hologres-connector-flink-base/src/main/java/com/alibaba/ververica/connectors/hologres/utils/JDBCUtils.java hologres-connector-kafka/src/main/java/com/alibaba/hologres/kafka/utils/JDBCUtils.java hologres-connector-flink-base/src/main/java/com/alibaba/ververica/connectors/hologres/jdbc/copy/HologresJDBCCopyWriter.java hologres-connector-kafka/src/main/java/com/alibaba/hologres/kafka/sink/writer/HoloCopyWriter.java