tx = db.getInstance()

	switch v := query.(type) {
	case []string:
		tx.Statement.Selects = v

		for _, arg := range args {
			switch arg := arg.(type) {
			case string:
				tx.Statement.Selects = append(tx.Statement.Selects, arg)
			case []string:
				tx.Statement.Selects = append(tx.Statement.Selects, arg...)
			default:

And you can also declare body parameters as optional, by setting the default to `None`:

{* ../../docs_src/body_multiple_params/tutorial001_an_py310.py hl[18:20] *}

/// note

Notice that, in this case, the `item` that would be taken from the body is optional. As it has a `None` default value.

///

## Multiple body parameters { #multiple-body-parameters }

            }
        } else {
            type = parseStorageType(typeStr);
        }

        switch (type) {
        case GCS:
            return new GcsStorageClient(fessConfig.getStorageProjectId(), bucket, endpoint, fessConfig.getStorageCredentialsPath());
        case S3:
        case S3_COMPAT:
        default:
            return new S3StorageClient(endpoint, accessKey, secretKey, bucket, fessConfig.getStorageRegion());

	go func() {
		saveTicker := time.NewTicker(10 * time.Second)
		defer saveTicker.Stop()
		quit := false
		after := time.Minute
		for !quit {
			select {
			case <-saveTicker.C:
			case <-ctx.Done():
				quit = true
			case <-saverQuitCh:
				quit = true
			}

			if quit {
				// save immediately if we are quitting
				after = 0
			}

In that case, they will be applied to all the *path operations* in the application:

{* ../../docs_src/dependencies/tutorial012_an_py39.py hl[17] *}


And all the ideas in the section about [adding `dependencies` to the *path operation decorators*](dependencies-in-path-operation-decorators.md){.internal-link target=_blank} still apply, but in this case, to all of the *path operations* in the app.

     */
    public byte[] fromObjectToBinary(final Object obj) {
        final String serializer = getSerializerType();
        return switch (serializer) {
        case KRYO -> serializeWithKryo(obj);
        case JAVABIN -> SerializeUtil.fromObjectToBinary(obj);
        default -> throw new IllegalArgumentException("Unexpected value: " + serializer);
        };
    }

    /**

                switch (bufferType) {
                case PacConstants.LOGON_INFO:
                    // PAC Credential Information
                    if (this.logonInfo == null) {
                        this.logonInfo = new PacLogonInfo(bufferData);
                    }
                    break;
                case PacConstants.CREDENTIAL_TYPE:
                    // PAC Credential Type

## Optional parameters { #optional-parameters }

The same way, you can declare optional query parameters, by setting their default to `None`:

{* ../../docs_src/query_params/tutorial002_py310.py hl[7] *}

In this case, the function parameter `q` will be optional, and will be `None` by default.

/// check

            switch (xObj.type()) {
            case BOOLEAN:
                final Boolean b = (Boolean) xObj.value();
                return new String[] { b.toString() };
            case NUMBER:
                final Number d = (Number) xObj.value();
                return new String[] { d.toString() };
            case STRING:
                final String str = (String) xObj.value();

	case DeleteType:
		return time.Unix(0, j.DeleteMarker.ModTime)
	case LegacyType:
		return j.ObjectV1.Stat.ModTime
	}
	return time.Time{}
}

// getVersionID will return the versionID of the underlying version.
func (j xlMetaV2Version) getVersionID() [16]byte {
	switch j.Type {
	case ObjectType:
		return j.ObjectV2.VersionID
	case DeleteType:
		return j.DeleteMarker.VersionID
	case LegacyType: