Abstract: A database system as well as a method and an apparatus for querying a database are disclosed herein. In one embodiment, a system comprises a master database, at least one slave database, and a query processing unit. The master database has a data connection with the slave database, and the slave database has a data connection with the query processing unit. The query processing unit is configured to split a query request into query operation instructions having non-overlapping query ranges, send the split query operation instructions to the same or different slave databases to perform the query operations, and return the query results. The disclosed embodiments improve query efficiency.

Abstract: A database system as well as a method and an apparatus for querying a database are disclosed herein. In one embodiment, a system comprises a master database, at least one slave database, and a query processing unit. The master database has a data connection with the slave database, and the slave database has a data connection with the query processing unit. The query processing unit is configured to split a query request into query operation instructions having non-overlapping query ranges, send the split query operation instructions to the same or different slave databases to perform the query operations, and return the query results. The disclosed embodiments improve query efficiency.

Abstract: A method of separating read operations from write operations includes obtaining and storing a client ID after establishing a slave database connection with a slave database corresponding to a client, and receiving an operation request from the client. If the operation request is a write request, the method also includes establishing a master database connection with a master database by use of a public ID and a public passcode and sending the client ID to the master database, where upon receiving, the master database updates the public ID with the received client ID, and updates access permissions associated with the public ID with access permissions associated with the client ID. The method further includes sending the write request to the master database by use of the master database connection, where a write operation corresponding to the write request and to the access permissions associated with client ID is executed.

Abstract: An example method includes controlling an audio source to generate a test tone, controlling a plurality of audio sensors to sense the test tone simultaneously, receiving an output signal from each audio sensor, and determining an acoustic characteristic of each audio sensor based at least in part on the received output signals. The method also includes determining a difference between the acoustic characteristic and a corresponding reference value, identifying at least one audio sensor for which a difference corresponding to the at least one audio sensor is within a predetermined range of the reference value, and generating a compensation factor of the at least one audio sensor based at least in part on the respective output signal of the at least one audio sensor.

Abstract: A method of separating read operations from write operations includes obtaining and storing a client ID after establishing a slave database connection with a slave database corresponding to a client, and receiving an operation request from the client. If the operation request is a write request, the method also includes establishing a master database connection with a master database by use of a public ID and a public passcode and sending the client ID to the master database, where upon receiving, the master database updates the public ID with the received client ID, and updates access permissions associated with the public ID with access permissions associated with the client ID. The method further includes sending the write request to the master database by use of the master database connection, where a write operation corresponding to the write request and to the access permissions associated with client ID is executed.

Abstract: A battery locking device for a new energy vehicle including: a battery compartment fit for a battery, the battery compartment being provided with a battery inlet; and a battery clamping device provided on the battery compartment and controlled by a linkage mechanism. Since the battery clamping device is controlled by the linkage mechanism, during the mounting or removing of the battery, the battery can be integrally clamped or released by merely operating an operating end of the linkage mechanism. Compared with the prior art in which the battery is fixed through bolts, the battery can be integrally clamped or released by the battery locking device through a single operation, which greatly simplifies the disassembling or assembling process of the battery and reduces the time required for replacing the battery. A new energy vehicle provided with the above battery locking device has the same advantages.

Abstract: A battery locking device for a new energy vehicle including: a battery compartment fit for a battery, the battery compartment being provided with a battery inlet; and a battery clamping device provided on the battery compartment and controlled by a linkage mechanism. Since the battery clamping device is controlled by the linkage mechanism, during the mounting or removing of the battery, the battery can be integrally clamped or released by merely operating an operating end of the linkage mechanism. Compared with the prior art in which the battery is fixed through bolts, the battery can be integrally clamped or released by the battery locking device through a single operation, which greatly simplifies the disassembling or assembling process of the battery and reduces the time required for replacing the battery. A new energy vehicle provided with the above battery locking device has the same advantages.