2018年5月29日笔记

　　本地已有一个单词本文件 "dictionary.txt"，编写脚本实现单词的模糊查询功能

• 1）连接到mysql上并定义表dictionary的表结构

from sqlalchemy import create_engine, MetaData, Table, Column, Integer, String


engine = create_engine('mysql+pymysql://root:passwd123@192.168.0.1/sqlalchemy')

metadata = MetaData(engine)

dictionary = Table('dictionary', metadata,
             Column('id', Integer, primary_key=True),
             Column('key', String(50)),
             Column('value', String(50))
             )

metadata.create_all(engine)

• 2）将dictionary.txt录入至dictionary这张表中

import codecs
from sqlalchemy import Integer, Column, String, create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker



engine = create_engine('mysql+pymysql://root:passwd123@192.168.0.1/sqlalchemy?charset=utf8')

Base = declarative_base()
class Dictionary(Base):
    __tablename__ = 'dictionary'
    id = Column(Integer, primary_key=True)
    key = Column(String(50))
    value = Column(String(50))

DBSession = sessionmaker(bind=engine)
session = DBSession()



class HandleData(object):
    def __init__(self, dataFile):
        self.dataFile = dataFile
    def make_data_to_str(self):
        with codecs.open(self.dataFile, encoding='utf-8') as file:
            for (num, value) in enumerate(file):
                line = value.strip().split()
                diction = Dictionary(id=num+1, key=line[0], value=line[1])
                session.add(diction)
        session.commit()


handleData = HandleData('dictionary.txt')
handleData.make_data_to_str()
session.close()

• 3）根据用户输入的英文单词进行模糊查询

from sqlalchemy import create_engine, Integer, Column, String
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

engine = create_engine('mysql+pymysql://root:passwd123@192.168.0.1/sqlalchemy?charset=utf8')

Base = declarative_base()
class Dictionary(Base):
    __tablename__ = 'dictionary'
    id = Column(Integer, primary_key=True)
    key = Column(String(50))
    value = Column(String(50))

DBSession = sessionmaker(bind=engine)
session = DBSession()

word = input("please input your a word:")
result =session.query(Dictionary).filter(Dictionary.key.like("%{0}%".format(word))).all()
for each in result:
    print(each.id, each.key, each.value)