SQLAlchemy是Python编程语言下的一款ORM框架,该框架建立在数据库API之上,使用关系对象映射进行数据库操作,简言之便是:将对象转换成SQL,然后使用数据API执行SQL并获取执行结果。 1、安装 pip3 install sqlalchemy 1. 2、架构与流程 #1、使用者通过ORM对象提交命令 #2、将命令交给SQLAlchemy Core(Schema/Types SQL Ex...
from sqlalchemy import create_engine engine = create_engine("mysql+pymysql://root:123@127.0.0.1:3306/t1", max_overflow=5) # 执行SQL # cur = engine.execute( # "INSERT INTO hosts (host, color_id) VALUES ('1.1.1.22', 3)" # ) # 新插入行自增ID # cur.lastrowid # 执行SQL # cur ...
使用Schema Type/SQL Expression Language/Engine/ConnectionPooling/Dialect 进行数据库操作。Engine使用Schema Type创建一个特定的结构对象,之后通过SQL Expression Language将该对象转换成SQL语句,然后通过 ConnectionPooling 连接数据库,再然后通过 Dialect 执行SQL,并获取结果。 代码语言:javascript 复制 from sqlalchemyimpor...
df = pd.read_sql_query(query_sql .substitute(arg1=tablename),engine)# 配合pandas的方法读取数据库值# 配合pandas的to_sql方法使用十分方便(dataframe对象直接入库)df.to_sql(table, engine, if_exists='replace', index=False)#覆盖入库df.to_sql(table, engine, if_exists='append', index=False)#增量...
from sqlalchemy import create_engine from urllib.parse import urlencode # 编码 URL 字符串 start_time = time.time() #计算程序运行时间 def get_one_page(i): try: headers = { 'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 ...
cursor.execute("PRAGMA foreign_keys=ON") cursor.close() Error u = sqlite:///:memory:, plugins = [] entrypoint = <class 'sqlalchemy.dialects.sqlite.pysqlite.SQLiteDialect_pysqlite'> pop_kwarg = <built-in method pop of dict object at 0x000002014FD611C0> ...
1 pip3 install sqlalchemy 组成部分： Engine，框架的引擎 Connection Pooling ，数据库...
SQLAlchemy中的query，有filter和filter_by两个函数 filter_by表内部精确查询 SQLAlchemy登录⽤户模块 from flask_sqlalchemy import SQLAlchemy db = SQLAlchemy()app = Flask(__name__)app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///tmp/test.db'create_engine from flask import Flask from flask_...
from sqlalchemy import create_engine import pandas as pd from string import Template # 初始化引擎 engine = create_engine('postgresql+psycopg2://' + pg_username + ':' + pg_password + '@' + pg_host + ':' + str(pg_port) + '/' + pg_database)query_sql = """select * from $arg1...
execute("commit") conn.execute("CREATE DATABASE %s" % database) except sqlalchemy.exc.SQLAlchemyError: pass self.url.database = database self.engine = create_engine(url) self.table.create(self.engine, checkfirst=True) 浏览完整代码 来源:projectdb.py 项目:01jiagnwei01/pyspider 示例20 def ...