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<?php
namespace Micropoly;
use SQLite3;
class Schema
{
private SQLite3 $db;
/**
* @param SQLite3 $db
*/
public function __construct(SQLite3 $db) { $this->db = $db; }
private function getSchemaVersion(): int
{
$n = $this->db->querySingle("SELECT name FROM sqlite_master WHERE type = 'table' AND name = 'schema_meta'");
if ($n !== "schema_meta")
return 0;
return (int)$this->db->querySingle("SELECT value FROM schema_meta WHERE key = 'version'");
}
private function setSchemaVersion(int $v): void
{
(new DbQuery("REPLACE INTO schema_meta (key, value) VALUES ('version', :v)"))
->bind(":v", $v)
->exec($this->db);
}
public function migrate()
{
$version = $this->getSchemaVersion();
switch ($version) {
case 0:
$this->v1();
$this->setSchemaVersion(1);
}
}
private function v1()
{
$this->db->exec("
CREATE TABLE schema_meta (
key VARCHAR(100) NOT NULL PRIMARY KEY,
value
) WITHOUT ROWID
");
$this->db->exec("
CREATE VIRTUAL TABLE note_contents USING fts4 (content TEXT)
");
$this->db->exec("
CREATE TABLE notes (
id VARCHAR(23) NOT NULL PRIMARY KEY,
content_row INT NOT NULL,
created_at BIGINT NOT NULL DEFAULT CURRENT_TIMESTAMP,
changed_at BIGINT NOT NULL DEFAULT CURRENT_TIMESTAMP,
trash INT NOT NULL DEFAULT 0
) WITHOUT ROWID
");
$this->db->exec("
CREATE TABLE tags (
note_id VARCHAR(23) NOT NULL REFERENCES notes (id) ON UPDATE CASCADE ON DELETE CASCADE,
tag TEXT NOT NULL,
PRIMARY KEY (note_id, tag)
) WITHOUT ROWID
");
$this->db->exec("CREATE INDEX tag ON tags (tag)");
$this->db->exec("
CREATE VIEW tagcloud AS
SELECT
tag,
COUNT(*) AS num
FROM tags
GROUP BY tag
");
}
}
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