1.cur.execute之後，一定要connect.commit()才會在資料庫中有相應結果。
import psycopg2 as p
con=p.connect(database='postgres',user='postgres',password='135246',host='127.0.0.1',port="5432")
# con=p.connect(database='postgres',user='postgres',password='135246',host='127.0.0.1',port='5432')
cur=con.cursor()
cur.execute('''
create table reader(
rno text primary key,
rname text not null,
r*** text,
rage int,
rboss text,
raddress text
);create table book(
bno text primary key,
bname text not null,
bauthor text,
bpress text,
bprice numeric
);create table rb(
rno text,
bno text,
rbdate date,
foreign key(rno) references reader(rno),
foreign key(bno) references book(bno)
);insert into reader (rno,rname,rage,r***,rboss, raddress) values('r001','張三',20,'男','李四','416');
insert into reader (rno,rname,rage,r***,rboss, raddress) values('r002','張三',35,'女',null,'417');
insert into reader (rno,rname,rage,r***,rboss, raddress) values('r003','李四',30,'男',null,'416');
insert into reader (rno,rname,rage,r***,rboss, raddress) values('r004','王五',20,'男',null,'417');
insert into reader (rno,rname,rage,r***,rboss, raddress) values('r005','馬六',40,'男',null,'416');
insert into reader (rno,rname,rage,r***,rboss, raddress) values('r006','劉三',20,'男',null,'417');
insert into reader (rno,rname,rage,r***,rboss, raddress) values('r007','王四',40,'男','李四','416');
insert into reader (rno,rname,rage,r***,rboss, raddress) values('r008','李小龍',20,'男','李四','417');
insert into reader (rno,rname,rage,r***,rboss, raddress) values('r009','王小倩',40,'男','李四','416');
insert into reader (rno,rname,rage,r***,rboss, raddress) values('r010','王一小',20,'男','李四','417');
insert into book (bno,bauthor,bname, bpress, bprice) values('b001','嚴蔚敏','資料結構','清華大學出版社',null);
insert into book (bno,bauthor,bname, bpress, bprice) values('b002','唐髮根','資料結構','北航出版社',24);
insert into book (bno,bauthor,bname, bpress, bprice) values('b003','王珊','資料庫原理','高等教育出版社',40);
insert into book (bno,bauthor,bname, bpress, bprice) values('b004','張飛','資料庫原理','清華大學出版社',30);
insert into book (bno,bauthor,bname, bpress, bprice) values('b005','王珊','資料庫原理','清華大學出版社',null);
insert into rb (rno,bno) values ('r001','b001');
insert into rb (rno,bno) values ('r001','b002');
insert into rb (rno,bno) values ('r001','b004');
insert into rb (rno,bno) values ('r002','b001');
insert into rb (rno,bno) values ('r003','b001');
insert into rb (rno,bno) values ('r004','b001');
insert into rb (rno,bno) values ('r004','b002');
insert into rb (rno,bno) values ('r005','b001');
insert into rb (rno,bno) values ('r006','b001');
insert into rb (rno,bno) values ('r006','b003');
insert into rb (rno,bno) values ('r006','b005');
insert into rb (rno,bno) values ('r006','b002');
insert into rb (rno,bno) values ('r006','b004');
''')
#這乙個是必須有的！！！
con.commit()#這個是必須有的！！！
con.close()
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