python sqlalchemy中create_engine用法
用法
engine = create_engine('dialect+driver://username:password@host:port/database')
dialect -- 数据库类型
driver -- 数据库驱动选择
username -- 数据库用户名
password -- 用户密码
host 服务器地址
port 端口
database 数据库
engine = create_engine('postgresql+psycopg2://scott:tiger@localhost/mydatabase')
pg8000
engine = create_engine('postgresql+pg8000://scott:tiger@localhost/mydatabase')
More notes on connecting to PostgreSQL at PostgreSQL.
MySQL
The MySQL dialect uses mysql-python as the default DBAPI. There are many MySQL DBAPIs available, including MySQL-connector-python and OurSQL:
# default
engine = create_engine('mysql://scott:tiger@localhost/foo')mysql-python
engine = create_engine('mysql+mysqldb://scott:tiger@localhost/foo')
MySQL-connector-python
engine = create_engine('mysql+mysqlconnector://scott:tiger@localhost/foo')
Oracle
create_engine('oracle://scott:[email protected]:1521/sidname')
MSSQL
engine = create_engine('mssql+pyodbc://scott:tiger@mydsn')
engine = create_engine('mssql+pymssql://scott:tiger@hostname:port/dbname')
下面mysql作为例子
yconnect = create_engine('mysql+mysqldb://root:password@host:port/db?charset=utf8')
pd.io.sql.to_sql(DataResultDF,'tablename', yconnect, schema='db', if_exists='append')
创建表结构
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。
from sqlalchemy import create_engine, Table, Column, Integer, /
String, MetaData, ForeignKey
import MySQLdb
#创建数据库连接
engine = create_engine("mysql+mysqldb://liuyao:[email protected]:3306/liuyao", max_overflow=5)
# 获取元数据
metadata = MetaData()
# 定义表
user = Table('user', metadata,
Column('id', Integer, primary_key=True),
Column('name', String(20)),
)
color = Table('color', metadata,
Column('id', Integer, primary_key=True),
Column('name', String(20)),
)
#将dataframe 添加到 tmp_formidinfo 如果表存在就添加，不存在创建并添加
pd.io.sql.to_sql(DataResultDF,'tmp_formidinfo',engine, schema='liuyao', if_exists='append')
# 执行sql语句
engine.execute(
"INSERT INTO liuyao.color(id, name) VALUES ('1', 'liuyao');"
)
result = engine.execute('select * from color')
print(result.fetchall())
摘抄于 https://www.jianshu.com/p/f039da1d90ce 简书