> from sqlalchemy import create_engine > engine = create_engine ( "sqlite:///:memory:", echo = True ) Version Check ¶Ī quick check to verify that we are on at least version 1.4 of SQLAlchemy: Represents something you can type at a Python command prompt, and theįollowing text represents the expected return value. The following tutorial is in doctest format, meaning each > line Where specific database interactions are required. May make occasional usage of the Expression Language directly in certain areas In advanced situations, an application constructed with the ORM Representations which are explicitly composed into messages consumedĪ successful application may be constructed using the Object Relational MapperĮxclusively. The otherĪpproaches it from the perspective of literal schema and SQL expression Persisted and refreshed from its underlying storage model. User-defined domain model which is transparently One approaches the structure and content of data from the perspective of a Language, the similarities are more superficial than they may at first appear. While there is overlap among the usage patterns of the ORM and the Expression Presents a high level and abstracted pattern of usage, which itself is anĮxample of applied usage of the Expression Language. SQL Expression Language Tutorial (1.x API), presents a system of representing the primitiveĬonstructs of the relational database directly without opinion, the ORM Whereas the SQL Expression Language, introduced in The ORM is in contrast to the SQLAlchemy Expression Language, upon which the System that transparently synchronizes all changes in state between objectsĪnd their related rows, called a unit of work, as well as a systemįor expressing database queries in terms of the user defined classes and theirĭefined relationships between each other. User-defined Python classes with database tables, and instances of thoseĬlasses (objects) with rows in their corresponding tables. The SQLAlchemy Object Relational Mapper presents a method of associating $sth -> rowCount ().ORM Query is internally unified with select, update, delete 2.0 style execution available $sth = $pdh -> query ( "SELECT * FROM sys.tables" ) $pdh = new myPDO ( $dsn, $db_user, $db_pass ) $res = ( $values ) ? $sth -> execute ( $values ) : $sth -> execute () prepare ( $query, array( PDO :: ATTR_CURSOR => PDO :: CURSOR_SCROLL ))) In some drivers rowCount() only works when using the prepare() with PDO::CURSOR_SCROLL Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |