Abstract: A computer-implemented method, medium, and system are disclosed. In one computer-implemented method, an invocation request sent by an initiator is received by a blockchain node in a blockchain network. The invocation request is associated with invocation of a smart contract in the blockchain network. The smart contract includes contract code, data, and pre-update metadata. A pre-update data structure described by the pre-update metadata is parsed by the blockchain node and by execution of the contract code. The pre-update data structure is associated with the data comprised in the smart contract. Following parsing of the pre-update data structure, the pre-update data structure is represented by the blockchain node using a computer programming language. The pre-update data structure specified by the computer programming language is sent by the blockchain node to the initiator.

Abstract: A computer-implemented method includes: obtaining, by a blockchain node, an invoking request for a first smart contract based on receiving a data structure update transaction, where the transaction comprises an input parameter indicating an updated data structure. The updated data structure that is based on a computer programming language is obtained. The first smart contract is run, comprising: parsing the updated data structure and converting the updated data structure characterized by the computer programming language into updated metadata characterized by a definition description language. A second smart contract comprising pre-update metadata and data is invoked using the updated metadata as input parameters. The second smart contract is run, comprising: replacing the pre-update metadata with the updated metadata, parsing the updated metadata in the second smart contract, and updating a pre-update data structure of the data in the second smart contract based on a parsing result.

Abstract: One or more embodiments of the present specification provide data retrieving and recording methods and apparatuses, and electronic devices. One method comprises: identifying, by a blockchain node in a blockchain network, a data retrieving and recording request for a smart contract, wherein the data retrieving and recording request is configured to trigger a data retrieving and recording operation on a target object in a data set comprised in the smart contract; and parsing, by the blockchain node and to generate a parsing result, metadata comprised in the smart contract, wherein the parsing performs instructions comprised in the smart contract, and wherein the parsing result indicates a storage field corresponding to the target object in the data set for implementing the data retrieving and recording operation on the storage field.

Abstract: A computer-implemented method, medium, and system are disclosed. In one computer-implemented method, an invocation request sent by an initiator is received by a blockchain node in a blockchain network. The invocation request is associated with invocation of a smart contract in the blockchain network. The smart contract includes contract code, data, and pre-update metadata. A pre-update data structure described by the pre-update metadata is parsed by the blockchain node and by execution of the contract code. The pre-update data structure is associated with the data comprised in the smart contract. Following parsing of the pre-update data structure, the pre-update data structure is represented by the blockchain node using a computer programming language. The pre-update data structure specified by the computer programming language is sent by the blockchain node to the initiator.

Abstract: One or more embodiments of the present specification provide data retrieving and recording methods and apparatuses, and electronic devices. One method comprises: identifying, by a blockchain node in a blockchain network, a data retrieving and recording request for a smart contract, wherein the data retrieving and recording request is configured to trigger a data retrieving and recording operation on a target object in a data set comprised in the smart contract; and parsing, by the blockchain node and to generate a parsing result, metadata comprised in the smart contract, wherein the parsing performs instructions comprised in the smart contract, and wherein the parsing result indicates a storage field corresponding to the target object in the data set for implementing the data retrieving and recording operation on the storage field.

Abstract: One or more embodiments of the present specification provide field update methods and apparatuses, and devices. A computer-implemented method can include the following: obtaining, by a blockchain node in a blockchain network, a field update request for a smart contract, where the field update request is used to implement a field update on data in a data set included in the smart contract; adjusting, by the blockchain node based on the field update request and as adjusted metadata, metadata included in the smart contract; and parsing, using code in the smart contract, the adjusted metadata to update a field associated with the field update request.

Abstract: A computer-implemented method includes: obtaining, by a blockchain node, an invoking request for a first smart contract based on receiving a data structure update transaction, where the transaction comprises an input parameter indicating an updated data structure. The updated data structure that is based on a computer programming language is obtained. The first smart contract is run, comprising: parsing the updated data structure and converting the updated data structure characterized by the computer programming language into updated metadata characterized by a definition description language. A second smart contract comprising pre-update metadata and data is invoked using the updated metadata as input parameters. The second smart contract is run, comprising: replacing the pre-update metadata with the updated metadata, parsing the updated metadata in the second smart contract, and updating a pre-update data structure of the data in the second smart contract based on a parsing result.