Login multi pengguna android studio mysql
Aplikasi yang menangani jumlah data terstruktur yang tidak sepele bisa mendapatkan keuntungan besar dengan mempertahankan data tersebut secara lokal. Kasus penggunaan yang paling umum adalah meng-cache bagian data yang relevan sehingga saat perangkat tidak dapat mengakses jaringan, pengguna masih dapat menjelajahi konten tersebut saat sedang offline Show Pustaka persistensi Room menyediakan lapisan abstraksi di atas SQLite untuk memungkinkan akses database yang lancar sambil memanfaatkan kekuatan penuh SQLite. Secara khusus, Room memberikan manfaat berikut
Karena pertimbangan ini, kami sangat menyarankan agar Anda menggunakan Room daripada menggunakan API SQLite secara langsung MempersiapkanUntuk menggunakan Room di aplikasi Anda, tambahkan dependensi berikut ke file dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }2 aplikasi Anda
Komponen primerAda tiga komponen utama di Room
Kelas database menyediakan aplikasi Anda dengan instance DAO yang terkait dengan database tersebut. Pada gilirannya, aplikasi dapat menggunakan DAO untuk mengambil data dari database sebagai instance dari objek entitas data terkait. Aplikasi juga dapat menggunakan entitas data yang ditentukan untuk memperbarui baris dari tabel yang sesuai, atau membuat baris baru untuk penyisipan. Gambar 1 mengilustrasikan hubungan antara berbagai komponen Room Gambar 1. Diagram arsitektur perpustakaan ruanganImplementasi sampelBagian ini menyajikan contoh implementasi database Room dengan entitas data tunggal dan DAO tunggal entitas dataKode berikut mendefinisikan entitas data dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }3. Setiap instance dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }_3 mewakili baris dalam tabel dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }5 di database aplikasi
Untuk mempelajari lebih lanjut tentang entitas data di Room, lihat Menentukan data menggunakan entitas Room Objek akses data (DAO)Kode berikut mendefinisikan DAO yang disebut dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }6. dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }6 menyediakan metode yang digunakan aplikasi lainnya untuk berinteraksi dengan data di tabel dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }5
Untuk mempelajari DAO lebih lanjut, lihat Mengakses data menggunakan DAO Room Basis dataKode berikut mendefinisikan kelas dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }_9 untuk menampung database. dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }_9 menentukan konfigurasi database dan berfungsi sebagai titik akses utama aplikasi ke data yang disimpan. Kelas database harus memenuhi kondisi berikut
Catatan. Jika aplikasi Anda berjalan dalam satu proses, Anda harus mengikuti pola desain tunggal saat membuat instance objek dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }9. Setiap instans @Entity data class User( @PrimaryKey val uid: Int, @ColumnInfo(name = "first_name") val firstName: String?, @ColumnInfo(name = "last_name") val lastName: String? )_3 cukup mahal, dan Anda jarang memerlukan akses ke banyak instans dalam satu proses Jika aplikasi Anda berjalan dalam beberapa proses, sertakan @Entity data class User( @PrimaryKey val uid: Int, @ColumnInfo(name = "first_name") val firstName: String?, @ColumnInfo(name = "last_name") val lastName: String? )6 dalam pemanggilan pembuat database Anda. Dengan begitu, ketika Anda memiliki instance dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }9 di setiap proses, Anda dapat membatalkan file database bersama dalam satu proses, dan pembatalan ini secara otomatis menyebar ke instance dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }9 dalam proses lain PenggunaanSetelah Anda menentukan entitas data, DAO, dan objek database, Anda dapat menggunakan kode berikut untuk membuat instance database
Anda kemudian dapat menggunakan metode abstrak dari dependencies { val room_version = "2.5.0" implementation("androidx.room:room-runtime:$room_version") annotationProcessor("androidx.room:room-compiler:$room_version") // To use Kotlin annotation processing tool (kapt) kapt("androidx.room:room-compiler:$room_version") // To use Kotlin Symbol Processing (KSP) ksp("androidx.room:room-compiler:$room_version") // optional - Kotlin Extensions and Coroutines support for Room implementation("androidx.room:room-ktx:$room_version") // optional - RxJava2 support for Room implementation("androidx.room:room-rxjava2:$room_version") // optional - RxJava3 support for Room implementation("androidx.room:room-rxjava3:$room_version") // optional - Guava support for Room, including Optional and ListenableFuture implementation("androidx.room:room-guava:$room_version") // optional - Test helpers testImplementation("androidx.room:room-testing:$room_version") // optional - Paging 3 Integration implementation("androidx.room:room-paging:$room_version") }9 untuk mendapatkan instance DAO. Pada gilirannya, Anda dapat menggunakan metode dari instance DAO untuk berinteraksi dengan database Bagaimana cara terhubung ke database MySQL di Android Studio?Ini adalah saat pengguna telah mendaftar. . Langkah 1. Buat database mySQL di phpMyAdmin. . Langkah 2. Buat 3 file php. . Langkah 3. Komponen harus ada di Android Studio. . Langkah 4. Desain activity_main. xml. . Langkah 5. Buat kelas bernama Design the. . Langkah 6. Tulis kode di MainActivity. Jawa. . Langkah 7. Anda dapat menguji aplikasi Anda Bagaimana cara membuat form login multi user di Java menggunakan database MySQL?addActionListener(new ActionListener() { public void actionPerformed(ActionEvent arg0) { String sql = "SELECT * FROM useRecords "; try { ps = conn. prepStatement(sql); . mengeksekusiQuery(); . getText(); . . mysql autentikasi jframe tipe Pengguna |