sqlalchemy select

importsqlalchemyfromsqlalchemy.ext.declarativeimportdeclarative_basefrom sqlalchemyimportcolumn,integer,string,foreignkey,uniqueconstraint, index,datefromsqlalchemy.ormimportsessionmaker,relationshipfromsqlalchemy Importcreate_engine,textimportdatetime,pymysql,hashlib,getpass,refromcoreimport NBSP;SETTINGHASHNBSP;=NBSP;HASHLIB.MD5 () hash.update (' 123456 '. Encode ()) default_pw=hash.hexdigest () Mysql_user =setting.mysql_usermysql_pw=setting.mysql_pwmysql_host=setting.mysql_ Hostmysql_port=set

create to this session, and create a unified Print(User_obj.name, User_obj.id)#This is still not created yet . Session.commit ()#Now this is the unified submission, create data #Insert End #Query StartMy_user = session.query (user). filter_by (name="Alex"). First ()Print(My_user)Print(My_user.id, My_user.name, My_user.password)#End of Query #Modify StartMy_user = session.query (user). filter_by (name="Alex"). First () My_user.name="Alex Li"Session.commit ()#Modify Technology #Multi-Criteria

Tags: character models root type directory no model generated POSAutomatically generated SQLAlchemy models files of the package has been used, there is a field type has been changed, adjusted 10 minutes before the fix. Log the Python package that automatically generates the models file SqlacodegenSqlacodegen has joined PyPI and only needs to use PIP install Sqlacodegen to install theAfter installation, you can run the command to generate the models.py

ORM(Object Relational mapping): Object Relational mapping .Python is object -oriented, and the database is relational .ORM is the mapping of database relationships to objects in Python, without the need to write directly to SQL.The disadvantage is that performance is slightly worse .Through Sessionmaker, we get a class, a factory that can produce a session.For the purpose of using scoped_session, Word: for thread safety .Scoped_session is similar to singleton mode , when we call to use, we will

Tags: mit log _id Code. SQL ONS Color mod URI1. Installing SQLAlchemyPip Install Flask-sqlalchemy2. Import and configure fromFlask_sqlalchemyImportSQLAlchemy Basedir= Path.dirname (__file__) App.config.from_pyfile ('Config') app.config['Sqlalchemy_database_uri'] = 'sqlite:///'+ Path.join (Base.dir,'Data.sqlite') app.config['Sqlalchemy_commit_on_teardown'] = True3. Create a Table classclassRole (db. Model):__tablename__='Roles'ID= db. Column (db. Integer, primary_key=True) name= db. Column (d

' or False for the" - "synchronize_session parameter.") + A #Todo:detect when the WHERE clause is a trivial primary key match atSelf.matched_objects = [ -Obj for(CLS, PK), objinch - Query.session.identity_map.items () - ifIssubclass (CLS, TARGET_CLS) and -Eval_condition (obj)] After the delete or update operation, the eligible records are deleted or updated. 1 def _do_post_synchronize (self): 2 self.query.session._remove_newly_deleted ( 3

#简单查询Print (Session.query (User). All ())Print (Session.query (User.Name, User.fullname). All ())Print (Session.query (User, User.Name). All ()) #带条件查询Print (Session.query (User) filter_by (name= ' user1 '). All ())Print (session.query (user). filter (User.Name = = "User"). All ())Print (Session.query (User). Filter (User.name.like ("user%")). All ()) #多条件查询Print (Session.query (User). Filter (And_ (User.name.like ("user%"), User.fullname.like ("first%")). All ())Print (Session.query (User). Fil

). From_statement (Text ("Select* from users where Name=:name")). \Params (name= ' Ed '). All ()You can also use from_statement () to get the full "raw", using the character name to determine the specific column you want to query : Session.query ("id", "name", "Thenumber12"). \from_statement (Text ("Select ID, Name," "thenumber12 from users where Name=:name")).Params (name= ' Ed '). All ()[(1,u ' Ed ', 12)

:@192.168.6.112:1433/factoryhome?driver=sql+server+native+ client+10.0") Another is through the Microsoft DSN connection, if you do not know the DSN connection, you can Baidu to see what it means Insertion of data fromSQLAlchemyImport*engine=create_engine ("mssql+pyodbc://sa:@192.168.6.112:1433/factoryhome?driver=sql+server+native+client+10.0") Metadata=MetaData () table_1=table ("Table_1", metadata, Column ("Code", String (Ten)), Column ("Name", String (10)) ins=table_1.insert (). VALUES (code

Copy CodeThe code is as follows: def sa_obj_to_dict (obj, Filtrate=none, Rename=none): """ SQLAlchemy object to Dict :p Aram filtrate: Filtered Fields : Type filtrate:list or tuple :p Aram Rename: Renaming is required, rename is processed after filtering, key is the property name of the original object, value is required to change the name : Type Rename:dict : rtype:dict """ If Isinstance (obj.__class__, Declarativemeta):# an

Studies the ing between SQLAlchemy databases in the Python ORM framework, ormsqlalchemy We have introduced the User table about the User account, but in real life, with the complexity of the problem, the data stored in the database cannot be so simple. Let's imagine another table, this table is associated with the User and can be mapped and queried. Therefore, this table can store any number of email addresses associated with an account. This relation

Datetime.datetime Date and time Largebinary Str binary files Used insqlalchemy Relationship Options Option name Description Primary_key If true, represents the primary key for the table Unique If true, this column does not allow duplicate values Index If true, create an index for this column to improve query efficiency Nullable

Tags: Eve cal bind nbsp ROR string Pytho address CEPFirst you need a module sshtunnel, if there is no direct pip install SshtunnelFrom Sshtunnel import sshtunnelforwarderfrom sqlalchemy import Column, String, Integer, Create_engine, Eventfrom Sqlalche My.orm Import sessionmakerfrom sqlalchemy.ext.declarative import declarative_basefrom sqlalchemy.exc Import Disconnectionerrorssh_host = "" # Fortress machine IP address or hostname ssh_port = 22 # The p

Many-to-many table structure creationFrom SQLAlchemy import Create_engineFrom sqlalchemy.ext.declarative import declarative_baseFrom SQLAlchemy import Column, Integer, String, ForeignKey, UniqueConstraint, IndexFrom Sqlalchemy.orm import Sessionmaker, relationshipEngine = Create_engine ("Mysql+pymysql://root:[email protected]:3306/web", max_overflow=5)Base = Declarative_base (engine)Session = Sessionmaker (

Tags: run trap bootstra sed style key ase Roo 127.0.0.1In the Flask project, establish a models.py in the configuration database as follows: 1 #-*-coding:utf-8-*- 2 ImportOS3 fromFlaskImportFlask4 fromItsdangerousImportTimedjsonwebsignatureserializer as Serializer5 fromFlaskImportCurrent_app6 from.ImportDB7 fromFlask_sqlalchemyImportSQLAlchemy8 fromWerkzeug.securityImportGenerate_password_hash, Check_password_hash9 fromFlask_loginImportusermixinTen fromFlask_loginImportlogin_required One

Tags: Clipboard python object ext problem top mil case blank aboutUsing SQLAlchemy can easily read the data from the Python object in the form of a database (spit slot: To tell the truth, the form of the object is not much convenient, as I have directly read from the relational database dict form of data to use it handy, see my previous article http:// ZHENGXIAOYAO0716.LOFTER.COM/POST/1D6E9C56_93D6D00))However, data in the form of objects is inconveni

Tags: format mysql entity test creat span entity class IV SEL1.sqlalchemy is an ORM framework and uses meta-programming extensively ImportSQLAlchemy fromSQLAlchemyImportCreate_engine fromSqlalchemy.ext.declarativeImportDeclarative_base fromSQLAlchemyImportcolumn,integer,date,string connect_string="{}://{}:{}@{}:{}/{}". Format ('Mysql+pymysql', 'Test', '1QAZXSW2', '127.0.0.1', '3306', 'Blog') Engine= Create_engine (connect_string,ec

Continue on a sqlalchemy learning journey.Creation of many-to-many tablesTable host and table Hostuser are associated by table Hosttohostuserfromsqlalchemyimportcreate_enginefromsqlalchemy.ext.declarativeimport Declarative_basefromsqlalchemyimportcolumn,integer,string,foreignkey, UniqueConstraint,Index,Tablefromsqlalchemy.ormimportsessionmaker, Relationshipengine=create_engine ("Mysql+pymysql://yli:[emailprotected]:3306/mydb", max_ overflow=5) Base=de

curriculum, the relational table is the elective table, where the relational table is based on the joint primary key and the curriculum primary key. 2 SQLAlchemy Table Relationship Usage 2.1 Pair of Multi Like a father can have more than one child, ClassParent(Base):__tablename__=' Parent 'Id=Column(Integer,Primary_key=True)Children= Relationship ( "child" ) class child (base): __tablename__ = ' child ' id = column ( integerprimary_key=True) p

Tags: Content default method Pre tab Welcome flag bit Data Sheet impInstalling Flask-sqlalchemyPip Install Flask-sqlalchemyLoad SQLAlchemyAdd in hello.py From Flask.ext.sqlalchemy import SQLAlchemy Initialize settingsAdd in hello.py Set Database link Address 1 app.config['sqlalchemy_database_uri'mysql+mysqldb:// :@/charset=utf8' Create User Class1 classUser (db. Model):2 __tablename__='username' 3ID = db. Column (db. integer,primary_key=True)4Nam