Construisez ensuite la valeur par défaut de votre paramètre avec `Query`, en choisissant 50 comme `max_length` :

{* ../../docs_src/query_params_str_validations/tutorial002.py hl[9] *}

Comme nous devons remplacer la valeur par défaut `None` dans la fonction par `Query()`, nous pouvons maintenant définir la valeur par défaut avec le paramètre `Query(default=None)`, il sert le même objectif qui est de définir cette valeur par défaut.

Donc :

import org.jspecify.annotations.Nullable;

/**
 * A {@link Closeable} that collects {@code Closeable} resources and closes them all when it is
 * {@linkplain #close closed}. This was intended to approximately emulate the behavior of Java 7's
 * <a href="http://docs.oracle.com/javase/tutorial/essential/exceptions/tryResourceClose.html"
 * >try-with-resources</a> statement in JDK6-compatible code. Code using this should be

                    // we're going to parse this back in as XML so we need to escape XML markup
                    value = value.toString()
                            .replace("&", "&")
                            .replace("<", "&lt;")
                            .replace(">", "&gt;");
                    return value;
                }
                return null;
            }
        });

        try {

      // expected
    }

    val logs = ShadowLog.getLogsForTag(AndroidPlatform.Tag)
    assertThat(logs.map { it.type }).containsOnly(Log.INFO)
    assertThat(
      logs.map {
        it.msg.replace(
          "\\d+".toRegex(),
          "",
        )
      },
    ).containsExactly(
      "--> GET http://google.com/robots.txt",

# FastAPI全栈模板

模板通常带有特定的设置，而且被设计为灵活和可定制的。这允许您根据项目的需求修改和调整它们，使它们成为一个很好的起点。🏁

您可以使用此模板开始，因为它包含了许多已经为您完成的初始设置、安全性、数据库和一些API端点。

代码仓： <a href="https://github.com/fastapi/full-stack-fastapi-template" class="external-link" target="_blank">Full Stack FastAPI Template</a>

## FastAPI全栈模板 - 技术栈和特性

- ⚡ [**FastAPI**](https://fastapi.tiangolo.com) 用于Python后端API.
    - 🧰 [SQLModel](https://sqlmodel.tiangolo.com) 用于Python和SQL数据库的集成（ORM）。

            try {
                if (fileString != null && !fileString.isEmpty()) {
                    fileString = interpolator.interpolate(fileString, "").replace("\\", "/");
                    File file = new File(fileString);
                    return file.exists();
                }

                // check if the file is missing, if it is then the profile will be active

func (db *DB) AutoMigrate(dst ...interface{}) error {
	return db.Migrator().AutoMigrate(dst...)
}

// ViewOption view option
type ViewOption struct {
	Replace     bool   // If true, exec `CREATE`. If false, exec `CREATE OR REPLACE`
	CheckOption string // optional. e.g. `WITH [ CASCADED | LOCAL ] CHECK OPTION`
	Query       *DB    // required subquery.
}

// ColumnType column type interface

          <velocityBasedir>${project.basedir}/../../src/mdo</velocityBasedir>
          <models>
            <model>src/main/mdo/maven.mdo</model>
          </models>
          <templates>
            <template>model.vm</template>
          </templates>
          <params>
            <param>packageModelV4=org.apache.maven.api.model</param>
            <param>isMavenModel=true</param>
            <param>locationTracking=true</param>

func (r *Record) WriteJSON(writer io.Writer) error {
	return json.NewEncoder(writer).Encode(r.KVS)
}

// Replace the underlying buffer of json data.
func (r *Record) Replace(k any) error {
	v, ok := k.(jstream.KVS)
	if !ok {
		return fmt.Errorf("cannot replace internal data in json record with type %T", k)
	}
	r.KVS = v
	return nil
}

// NewRecord - creates new empty JSON record.

	if err != nil {
		return err
	}
	if n != len(b) {
		return io.ErrShortWrite
	}
	return nil
}

// Replace the underlying buffer of json data.
func (r *Record) Replace(k any) error {
	v, ok := k.(simdjson.Object)
	if !ok {
		return fmt.Errorf("cannot replace internal data in simd json record with type %T", k)
	}
	r.object = v
	return nil
}

// NewRecord - creates new empty JSON record.