Blockchain-based data storage and query method and device

1. A computer-implemented method, comprising:

receiving, by a blockchain node, a service request, the service request comprising one or more data types and respective service data corresponding to the one or more data types that are stored in a blockchain;

determining a service type and identification information corresponding to the service request;

parsing the service request to obtain each data type of the service request and service data corresponding to each data type;

determining that no relational database has been created to correspond to the service type;

in response to determining that no relational database has been created to correspond to the service type, creating a relational database to correspond to the service type; and

storing, based on a mapping relationship between a data type and service data, the service data that is obtained through parsing in the relational database corresponding to the blockchain node.

2. The computer-implemented method of claim 1 , wherein parsing the service request to obtain each data type of the service request and service data corresponding to each data type comprises parsing the service request according to a data storage format specified by a smart contract of the blockchain.

3. The computer-implemented method of claim 2 , further comprising:

processing the smart contract to determine the service type and the one or more data types defined by the smart contract; and

creating, in the relational database, a database table corresponding to the service type having one or more columns corresponding respectively to the one or more data types defined in the smart contract.

4. The computer-implemented method of claim 2 , further comprising:

processing the smart contract to determine identification information corresponding to the service request; and

creating, in the relational database, a database table corresponding to the identification information corresponding to the service request.

5. The computer-implemented method of claim 1 , further comprising:

receiving a request for information about service data having a data type stored in the blockchain;

querying the relational database to obtain service data matching the data type; and

providing the service data matching the data type in response to the request.

6. The computer-implemented method of claim 5 , wherein the request for information about service data is a request to execute a smart contract on a consensus network.

7. The computer-implemented method of claim 1 , further comprising:

converting, based on a predetermined data format, each data type that comprised in the service request and the service data corresponding to each data type, to obtain a data sequence;

performing consensus procedure on the service request by using a consensus network; and

storing the data sequence in the blockchain corresponding to the blockchain node after a consensus is achieved on the service request.

8. The computer-implemented method of claim 1 , further comprising converting, based on a predetermined statement format, at least one of each data type, the service data corresponding to each data type, the service type, or the identification information obtained through parsing, to obtain a data storage statement for the relational database, and

wherein storing the service data in the relational database comprises executing the data storage statement.

9. The computer-implemented method of claim 8 , wherein the predetermined statement format comprises an identification information field and a service type field.

10. The computer-implemented method of claim 1 , wherein the service request comprises a service data query request.

11. The computer-implemented method of claim 1 , wherein the identification information comprises a user public key or a user identity.

12. A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

receiving, by a blockchain node, a service request, the service request comprising one or more data types and respective service data corresponding to the one or more data types that are stored in a blockchain;

determining a service type and identification information corresponding to the service request;

parsing the service request to obtain each data type of the service request and service data corresponding to each data type;

determining that no relational database has been created to correspond to the service type;

in response to determining that no relational database has been created to correspond to the service type, creating a relational database to correspond to the service type; and

storing, based on a mapping relationship between a data type and service data, the service data that is obtained through parsing in the relational database corresponding to the blockchain node.

13. A computer-implemented system, comprising:

one or more computers; and

one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform one or more operations comprising:

receiving, by a blockchain node, a service request, the service request comprising one or more data types and respective service data corresponding to the one or more data types that are stored in a blockchain;

determining a service type and identification information corresponding to the service request;

parsing the service request to obtain each data type of the service request and service data corresponding to each data type;

determining that no relational database has been created to correspond to the service type;

in response to determining that no relational database has been created to correspond to the service type, creating a relational database to correspond to the service type; and

storing, based on a mapping relationship between a data type and service data, the service data that is obtained through parsing in the relational database corresponding to the blockchain node.

14. The computer-implemented system of claim 13 , wherein parsing the service request to obtain each data type of the service request and service data corresponding to each data type comprises parsing the service request according to a data storage format specified by a smart contract of the blockchain.

15. The computer-implemented system of claim 14 , further comprising:

processing the smart contract to determine the service type and the one or more data types defined by the smart contract; and

creating, in the relational database, a database table corresponding to the service type having one or more columns corresponding respectively to the one or more data types defined in the smart contract.

16. The computer-implemented system of claim 14 , further comprising:

processing the smart contract to determine identification information corresponding to the service request; and

creating, in the relational database, a database table corresponding to the identification information corresponding to the service request.

17. The computer-implemented system of claim 13 , further comprising:

receiving a request for information about service data having a data type stored in the blockchain;

querying the relational database to obtain service data matching the data type; and

providing the service data matching the data type in response to the request.

18. The computer-implemented system of claim 17 , wherein the request for information about service data is a request to execute a smart contract on a consensus network.