在firebase中使用where子句检索数据

{
  "users": [
    { "id": 1, "name": "Alice", "age": 30 },
    { "id": 2, "name": "Bob", "age": 25 },
    { "id": 3, "name": "Charlie", "age": 35 }
  ]
}

const firebase = require("firebase/app");
require("firebase/firestore");

const firebaseConfig = {
  // ...你的 Firebase 配置
};

firebase.initializeApp(firebaseConfig);
const db = firebase.firestore();

db.collection("users")
  .where("age", ">", 25)
  .get()
  .then((querySnapshot) => {
    querySnapshot.forEach((doc) => {
      console.log(doc.id, " => ", doc.data());
    });
  })
  .catch((error) => {
    console.log("Error getting documents: ", error);
  });

db.collection("users")
  .where("name", "==", "Alice")
  .get()
  .then((querySnapshot) => {
    querySnapshot.forEach((doc) => {
      console.log(doc.id, " => ", doc.data());
    });
  })
  -catch((error) => {
    console.log("Error getting documents: ", error);
  });

{
  "users": {
    "1": { "name": "Alice", "age": 30 },
    "2": { "name": "Bob", "age": 25 },
    "3": { "name": "Charlie", "age": 35 }
  }
}

const firebase = require("firebase/app");
require("firebase/database");

const firebaseConfig = {
  // ...你的 Firebase 配置
};

firebase.initializeApp(firebaseConfig);
const db = firebase.database();

db.ref("users")
  .orderByChild("age")
  .startAt(25)
  .endAt(35)
  .once("value", (snapshot) => {
    snapshot.forEach((childSnapshot) => {
      console.log(childSnapshot.key, " => ", childSnapshot.val());
    });
  })
  .catch((error) => {
    console.log("Error getting data: ", error);
  });