/// tip | Dica

Vamos discutir o `@lru_cache` em breve.

Por enquanto, você pode assumir que `get_settings()` é uma função normal.

///

E então podemos exigi-la na *função de operação de rota* como dependência e usá-la onde for necessário.

{* ../../docs_src/settings/app02_an_py39/main.py hl[17,19:21] *}

### Configurações e testes { #settings-and-testing }

pkg database/sql, method (*Conn) QueryContext(context.Context, string, ...interface{}) (*Rows, error)
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{}

	rows, _ := DB.Table("users").Where("name = ?", "select_with_variables").Select("? as fake", gorm.Expr("name")).Rows()

	if !rows.Next() {
		t.Errorf("Should have returned at least one row")
	} else {
		columns, _ := rows.Columns()
		AssertEqual(t, columns, []string{"fake"})
	}

	rows.Close()
}

func TestSelectWithArrayInput(t *testing.T) {

   *
   * <p>If the function throws an exception, that exception is used as the result of the derived
   * {@code ClosingFuture}.
   *
   * <p>Example usage:
   *
   * {@snippet :
   * ClosingFuture<List<Row>> rowsFuture =
   *     queryFuture.transform((closer, result) -> result.getRows(), executor);
   * }
   *
   * <p>When selecting an executor, note that {@code directExecutor} is dangerous in some cases. See

        this.maxRetryCount = maxRetryCount;
    }

    /**
     * Sets the default number of rows to process in a single batch.
     *
     * @param defaultRowSize the default row size
     */
    public void setDefaultRowSize(final int defaultRowSize) {
        this.defaultRowSize = defaultRowSize;
    }

    /**
     * Sets the interval between requests in milliseconds.
     *

* **Suporte ao editor**.
* **Verificações de tipo**.

... e o **FastAPI** usa as mesmas declarações para:

* **Definir requisitos**: dos parâmetros de rota, parâmetros da consulta, cabeçalhos, corpos, dependências, etc.
* **Converter dados**: da solicitação para o tipo necessário.
* **Validar dados**: provenientes de cada solicitação:

   * this input {@code Future} fails, the returned {@code Future} fails with the same exception (and
   * the function is not invoked). Example usage:
   *
   * {@snippet :
   * ListenableFuture<List<Row>> rowsFuture =
   *     queryFuture.transform(QueryResult::getRows, executor);
   * }
   *
   * <p>When selecting an executor, note that {@code directExecutor} is dangerous in some cases. See

      synchronized (mutex) {
        return delegate().remove(rowKey, columnKey);
      }
    }

    @Override
    public Map<C, V> row(@ParametricNullness R rowKey) {
      synchronized (mutex) {
        return map(delegate().row(rowKey), mutex);
      }
    }

    @Override
    public Map<R, V> column(@ParametricNullness C columnKey) {
      synchronized (mutex) {

      synchronized (mutex) {
        return delegate().remove(rowKey, columnKey);
      }
    }

    @Override
    public Map<C, V> row(@ParametricNullness R rowKey) {
      synchronized (mutex) {
        return map(delegate().row(rowKey), mutex);
      }
    }

    @Override
    public Map<R, V> column(@ParametricNullness C columnKey) {
      synchronized (mutex) {

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