RoomWarnings

Kotlin |Java

open class RoomWarnings

kotlin.Any
↳	androidx.room.RoomWarnings

The list of warnings that are produced by Room.

You can use these values inside a SuppressWarnings annotation to disable the warnings.

Summary

Constants
static String	CANNOT_CREATE_VERIFICATION_DATABASE Reported when Room cannot verify database queries during compilation.
static String	CURSOR_MISMATCH The warning dispatched by Room when the return value of a Query method does not exactly match the fields in the query result.
static String	DEFAULT_CONSTRUCTOR Reported when a POJO has multiple constructors, one of which is a no-arg constructor.
static String	INDEX_FROM_EMBEDDED_ENTITY_IS_DROPPED Reported when an Entity that has a Embeddedd field whose type is another Entity and that Entity has some indices defined.
static String	INDEX_FROM_EMBEDDED_FIELD_IS_DROPPED Reported when an Entity field that is annotated with Embedded has a sub field which has a ColumnInfo annotation with index = true.
static String	INDEX_FROM_PARENT_FIELD_IS_DROPPED Reported when an Entity inherits a field from its super class and the field has a ColumnInfo annotation with index = true.
static String	INDEX_FROM_PARENT_IS_DROPPED Reported when an Entity's parent declares an Index.
static String	MISSING_INDEX_ON_FOREIGN_KEY_CHILD When there is a foreign key from Entity A to Entity B, it is a good idea to index the reference columns in B, otherwise, each modification on Entity A will trigger a full table scan on Entity B.
static String	MISSING_JAVA_TMP_DIR Reported when Room cannot verify database queries during compilation due to lack of tmp dir access in JVM.
static String	MISSING_SCHEMA_LOCATION Reported when a `room.
static String	PRIMARY_KEY_FROM_EMBEDDED_IS_DROPPED Reported when an Entity field that is annotated with Embedded has a sub field which is annotated with PrimaryKey but the PrimaryKey is dropped while composing it into the parent object.
static String	RELATION_QUERY_WITHOUT_TRANSACTION Reported when a @Query method returns a POJO that has relations but the method is not annotated with @Transaction.
static String	RELATION_TYPE_MISMATCH Reported when a Relation Entity's SQLite column type does not match the type in the parent.

Public constructors
<init>()

Constants

CANNOT_CREATE_VERIFICATION_DATABASE

static val CANNOT_CREATE_VERIFICATION_DATABASE: String

Reported when Room cannot verify database queries during compilation. This usually happens when it cannot find the SQLite JDBC driver on the host machine.

Room can function without query verification but its functionality will be limited.

Value: "ROOM_CANNOT_CREATE_VERIFICATION_DATABASE"

CURSOR_MISMATCH

static val CURSOR_MISMATCH: String

The warning dispatched by Room when the return value of a Query method does not exactly match the fields in the query result.

Value: "ROOM_CURSOR_MISMATCH"

DEFAULT_CONSTRUCTOR

static val DEFAULT_CONSTRUCTOR: String

Reported when a POJO has multiple constructors, one of which is a no-arg constructor. Room will pick that one by default but will print this warning in case the constructor choice is important. You can always guide Room to use the right constructor using the @Ignore annotation.

Value: "ROOM_DEFAULT_CONSTRUCTOR"

INDEX_FROM_EMBEDDED_ENTITY_IS_DROPPED

static val INDEX_FROM_EMBEDDED_ENTITY_IS_DROPPED: String

Reported when an Entity that has a Embeddedd field whose type is another Entity and that Entity has some indices defined. These indices will NOT be created in the containing Entity. If you want to preserve them, you can re-define them in the containing Entity.

Value: "ROOM_EMBEDDED_ENTITY_INDEX_IS_DROPPED"

INDEX_FROM_EMBEDDED_FIELD_IS_DROPPED

static val INDEX_FROM_EMBEDDED_FIELD_IS_DROPPED: String

Reported when an Entity field that is annotated with Embedded has a sub field which has a ColumnInfo annotation with index = true.

You can re-define the index in the containing Entity.

Value: "ROOM_EMBEDDED_INDEX_IS_DROPPED"

INDEX_FROM_PARENT_FIELD_IS_DROPPED

static val INDEX_FROM_PARENT_FIELD_IS_DROPPED: String

Reported when an Entity inherits a field from its super class and the field has a ColumnInfo annotation with index = true.

These indices are dropped for the Entity and you would need to re-declare them if you want to keep them. Alternatively, you can set Entity#inheritSuperIndices() to true.

Value: "ROOM_PARENT_FIELD_INDEX_IS_DROPPED"

INDEX_FROM_PARENT_IS_DROPPED

static val INDEX_FROM_PARENT_IS_DROPPED: String

Reported when an Entity's parent declares an Index. Room does not automatically inherit these indices to avoid hidden costs or unexpected constraints.

If you want your child class to have the indices of the parent, you must re-declare them in the child class. Alternatively, you can set Entity#inheritSuperIndices() to true.

Value: "ROOM_PARENT_INDEX_IS_DROPPED"

MISSING_INDEX_ON_FOREIGN_KEY_CHILD

static val MISSING_INDEX_ON_FOREIGN_KEY_CHILD: String

When there is a foreign key from Entity A to Entity B, it is a good idea to index the reference columns in B, otherwise, each modification on Entity A will trigger a full table scan on Entity B.

If Room cannot find a proper index in the child entity (Entity B in this case), Room will print this warning.

Value: "ROOM_MISSING_FOREIGN_KEY_CHILD_INDEX"

MISSING_JAVA_TMP_DIR

static val MISSING_JAVA_TMP_DIR: String

Reported when Room cannot verify database queries during compilation due to lack of tmp dir access in JVM.

Value: "ROOM_MISSING_JAVA_TMP_DIR"

MISSING_SCHEMA_LOCATION

static val MISSING_SCHEMA_LOCATION: String

Reported when a `room.schemaLocation` argument is not provided into the annotation processor. You can either set Database#exportSchema() to false or provide `room.schemaLocation` to the annotation processor. You are strongly adviced to provide it and also commit them into your version control system.

Value: "ROOM_MISSING_SCHEMA_LOCATION"

PRIMARY_KEY_FROM_EMBEDDED_IS_DROPPED

static val PRIMARY_KEY_FROM_EMBEDDED_IS_DROPPED: String

Reported when an Entity field that is annotated with Embedded has a sub field which is annotated with PrimaryKey but the PrimaryKey is dropped while composing it into the parent object.

Value: "ROOM_EMBEDDED_PRIMARY_KEY_IS_DROPPED"

RELATION_QUERY_WITHOUT_TRANSACTION

static val RELATION_QUERY_WITHOUT_TRANSACTION: String

Reported when a @Query method returns a POJO that has relations but the method is not annotated with @Transaction. Relations are run as separate queries and if the query is not run inside a transaction, it might return inconsistent results from the database.

Value: "ROOM_RELATION_QUERY_WITHOUT_TRANSACTION"

RELATION_TYPE_MISMATCH

static val RELATION_TYPE_MISMATCH: String

Reported when a Relation Entity's SQLite column type does not match the type in the parent. Room will still do the matching using String representations.

Value: "ROOM_RELATION_TYPE_MISMATCH"

Public constructors

<init>

RoomWarnings()

Deprecated: This type should not be instantiated as it contains only static methods.