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

clauses/when_not_matched_test.go

@@ -0,0 +1,93 @@
+package clauses
+
+import (
+	"strings"
+	"testing"
+
+	"gorm.io/gorm/clause"
+)
+
+func TestWhenNotMatchedName(t *testing.T) {
+	var w WhenNotMatched
+	if got := w.Name(); got != "WHEN NOT MATCHED" {
+		t.Errorf("WhenNotMatched.Name() = %q, want %q", got, "WHEN NOT MATCHED")
+	}
+}
+
+func TestWhenNotMatchedBuild(t *testing.T) {
+	w := WhenNotMatched{
+		Values: clause.Values{
+			Columns: []clause.Column{{Name: "name"}, {Name: "age"}},
+			Values:  [][]interface{}{{"x", 1}},
+		},
+	}
+
+	sql := buildClauseSQL(t, "WHEN NOT MATCHED", w)
+	// 期望: WHEN NOT MATCHED  THEN INSERT (name,age) VALUES (:1,:2)
+	for _, want := range []string{
+		"WHEN NOT MATCHED",
+		"THEN INSERT",
+		"(name,age)",     // 列名
+		"VALUES (:1,:2)", // VALUES 绑定参数
+	} {
+		if !strings.Contains(sql, want) {
+			t.Errorf("WhenNotMatched SQL %q does not contain %q", sql, want)
+		}
+	}
+}
+
+func TestWhenNotMatchedBuildWithWhere(t *testing.T) {
+	w := WhenNotMatched{
+		Values: clause.Values{
+			Columns: []clause.Column{{Name: "name"}},
+			Values:  [][]interface{}{{"x"}},
+		},
+		Where: clause.Where{Exprs: []clause.Expression{
+			clause.Eq{Column: clause.Column{Name: "deleted"}, Value: 0},
+		}},
+	}
+
+	sql := buildSQL(t, w)
+	for _, want := range []string{
+		"THEN INSERT",
+		"(name)",
+		"VALUES (:1)",
+		"WHERE deleted = :2",
+	} {
+		if !strings.Contains(sql, want) {
+			t.Errorf("WhenNotMatched SQL %q does not contain %q", sql, want)
+		}
+	}
+}
+
+func TestWhenNotMatchedBuildEmpty(t *testing.T) {
+	var w WhenNotMatched
+
+	sql := buildSQL(t, w)
+	if sql != "" {
+		t.Errorf("WhenNotMatched with empty Columns should generate no SQL, got %q", sql)
+	}
+}
+
+// TestWhenNotMatchedBuildPanicsOnMultipleRows 验证多行插入时按 Oracle 限制 panic。
+func TestWhenNotMatchedBuildPanicsOnMultipleRows(t *testing.T) {
+	w := WhenNotMatched{
+		Values: clause.Values{
+			Columns: []clause.Column{{Name: "name"}},
+			Values:  [][]interface{}{{"x"}, {"y"}},
+		},
+	}
+
+	defer func() {
+		r := recover()
+		if r == nil {
+			t.Fatal("expected panic for multiple insert rows")
+		}
+		msg, ok := r.(string)
+		if !ok || !strings.Contains(msg, "cannot insert more than one rows") {
+			t.Errorf("unexpected panic message: %v", r)
+		}
+	}()
+
+	buildSQL(t, w)
+}