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Tencent Technology (shenzhen) Company Limited

Zhi Hao Shang

Hong Fei Zhou

A block chain-based data query method, performed by a server of a block chain system, is provided. In the method, a data identifier of first data to be queried is obtained according to a query request, the query request including a user identifier of a user that initiates the query request. Data permission information in a target block in a target block chain of the block chain system is obtained according to the data identifier. Based on the data permission information not including the user identifier, a query permission request is transmitted to at least one target server in the block chain system, the query permission request including the user identifier and the data identifier. Based on a received query permission response satisfying a target policy in the data permission information, the first data is obtained from a data storage system according to the data identifier.

Block chain-based data query method, server and storage medium

An educational ruler is a protractor, where the protractor can draw and measure angles. The educational ruler includes a planar disk having a semicircular circumference and labeled in scales along the semicircular circumference; a straight line edge connecting two edges of the semicircular circumference; a through hole on the planar disk; a first edge and a second edge extending from the through hole to the straight line edge; a third edge and a fourth edge extending from the semicircular circumference to the straight line edge. The first edge of the through hole of the educational ruler and the second edge of the through hole of the educational ruler intersect at 90 degrees scale of the planar disk to form the first right angle, and the included angle of the first edge of the through hole of the educational ruler and the straight line edge of the educational ruler is 45 degrees.

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Shenzhen, China

Zhi Hao Shang