VbzCart/tables/cache flow
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About
- Purpose: Keeps track of data dependencies between tables – which queries update cached data in which tables from which sources
- Used by :
- REDIRECT Template:l/vc/query
- Refers to: cache_tables, cache_queries
- Fields:
- doWrite: TRUE = ID_Table is written to (i.e. TARGET table); otherwise it is only read from (SOURCE).
- Notes:
- If it turns out that some tables are both read and written, then we might want a doRead field as well.
- History:
- 2010-11-09 Renamed data_flow -> cache_flow; ID_Proc -> ID_Query
- 2010-11-13 Significant revision: ID_Srce/ID_Dest replaced by ID_Table/doWrite
SQL
<mysql>CREATE TABLE `cache_flow` (
ID_Proc INT NOT NULL COMMENT "cache_queries.ID of stored procedure which calculates Dest data from Srce data", ID_Table INT NOT NULL COMMENT "cache_tables.ID of a table", doWrite BOOL COMMENT "TRUE = writes to this table", Notes VARCHAR(255) COMMENT "loose explanatory or descriptive notes", PRIMARY KEY (`ID_Query`,`ID_Table`) ) ENGINE = MYISAM;</mysql>
previous version
<mysql>CREATE TABLE `cache_flow` (
ID_Srce INT NOT NULL COMMENT "cache_tables.ID of SOURCE table", ID_Dest INT NOT NULL COMMENT "cache_tables.ID of DESTINATION table", ID_Query INT NOT NULL COMMENT "cache_queries.ID of stored procedure which calculates Dest data from Srce data", Notes VARCHAR(255) COMMENT "loose explanatory or descriptive notes", PRIMARY KEY (`ID_Srce`,`ID_Dest`,`ID_Query`) ) ENGINE = MYISAM;</mysql>