Android Room : Each bind variable in the query must have a matching method

Question

I am using the android persistence library Room with Kotlin.

The Dao looks like this

@Dao
interface CountryDao {
    @Query("SELECT * FROM countries")
    fun loadAllCountried() : LiveData<List<CountryEntity>>

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    fun insertAll(products: List<CountryEntity>)

    @Query("SELECT * FROM countries WHERE id = :countryId")
    fun loadCountry(countryId: Int): LiveData<CountryEntity>

    @Query("SELECT * FROM countries WHERE id = :countryId")
    fun loadCountrySync(countryId: Int): CountryEntity

}

It seems good to me but I am getting this error

Error: Each bind variable in the query must have a matching method parameter. Cannot find method parameters for :countryId.

I can see the parameter is named as countryId, so what may be the issue?

FYI: Here is the generated code in CountryDao_Impl.java

@Override
public CountryEntity loadCountrySync(int arg0) {
  final String _sql = "SELECT * FROM countries WHERE id = ?";
  final RoomSQLiteQuery _statement = RoomSQLiteQuery.acquire(_sql, 1);
  int _argIndex = 1;
  final Cursor _cursor = __db.query(_statement);
  try {
    final int _cursorIndexOfId = _cursor.getColumnIndexOrThrow("id");
    final int _cursorIndexOfPopulation = _cursor.getColumnIndexOrThrow("population");
    final CountryEntity _result;
   if(_cursor.moveToFirst()) {
     _result = new CountryEntity();
      final int _tmpId;
      _tmpId = _cursor.getInt(_cursorIndexOfId);
      _result.setId(_tmpId);
      final long _tmpPopulation;
      _tmpPopulation = _cursor.getLong(_cursorIndexOfPopulation);
      _result.setPopulation(_tmpPopulation);
    } else {
      _result = null;
    }
    return _result;
  } finally {
    _cursor.close();
    _statement.release();
  }
}

In this method I see arg0 is not being used anywhere in the method.

EDIT: This seems to be fixed in the new plugins. Several of the answers here are correct, but I can't accept every answer, Sorry.

Answer 1

Kotlin isn't preserving the names of the arguments properly - this is https://youtrack.jetbrains.com/issue/KT-17959

You can work around this by using :arg0, :arg1, etc, as parameter names in your @Query statements:

@Query("SELECT * FROM countries WHERE id = :arg0")
fun loadCountry(countryId: Int): LiveData<CountryEntity>

@Query("SELECT * FROM countries WHERE id = :arg0")
fun loadCountrySync(countryId: Int): CountryEntity

Answer 2

This error occurs if you do not have apply plugin: 'kotlin-kapt' defined in your build.gradle file. If you do enable the kapt plugin, the compiler will match the binding parameter with the method arguments as expected.

Answer 3

With kotlin v.1.2.10 and higher in the project for me it works only by next way:

@Query("select * from user where pk = :userId")
fun findUserById(userId: Long): DBUser

names ":userId" in the query and "userId" in the method should be the same.

Answer 4

For me, this issue appeared when I change/add methods in either the DAO interface or database Entity classes, and I solved it by just Build > Clean Project followed by Build > Make Project. then run it.

Answer 5

This issue now can be fixed using 1.1.3-eap-85 and kotlin-kapt. Official tweet