Created
January 16, 2011 19:46
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Versioned Database
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-- Base class for all versioned models | |
CREATE TABLE `VersionedModel` ( | |
`BlobId` INTEGER(11) NOT NULL, | |
`VersionId` BINARY(64) NOT NULL, | |
`IsTip` BOOLEAN NOT NULL, | |
PRIMARY KEY (`BlobId`,`VersionId`), | |
KEY `model_tip_index` (`BlobId`,`IsTip`) | |
) ENGINE=InnoDB; | |
-- Tracks changes to models | |
CREATE TABLE `History` | |
( | |
`ModelBlobId` INTEGER(11) NOT NULL, | |
`ModelVersionId` BINARY(64) NOT NULL, | |
`ModelParentId` BINARY(64), | |
`ModelType` VARCHAR(10) NOT NULL, | |
`Action` INTEGER(11) NOT NULL, | |
`Timestamp` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, | |
`User` VARCHAR(50) NOT NULL, | |
`Signature` BINARY(100) NOT NULL, | |
PRIMARY KEY (`ModelBlobId`,`ModelVersionId`,`ModelParentId`), | |
CONSTRAINT `history_parent_constraint` FOREIGN KEY (`ModelBlobId`, `ModelParentId`) REFERENCES `VersionedModel` (`BlobId`, `VersionId`), | |
CONSTRAINT `history_version_constraint` FOREIGN KEY (`ModelBlobId`, `ModelVersionId`) REFERENCES `VersionedModel` (`BlobId`, `VersionId`) | |
) ENGINE=InnoDB; | |
-- An example of a versioned model | |
CREATE TABLE `Comment` | |
( | |
`CommentId` INTEGER(11) NOT NULL, | |
`CommentVersionId` BINARY(64) NOT NULL, | |
`User` VARCHAR(50) NOT NULL, | |
`Body` TEXT NOT NULL, | |
PRIMARY KEY (`CommentId`,`CommentVersionId`), | |
CONSTRAINT `comment_fk_constraint` FOREIGN KEY (`CommentId`, `CommentVersionId`) REFERENCES `VersionedModel` (`BlobId`, `VersionId`) | |
) ENGINE=InnoDB; |
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