InstaGov/schema/answer

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>