Ferreteria/archive/v0.5/sql/node leaf
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About
- Purpose: Values for nodes
Concept
Every leaf:
- has
- a name (unique within the node)
- a value
- is like a single field in a single record
Fields
History
- 2017-08-03 Started, because the need became apparent.
- 2020-01-16 redesigning for v0.4 (copied from Ferreteria/sql/tf leaf) - this became 0.41
- 2020-01-23 tweaking for v0.42
- 2021-01-19
- "integer width is deprecated"; also decided it should be 8 bytes
- Turns out LONGTEXT barfs at certain kinds of binary data, so changing to LONGBLOB.
- 2022-03-06 copying v0.42/sql/node_leaf verbatim for v0.5
- "Type" is in the documentation but not the table design. I'm thinking that it should be defined by the code, which will determine the data format based on registered field names. When we want to implement searching, there can be a separate table for indexing individual field-types.
SQL
CREATE TABLE `node_leaf` (
`ID` BIGINT NOT NULL AUTO_INCREMENT,
`ID_Node` BIGINT NOT NULL COMMENT "ID of node to which this value belongs",
`Name` VARCHAR(255) NOT NULL COMMENT "field name of this value",
`Value` LONGBLOB DEFAULT NULL COMMENT "value",
PRIMARY KEY(`ID`),
UNIQUE KEY(`ID_Node`,`Name`)
) ENGINE=InnoDB;