Initial commit

internal/schema/defaultSchema.go

@@ -0,0 +1,66 @@
+package schema
+
+import (
+	"github.com/jmoiron/sqlx"
+)
+
+type schema struct {
+	create string
+	drop   string
+}
+
+func MustCreate(db *sqlx.DB) {
+	db.MustExec(defaultSchema.create)
+}
+
+func MustDrop(db *sqlx.DB) {
+	db.MustExec(defaultSchema.drop)
+}
+
+// Type time_reserve stores the reserve time reserve by time
+// Type TIME(0) has minimal accuracy, counts down by seconds
+// Type SMALLDATETIME has format'YYYYMMDD hh:mm', for example '20090212 12:30', counts down by minuts
+var defaultSchema = schema{
+	create: `
+	CREATE TABLE IF NOT EXISTS Tables (
+    id INTEGER
+    CONSTRAINT PK_Tables PRIMARY KEY AUTOINCREMENT,
+    name INTEGER NOT NULL UNIQUE,
+    max_people INTEGER NOT NULL,
+    room TEXT NOT NULL,
+    CONSTRAINT CHK_max_people CHECK (
+      max_people > 0
+      AND max_people < 11
+    )
+  );
+  CREATE TABLE IF NOT EXISTS Bookings (
+    id INTEGER
+    CONSTRAINT PK_Bookings PRIMARY KEY AUTOINCREMENT,
+    id_tables INTEGER,
+    reservation TEXT NOT NULL,
+    time_reserve TEXT NOT NULL,
+    who_booked TEXT NOT NULL,
+    CONSTRAINT FK_Bookings_Tables FOREIGN KEY (id_tables) REFERENCES Tables (id),
+    CONSTRAINT CHK_min_max_time_reserve CHECK (time_reserve BETWEEN "00:30" AND "12:00")
+  );
+CREATE TRIGGER IF NOT EXISTS CHK_Bookings_Insert
+BEFORE INSERT ON Bookings
+BEGIN
+  SELECT RAISE(
+    FAIL,
+    "Reservation of table is not possible due to the existing reservation"
+  )
+  FROM (
+    SELECT
+      datetime(NEW.reservation) AS new_res_dt,
+      datetime(reservation) AS res_dt,
+      datetime(reservation, time_reserve) AS reserved_until,
+      id_tables
+    FROM Bookings
+  )
+  WHERE
+    (new_res_dt >= res_dt AND new_res_dt < reserved_until)
+    AND id_tables = NEW.id_tables;
+END;
+`,
+}