root
98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
package main
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import (
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"database/sql"
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"fmt"
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"strings"
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_ "github.com/go-sql-driver/mysql"
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_ "modernc.org/sqlite"
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)
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const sqliteSchema = `
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CREATE TABLE IF NOT EXISTS lists (
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id TEXT PRIMARY KEY,
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
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);
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CREATE TABLE IF NOT EXISTS sublists (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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list_id TEXT NOT NULL REFERENCES lists(id),
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name TEXT NOT NULL,
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color TEXT NOT NULL,
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
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);
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CREATE TABLE IF NOT EXISTS items (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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list_id TEXT NOT NULL REFERENCES lists(id),
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name TEXT NOT NULL,
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quantity INTEGER NOT NULL DEFAULT 1,
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done INTEGER NOT NULL DEFAULT 0,
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position REAL NOT NULL DEFAULT 0,
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sublist_id INTEGER REFERENCES sublists(id),
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
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);`
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const mysqlSchema = `
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CREATE TABLE IF NOT EXISTS lists (
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id VARCHAR(64) PRIMARY KEY,
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
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);
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CREATE TABLE IF NOT EXISTS sublists (
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id INTEGER PRIMARY KEY AUTO_INCREMENT,
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list_id VARCHAR(64) NOT NULL,
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name VARCHAR(255) NOT NULL,
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color VARCHAR(32) NOT NULL,
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
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FOREIGN KEY (list_id) REFERENCES lists(id)
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);
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CREATE TABLE IF NOT EXISTS items (
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id INTEGER PRIMARY KEY AUTO_INCREMENT,
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list_id VARCHAR(64) NOT NULL,
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name VARCHAR(255) NOT NULL,
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quantity INTEGER NOT NULL DEFAULT 1,
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done BOOLEAN NOT NULL DEFAULT FALSE,
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position DOUBLE NOT NULL DEFAULT 0,
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sublist_id INTEGER,
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created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
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FOREIGN KEY (list_id) REFERENCES lists(id),
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FOREIGN KEY (sublist_id) REFERENCES sublists(id)
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);`
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func openDB(databaseURL string) (*sql.DB, error) {
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driver, dsn, found := strings.Cut(databaseURL, "://")
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if !found {
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return nil, fmt.Errorf("DATABASE_URL must be in the form driver://dsn, got %q", databaseURL)
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}
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var schema string
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switch driver {
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case "sqlite":
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schema = sqliteSchema
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case "mysql":
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driver = "mysql"
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schema = mysqlSchema
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default:
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return nil, fmt.Errorf("unsupported database driver %q, expected sqlite or mysql", driver)
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}
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db, err := sql.Open(driver, dsn)
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if err != nil {
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return nil, fmt.Errorf("opening database: %w", err)
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}
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if err := db.Ping(); err != nil {
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return nil, fmt.Errorf("connecting to database: %w", err)
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}
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if _, err := db.Exec(schema); err != nil {
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return nil, fmt.Errorf("running migration: %w", err)
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}
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// Best-effort: adds columns for databases created before they existed.
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// Fails harmlessly if a column is already there.
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db.Exec("ALTER TABLE items ADD COLUMN position REAL NOT NULL DEFAULT 0")
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db.Exec("ALTER TABLE items ADD COLUMN sublist_id INTEGER")
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return db, nil
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}
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