Step 3：Study / Site / StudyMember + 项目权限

backend/app/crud/member.py

@@ -0,0 +1,64 @@
+import uuid
+from typing import Sequence
+
+from sqlalchemy import select, update
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.models.study_member import StudyMember
+from app.schemas.member import StudyMemberCreate, StudyMemberUpdate
+
+
+async def get_member(db: AsyncSession, study_id: uuid.UUID, user_id: uuid.UUID) -> StudyMember | None:
+    result = await db.execute(
+        select(StudyMember).where(StudyMember.study_id == study_id, StudyMember.user_id == user_id)
+    )
+    return result.scalar_one_or_none()
+
+
+async def get_member_by_id(db: AsyncSession, member_id: uuid.UUID) -> StudyMember | None:
+    result = await db.execute(select(StudyMember).where(StudyMember.id == member_id))
+    return result.scalar_one_or_none()
+
+
+async def add_member(db: AsyncSession, study_id: uuid.UUID, member_in: StudyMemberCreate) -> StudyMember:
+    member = StudyMember(
+        study_id=study_id,
+        user_id=member_in.user_id,
+        role_in_study=member_in.role_in_study,
+        is_active=member_in.is_active,
+    )
+    db.add(member)
+    await db.commit()
+    await db.refresh(member)
+    return member
+
+
+async def list_members(db: AsyncSession, study_id: uuid.UUID, skip: int = 0, limit: int = 100) -> Sequence[StudyMember]:
+    result = await db.execute(
+        select(StudyMember).where(StudyMember.study_id == study_id).offset(skip).limit(limit)
+    )
+    return result.scalars().all()
+
+
+async def update_member(db: AsyncSession, member: StudyMember, member_in: StudyMemberUpdate) -> StudyMember:
+    update_data = {k: v for k, v in member_in.model_dump(exclude_unset=True).items() if v is not None}
+    if update_data:
+        await db.execute(
+            update(StudyMember)
+            .where(StudyMember.id == member.id)
+            .values(**update_data)
+        )
+        await db.commit()
+    await db.refresh(member)
+    return member
+
+
+async def remove_member(db: AsyncSession, member: StudyMember) -> StudyMember:
+    await db.execute(
+        update(StudyMember)
+        .where(StudyMember.id == member.id)
+        .values(is_active=False)
+    )
+    await db.commit()
+    await db.refresh(member)
+    return member