Check whether database is empty

Question

I am trying to check if a sqlite database is empty using

public boolean chkDB(){
        boolean chk = false;
        Cursor mCursor = db.rawQuery(\"SELECT          


        

Answer 1

In Kotlin you can do just that

package myapp.package.name
import android.content.Context

class SQLiteDatabaseCrud(context: Context) {
    private val dbHelper: DBHelper = DBHelper(context)
    private var chk = false
    fun isEmpty(): Boolean? {
        val db = dbHelper.readableDatabase
        val cursor = db.rawQuery("SELECT * FROM " + Business.TABLE, null)
        chk = if (cursor != null){
            cursor.moveToFirst()
            cursor.count != 0
        }else{
            true
        }
        cursor.close()
        return chk
    }
}

So in your activity you just call the function

 private var mSQLiteDatabaseCrud: SQLiteDatabaseCrud? = null

 mSQLiteDatabaseCrud = SQLiteDatabaseCrud(applicationContext)
    if(mSQLiteDatabaseCrud?.isEmpty()!!){
        Toast.makeText(applicationContext,"database is not empty", Toast.LENGTH_SHORT).show()       
    }else{
        performRequest()
        Toast.makeText(applicationContext,"empty database", Toast.LENGTH_SHORT).show()
    }