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This invention belongs to the field of ultra-deep and ultra-high pressure downhole sampling technology, and relates to an ultra-deep and ultra-high pressure downhole PVT sampling device. This invention uses an electronic switch to time the activation of a one-way switch. The one-way switch ensures that fluid can only flow into the sampling chamber through the sampling inlet in one direction, preventing backflow or leakage after sampling, thus ensuring the accuracy and safety of the sampling. During sampling, the piston assembly moves towards the trigger switch under the action of the sample. When the trigger part on the piston assembly squeezes the trigger switch, and the pressure value of the squeezed trigger switch reaches a threshold, the trigger switch opens, and pressure-holding gas is injected into the sampling chamber through the pressure-holding gas inlet to maintain the high pressure state of the fluid sample in the sampling chamber. This achieves precise control of the pressure-holding gas injection, ensuring the accuracy and representativeness of the sample. This invention can achieve deep downhole pressure-holding sampling with good representativeness of the sampling results.

This disclosure relates to a database operation method and system in a storage device. The method may include: parsing a database operation instruction sent by a host device to obtain a first text and a second text; obtaining a target database identifier and control parameter information based on the first text; determining the target database indicated by the target database identifier; determining at least one target statement for the target database and target statement parameters corresponding to each target statement based on the second text; executing each target statement according to the target statement parameters and obtaining a database operation result; determining target result data based on the control parameter information and the database operation result, and sending the target result data to the host device. According to the technical solution provided by this disclosure, a unified interaction process for database statements and result data can be formed between the host device and the storage device, thereby potentially reducing the complexity of interaction and adaptation.