chore: sub-store Go 重写项目初始化

internal/database/db.go

@@ -0,0 +1,48 @@
+package database
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/jmoiron/sqlx"
+	_ "modernc.org/sqlite"
+)
+
+// InitDB opens a SQLite connection and configures PRAGMAs per review-resolutions #28 and #45.
+//
+// modernc.org/sqlite is a pure-Go driver (CGO_ENABLED=0) — acceptable write-performance
+// tradeoff for a personal tool. To switch to mattn/go-sqlite3 (CGO), just change the
+// import and driver name; the interface stays the same.
+func InitDB(path string) (*sqlx.DB, error) {
+	dir := filepath.Dir(path)
+	if dir != "" && dir != "." {
+		if err := os.MkdirAll(dir, 0755); err != nil {
+			return nil, fmt.Errorf("create db directory: %w", err)
+		}
+	}
+
+	dsn := fmt.Sprintf("file:%s?_pragma=busy_timeout(5000)&_pragma=foreign_keys(1)", path)
+	db, err := sqlx.Connect("sqlite", dsn)
+	if err != nil {
+		return nil, fmt.Errorf("open sqlite: %w", err)
+	}
+
+	// Single connection avoids "database is locked" under concurrent writes.
+	// WAL mode allows readers to proceed while a write is in progress.
+	db.SetMaxOpenConns(1)
+
+	for _, pragma := range []string{
+		"PRAGMA journal_mode = WAL",
+		"PRAGMA busy_timeout = 5000",
+		"PRAGMA foreign_keys = ON",
+		"PRAGMA synchronous = NORMAL",
+	} {
+		if _, err := db.Exec(pragma); err != nil {
+			db.Close()
+			return nil, fmt.Errorf("exec %s: %w", pragma, err)
+		}
+	}
+
+	return db, nil
+}