room DataBase

//main activity.kt

  



import android.os.Bundle
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent

import androidx.compose.foundation.layout.*
import androidx.compose.material3.Button
import androidx.compose.material3.OutlinedTextField
import androidx.compose.material3.Text
import androidx.compose.runtime.*
import androidx.compose.ui.Modifier
import androidx.compose.ui.unit.dp
import androidx.compose.ui.platform.LocalContext
import androidx.compose.ui.tooling.preview.Preview
import com.example.myapplication.ui.theme.User
import com.example.myapplication.ui.theme.UserDatabase
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            val database = UserDatabase.getInstance(this)
            InsertRecord(database)
        }
    }
}

@Composable
fun InsertRecord(database: UserDatabase) {
    val context = LocalContext.current
    val userDao = database.userDao()

    var name by remember { mutableStateOf("") }
    var phone by remember { mutableStateOf("") }

    val scope = rememberCoroutineScope()

    Column(modifier = Modifier.fillMaxSize().padding(16.dp)) {
        Text(text = "Enter your details here")
        Spacer(modifier = Modifier.height(25.dp))

        OutlinedTextField(
            value = name,
            onValueChange = { name = it },
            label = { Text(text = "Enter your name") },
            modifier = Modifier.fillMaxWidth()
        )
        Spacer(modifier = Modifier.height(25.dp))

        OutlinedTextField(
            value = phone,
            onValueChange = { phone = it },
            label = { Text(text = "Enter your phone number") },
            modifier = Modifier.fillMaxWidth()
        )
        Spacer(modifier = Modifier.height(25.dp))

        Button(onClick = {
            scope.launch(Dispatchers.IO) {
                userDao.insert(User(username = name, phone = phone))
            }
            Toast.makeText(context, "Record Inserted Successfully", Toast.LENGTH_LONG).show()
        }) {
            Text(text = "Insert Now")
        }
    }
}

@Preview(showBackground = true)
@Composable
fun PreviewInsertRecord() {
    val mockDatabase = UserDatabase.getInstance(context = LocalContext.current) // Use a mock database for preview
    InsertRecord(mockDatabase)
}

//  user.kt(create data class file)

  



import androidx.room.Entity
import androidx.room.PrimaryKey

@Entity(tableName = "users")
data class User(
    @PrimaryKey(autoGenerate = true) val uid: Int? = null,
    val username: String,
    val phone: String
)
{
}

//  userdao.kt(create interface)

  package com.example.myapplication.ui.theme



import androidx.room.Dao
import androidx.room.Insert

@Dao
interface UserDAO {
    @Insert
    suspend fun insert(user: User)
}

//  userdatabase.kt(create class file)

  

import android.content.Context
import androidx.room.Database
import androidx.room.Room
import androidx.room.RoomDatabase

@Database(entities = [User::class], version = 1)
abstract class UserDatabase : RoomDatabase() {
    abstract fun userDao(): UserDAO

    companion object {
        @Volatile
        private var INSTANCE: UserDatabase? = null

        fun getInstance(context: Context): UserDatabase {
            return INSTANCE ?: synchronized(this) {
                val instance = Room.databaseBuilder(
                    context.applicationContext,
                    UserDatabase::class.java,
                    "user_database"
                ).build()
                INSTANCE = instance
                instance
            }
        }
    }
}
//plugins{
//  kotlin("kapt")
//}
//dependendcies{
 // val room_version="2.6.1"
   // implementation("androidx.room:room-runtime:$room_version")
  //  kapt("androidx.room:room-compiler:$room_version") // for annotation processing
   // implementation("androidx.room:room-ktx:$room_version")
//}
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