# Bases de Datos SQL (Relacionales) { #sql-relational-databases }

**FastAPI** no requiere que uses una base de datos SQL (relacional). Pero puedes utilizar **cualquier base de datos** que desees.

Aquí veremos un ejemplo usando [SQLModel](https://sqlmodel.tiangolo.com/).

# Bases de données SQL (relationnelles) { #sql-relational-databases }

**FastAPI** ne vous oblige pas à utiliser une base de données SQL (relationnelle). Mais vous pouvez utiliser **n'importe quelle base de données** que vous voulez.

Ici, nous allons voir un exemple utilisant [SQLModel](https://sqlmodel.tiangolo.com/).

    String getSource();

    /**
     * Gets the one-based index of the line containing the problem. The line number should refer to some text file that
     * is given by {@link #getSource()}.
     *
     * @return The one-based index of the line containing the problem or a non-positive value if unknown.
     */
    int getLineNumber();

    /**

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.annotations.GwtCompatible;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.jspecify.annotations.Nullable;

/**
 * Simple helper class to build a "sparse" array of objects based on the indexes that were added to

      /*
       * The test calls directly into the "ACL-based filesystem" code, which isn't available under
       * old versions of Android. Since Android doesn't use that code path, anyway, there's no need
       * to test it.
       */
      return;
    }

    /*
     * Only under Windows (or hypothetically when running with some other non-POSIX, ACL-based

  - 🧰 [SQLModel](https://sqlmodel.tiangolo.com) pour les interactions avec la base de données SQL en Python (ORM).
  - 🔍 [Pydantic](https://docs.pydantic.dev), utilisé par FastAPI, pour la validation des données et la gestion des paramètres.
  - 💾 [PostgreSQL](https://www.postgresql.org) comme base de données SQL.
- 🚀 [React](https://react.dev) pour le frontend.

     * during model building, based on the POM schema version.
     * <p>
     * The validation levels are cumulative, with higher versions including all validations
     * from lower versions plus additional checks specific to that version.
     */
    enum Version {
        /**
         * Base validation level that applies to all POM versions.

 */
public abstract class FessSearchAction extends FessBaseAction {

    /**
     * Default constructor.
     */
    public FessSearchAction() {
        super();
    }

    /** The field name used for label-based search filtering. */
    protected static final String LABEL_FIELD = "label";

    /** Helper for performing search operations and managing search requests. */
    @Resource
    protected SearchHelper searchHelper;

    stream.defaultReadObject();
    keyTypeOrObjectUnderJ2cl = (Class<K>) requireNonNull(stream.readObject());
    /*
     * TODO: cpovirk - Pre-size the HashMap based on the number of enum values? (But *not* based on
     * the number of entries in the map, as that makes it easy for hostile inputs to trigger lots of
     * allocation—not that any program should be deserializing hostile inputs to begin with!)
     */

 * the License.
 */

package com.google.common.base;

import com.google.common.annotations.GwtCompatible;
import java.util.Objects;
import org.jspecify.annotations.Nullable;

/**
 * Determines an output value based on an input value; a pre-Java-8 version of {@link
 * java.util.function.Function java.util.function.Function}.
 *