如何在flask-sqlalchemy中插入另一个表的主键值的外键值？

Question

我现在有两个表，我试图做出这两个表之间的一对多关系，但我不知道如何在我的表2中插入外键列。

这是表1的代码和2数据库：

class Calc(db.Model): 
    __tablename__ = 'calc' 
    id = db.Column(db.Integer, primary_key=True) 
    pjt = db.Column(db.String(100)) 
    cse = db.Column(db.Integer) 
    rmk = db.Column(db.String(100)) 

    gor = db.Column(db.Float(20)) 
    og = db.Column(db.Float(20)) 
    gg = db.Column(db.Float(20)) 
    temp = db.Column(db.Float(20)) 
    press = db.Column(db.Float(20)) 
    h2s = db.Column(db.Float(20)) 
    co2 = db.Column(db.Float(20)) 
    n2 = db.Column(db.Float(20)) 
    ppm = db.Column(db.Float(20)) 
    cor1 = db.Column(db.String(100)) 
    cor2 = db.Column(db.String(100)) 
    cor3 = db.Column(db.String(100)) 
    cor4 = db.Column(db.String(100)) 

    pb = db.Column(db.Float(20)) 
    rs = db.Column(db.Float(20)) 
    bo = db.Column(db.Float(20)) 
    co = db.Column(db.Float(20)) 
    uo = db.Column(db.Float(20)) 
    po = db.Column(db.Float(20)) 
    z = db.Column(db.Float(20)) 
    bg = db.Column(db.Float(20)) 
    pg = db.Column(db.Float(20)) 
    ug = db.Column(db.Float(20)) 
    bw = db.Column(db.Float(20)) 
    uw = db.Column(db.Float(20)) 
    pw = db.Column(db.Float(20)) 
    cw = db.Column(db.Float(20)) 
    iow = db.Column(db.Float(20)) 
    iog = db.Column(db.Float(20)) 
    iwg = db.Column(db.Float(20)) 

    process4 = db.relationship('Matching', backref='case', lazy='dynamic') 

class Matching(db.Model): 
    id = db.Column(db.Integer,primary_key=True) 
    proc_id = db.Column(db.Integer, db.ForeignKey('calc.id')) 

    pjt = db.Column(db.String(100)) 
    cse = db.Column(db.Integer) 

    temp = db.Column(db.Float(20)) 
    pb = db.Column(db.Float(20)) 
    press = db.Column(db.Float(20)) 
    rs = db.Column(db.Float(20)) 
    bo = db.Column(db.Float(20)) 
    uo = db.Column(db.Float(20)) 

    pbG1 = db.Column(db.Float(20)) 
    pbG2 = db.Column(db.Float(20)) 
    pbS1 = db.Column(db.Float(20)) 
    pbS2 = db.Column(db.Float(20)) 
    pbVB1 = db.Column(db.Float(20)) 
    pbVB2 = db.Column(db.Float(20)) 
    pbP1 = db.Column(db.Float(20)) 
    pbP2 = db.Column(db.Float(20)) 
    pbAM1 = db.Column(db.Float(20)) 
    pbAM2 = db.Column(db.Float(20)) 

    rsG1 = db.Column(db.Float(20)) 
    rsG2 = db.Column(db.Float(20)) 
    rsS1 = db.Column(db.Float(20)) 
    rsS2 = db.Column(db.Float(20)) 
    rsVB1 = db.Column(db.Float(20)) 
    rsVB2 = db.Column(db.Float(20)) 
    rsP1 = db.Column(db.Float(20)) 
    rsP2 = db.Column(db.Float(20)) 
    rsAM1 = db.Column(db.Float(20)) 
    rsAM2 = db.Column(db.Float(20)) 

    boG1 = db.Column(db.Float(20)) 
    boG2 = db.Column(db.Float(20)) 
    boS1 = db.Column(db.Float(20)) 
    boS2 = db.Column(db.Float(20)) 
    boVB1 = db.Column(db.Float(20)) 
    boVB2 = db.Column(db.Float(20)) 
    boP1 = db.Column(db.Float(20)) 
    boP2 = db.Column(db.Float(20)) 
    boAM1 = db.Column(db.Float(20)) 
    boAM2 = db.Column(db.Float(20)) 

    uoBG1 = db.Column(db.Float(20)) 
    uoBG2 = db.Column(db.Float(20)) 
    uoBL1 = db.Column(db.Float(20)) 
    uoBL2 = db.Column(db.Float(20)) 

这是代码来保存到数据库：

db.session.add(Matching(temp=mtemp, pb=mbppress, press=mpress, rs=mrrs, 
bo=mbbo,uo=muo, pbG1=session['mpb1'], pbG2=session['cpb1'], 
pbS1=session['mpb2'], pbS2=session['cpb2'],pbVB1=session['mpb3'], 
pbVB2=session['cpb3'], pbP1=session['mpb4'], pbP2=session['cpb4'], 
pbAM1=session['mpb5'],pbAM2=session['cpb5'],rsG1=session['mrs1'], 
rsG2=session['crs1'], rsS1=session['mrs2'], rsS2=session['crs2'], 
rsVB1=session['mrs3'], rsVB2=session['crs3'], rsP1=session['mrs4'], 
rsP2=session['crs4'],rsAM1=session['mrs5'], rsAM2=session['crs5'], 
boG1=session['mbo1'], boG2=session['cbo1'], boS1=session['mbo2'], 
boS2=session['cbo2'],boVB1=session['mbo3'], boVB2=session['cbo3'], 
boP1=session['mbo4'], boP2=session['cbo4'],boAM1=session['mbo5'], 
boAM2=session['cbo5'],uoBG1=session['muo1'], uoBG2=session['cuo1'],          
uoBL1=session['muo2'],uoBL2=session['cuo2'], pjt=exf.pjt.data.pjt, 
cse=exf.cse.data.cse)) 

db.session.commit() 

这是表1和2的图像：

表1

表2

这是我的计算器实例：

db.session.add_all([Calc(gor=ingor, og=inog, gg=ingg, temp=intemp, 
press=inpress, h2s=inh2s, co2=inco2, 
n2=inn2, ppm=inppm, cor1=cor1, cor2=cor2, cor3=cor3, cor4=cor4, 
pb=session['xpb'], rs=session['xrs'], bo=session['xbo'], co=session['xco'], 
uo=session['xuo'], po=session['xpo'], 
z=session['xz'], bg=session['xbg'], pg=session['xpg'], ug=session['xug'], 
pjt=form.pjt.data.pjt, cse=form.cse.data.cse, rmk=form.rmk.data, 
bw=session['xbw'], uw=session['xuw'], pw=session['xpw'], cw=session['xcw'], 
iow=session['xiow'], iog=session['xiog'], iwg=session['xiwg'])]) 

db.session.commit() 

希望有人能帮助我，谢谢。

Answer 1

您可以添加proc_id作为任何其他领域。当您创建calc将其分配给变量时，刷新会话并获取id（刷新将获得要插入的行的id）。例如：

calc = Calc(...) 
db.session.add_all([calc]) 
db.session.flush() # at this point calc has id 
db.session.add(Matching(proc_id=calc.id, ...) 
db.session.commit()