getBool (int colIndex);
    // returns amount stored in buf
    int getBinary (int colIndex, unsigned char* buf, int maxSize);
    Blob getBinary (int colIndex);
    uint64 getBigInt (int colIndex);

    sqlite3* peekConnection ()
    {
        return mConnection;
    }
    sqlite3*    getAuxConnection ();
    virtual bool setupCheckpointing (JobQueue*);
    virtual SqliteDatabase* getSqliteDB ()
    {
        return this;
    }

    void runWal ();
    void doHook (const char* db, int walSize);

    int getKBUsedDB ();
    int getKBUsedAll ();

private:
    ThreadWithCallQueue m_thread;

    sqlite3* mConnection;
    // VFALCO TODO Why do we need an "aux" connection? Should just use a second SqliteDatabase object.
    sqlite3* mAuxConnection;
    sqlite3_stmt* mCurrentStmt;
    bool mMoreRows;

    boost::mutex            walMutex;
    JobQueue*               mWalQ;
    bool                    walRunning;
};

class SqliteStatement
{
private:
    SqliteStatement (const SqliteStatement&);               // no implementation
    SqliteStatement& operator= (const SqliteStatement&);    // no implementation

protected:
    sqlite3_stmt* statement;

public:
    // VFALCO TODO This is quite a convoluted interface. A mysterious "aux" connection? 
    //             Why not just have two SqliteDatabase objects?
    //
    SqliteStatement (SqliteDatabase* db, const char* statement, bool aux = false);
    SqliteStatement (SqliteDatabase* db, const std::string& statement, bool aux = false);
    ~SqliteStatement ();

    sqlite3_stmt* peekStatement ();

    // positions start at 1
    int bind (int position, const void* data, int length);
    int bindStatic (int position, const void* data, int length);
    int bindStatic (int position, Blob const& value);

    int bind (int position, const std::string& value);
    int bindStatic (int position, const std::string& value);

    int bind (int position, uint32 value);
    int bind (int position);

    // columns start at 0
    int size (int column);

    const void* peekBlob (int column);
    Blob getBlob (int column);

    std::string getString (int column);
    const char* peekString (int column);
    uint32 getUInt32 (int column);
    int64 getInt64 (int column);

    int step ();
    int reset ();

    // translate return values of step and reset
    bool isOk (int);
    bool isDone (int);
    bool isRow (int);
    bool isError (int);
    std::string getError (int);
};

#endif

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