How to define a not null field for a table of SQLite when I use Anko in Kotlin?

Question

I hope to define a not null field for a table of SQLite when I use Anko in Kotlin.

But DBRecordTable.Category to TEXT NOT NULL is wrong ,how can I fix it?

Code

  implementation "org.jetbrains.anko:anko-sqlite:$anko_version"

  override fun onCreate(db: SQLiteDatabase) {
        db.createTable( DBRecordTable.TableNAME , true,
            DBRecordTable._ID to INTEGER + PRIMARY_KEY+ AUTOINCREMENT,
            DBRecordTable.Category to TEXT NOT NULL,    //It's wrong
            DBRecordTable.Content to TEXT,
            DBRecordTable.IsFavorite to INTEGER  +DEFAULT("0"),
            DBRecordTable.IsProtected to INTEGER  +DEFAULT("0"),
            DBRecordTable.CreatedDate to INTEGER
        )
    }

Answer 1

By taking a look at sqlTypes.kt we can find that the not null constraint is defined as following:

val NOT_NULL: SqlTypeModifier = SqlTypeModifierImpl("NOT NULL")

So your code should be:

override fun onCreate(db: SQLiteDatabase) {
    db.createTable( DBRecordTable.TableNAME , true,
        DBRecordTable._ID to INTEGER + PRIMARY_KEY + AUTOINCREMENT,
        DBRecordTable.Category to TEXT + NOT_NULL,
        DBRecordTable.Content to TEXT,
        DBRecordTable.IsFavorite to INTEGER + DEFAULT("0"),
        DBRecordTable.IsProtected to INTEGER + DEFAULT("0"),
        DBRecordTable.CreatedDate to INTEGER
    )
}

Answer 2

We used these lines of code and it works great table created

private val dbName = THE_PATH +"JSANotes.db"
private val dbTable = "Notes"
private val colId = "Id"
private val colTitle = "Title"
private val colContent = "Content"
private val dbVersion = 1

private val CREATE_TABLE_SQL = "CREATE TABLE IF NOT EXISTS " + dbTable + " (" + colId + " INTEGER PRIMARY KEY," + colTitle + " TEXT, " + colContent + " TEXT NOT NULL);"
private var db: SQLiteDatabase? = null

init {
    val dbHelper = DatabaseHelper(context)
    db = dbHelper.writableDatabase
}

This site will help with a lot of SQLite questions LINK

We do not use the NOT NULL we do this in place of NOT NULL

            if(edtContent.text.toString().equals("")){
            error("ENTER Content")
            edtContent.requestFocus()
            return@setOnClickListener
        }

You can also test for length the error message shows in a Text View at the bottom of the Activity with this code

        fun error(msg:String){
        object : CountDownTimer(4000, 1000) {
            override fun onTick(millisUntilFinished: Long) {
                tvError.visibility = View.VISIBLE
                tvError.setText(msg)
            }
            override fun onFinish() {
                tvError.visibility = View.INVISIBLE
                tvError.setText("")
            }
        }.start()
    }