chore: 恢复旧布局基线（迁移改动丢失后重建，apps/packages 布局暂存）

server/internal/db/ddl_test.go

@@ -0,0 +1,94 @@
+package db
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+// newSQLiteFile 建一个 sqlite 测试库文件并执行建表/插数语句,返回 ConnReq。
+func newSQLiteFile(t *testing.T, stmts ...string) ConnReq {
+	t.Helper()
+	path := filepath.Join(t.TempDir(), "test.db")
+	if err := os.WriteFile(path, []byte{}, 0600); err != nil {
+		t.Fatal(err)
+	}
+	for _, s := range stmts {
+		res := ExecSQL(context.Background(), ConnReq{Driver: "sqlite", Database: path, SQL: s})
+		if res.Error != "" {
+			t.Fatalf("初始化语句失败 %q: %s", s, res.Error)
+		}
+	}
+	return ConnReq{Driver: "sqlite", Database: path}
+}
+
+// R2-B5:sqlite 返回 sqlite_master 中的原始建表语句。
+func TestGetDDLSQLite(t *testing.T) {
+	c := newSQLiteFile(t, `CREATE TABLE t_person (id INTEGER PRIMARY KEY, name TEXT NOT NULL, age INTEGER)`)
+	c.Table = "t_person"
+	ddl, err := GetDDL(context.Background(), c)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(ddl, "CREATE TABLE t_person") || !strings.Contains(ddl, "name TEXT") {
+		t.Fatalf("DDL 内容不符: %s", ddl)
+	}
+
+	c.Table = "no_such_table"
+	if _, err := GetDDL(context.Background(), c); err == nil {
+		t.Fatal("不存在的表应报错")
+	}
+}
+
+func TestGetDDLRedis(t *testing.T) {
+	_, err := GetDDL(context.Background(), ConnReq{Driver: "redis", Table: "k"})
+	if err == nil || !strings.Contains(err.Error(), "不支持") {
+		t.Fatalf("redis 应报不支持: %v", err)
+	}
+}
+
+func TestGetDDLMissingTable(t *testing.T) {
+	_, err := GetDDL(context.Background(), ConnReq{Driver: "sqlite", Table: ""})
+	if err == nil {
+		t.Fatal("空表名应报错")
+	}
+}
+
+// R2-B5:pg/mssql/oracle 族用列元数据拼装,各 family 引号不同。
+func TestBuildDDLFromColumns(t *testing.T) {
+	cols := []ColumnInfo{
+		{Name: "id", Type: "integer", Nullable: false, Key: "PRI"},
+		{Name: "na\"me", Type: "text", Nullable: true},
+	}
+	// pg:双引号加倍
+	ddl, err := buildDDLFromColumns("postgres", "public.t", cols)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(ddl, `"public"."t"`) || !strings.Contains(ddl, `"na""me" text`) ||
+		!strings.Contains(ddl, `"id" integer NOT NULL,`) || !strings.Contains(ddl, `PRIMARY KEY ("id")`) {
+		t.Fatalf("pg DDL 不符:\n%s", ddl)
+	}
+	// mssql:中括号
+	ddl, err = buildDDLFromColumns("mssql", "dbo.t", cols)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(ddl, `[id] integer NOT NULL`) || !strings.Contains(ddl, `PRIMARY KEY ([id])`) {
+		t.Fatalf("mssql DDL 不符:\n%s", ddl)
+	}
+	// oracle:原名
+	ddl, err = buildDDLFromColumns("oracle", "T", cols)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.Contains(ddl, `CREATE TABLE T (`) || !strings.Contains(ddl, `PRIMARY KEY (id)`) {
+		t.Fatalf("oracle DDL 不符:\n%s", ddl)
+	}
+	// 无列报错
+	if _, err := buildDDLFromColumns("postgres", "t", nil); err == nil {
+		t.Fatal("无列应报错")
+	}
+}