用SPARQL-更新查询将TTL上传到GraphDB时，无法处理带有变音符号的字符。

当使用SPARQL-Update查询将TTL上传到GraphDB时，遇到带有变音符号的字符无法处理的问题，可以使用Unicode转义序列来解决。以下是一个示例代码：

import org.eclipse.rdf4j.model.Model;
import org.eclipse.rdf4j.model.Resource;
import org.eclipse.rdf4j.model.Statement;
import org.eclipse.rdf4j.model.Value;
import org.eclipse.rdf4j.model.impl.LinkedHashModel;
import org.eclipse.rdf4j.model.impl.SimpleValueFactory;
import org.eclipse.rdf4j.model.vocabulary.RDF;
import org.eclipse.rdf4j.repository.Repository;
import org.eclipse.rdf4j.repository.RepositoryConnection;
import org.eclipse.rdf4j.repository.http.HTTPRepository;
import org.eclipse.rdf4j.rio.RDFFormat;
import org.eclipse.rdf4j.rio.Rio;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class GraphDBUpdateExample {

    public static void main(String[] args) {
        String repositoryUrl = "http://localhost:7200/repositories/my-repo";
        String username = "admin";
        String password = "password";

        // Load TTL file
        File ttlFile = new File("data.ttl");
        Model model = new LinkedHashModel();
        try (FileInputStream fis = new FileInputStream(ttlFile)) {
            Rio.parse(fis, "", RDFFormat.TURTLE, model);
        } catch (IOException e) {
            e.printStackTrace();
        }

        // Create a repository connection
        Repository repository = new HTTPRepository(repositoryUrl);
        RepositoryConnection connection = repository.getConnection();

        try {
            // Start a transaction
            connection.begin();

            // Iterate over the statements in the model and add them to the repository
            for (Statement statement : model) {
                Resource subject = statement.getSubject();
                Value object = statement.getObject();

                // Escape characters with diacritic marks
                String escapedSubject = escapeUnicode(subject.stringValue());
                String escapedObject = escapeUnicode(object.stringValue());

                // Create a new statement with escaped characters
                Statement escapedStatement = SimpleValueFactory.getInstance().createStatement(
                        SimpleValueFactory.getInstance().createIRI(escapedSubject),
                        statement.getPredicate(),
                        SimpleValueFactory.getInstance().createLiteral(escapedObject)
                );

                // Add the escaped statement to the repository
                connection.add(escapedStatement);
            }

            // Commit the transaction
            connection.commit();
        } finally {
            // Close the connection
            connection.close();
        }
    }

    // Escape Unicode characters with diacritic marks
    private static String escapeUnicode(String input) {
        StringBuilder builder = new StringBuilder();
        for (char c : input.toCharArray()) {
            if (Character.isLetterOrDigit(c) || Character.isWhitespace(c) || c == '-' || c == '_') {
                builder.append(c);
            } else {
                builder.append("\\u").append(String.format("%04x", (int) c));
            }
        }
        return builder.toString();
    }
}

上述代码首先加载TTL文件并解析为RDF模型。然后，通过创建一个带有转义字符的新语句来处理带有变音符号的字符。最后，将转义后的语句添加到GraphDB中。

在这个示例中，我们使用了RDF4J库来处理RDF数据和与GraphDB的连接。请确保将代码中的repositoryUrl，username和password替换为您自己的GraphDB存储库的URL，用户名和密码。

注意：转义字符的处理可能会导致RDF数据的语义变化，请根据具体情况进行调整。