basic internal structure

internal/database/main.go

@@ -0,0 +1,32 @@
+package database
+
+import (
+	"database/sql"
+	"fmt"
+	"log"
+
+	_ "github.com/mattn/go-sqlite3"
+)
+
+func InitDB(db *sql.DB) {
+	schema := `
+	CREATE TABLE IF NOT EXISTS currencies (
+		id      INTEGER PRIMARY KEY AUTOINCREMENT,
+		code    TEXT    NOT NULL UNIQUE,
+		name    TEXT    NOT NULL
+	);
+
+	CREATE TABLE IF NOT EXISTS companies (
+		id                 INTEGER PRIMARY KEY AUTOINCREMENT,
+		name               TEXT    NOT NULL,
+		shares_outstanding INTEGER NOT NULL,
+		price              REAL    NOT NULL,
+		currency_id        INTEGER NOT NULL,
+		FOREIGN KEY (currency_id) REFERENCES currencies(id)
+	);`
+
+	if _, err := db.Exec(schema); err != nil {
+		log.Fatal("Failed to create tables:", err)
+	}
+	fmt.Println("Tables ready")
+}