Abstract: Method for providing data access service to a database comprises executing a service specification using a service engine, wherein the service specification is independent of programming languages and is composed declaratively using SQL and JSON, preferably. Examples are provided for common data access service types, including query service, SQL service, PROC service and CRUD service for relational database. Method is disclosed for designing service specifications for less common type of databases and data access patterns. A service engine can be implemented for executing a particular type of data access service. A collection of service engines and of service specifications can be built and hosted on a server for providing full data access services to client application.

Abstract: The present invention providing a system and installation method of wireless vehicle detection based on earth magnetic induction a signal collection module, a signal conditioning module, a MCU control module, a wireless communication module, a battery module and a signal receiver module includes.

Abstract: An information exchange device contains the outside framework, the front panel and the back panel, a vacant space is formed inside of the outside framework. In the vacant space, a control circuit is disposed which includes a micro-control unit with the control procedure inside, a batter unit connected with the micro-control unit, a keyboard unit connected with the input of the micro-control unit, a RF unit having a two-way communication links with the micro-control unit, an antenna unit connected with the RF unit and used for receiving and sending at the working frequency of 2.45 GHz, a LCD display unit connected with the output of the micro-control unit, a near-distance RFID with a working frequency of 13.56 MHz. The information exchange device of the present invention adopts the 2.45 GHz as the working frequency and having a near-distance RFID disposed inside, as a result that the information exchange of long-distance, low-power, anti-collision achieves and the short distance RF communication achieves.

Abstract: The present invention providing a system and installation method of wireless vehicle detection based on earth magnetic induction a signal collection module, a signal conditioning module, a MCU control module, a wireless communication module, a battery module and a signal receiver module includes.

Abstract: The present invention provides an information exchange device contains the outside framework, the front panel and the back panel, a vacant space is formed inside of the outside framework. In the vacant space, a control circle is disposed which includes a micro-control unit with the control procedure inside, a batter unit connected with the micro-control unit, a keyboard unit connected with the input of the micro-control unit, a RF unit having a two-way communication links with the Micro-control unit, an antenna unit connected with the RF unit and used for receiving and sending at the working frequency of 2.45 GHz, a LCD display unit 70 connected with the output of the micro-control unit, a near-distance RFID with a working frequency of 13.56 MHz. The information exchange device of the present invention adopts the 2.