# SQL (Relational) Databases { #sql-relational-databases }

**FastAPI** doesn't require you to use a SQL (relational) database. But you can use **any database** that you want.

Here we'll see an example using <a href="https://sqlmodel.tiangolo.com/" class="external-link" target="_blank">SQLModel</a>.

pkg database/sql, method (*Conn) QueryRowContext(context.Context, string, ...interface{}) *Row
pkg database/sql, method (*DB) Conn(context.Context) (*Conn, error)
pkg database/sql, type Conn struct
pkg database/sql, type Out struct
pkg database/sql, type Out struct, Dest interface{}
pkg database/sql, type Out struct, In bool
pkg database/sql, var ErrConnDone error

pkg database/sql, const LevelDefault = 0
pkg database/sql, const LevelDefault IsolationLevel
pkg database/sql, const LevelLinearizable = 7
pkg database/sql, const LevelLinearizable IsolationLevel
pkg database/sql, const LevelReadCommitted = 2
pkg database/sql, const LevelReadCommitted IsolationLevel
pkg database/sql, const LevelReadUncommitted = 1
pkg database/sql, const LevelReadUncommitted IsolationLevel

     contents in a database in which You have Sui Generis Database
     Rights, then the database in which You have Sui Generis Database
     Rights (but not its individual contents) is Adapted Material; and

  c. You must comply with the conditions in Section 3(a) if You Share
     all or a substantial portion of the contents of the database.

For the avoidance of doubt, this Section 4 supplements and does not

pkg database/sql, method (*NullByte) Scan(interface{}) error
pkg database/sql, method (*NullInt16) Scan(interface{}) error
pkg database/sql, method (NullByte) Value() (driver.Value, error)
pkg database/sql, method (NullInt16) Value() (driver.Value, error)
pkg database/sql, type NullByte struct
pkg database/sql, type NullByte struct, Byte uint8
pkg database/sql, type NullByte struct, Valid bool

use internally only data that doesn't depend on the resources of dependencies with `yield`.

For example, instead of using the same database session, you would create a new database session inside of the background task, and you would obtain the objects from the database using this new session. And then instead of passing the object from the database as a parameter to the background task function, you would pass the ID of that object and then obtain the object again inside the background...

So, you would be able to, for example, share the same data from a Django application in a database with a FastAPI application. Or gradually migrate a Django application using the same database.

And your users would be able to login from your Django app or from your **FastAPI** app, at the same time.

///

* Path operasyonu parametreleri içerisinde belirtilen gereksinimler için bile **Otomatik doğrulama** yapılabiliyor.
* Kompleks kimlik doğrulama sistemleri için destek, **database bağlantıları**, vs.
* **Taviz yok** hiçbir şeyden taviz vermeden, database frontend vs. Bütün hepsinin kolayca entegre edilebiliyor.

### Sınırsız "plug-inler"

      advanced/conditional-openapi.md: how-to/conditional-openapi.md
      advanced/extending-openapi.md: how-to/extending-openapi.md
      advanced/testing-database.md: how-to/testing-database.md
  mkdocstrings:
    handlers:
      python:
        options:
          extensions:
          - griffe_typingdoc
          show_root_heading: true
          show_if_no_docstring: true

import (
	"context"
	"database/sql"
	"fmt"
	"reflect"
	"sort"
	"sync"
	"time"

	"gorm.io/gorm/clause"
	"gorm.io/gorm/logger"
	"gorm.io/gorm/schema"
)

// for Config.cacheStore store PreparedStmtDB key
const preparedStmtDBKey = "preparedStmt"

// Config GORM config
type Config struct {
	// GORM perform single create, update, delete operations in transactions by default to ensure database data integrity