Abstract: A method and apparatus for file storage is disclosed, wherein the method comprises: recording meta-data information of a folder, and storing the meta-data information into key-value databases; and, when the folder includes at least one sub-folder list and/or file list thereunder, storing the contents of the at least one sub-folder list and/or file list included under the folder in secondary keys based on the primary key. The method achieves “open ended” unlimited expansion of data in a directory tree storage. The use of the “open ended” unlimited data expansion scheme avoids bottlenecks related to underlying data storage when accumulated data become large. In comparison with the prior art method, the method splits and stores large data into multiple secondary keys for uniform data distribution, thereby enhances storage stability of storage databases and facilitates data expansion and systems' transaction operations.

Abstract: A contact management method, apparatus and system for a third-party application are described. The contact management method includes: detecting an instruction to obtain a contact, wherein the instruction is input by a user operating the third-patty application; reading contact data in an address book in responsive to the instruction to obtain the contact; encrypting the contact data and obtaining an encrypted contact data; importing the encrypted contact data into a contact data table of the third-party application; and uploading the encrypted contact data in the contact data table to a cloud server, so that a mapping relationship between account information of the user and the encrypted contact data is established at the cloud server, wherein the account information of the user is used for logging in the third-party application. In the method, the apparatus and the system, safety and reliability of the contact data can be improved.

Abstract: A method and apparatus for file storage is disclosed, wherein the method comprises: recording meta-data information of a folder, and storing the meta-data information into key-value databases; and, when the folder includes at least one sub-folder list and/or file list thereunder, storing the contents of the at least one sub-folder list and/or file list included under the folder in secondary keys based on the primary key. The method achieves “open ended” unlimited expansion of data in a directory tree storage. The use of the “open ended” unlimited data expansion scheme avoids bottlenecks related to underlying data storage when accumulated data become large. In comparison with the prior art method, the method splits and stores large data into multiple secondary keys for uniform data distribution, thereby enhances storage stability of storage databases and facilitates data expansion and systems' transaction operations.