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architecture [2011/11/15 22:07] jap |
architecture [2011/11/21 10:29] jap |
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| {{:db_structure.png|}}\\ | {{:db_structure.png|}}\\ | ||
| //Database structure// | //Database structure// | ||
| + | <del> | ||
| ''MemDB'' is the primary data exchange database. It contains two tables: ''Variable'' and ''Value''. Each physical parameter, like sensor reading, actuator target value, etc. has one row in ''Variable'' table defining properties of the variable. Each variable may have several values, separated with timestamp. Current value is the one with latest timestamp. | ''MemDB'' is the primary data exchange database. It contains two tables: ''Variable'' and ''Value''. Each physical parameter, like sensor reading, actuator target value, etc. has one row in ''Variable'' table defining properties of the variable. Each variable may have several values, separated with timestamp. Current value is the one with latest timestamp. | ||
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| Example:\\ | Example:\\ | ||
| - | Sensor //Outdoor Air Temperature// of ventilation unit may simultaneously belong to both ventilation measurements group and outdoor weather measurements group. | + | Sensor //Outdoor Air Temperature// of ventilation unit may simultaneously belong to both ventilation measurements group and outdoor weather measurements group.</del> |
| === Initialization === | === Initialization === | ||