如何从Firebase实时数据库查询？

Question

How to get all the books of a specific author from my database?

Here is a snapshot of my database, i want to get "Colson Whitehead"

for web development, javascript.

Answer 1

To get all books by author Colson Whitehead, you do a query like this:

var query = firebase.database().ref("books").orderByChild("author").equalTo("Colson Whitehead");
query.on("value", function(snapshot) {
  snapshot.forEach(function(bookSnapshot) {
    console.log(bookSnapshot.key+": "+bookSnapshot.val());
  });
})

This callback will get called initially and then every time something about the books by Colson Whitehead changes. If you only want the initial call, use once instead of on .