| 1 | <?php |
| 2 | |
| 3 | class Bd |
| 4 | { |
| 5 | private static ?PDO $pdo = null; |
| 6 | |
| 7 | static function pdo(): PDO |
| 8 | { |
| 9 | if (self::$pdo === null) { |
| 10 | |
| 11 | self::$pdo = new PDO( |
| 12 | |
| 13 | "sqlite:srvarchivos.db", |
| 14 | |
| 15 | null, |
| 16 | |
| 17 | null, |
| 18 | |
| 19 | [PDO::ATTR_PERSISTENT => false, PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION] |
| 20 | ); |
| 21 | |
| 22 | self::$pdo->exec( |
| 23 | 'CREATE TABLE IF NOT EXISTS ARCHIVO ( |
| 24 | ARCH_ID INTEGER, |
| 25 | ARCH_BYTES BLOB NOT NULL, |
| 26 | CONSTRAINT ARCH_PK |
| 27 | PRIMARY KEY(ARCH_ID) |
| 28 | )' |
| 29 | ); |
| 30 | self::$pdo->exec( |
| 31 | 'CREATE TABLE IF NOT EXISTS PRODUCTO ( |
| 32 | PROD_ID INTEGER, |
| 33 | PROD_NOMBRE TEXT NOT NULL, |
| 34 | ARCH_ID INTEGER NOT NULL, |
| 35 | CONSTRAINT PROD_PK |
| 36 | PRIMARY KEY(PROD_ID), |
| 37 | CONSTRAINT PROD_NOM_UNQ |
| 38 | UNIQUE(PROD_NOMBRE), |
| 39 | CONSTRAINT PROD_NOM_NV |
| 40 | CHECK(LENGTH(PROD_NOMBRE) > 0), |
| 41 | CONSTRAINT PROD_ARCH_FK |
| 42 | FOREIGN KEY (ARCH_ID) REFERENCES ARCHIVO(ARCH_ID) |
| 43 | )' |
| 44 | ); |
| 45 | } |
| 46 | |
| 47 | return self::$pdo; |
| 48 | } |
| 49 | } |
| 50 | |