![]() In a similar way you could use any other ORM.īy default SQLite will only allow one thread to communicate with it, assuming that each thread would handle an independent request. Here we will see how to work with SQLAlchemy ORM. So, orion_ could be the name (from the name column in the owners table) of this pet's owner.Īnd the ORM will do all the work to get the information from the corresponding table owners when you try to access it from your pet object.Ĭommon ORMs are for example: Django-ORM (part of the Django framework), SQLAlchemy ORM (part of SQLAlchemy, independent of framework) and Peewee (independent of framework), among others. This way, you could also have an attribute orion_cat.owner and the owner would contain the data for this pet's owner, taken from the table owners. These ORMs also have tools to make the connections or relations between tables or entities. And the value of that attribute could be, e.g. With an ORM, you normally create a class that represents a table in a SQL database, each attribute of the class represents a column, with a name and a type.įor example a class Pet could represent a SQL table pets.Īnd each instance object of that class represents a row in the database.įor example an object orion_cat (an instance of Pet) could have an attribute orion_cat.type, for the column type. ORMs ¶įastAPI works with any database and any style of library to talk to the database.Ī common pattern is to use an "ORM": an "object-relational mapping" library.Īn ORM has tools to convert (" map") between objects in code and database tables (" relations"). The FastAPI specific code is as small as always. Notice that most of the code is the standard SQLAlchemy code you would use with any framework. In this tutorial, you have learned how to show the structure of a table in SQLite via a command-line shell program or SQL statement.OAuth2 with Password (and hashing), Bearer with JWT tokensĬreate SQLAlchemy models from the Base classĬreate Pydantic models / schemas for reading / returning WHERE name = 'albums' Code language: SQL (Structured Query Language) ( sql )Ĭode language: SQL (Structured Query Language) ( sql ) You can find the structure of a table by querying it from the sqlite_schema table as follows: SELECT sql FROM sqlite_schema The following picture shows the output: cid name type notnull dflt_value pkĢ ArtistId INTEGER 1 0 Getting the structure of a table using the SQL statement mode column Code language: SQL (Structured Query Language) ( sql )Īnd use the PRAGMA command as follows: pragma table_info( 'albums') Code language: JavaScript ( javascript ) To do it, you use the following command to format the output. INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,įOREIGN KEY () REFERENCES "artists" ()ĬREATE INDEX ON "albums" () Code language: SQL (Structured Query Language) ( sql )Īnother way to show the structure of a table is to use the PRAGMA command. Here is the output: CREATE TABLE IF NOT EXISTS "albums" schema will consider the albums as the table name and returns nothing because the table albums does not exist. Notice that there is no semicolon ( ) after the table name. schema albums Code language: SQL (Structured Query Language) ( sql ) schema table_name Code language: SQL (Structured Query Language) ( sql )įor example, the following command shows the statement that created the albums table. To find out the structure of a table via the SQLite command-line shell program, you follow these steps:įirst, connect to a database via the SQLite command-line shell program: sqlite3 c:\sqlite\db\chinook.db Code language: SQL (Structured Query Language) ( sql ) ![]() Getting the structure of a table via the SQLite command-line shell program Summary: in this tutorial, you will learn about various ways to show the structure of a table in SQLite.
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