![\"clip_image006\"](\"https:\/\/devblogs.microsoft.com\/wp-content\/uploads\/sites\/31\/2019\/04\/clip_image006_thumb11.jpg\" "\\"clip_image006\\"")
<\/a><\/p>\nBasic read operations<\/h5>\n
To read data at a path and listen for changes, use the on() or once() method of firebase.database.Reference to observe events.<\/p>\n
You can use the value event to read a snapshot of the contents at a given path, as they existed at the time of the event. The event callback is passed a snapshot containing all data at that location, including child data. If there is no data, the snapshot returned is null.<\/p>\n
1. Using .on()<\/p>\n
var user_ref = firebase.database().ref('users');\r\nuser_ref.on('value', function(snapshot) {\r\n\u00a0\u00a0 handleUserData(snapshot.val());\r\n});<\/pre>\nIn the above example, we are referencing the users path which will contain multiple user objects. The listener receives a snapshot that contains this data at the time of the event. We can pull the data from snapshot using the val() method.<\/p>\n
2. Using.once()<\/p>\n
Sometimes we want to get a snapshot of our data without listening for changes and we don\u2019t expect our UI element to change with new values. In this situation, the once() method simplifies getting data as it triggers only once.<\/p>\n
var userId = firebase.auth().currentUser.uid;\r\nreturn firebase.database().ref('\/users\/' + userId).once('value').then(function(snapshot) {\r\n\u00a0\u00a0 var username = snapshot.val().username);\r\n\u00a0\u00a0 \/\/ ...\r\n});<\/pre>\nIn the above example, we get the current users UID and navigate to the users\/uid path in our DB, where we pull the specific information regarding that user in our snapshot. We can then save the values the same way using snapshot.val().\u2019Attribute_Name\u2019<\/p>\n
Delete Data<\/h5>\n
The last of the CRUD functionality is Deleting data and the simplest way to delete data with firebase is to call .remove() on a specified reference to the location of the data we want to delete.<\/p>\n
You can all use .set() to update data to Null at a specific reference point.<\/p>\n
\/\/ To delete a user from our Database\r\nvar userId = firebase.auth().currentUser.uid;\r\nreturn firebase.database().ref('\/users\/' + userId).remove();<\/pre>\nFirebase is a simple tool that comes in handy when building small projects or proof of concepts. If you\u2019re looking for something more robust, scalable and appropriate for production environment, Azure Storage provides all of that functionality and more. If you are interested in some similarities and differences between Firebase and Azure Storage, be on the lookout for my next blog where I\u2019ll be comparing the two.<\/p>\n","protected":false},"excerpt":{"rendered":"
In this post, Premier Developer Consultant, Kunal Sinha outlines steps to integrate Firebase Database into custom web applications as a NoSql alternative for quick POC demos. I was recently working on building out a Node JS web application POC for one of my projects and wanted to try out a new database service. As this […]<\/p>\n","protected":false},"author":583,"featured_media":37840,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-17075","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-permierdev"],"acf":[],"blog_post_summary":"
In this post, Premier Developer Consultant, Kunal Sinha outlines steps to integrate Firebase Database into custom web applications as a NoSql alternative for quick POC demos. I was recently working on building out a Node JS web application POC for one of my projects and wanted to try out a new database service. As this […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/posts\/17075","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/users\/583"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/comments?post=17075"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/posts\/17075\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/media\/37840"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/media?parent=17075"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/categories?post=17075"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/premier-developer\/wp-json\/wp\/v2\/tags?post=17075"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"\"](\"http:\/\/devblogs.microsoft.com\/premier-developer\/wp-content\/uploads\/sites\/31\/2018\/01\/fire1.jpg\")
<\/p>\n![\"\"](\"http:\/\/devblogs.microsoft.com\/premier-developer\/wp-content\/uploads\/sites\/31\/2018\/01\/fire2.jpg\")
<\/p>\n