loserwang1024 commented on code in PR #3319: URL: https://github.com/apache/flink-cdc/pull/3319#discussion_r1599417206
########## flink-cdc-connect/flink-cdc-source-connectors/flink-cdc-base/src/main/java/org/apache/flink/cdc/connectors/base/source/utils/JdbcChunkUtil.java: ########## @@ -0,0 +1,132 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.flink.cdc.connectors.base.source.utils; + +import org.apache.flink.table.api.ValidationException; + +import io.debezium.jdbc.JdbcConnection; +import io.debezium.relational.Column; +import io.debezium.relational.Table; + +import javax.annotation.Nullable; + +import java.sql.SQLException; +import java.util.List; +import java.util.Optional; +import java.util.stream.Collectors; + +import static org.apache.flink.cdc.connectors.base.utils.SourceRecordUtils.rowToArray; + +/** Utilities to split chunks of table. */ +public class JdbcChunkUtil { + + /** + * Query the maximum and minimum value of the column in the table. e.g. query string <code> + * SELECT MIN(%s) FROM %s WHERE %s > ?</code> + * + * @param jdbc JDBC connection. + * @param tableId table identity. + * @param columnName column name. + * @return maximum and minimum value. + */ + public static Object[] queryMinMax(JdbcConnection jdbc, String tableId, String columnName) + throws SQLException { + final String minMaxQuery = + String.format("SELECT MIN(%s), MAX(%s) FROM %s", columnName, columnName, tableId); Review Comment: Thanks, it looks better! -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
