CBLDatabase

@interface CBLDatabase : NSObject

A Couchbase Lite database.

  • The database’s name.

    Declaration

    Objective-C

    @property (readonly, nonatomic) NSString *_Nonnull name;

  • The database’s path. If the database is closed or deleted, nil value will be returned.

    Declaration

    Objective-C

    @property (readonly, atomic, nullable) NSString *path;

  • The number of documents in the database.

    Declaration

    Objective-C

    @property (readonly, atomic) uint64_t count;

  • The database’s configuration. The returned configuration object is readonly; an NSInternalInconsistencyException exception will be thrown if the configuration object is modified.

    Declaration

    Objective-C

    @property (readonly, nonatomic) CBLDatabaseConfiguration *_Nonnull config;

Initializers

  • Initializes a database object with a given name and the default database configuration. If the database does not yet exist, it will be created.

    Declaration

    Objective-C

    - (nullable instancetype)initWithName:(nonnull NSString *)name
                                error:(NSError *_Nullable *_Nullable)error;

    Parameters

    name

    The name of the database.
    error

    On return, the error if any.

  • Initializes a Couchbase Lite database with a given name and database configuration. If the database does not yet exist, it will be created.

    Declaration

    Objective-C

    - (nullable instancetype)initWithName:(nonnull NSString *)name
                               config:
                                   (nullable CBLDatabaseConfiguration *)config
                                error:(NSError *_Nullable *_Nullable)error;

    Parameters

    name

    The name of the database.
    config

    The database configuration, or nil for the default configuration.
    error

    On return, the error if any.

  • Not available

    Declaration

    Objective-C

    - (nonnull instancetype)init;

Get Existing Document

  • Gets an existing CBLMutableDocument object with the given ID. If the document with the given ID doesn’t exist in the database, the value returned will be nil.

    Declaration

    Objective-C

    - (nullable CBLDocument *)documentWithID:(nonnull NSString *)id;

    Parameters

    id

    The document ID.

    Return Value

    The CBLMutableDocument object.

Subscript

  • Gets a document fragment with the given document ID.

    Declaration

    Objective-C

    - (nonnull CBLDocumentFragment *)objectForKeyedSubscript:
    (nonnull NSString *)documentID;

    Parameters

    documentID

    The document ID.

    Return Value

    The CBLDocumentFragment object.

Save, Delete, Purge

  • Saves the given document to the database. If the document in the database has been updated since it was read by the given document, a conflict occurs, which will be resolved by invoking the conflict handler. This can happen if multiple application threads are writing to the database, or a pull replication is copying changes from a server.

    Declaration

    Objective-C

    - (nullable CBLDocument *)saveDocument:(nonnull CBLMutableDocument *)document
                                 error:(NSError *_Nullable *_Nullable)error;

    Parameters

    document

    The document to be saved.
    error

    On return, the error if any.

    Return Value

    The saved CBLDocument object.

  • Deletes the given document. All properties are removed, and subsequent calls to -documentWithID: will return nil. Deletion adds a special tombstone revision to the database, as bookkeeping so that the change can be replicated to other databases. Thus, it does not free up all of the disk space occupied by the document. To delete a document entirely (but without the ability to replicate this), use -purge:error:.

    Declaration

    Objective-C

    - (BOOL)deleteDocument:(nonnull CBLDocument *)document
                 error:(NSError *_Nullable *_Nullable)error;

    Parameters

    document

    The document to be deleted.
    error

    On return, the error if any.

    Return Value

    True on success, false on failure.

  • Purges the given document from the database. This is more drastic than deletion: it removes all traces of the document. The purge will NOT be replicated to other databases.

    Declaration

    Objective-C

    - (BOOL)purgeDocument:(nonnull CBLDocument *)document
                error:(NSError *_Nullable *_Nullable)error;

    Parameters

    document

    The document to be purged.
    error

    On return, the error if any.

    Return Value

    True on success, false on failure.

Batch Operation

  • Runs a group of database operations in a batch. Use this when performing bulk write operations like multiple inserts/updates; it saves the overhead of multiple database commits, greatly improving performance.

    Declaration

    Objective-C

    - (BOOL)inBatch:(NSError *_Nullable *_Nullable)error
     usingBlock:(nonnull void (^)(void))block;

    Parameters

    error

    On return, the error if any.
    block

    The block to execute a group of database operations.

    Return Value

    True on success, false on failure.

Databaes Maintenance

  • Closes a database.

    Declaration

    Objective-C

    - (BOOL)close:(NSError *_Nullable *_Nullable)error;

    Parameters

    error

    On return, the error if any.

    Return Value

    True on success, false on failure.

  • Deletes a database.

    Declaration

    Objective-C

    - (BOOL) delete:(NSError *_Nullable *_Nullable)error;

    Parameters

    error

    On return, the error if any.

    Return Value

    True on success, false on failure.

  • Compacts the database file by deleting unused attachment files and vacuuming the SQLite database

    Declaration

    Objective-C

    - (BOOL)compact:(NSError *_Nullable *_Nullable)error;

    Parameters

    error

    On return, the error if any.

    Return Value

    True on success, false on failure.

  • Changes the database’s encryption key, or removes encryption if the new key is nil.

    Declaration

    Objective-C

    - (BOOL)setEncryptionKey:(nullable CBLEncryptionKey *)key
                   error:(NSError *_Nullable *_Nullable)error;

    Parameters

    key

    The encryption key.
    error

    On return, the error if any.

    Return Value

    True if the database was successfully re-keyed, or false on failure.

  • Deletes a database of the given name in the given directory.

    Declaration

    Objective-C

    + (BOOL)deleteDatabase:(nonnull NSString *)name
           inDirectory:(nullable NSString *)directory
                 error:(NSError *_Nullable *_Nullable)error;

    Parameters

    name

    The database name.
    directory

    The directory where the database is located at.
    error

    On return, the error if any.

    Return Value

    True on success, false on failure.

  • Checks whether a database of the given name exists in the given directory or not.

    Declaration

    Objective-C

    + (BOOL)databaseExists:(nonnull NSString *)name
           inDirectory:(nullable NSString *)directory;

    Parameters

    name

    The database name.
    directory

    The directory where the database is located at.

    Return Value

    True on success, false on failure.

  • Copies a canned databaes from the given path to a new database with the given name and the configuration. The new database will be created at the directory specified in the configuration. Without given the database configuration, the default configuration that is equivalent to setting all properties in the configuration to nil will be used.

    Declaration

    Objective-C

    + (BOOL)copyFromPath:(nonnull NSString *)path
          toDatabase:(nonnull NSString *)name
          withConfig:(nullable CBLDatabaseConfiguration *)config
               error:(NSError *_Nullable *_Nullable)error;

    Parameters

    path

    The source database path.
    name

    The name of the new database to be created.
    config

    The database configuration for the new database.
    error

    On return, the error if any.

    Return Value

    True on success, false on failure.

Logging

Change Listener

  • Adds a database change listener. Changes will be posted on the main queue.

    Declaration

    Objective-C

    - (nonnull id<CBLListenerToken>)addChangeListener:
    (nonnull void (^)(CBLDatabaseChange *_Nonnull))listener;

    Parameters

    listener

    The listener to post the changes.

    Return Value

    An opaque listener token object for removing the listener.

  • Adds a database change listener with the dispatch queue on which changes will be posted. If the dispatch queue is not specified, the changes will be posted on the main queue.

    Declaration

    Objective-C

    - (nonnull id<CBLListenerToken>)
addChangeListenerWithQueue:(nullable dispatch_queue_t)queue
                  listener:
                      (nonnull void (^)(CBLDatabaseChange *_Nonnull))listener;

    Parameters

    queue

    The dispatch queue.
    listener

    The listener to post changes.

    Return Value

    An opaque listener token object for removing the listener.

  • Adds a document change listener for the document with the given ID. Changes will be posted on the main queue.

    Declaration

    Objective-C

    - (nonnull id<CBLListenerToken>)
addDocumentChangeListenerWithID:(nonnull NSString *)id
                       listener:(nonnull void (^)(CBLDocumentChange *_Nonnull))
                                    listener;

    Parameters

    id

    The document ID.
    listener

    The listener to post changes.

    Return Value

    An opaque listener token object for removing the listener.

  • Adds a document change listener for the document with the given ID and the dispatch queue on which changes will be posted. If the dispatch queue is not specified, the changes will be posted on the main queue.

    Declaration

    Objective-C

    - (nonnull id<CBLListenerToken>)
addDocumentChangeListenerWithID:(nonnull NSString *)id
                          queue:(nullable dispatch_queue_t)queue
                       listener:(nonnull void (^)(CBLDocumentChange *_Nonnull))
                                    listener;

    Parameters

    id

    The document ID.
    queue

    The dispatch queue.
    listener

    The listener to post changes.

    Return Value

    An opaque listener token object for removing the listener.

  • Removes a change listener with the given listener token.

    Declaration

    Objective-C

    - (void)removeChangeListenerWithToken:(nonnull id<CBLListenerToken>)token;

    Parameters

    token

    The listener token.

Index

  • All index names.

    Declaration

    Objective-C

    @property (readonly, atomic) NSArray<NSString *> *_Nonnull indexes;

  • Creates an index which could be a value index or a full-text search index with the given name. The name can be used for deleting the index. Creating a new different index with an existing index name will replace the old index; creating the same index with the same name will be no-ops.

    Declaration

    Objective-C

    - (BOOL)createIndex:(nonnull CBLIndex *)index
           withName:(nonnull NSString *)name
              error:(NSError *_Nullable *_Nullable)error;

    Parameters

    index

    The index.
    name

    The index name.
    error

    error On return, the error if any.

    Return Value

    True on success, false on failure.

  • Deletes the index of the given index name.

    Declaration

    Objective-C

    - (BOOL)deleteIndexForName:(nonnull NSString *)name
                     error:(NSError *_Nullable *_Nullable)error;

    Parameters

    name

    The index name.
    error

    error On return, the error if any.

    Return Value

    True on success, false on failure.