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Overview

This is updated version of original version of Extended Database Library Project which has several improvements:

  • This version creates a byte flag at the beginning of database header. This allows to check if Database is already created and readable.
  • Added EDB_ERROR status to EDB_Status
  • Now open() function returns EDB_OK if database is already created and readable, and returns EDB_ERROR if database is not created or readable
  • Added new example with External SD-card usage and AT24C512 I2C EEPROM with two Databases
  • Some common bugfixes

Extended Database Library Project Home at the Arduino Playground

Examples included:

Installing

Unzip the download into your Arduino-00xx/hardware/libraries directory. If the Arduino IDE is already running then exit and restart the Arduino IDE.

Quickstart

How to use in a nutshell:

  • include EDB.h
  • define a structure for your records
  • include an I/O interface such as EEPROM.h
  • declare an instance of EDB
  • pick an address in EEPROM for the table to start

Arduino Internal EEPROM Example

/*
   EDB_Simple.pde
   Extended Database Library + Internal Arduino EEPROM Demo Sketch

   The Extended Database library project page is here:
   http://www.arduino.cc/playground/Code/ExtendedDatabaseLibrary

 */

#include "Arduino.h"
#include <EDB.h>

// Use the Internal Arduino EEPROM as storage
#include <EEPROM.h>

// Uncomment the line appropriate for your platform
#define TABLE_SIZE 512 // Arduino 168 or greater

// The number of demo records that should be created.  This should be less
// than (TABLE_SIZE - sizeof(EDB_Header)) / sizeof(LogEvent).  If it is higher,
// operations will return EDB_OUT_OF_RANGE for all records outside the usable range.
#define RECORDS_TO_CREATE 10

// Arbitrary record definition for this table.
// This should be modified to reflect your record needs.
struct LogEvent {
    int id;
    int temperature;
}
logEvent;

// The read and write handlers for using the EEPROM Library
void writer(unsigned long address, byte data)
{
    EEPROM.write(address, data);
}

byte reader(unsigned long address)
{
    return EEPROM.read(address);
}

// Create an EDB object with the appropriate write and read handlers
EDB db(&writer, &reader);

void setup()
{
    Serial.begin(9600);
    Serial.println("Extended Database Library + Arduino Internal EEPROM Demo");
    Serial.println();

    EDB_Status result = db.open(0);
    if (result == EDB_ERROR) {
        db.create(0, TABLE_SIZE, sizeof(logEvent));
    }

    Serial.print("Record Count: "); Serial.println(db.count());

    Serial.println("Creating Records...");
    int recno;
    for (recno = 1; recno <= RECORDS_TO_CREATE; recno++)
    {
        logEvent.id = recno;
        logEvent.temperature = recno * 2;
        db.appendRec(EDB_REC logEvent);
    }

    Serial.print("Record Count: "); Serial.println(db.count());
    for (recno = 1; recno < RECORDS_TO_CREATE; recno++)
    {
        db.readRec(recno, EDB_REC logEvent);
        Serial.print("ID: "); Serial.println(logEvent.id);
        Serial.print("Temp: "); Serial.println(logEvent.temperature);
    }
}

void loop()
{
}

This is a re-implementation of the database library originally written by Madhusudana das found here:

http://www.arduino.cc/playground/Code/DatabaseLibrary