Question

我正在尝试将.csv文件中的数据插入到sqlalchemy表中-除字符串外的所有数据类型均已正确插入表中。

csv数据的示例是：

Version=1.1
636706156850400000,-1.54752188,53.79451,HUL4,3809,20,1014.63495,M
636706156850800000,-1.54752056,53.7945102,HUL4,3809,20,1014.53614,M
636706156851200000,-1.54751925,53.7945104,HUL4,3809,20,1014.43734,M

相关的python代码是：

class Gpxmm_Coverage(Base):
    __tablename__ = 'Gpxmm_Coverage'
    __table_args__ = {'sqlite_autoincrement': True}
    id = Column(Integer, primary_key=True, nullable=False) 
    gps = Column(Integer)
    x = Column(Float)
    y = Column(Float)
    elr = Column(String)
    trid = Column(Integer)
    m = Column(Integer)
    yards = Column(Float)
    type = Column(String)

但是，当浏览数据时（在Mac上使用DB浏览器用于SQLite），elr和type列显示为'NULL'。所有其他列均具有正确的值类型。

Answer 1

从csv加载elr和type时，请确保str是length。
文档建议为String类型指定FirebaseRecyclerAdapter<NoteModel, NoteViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<NoteModel, NoteViewHolder>( NoteModel.class, R.layout.note_card, NoteViewHolder.class, fNotesDatabase) { @Override protected void populateViewHolder(final NoteViewHolder viewHolder, NoteModel model, int position) { final String noteId = getRef(position).getKey(); Log.e("MainActivity","Populate View"); fNotesDatabase.child(noteId).addValueEventListener(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { if (dataSnapshot.hasChild("mTitle") && dataSnapshot.hasChild("mTime")) { String title = dataSnapshot.child("mTitle").getValue().toString(); String timestamp = dataSnapshot.child("mTime").getValue().toString(); String content = dataSnapshot.child("mContent").getValue().toString(); GetTimeAgo getTimeAgo = new GetTimeAgo(); viewHolder.setTime(getTimeAgo.getTimeAgo(Long.parseLong(timestamp), getApplicationContext())); viewHolder.setTitle(title); //viewHolder.setNoteTime(timestamp); viewHolder.setContent(content); viewHolder.setTime(timestamp); Log.e("MainActivity","Data retrieval"+title); } } @Override public void onCancelled(DatabaseError databaseError) { } }); } }; recyclerView.setAdapter(firebaseRecyclerAdapter);参数，例如列（String（64））

https://docs.sqlalchemy.org/en/latest/core/type_basics.html#sqlalchemy.types.String

SQLalchemy中的字符串值显示为NULL

1 个答案: