feat: Oracle 驱动完整化——回调体系、版本感知、驱动抽象层与测试套件

- 新增驱动抽象层 driver_adapter（go-ora/godror 双驱动切换）
- 新增 Update/Delete/Query 回调，完善 RETURNING INTO 子句
- 修复 create.go 事务悬挂行 BUG、批量 RowsAffected、主键 WHERE 注入
- 版本感知体系：分页/自增/序列默认值/BOOLEAN/32k VARCHAR2 分级能力判定
- 11g 序列+触发器自增、ON UPDATE 触发器、默认值智能转换
- 升级 go-ora v2.8.19 → v2.9.0
- 单元测试+模块测试+集成测试共 96 个，真实 Oracle 11g 全绿
- 测试 DSN 密码移除，改为 ORACLE_DSN 环境变量注入

tests/delete_test.go

@@ -0,0 +1,70 @@
+package tests
+
+import (
+	"testing"
+)
+
+func TestDeleteSingle(t *testing.T) {
+	// 先确保表存在并清空
+	if err := DB.AutoMigrate(&User{}); err != nil {
+		t.Fatalf("failed to migrate: %v", err)
+	}
+	clearTable(t, "TEST_USERS")
+
+	// 创建测试数据
+	user := User{Name: "Delete Test", Email: "delete@example.com", Age: 40}
+	DB.Create(&user)
+
+	// 删除
+	result := DB.Delete(&user)
+	if result.Error != nil {
+		t.Fatalf("failed to delete: %v", result.Error)
+	}
+
+	// 验证软删除（如果有 deleted_at）
+	var deleted User
+	result = DB.First(&deleted, user.ID)
+	if result.Error == nil {
+		t.Error("expected user to be soft deleted")
+	}
+}
+
+func TestDeleteWithoutWhere(t *testing.T) {
+	// 确保表存在
+	if err := DB.AutoMigrate(&User{}); err != nil {
+		t.Fatalf("failed to migrate: %v", err)
+	}
+	clearTable(t, "TEST_USERS")
+
+	// 测试无 WHERE 条件的删除应该失败
+	result := DB.Delete(&User{})
+	if result.Error == nil {
+		t.Error("expected error for delete without WHERE condition")
+	}
+	t.Logf("Got expected error: %v", result.Error)
+}
+
+func TestHardDelete(t *testing.T) {
+	// 先确保表存在并清空
+	if err := DB.AutoMigrate(&User{}); err != nil {
+		t.Fatalf("failed to migrate: %v", err)
+	}
+	clearTable(t, "TEST_USERS")
+
+	// 创建测试数据
+	user := User{Name: "Hard Delete", Email: "hard@example.com", Age: 50}
+	DB.Create(&user)
+
+	// 硬删除
+	result := DB.Unscoped().Delete(&user)
+	if result.Error != nil {
+		t.Fatalf("failed to hard delete: %v", result.Error)
+	}
+
+	// 验证完全删除
+	var deleted User
+	result = DB.Unscoped().First(&deleted, user.ID)
+	if result.Error == nil {
+		t.Error("expected user to be completely deleted")
+	}
+}