InstaGov/schema/answer
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About
- Purpose: implements answers
- Rules: Any question may have zero or more answers. New answers can be added at any time.
- Notes:
- This table originally had a "WhenExpires" field; it was removed for the same reasons given in notes for the "question" table.
History
- 2013-01-07
- Added "Summary" field, which I had removed earlier when I was still thinking of letting this be heavily dependent on MW, and who/when fields.
- Added UNIQUE KEY "content" to prevent duplicate answers for the same question.
- 2013-07-21 Revising to use PostFerret; many redundant fields removed. Also removed Pos_Text and Neg_Text fields for now.
- The *_Text fields were intended as optional overrides to the values in question, but the latter has not yet been implemented; I think I may have decided at some point that it wasn't necessary.
SQL
<mysql>CREATE TABLE `answer` (
`ID_Post` INT NOT NULL COMMENT "post.ID for content", `ID_Question` INT NOT NULL COMMENT "question.ID (actually atom.ID) for which this is an answer", PRIMARY KEY(`ID_Post`) ) ENGINE = MYISAM;</mysql>
Obsolete
<mysql>CREATE TABLE `answer` (
`ID` INT NOT NULL AUTO_INCREMENT, `ID_Question` INT NOT NULL COMMENT "question.ID for which this is an answer", `Summary` VARCHAR(255) NOT NULL COMMENT "short description of answer", `Page` VARCHAR(127) COMMENT "URI of optional site page giving more details", `Pos_Text` VARCHAR(63) DEFAULT NULL COMMENT "optional: text to show at the 'yes' end of the scale (overrides question default)", `Neg_Text` VARCHAR(63) DEFAULT NULL COMMENT "optional: text to show at the 'no' end of the scale (overrides question default)", `WhenCreated` DATETIME NOT NULL COMMENT "when this records was entered", `WhoCreated` INT NOT NULL COMMENT "ID of user who added the record", `WhenEdited` DATETIME DEFAULT NULL COMMENT "when this question was last edited", `WhoEdited` INT DEFAULT NULL COMMENT "ID of user who last edited the record", `QtyEdits` INT DEFAULT NULL COMMENT "number of times this record has been edited", PRIMARY KEY(`ID`), UNIQUE KEY `content` (`ID_Question`,`Summary`) ) ENGINE = MYISAM;</mysql>
For migrating data from old schema to new (some fields omitted): <mysql>INSERT INTO atom (Class,WhenCreated,WhoCreated,WhenEdited,QtyEdits) SELECT "an",WhenCreated,WhoCreated,WhenEdited,QtyEdits FROM OLD_answer;
INSERT INTO post (ID_Atom,ID_Owner,Summary,Body) SELECT atom.ID,NULL,Summary,Body FROM OLD_answer AS a LEFT JOIN atom ON a.WhenCreated=atom.WhenCreated;
INSERT INTO answer (ID_Post,ID_Question) SELECT ID_Atom,ID_Question FROM OLD_answer AS a LEFT JOIN post ON a.Summary=post.Summary; </mysql>