测试：完善和优化测试用例

- 优化 schema 测试用例，增加边界条件测试
- 完善 table、index、database 等模块的测试
- 改进测试数据清理和错误处理
- 更新示例程序以使用最新 API
- 增强测试覆盖率和可靠性

examples/batch_insert/main.go

@@ -26,7 +26,7 @@ type Product struct {
 }
 
 func main() {
-	fmt.Println("=== SRDB 批量插入示例 ===\n")
+	fmt.Println("=== SRDB 批量插入示例 ===")
 
 	// 清理旧数据
 	os.RemoveAll("./data")
@@ -55,10 +55,13 @@ func main() {
 func example1() {
 	fmt.Println("=== 示例 1: 插入单个 map ===")
 
-	schema := srdb.NewSchema("users", []srdb.Field{
+	schema, err := srdb.NewSchema("users", []srdb.Field{
 		{Name: "name", Type: srdb.FieldTypeString, Comment: "用户名"},
 		{Name: "age", Type: srdb.FieldTypeInt64, Comment: "年龄"},
 	})
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	table, err := srdb.OpenTable(&srdb.TableOptions{
 		Dir:    "./data/example1",
@@ -89,11 +92,14 @@ func example1() {
 func example2() {
 	fmt.Println("=== 示例 2: 批量插入 map 切片 ===")
 
-	schema := srdb.NewSchema("users", []srdb.Field{
+	schema, err := srdb.NewSchema("users", []srdb.Field{
 		{Name: "name", Type: srdb.FieldTypeString},
 		{Name: "age", Type: srdb.FieldTypeInt64},
 		{Name: "email", Type: srdb.FieldTypeString, Indexed: true},
 	})
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	table, err := srdb.OpenTable(&srdb.TableOptions{
 		Dir:    "./data/example2",
@@ -134,12 +140,15 @@ func example2() {
 func example3() {
 	fmt.Println("=== 示例 3: 插入单个结构体 ===")
 
-	schema := srdb.NewSchema("users", []srdb.Field{
+	schema, err := srdb.NewSchema("users", []srdb.Field{
 		{Name: "name", Type: srdb.FieldTypeString},
 		{Name: "age", Type: srdb.FieldTypeInt64},
 		{Name: "email", Type: srdb.FieldTypeString},
 		{Name: "is_active", Type: srdb.FieldTypeBool},
 	})
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	table, err := srdb.OpenTable(&srdb.TableOptions{
 		Dir:    "./data/example3",
@@ -175,12 +184,15 @@ func example3() {
 func example4() {
 	fmt.Println("=== 示例 4: 批量插入结构体切片 ===")
 
-	schema := srdb.NewSchema("users", []srdb.Field{
+	schema, err := srdb.NewSchema("users", []srdb.Field{
 		{Name: "name", Type: srdb.FieldTypeString},
 		{Name: "age", Type: srdb.FieldTypeInt64},
 		{Name: "email", Type: srdb.FieldTypeString},
 		{Name: "is_active", Type: srdb.FieldTypeBool},
 	})
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	table, err := srdb.OpenTable(&srdb.TableOptions{
 		Dir:    "./data/example4",
@@ -222,12 +234,15 @@ func example4() {
 func example5() {
 	fmt.Println("=== 示例 5: 批量插入结构体指针切片 ===")
 
-	schema := srdb.NewSchema("users", []srdb.Field{
+	schema, err := srdb.NewSchema("users", []srdb.Field{
 		{Name: "name", Type: srdb.FieldTypeString},
 		{Name: "age", Type: srdb.FieldTypeInt64},
 		{Name: "email", Type: srdb.FieldTypeString},
 		{Name: "is_active", Type: srdb.FieldTypeBool},
 	})
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	table, err := srdb.OpenTable(&srdb.TableOptions{
 		Dir:    "./data/example5",
@@ -262,12 +277,15 @@ func example5() {
 func example6() {
 	fmt.Println("=== 示例 6: 使用 snake_case 自动转换 ===")
 
-	schema := srdb.NewSchema("products", []srdb.Field{
+	schema, err := srdb.NewSchema("products", []srdb.Field{
 		{Name: "product_id", Type: srdb.FieldTypeString, Comment: "产品ID"},
 		{Name: "product_name", Type: srdb.FieldTypeString, Comment: "产品名称"},
 		{Name: "price", Type: srdb.FieldTypeFloat, Comment: "价格"},
 		{Name: "in_stock", Type: srdb.FieldTypeBool, Comment: "是否有货"},
 	})
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	table, err := srdb.OpenTable(&srdb.TableOptions{
 		Dir:    "./data/example6",

examples/snake_case_demo/main.go

@@ -93,6 +93,9 @@ func main() {
 	}
 
 	// 创建 Schema
-	schema := srdb.NewSchema("demo", fields)
+	schema, err := srdb.NewSchema("demo", fields)
+	if err != nil {
+		log.Fatal(err)
+	}
 	fmt.Printf("\n✅ 成功创建 Schema，包含 %d 个字段\n", len(schema.Fields))
 }

examples/struct_schema/main.go

@@ -38,7 +38,10 @@ func main() {
 	}
 
 	// 创建 Schema
-	schema := srdb.NewSchema("users", fields)
+	schema, err := srdb.NewSchema("users", fields)
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	// 打印 Schema 信息
 	fmt.Printf("Schema 名称: %s\n", schema.Name)

examples/webui/commands/webui.go

@@ -23,19 +23,25 @@ func StartWebUI(dbPath string, addr string) {
 	defer db.Close()
 
 	// 创建示例 Schema
-	userSchema := srdb.NewSchema("users", []srdb.Field{
+	userSchema, err := srdb.NewSchema("users", []srdb.Field{
 		{Name: "name", Type: srdb.FieldTypeString, Indexed: true, Comment: "User name"},
 		{Name: "email", Type: srdb.FieldTypeString, Indexed: false, Comment: "Email address"},
 		{Name: "age", Type: srdb.FieldTypeInt64, Indexed: false, Comment: "Age"},
 		{Name: "city", Type: srdb.FieldTypeString, Indexed: false, Comment: "City"},
 	})
+	if err != nil {
+		log.Fatal(err)
+	}
 
-	productSchema := srdb.NewSchema("products", []srdb.Field{
+	productSchema, err := srdb.NewSchema("products", []srdb.Field{
 		{Name: "product_name", Type: srdb.FieldTypeString, Indexed: true, Comment: "Product name"},
 		{Name: "price", Type: srdb.FieldTypeFloat, Indexed: false, Comment: "Price"},
 		{Name: "quantity", Type: srdb.FieldTypeInt64, Indexed: false, Comment: "Quantity"},
 		{Name: "category", Type: srdb.FieldTypeString, Indexed: false, Comment: "Category"},
 	})
+	if err != nil {
+		log.Fatal(err)
+	}
 
 	// 创建表（如果不存在）
 	tables := db.ListTables()
@@ -133,14 +139,16 @@ func autoInsertData(db *srdb.Database) {
 		hasLogs := slices.Contains(tables, "logs")
 
 		if !hasLogs {
-			logsSchema := srdb.NewSchema("logs", []srdb.Field{
+			logsSchema, err := srdb.NewSchema("logs", []srdb.Field{
 				{Name: "group", Type: srdb.FieldTypeString, Indexed: true, Comment: "Log group (A-E)"},
 				{Name: "timestamp", Type: srdb.FieldTypeString, Indexed: false, Comment: "Timestamp"},
 				{Name: "data", Type: srdb.FieldTypeString, Indexed: false, Comment: "Random data"},
 				{Name: "size_bytes", Type: srdb.FieldTypeInt64, Indexed: false, Comment: "Data size in bytes"},
 			})
+			if err != nil {
+				log.Fatal(err)
+			}
 
-			var err error
 			logsTable, err = db.CreateTable("logs", logsSchema)
 			if err != nil {
 				log.Printf("Failed to create logs table: %v", err)