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_matched_test.go

@@ -0,0 +1,100 @@
+package clauses
+
+import (
+	"strings"
+	"testing"
+
+	"gorm.io/gorm/clause"
+)
+
+func TestWhenMatchedName(t *testing.T) {
+	var w WhenMatched
+	if got := w.Name(); got != "WHEN MATCHED" {
+		t.Errorf("WhenMatched.Name() = %q, want %q", got, "WHEN MATCHED")
+	}
+}
+
+func TestWhenMatchedBuild(t *testing.T) {
+	w := WhenMatched{
+		Set: clause.Set{{Column: clause.Column{Name: "name"}, Value: "x"}},
+	}
+
+	sql := buildSQL(t, w)
+	// 期望: THEN UPDATE WHEN MATCHED SET name=:1
+	for _, want := range []string{
+		"THEN UPDATE",
+		"WHEN MATCHED",
+		"SET name=:1",
+	} {
+		if !strings.Contains(sql, want) {
+			t.Errorf("WhenMatched SQL %q does not contain %q", sql, want)
+		}
+	}
+}
+
+func TestWhenMatchedBuildMultipleSet(t *testing.T) {
+	w := WhenMatched{
+		Set: clause.Set{
+			{Column: clause.Column{Name: "name"}, Value: "x"},
+			{Column: clause.Column{Name: "age"}, Value: 1},
+		},
+	}
+
+	sql := buildSQL(t, w)
+	if want := "SET name=:1,age=:2"; !strings.Contains(sql, want) {
+		t.Errorf("WhenMatched SQL %q does not contain %q", sql, want)
+	}
+}
+
+func TestWhenMatchedBuildWithWhereAndDelete(t *testing.T) {
+	w := WhenMatched{
+		Set: clause.Set{{Column: clause.Column{Name: "name"}, Value: "x"}},
+		Where: clause.Where{Exprs: []clause.Expression{
+			clause.Eq{Column: clause.Column{Name: "id"}, Value: 1},
+		}},
+		Delete: clause.Where{Exprs: []clause.Expression{
+			clause.Eq{Column: clause.Column{Name: "flag"}, Value: 0},
+		}},
+	}
+
+	sql := buildSQL(t, w)
+	// 期望: THEN UPDATE WHEN MATCHED SET name=:1WHERE id = :2 DELETE WHERE flag = :3
+	for _, want := range []string{
+		"THEN UPDATE",
+		"WHEN MATCHED",
+		"SET name=:1",
+		"WHERE id = :2",
+		"DELETE WHERE flag = :3",
+	} {
+		if !strings.Contains(sql, want) {
+			t.Errorf("WhenMatched SQL %q does not contain %q", sql, want)
+		}
+	}
+}
+
+// TestWhenMatchedClauseBuild 验证通过 clause.Clause（gorm 真实构建流程）时的完整输出。
+func TestWhenMatchedClauseBuild(t *testing.T) {
+	w := WhenMatched{
+		Set: clause.Set{{Column: clause.Column{Name: "name"}, Value: "x"}},
+	}
+
+	sql := buildClauseSQL(t, "WHEN MATCHED", w)
+	for _, want := range []string{
+		"WHEN MATCHED",
+		"THEN UPDATE",
+		"SET name=:1",
+	} {
+		if !strings.Contains(sql, want) {
+			t.Errorf("WhenMatched SQL %q does not contain %q", sql, want)
+		}
+	}
+}
+
+func TestWhenMatchedBuildEmptySet(t *testing.T) {
+	var w WhenMatched
+
+	sql := buildSQL(t, w)
+	if sql != "" {
+		t.Errorf("WhenMatched with empty Set should generate no SQL, got %q", sql)
+	}
+}