Thank you for your quick comments last time. Also thank you
for the excellent library.
I was able to get the first level firebase access going with your kind comments last time.
I hope you can help me for this as well.
The problem I am having is using query with a second level data in the realtime database.
I took the Basic.ino and updated it as before. This time I inserted a second level data
when the code runs and accesses the firebase the first time. Then in the loop, I try to access the two level deep data : /post/post2.
================================ Basic.ino modified Code:
/*
* Created by K. Suwatchai (Mobizt)
*
* Email: [email protected]
*
* Github: https://github.com/mobizt
*
* Copyright (c) 2019 mobizt
*
*/
//This example shows how to read, store and update database using get, set, push and update functions.
//Required HTTPClientESP32Ex library to be installed https://github.com/mobizt/HTTPClientESP32Ex
#include <WiFi.h>
#include "FirebaseESP32.h"
#include "mycredentials.h"
#include <Preferences.h>
#include <ArduinoJson.h>
#define FIREBASE_HOST MYHOST //Do not include https:// in FIREBASE_HOST
#define FIREBASE_AUTH MYDBSECRET
#define WIFI_SSID mySSID
#define WIFI_PASSWORD myPWD
FirebaseData firebaseData;
static int av1 = 0; // add some values into strings
static int av2 = 1;
void pushmyData() {
String k1 = "{\"data1\":\"value";
String k2 = "\", \"data2\":{\"child2\":\"_value";
String ke = "\"}}";
//String updateData = "{\"data1\":\"value\", \"data2\":{\"child2\":\"_value\"}}";
String updateData = k1+String(av1)+k2+String(av2)+ke;
av1++;
av2++;
String s= "Kaboom"+String(av2);
String s_json = "{\"NewData\":\"Kaboom"+String(av2)+"\"}";
Serial.println(" My s_json string is : "+s_json);
String SecondLevel = "{\"post\":{\"post1\":{\"author\":\"TOM\",\"vegitable\":\"tomato\"},\"post2\":{\"author\":\"JERRY\",\"vegitable\":\"potato\"}}}";
if(av1 == 1 ) {
if( Firebase.setString(firebaseData, "/NewData", s) ) {
Serial.println("Done setString /NewData:"+s); // should post "Kaboom2" to node "NewData"
} else {
Serial.println(firebaseData.errorReason());
}
if( Firebase.updateNode(firebaseData, "/", SecondLevel) ) {
Serial.println("Done second level setString /:"+SecondLevel); // should pust "Kaboom2" to node "NewData"
} else {
Serial.println(firebaseData.errorReason());
}
} else {
if (Firebase.updateNode(firebaseData, "/", s_json)) { // should add "Kaboom3" to "Kaboom2"
Serial.println("Done updateNode "+s_json); // Check firebase data base, to see if
} else { // The value of NewData is "Kaboom2Kaboom3"
Serial.println(firebaseData.errorReason()); // does not seem to be working
}
}
if (Firebase.updateNode(firebaseData, "/", updateData)) {
//Success, then try to read the payload value
//Database path that updated
Serial.println(firebaseData.dataPath());
//Data type at updated database path
Serial.println(firebaseData.dataType()); //Should be "json" -- yes it is
//Print the JSON string payload that returned from server
Serial.println(firebaseData.jsonData()); //OK, this works
//Actual sent payload JSON data
Serial.println(updateData);
} else {
//Failed, then print out the error detail
Serial.println(firebaseData.errorReason());
}
}
// call this routine in loop to see values that are read back
void query_firebase () {
QueryFilter query;
query.orderBy("data1"); // try to get only data1
if (Firebase.getJSON(firebaseData, "/", query)) // gets the complete data base at "/"
{
//Success, then try to read the JSON payload value
Serial.println(firebaseData.jsonData()); // prints everything, even if there is a ".indexOn": "data1" on-line at firebase
}
else
{
//Failed to get JSON data at defined database path, print out the error reason
Serial.println(firebaseData.errorReason());
}
//Clear all query parameters
query.clear();
}
// call GetSpecificData() in the main loop, and see if you can get specific
// data for node data2, child _data2, with the value
void GetSpecificData() {
QueryFilter query;
query.orderBy("child2");;
String k="No News";
if(Firebase.getString(firebaseData,"/NewData", k) ) {
Serial.println("Got NewData as: "+k);
} else {
Serial.println(firebaseData.errorReason());
}
if (Firebase.getJSON(firebaseData, "/data2", query)) {
//Success, then read the payload value
//Make sure payload value returned from server is integer
//This prevent you to get garbage data
StaticJsonBuffer<200> jsonBuffer;
JsonObject& mData = jsonBuffer.parseObject(firebaseData.jsonData());
mData.printTo(Serial);
Serial.println("");
const char* val = mData["child2"];
Serial.print("Value extracted from json key value pair: ");
Serial.println(val);
} else {
//Failed, then print out the error detail
Serial.println(firebaseData.errorReason());
}
//Clear all query parameters
query.clear();
}
void GetSpecificSecondLevelData() {
QueryFilter query;
query.orderBy("post2");
if (Firebase.getJSON(firebaseData, "/post", query)) {
StaticJsonBuffer<200> jsonBuffer;
JsonObject& mData = jsonBuffer.parseObject(firebaseData.jsonData());
mData.printTo(Serial);
Serial.println("");
const char* val = mData["vegitable"];
Serial.print("Posted Value extracted from vegitable: ");
Serial.println(val);
} else {
//Failed, then print out the error detail
Serial.println(firebaseData.errorReason());
}
//Clear all query parameters
query.clear();
}
//////
void setup()
{
Serial.begin(115200);
Serial.println();
Serial.println();
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
Serial.print("Connecting to Wi-Fi");
while (WiFi.status() != WL_CONNECTED)
{
Serial.print(".");
delay(300);
}
Serial.println();
Serial.print("Connected with IP: ");
Serial.println(WiFi.localIP());
Serial.println();
Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
Firebase.reconnectWiFi(true);
Firebase.setMaxRetry(firebaseData, 3);
Firebase.setMaxErrorQueue(firebaseData, 30);
}
void loop()
{
#define SomeDelay 10000
Serial.println("======================== Pushing data ================================");
pushmyData();
delay(SomeDelay);
Serial.println("======================== Get specific data ================================");
GetSpecificData();
delay(SomeDelay);
Serial.println("======================== query specific second level data ================================");
GetSpecificSecondLevelData(); //query_firebase ();
delay(SomeDelay);
}
================= Firebase realtime db
{
"NewData" : "Kaboom4",
"data1" : "value2",
"data2" : {
"child2" : "_value3"
},
"post" : {
"post1" : {
"author" : "TOM",
"vegitable" : "tomato"
},
"post2" : {
"author" : "JERRY",
"vegitable" : "potato"
}
}
}
====================== rules
{
"rules": {
".indexOn": ["post",
"post/post1",
"post/post2",
"post/post1/author",
"post/post1/vegitable",
"post1/author",
"post1/vegitable",
"post/post2/author",
"post/post2/vegitable",
"post2/author",
"post2/vegitable",
"NewData",
"data1",
"data2/child2",
"child2"],
"post":{
".read": true,
".write": true,
".indexOn": ["post1","post2"],
"post1":{
".indexOn":["author", "vegitable"],
"author": {
".read": true,
".write": true
},
"vegitable": {
".read": true,
".write": true
}
},
"post2": {
".indexOn":["author", "vegitable"],
"author": {
".read": true,
".write": true
},
"vegitable": {
".read": true,
".write": true
}
}
},
"NewData": {
".read": true,
".write": true
},
"data1": {
".read": true,
".write": true
},
"data2": {
".indexOn": "child2",
"child2": {
".read":true,
".write":true
}
}
}
}
====================== Output
======================== Pushing data ================================
My s_json string is : {"NewData":"Kaboom2"}
Done setString /NewData:Kaboom2
Done second level setString /:{"post":{"post1":{"author":"TOM","vegitable":"tomato"},"post2":{"author":"JERRY","vegitable":"potato"}}}
/
json
{"data1":"value0","data2":{"child2":"_value1"}}
{"data1":"value0", "data2":{"child2":"_value1"}}
======================== Get specific data ================================
Got NewData as: Kaboom2
{"child2":"_value1"}
Value extracted from json key value pair: _value1
======================== query specific second level data ================================
{}
Posted Value extracted from vegitable:
======================== Pushing data ================================
My s_json string is : {"NewData":"Kaboom3"}
Done updateNode {"NewData":"Kaboom3"}
/
json
{"data1":"value1","data2":{"child2":"_value2"}}
{"data1":"value1", "data2":{"child2":"_value2"}}
======================== Get specific data ================================
Got NewData as: Kaboom3
{"child2":"_value2"}
Value extracted from json key value pair: _value2
======================== query specific second level data ================================
{}
Posted Value extracted from vegitable:
======================== Pushing data ================================
My s_json string is : {"NewData":"Kaboom4"}
Done updateNode {"NewData":"Kaboom4"}
/
json
{"data1":"value2","data2":{"child2":"_value3"}}
{"data1":"value2", "data2":{"child2":"_value3"}}
======================== Get specific data ================================
Got NewData as: Kaboom4
{"child2":"_value3"}
Value extracted from json key value pair: _value3
======================== query specific second level data ================================
{}
Posted Value extracted from vegitable:
======================== Pushing data ================================
My s_json string is : {"NewData":"Kaboom5"}
Done updateNode {"NewData":"Kaboom5"}
/
json
{"data1":"value3","data2":{"child2":"_value4"}}
{"data1":"value3", "data2":{"child2":"_value4"}}
======================== Get specific data ================================
Got NewData as: Kaboom5
{"child2":"_value4"}
Value extracted from json key value pair: _value4
======================== query specific second level data ================================
{}
Posted Value extracted from vegitable:
======================== Pushing data ================================
My s_json string is : {"NewData":"Kaboom6"}
Done updateNode {"NewData":"Kaboom6"}
/
json
{"data1":"value4","data2":{"child2":"_value5"}}
{"data1":"value4", "data2":{"child2":"_value5"}}
======================== Get specific data ================================
Got NewData as: Kaboom6
{"child2":"_value5"}
Value extracted from json key value pair: _value5
======================== query specific second level data ================================
{}
Posted Value extracted from vegitable:
======================== Pushing data ================================
My s_json string is : {"NewData":"Kaboom7"}
Done updateNode {"NewData":"Kaboom7"}
/
json
{"data1":"value5","data2":{"child2":"_value6"}}
{"data1":"value5", "data2":{"child2":"_value6"}}
======================== Get specific data ================================
Got NewData as: Kaboom7
{"child2":"_value6"}
Value extracted from json key value pair: _value6
======================== query specific second level data ================================
{}
Posted Value extracted from vegitable:
======================== Pushing data ================================
My s_json string is : {"NewData":"Kaboom8"}
Done updateNode {"NewData":"Kaboom8"}
/
json
{"data1":"value6","data2":{"child2":"_value7"}}
{"data1":"value6", "data2":{"child2":"_value7"}}
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