// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

TEXT errors(SB),$0
	MOVW	(F0), R1           // ERROR "illegal base register"
	MOVB	(F0), R1           // ERROR "illegal base register"
	MOVH	(F0), R1           // ERROR "illegal base register"
	MOVF	(F0), F1           // ERROR "illegal base register"
	MOVD	(F0), F1           // ERROR "illegal base register"

</p>

<ol>
	<li>The <i>universe block</i> encompasses all Go source text.</li>

	<li>Each <a href="#Packages">package</a> has a <i>package block</i> containing all
	    Go source text for that package.</li>

	<li>Each file has a <i>file block</i> containing all Go source text
	    in that file.</li>

	<li>Each <a href="#If_statements">"if"</a>,

    SQLModel будет знать, что объявленное как `str` станет SQL-столбцом типа `TEXT` (или `VARCHAR`, в зависимости от базы данных).

### Создание Engine { #create-an-engine }

Объект `engine` в SQLModel (под капотом это `engine` из SQLAlchemy) **удерживает соединения** с базой данных.

    * 다른 기사나 아이디어들을 읽고, 제가 만들어왔던 툴에 대해서도 읽으십시오.
    * 새로운 기사를 읽기 위해 팔로우 하십시오.

## **FastAPI**에 대한 트윗

<a href="https://x.com/compose/tweet?text=I'm loving @fastapi because... https://github.com/fastapi/fastapi" class="external-link" target="_blank">**FastAPI**에 대해 트윗</a> 하고 FastAPI가 마음에 드는 이유를 알려주세요. 🎉

			return
		}
	}
	b.err = io.ErrNoProgress
}

func (b *Reader) readErr() error {
	err := b.err
	b.err = nil
	return err
}

// Peek returns the next n bytes without advancing the reader. The bytes stop
// being valid at the next read call. If necessary, Peek will read more bytes
// into the buffer in order to make n bytes available. If Peek returns fewer

    O SQLModel saberá que algo declarado como `str` será uma coluna SQL do tipo `TEXT` (ou `VARCHAR`, dependendo do banco de dados).

### Criar um Engine { #create-an-engine }
Um `engine` SQLModel (por baixo dos panos, ele é na verdade um `engine` do SQLAlchemy) é o que **mantém as conexões** com o banco de dados.

				if o < 0 {
					return -1
				}
				i += o + 1
			}
			// Step backwards comparing bytes.
			for j := 1; j < n; j++ {
				if s[i-j] != b[last-j] {
					goto next
				}
			}
			return i - last
		next:
			fails++
			i++
			if (haveFastIndex && fails > bytealg.Cutover(i)) && i < len(s) ||
				(!haveFastIndex && fails >= 4+i>>4 && i < len(s)) {
				goto fallback
			}
		}

pkg text/scanner, const ScanComments = 256
pkg text/scanner, const ScanFloats = 16
pkg text/scanner, const ScanIdents = 4
pkg text/scanner, const ScanInts = 8
pkg text/scanner, const ScanRawStrings = 128
pkg text/scanner, const ScanStrings = 64
pkg text/scanner, const SkipComments = 512
pkg text/scanner, const String = -6
pkg text/tabwriter, const AlignRight = 4
pkg text/tabwriter, const Debug = 32

    SQLModel sabrá que algo declarado como `str` será una columna SQL de tipo `TEXT` (o `VARCHAR`, dependiendo de la base de datos).

### Crear un Engine { #create-an-engine }

Un `engine` de SQLModel (en el fondo, realmente es un `engine` de SQLAlchemy) es lo que **mantiene las conexiones** a la base de datos.

    把类型设置为 `int | None` ，SQLModel 就能知道该列在 SQL 数据库中应该是 `INTEGER` 类型，并且应该是 `NULLABLE` 。

* `Field(index=True)` 会告诉 SQLModel 应该为此列创建一个 **SQL 索引**，这样在读取按此列过滤的数据时，程序能在数据库中进行更快的查找。

    SQLModel 会知道声明为 `str` 的内容将是类型为 `TEXT` （或 `VARCHAR` ，具体取决于数据库）的 SQL 列。

### 创建引擎（Engine）

SQLModel 的引擎 `engine`（实际上它是一个 SQLAlchemy `engine` ）是用来与数据库**保持连接**的。

您只需构建**一个 `engine`**，来让您的所有代码连接到同一个数据库。