How to save numbers in room database kotlin - kotlin

Question

I want to create a simple financial report app.
With opening balance, inventory purchase, other expenses, sales and banking all as double numbers I want to use room database, jetpack components

Answer 1

You can't ask this type of questions but look at this sample (simplest way to use roomDB)
First of all you need to define you database class
#Database(entities = [CompaniesModel::class, UserPoint::class], version = 15) //here is the models which will have the structure of your database
abstract class DataBase : RoomDatabase() {
/**
* define companies dao to make some quires
*/
abstract fun homeDao(): HomeDao
abstract fun companiesDao(): CompaniesListDao
companion object {
#Volatile
private var databaseInstance: DataBase? = null
fun getDatabaseInstance(mContext: Context): DataBase =
databaseInstance ?: synchronized(this) {
databaseInstance ?: buildDatabaseInstance(mContext).also {
databaseInstance = it
}
}
private fun buildDatabaseInstance(mContext: Context) =
Room.databaseBuilder(mContext, DataBase::class.java, "crm")
.fallbackToDestructiveMigration()
.allowMainThreadQueries()
.build()
}
}
and the models which contain the structure of your database
#Entity(tableName = "companiesModel")
data class CompaniesModel(
#PrimaryKey
#ColumnInfo(name = "id")
#SerializedName("id")
var id: Int,
#ColumnInfo(name = "name")
#SerializedName("name")
var name: String,
#ColumnInfo(name = "image")
#SerializedName("image")
var image: String
)
and the Dao which have all your queres
#Dao
interface CompaniesListDao {
/**
* this fun to insert data in room db after fetch data from server
*/
#Insert(onConflict = OnConflictStrategy.REPLACE)
fun insertCompanies(contactModel: List<CompaniesModel>)
/**
* this fun to get data from room db to make some caching in app
*/
#Query("SELECT * FROM companiesModel")
fun getCompaniesList(): List<CompaniesModel>
/**
* this fun to clear companies list from room db
*/
#Query("DELETE FROM companiesModel")
fun clearCompaniesList()
#Update
fun update(contactModel: List<CompaniesModel>)
}
to access the data you should call it like this
DataBase.getDatabaseInstance(App.instance).companiesDao().something