RoomDatabase.Callback

Added in 2.0.0

Kotlin |Java

Cmn
```
abstract class RoomDatabase.Callback
```

Callback for RoomDatabase

Summary

Public constructors
`Callback()`	android
`Callback()`	Cmn
`Callback()`	N

Public functions
`open Unit`	`onCreate(connection: SQLiteConnection)` Called when the database is created for the first time.	Cmn android N
`open Unit`	`onCreate(db: SupportSQLiteDatabase)` Called when the database is created for the first time.	android
`open Unit`	`onDestructiveMigration(connection: SQLiteConnection)` Called after the database was destructively migrated.	Cmn android N
`open Unit`	`onDestructiveMigration(db: SupportSQLiteDatabase)` Called after the database was destructively migrated	android
`open Unit`	`onOpen(connection: SQLiteConnection)` Called when the database has been opened.	Cmn android N
`open Unit`	`onOpen(db: SupportSQLiteDatabase)` Called when the database has been opened.	android

Public constructors

Callback

android

Added in 2.0.0

Callback()

Callback

Cmn

Added in 2.0.0

Callback()

Callback

Added in 2.0.0

Callback()

Public functions

onCreate

Cmn android N

Added in 2.7.0

open fun onCreate(connection: SQLiteConnection): Unit

Called when the database is created for the first time.

This function called after all the tables are created.

Parameters
`connection: SQLiteConnection`	The database connection.

onCreate

android

Added in 2.0.0

open fun onCreate(db: SupportSQLiteDatabase): Unit

Called when the database is created for the first time. This is called after all the tables are created.

This function is only called when Room is configured without a driver. If a driver is set using Builder.setDriver, then only the version that receives a SQLiteConnection is called.

Parameters
`db: SupportSQLiteDatabase`	The database.

onDestructiveMigration

Cmn android N

Added in 2.7.0

open fun onDestructiveMigration(connection: SQLiteConnection): Unit

Called after the database was destructively migrated.

Parameters
`connection: SQLiteConnection`	The database connection.

onDestructiveMigration

android

Added in 2.2.0

open fun onDestructiveMigration(db: SupportSQLiteDatabase): Unit

Called after the database was destructively migrated

This function is only called when Room is configured without a driver. If a driver is set using Builder.setDriver, then only the version that receives a SQLiteConnection is called.

Parameters
`db: SupportSQLiteDatabase`	The database.

onOpen

Cmn android N

Added in 2.7.0

open fun onOpen(connection: SQLiteConnection): Unit

Called when the database has been opened.

Parameters
`connection: SQLiteConnection`	The database connection.

onOpen

android

Added in 2.0.0

open fun onOpen(db: SupportSQLiteDatabase): Unit

Called when the database has been opened.

This function is only called when Room is configured without a driver. If a driver is set using Builder.setDriver, then only the version that receives a SQLiteConnection is called.

Parameters
`db: SupportSQLiteDatabase`	The database.