# DataAbility Lifecycle


You can override lifecycle callbacks (described in the table below) for a DataAbility based on service requirements.  


**Table 1** DataAbility lifecycle APIs

| API| Description|
| -------- | -------- |
| onInitialized?(info: AbilityInfo): void | Called during ability initialization to initialize the relational database (RDB).|
| update?(uri: string, valueBucket: rdb.ValuesBucket, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<number>): void | Updates data in the database.|
| query?(uri: string, columns: Array<string>, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<ResultSet>): void | Queries data in the database.|
| delete?(uri: string, predicates: dataAbility.DataAbilityPredicates, callback: AsyncCallback<number>): void | Deletes one or more data records from the database.|
| normalizeUri?(uri: string, callback: AsyncCallback<string>): void | Normalizes the URI. A normalized URI applies to cross-device use, persistence, backup, and restore. When the context changes, it ensures that the same data item can be referenced.|
| batchInsert?(uri: string, valueBuckets: Array<rdb.ValuesBucket>, callback: AsyncCallback<number>): void | Inserts multiple data records into the database.|
| denormalizeUri?(uri: string, callback: AsyncCallback<string>): void | Converts a normalized URI generated by **normalizeUri** into a denormalized URI.|
| insert?(uri: string, valueBucket: rdb.ValuesBucket, callback: AsyncCallback<number>): void | Inserts a data record into the database.|
| openFile?(uri: string, mode: string, callback: AsyncCallback<number>): void | Opens a file.|
| getFileTypes?(uri: string, mimeTypeFilter: string, callback: AsyncCallback<Array<string>>): void | Obtains the MIME type of a file.|
| getType?(uri: string, callback: AsyncCallback<string>): void | Obtains the MIME type matching the data specified by the URI.|
| executeBatch?(ops: Array<DataAbilityOperation>, callback: AsyncCallback<Array<DataAbilityResult>>): void | Operates data in the database in batches.|
| call?(method: string, arg: string, extras: PacMap, callback: AsyncCallback<PacMap>): void | Calls a custom API.|