GBase 8a之视频数据存取demo

概述在GBase8a数据库(gbase database)中视频文件如何导入以及如何读取视频文件并播放。实现步骤1建表CREATE TABLE vtest ( v_name varchar(50) DEFAULT NULL, v_data longblob ) ; 注意 longblob类型目前最大支持64MB的存储空间2视频文件数据导入数据库gbase INSERT INTO vtest (v_name, v_data) VALUES (1.mp4, LOAD_FILE(/home/gbase/1.mp4) ); Query OK, 1 row affected (Elapsed: 00:00:00.21)3从数据库中读取视频文件并播放def read_video_from_mysql(host, user, password, db, table, video_name, port): try: conn pymysql.connect( hosthost, useruser, password******, databasedb, portport, charsetutf8mb4 ) cursor conn.cursor() sql fSELECT v_data FROM {table} WHERE v_name %s cursor.execute(sql, (video_name,)) result cursor.fetchone() if not result or not result[0]: print(未找到对应的视频数据) return video_blob result[0] with tempfile.NamedTemporaryFile(suffix.mp4, deleteFalse) as temp_file: temp_file.write(video_blob) temp_file_path temp_file.name cap cv2.VideoCapture(temp_file_path) if not cap.isOpened(): print(无法打开视频文件) os.unlink(temp_file_path) return while cap.isOpened(): ret, frame cap.read() if ret: cv2.imshow(Video from GBASE, frame) if cv2.waitKey(25) 0xFF ord(q): break else: break cap.release() cv2.destroyAllWindows() os.unlink(temp_file_path) except pymysql.MySQLError as e: print(f数据库操作错误{e}) except Exception as e: print(f程序执行错误{e}) finally: if cursor in locals(): cursor.close() if conn in locals(): conn.close() if __name__ __main__: read_video_from_mysql( host192.168.56.101, usergbase, password******, dbvc_a.test, tablevtest, video_name1.mp4, port5258 )4验证执行播放效果视频信息可以正常播放