Data return method and device and medium

The invention relates to the field of data access, in particular to a data returning method and device and a medium, and is used for solving the problems that time and labor are wasted and maintenance is not easy when an external system returns data. The method comprises the steps of determining a corresponding first system identifier and a first request field in response to first data request information, determining a first storage field corresponding to the first request field based on a pre-configured corresponding relationship between the request field and the storage field, and determining a second storage field corresponding to the first request field based on a pre-configured corresponding relationship between the system identifier and a data configuration rule. Determining a target data configuration rule corresponding to the first system identifier, reading first target data from the first storage field, combining the first target data according to the target data configuration rule to obtain first