flink-connector-jdbc扩展国产达梦数据库

下载flink-connector-jdbc源码

git clone https://github.com/apache/flink-connector-jdbc.git

增加达梦数据库支持

1. 在org.apache.flink.connector.jdbc.databases创建dm包

2. 在dm.dialect中创建DmDialect、DmDialectFactory、DmRowConverter

DmDialect

/*
 * 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.connector.jdbc.databases.dm.dialect;

import org.apache.flink.annotation.Internal;
import org.apache.flink.connector.jdbc.converter.JdbcRowConverter;
import org.apache.flink.connector.jdbc.dialect.AbstractDialect;
import org.apache.flink.table.types.logical.LogicalTypeRoot;
import org.apache.flink.table.types.logical.RowType;

import java.util.Arrays;
import java.util.EnumSet;
import java.util.Optional;
import java.util.Set;
import java.util.stream.Collectors;

/** JDBC dialect for Dm. */
@Internal
public class DmDialect extends AbstractDialect {
   

    private static final long serialVersionUID = 1L;

    // Define MAX/MIN precision of TIMESTAMP type according to Dm docs:
    // https://www.techonthenet.com/dm/datatypes.php
    private static final int MAX_TIMESTAMP_PRECISION = 9;
    private static final int MIN_TIMESTAMP_PRECISION = 1;

    // Define MAX/MIN precision of DECIMAL type according to Dm docs:
    // https://www.techonthenet.com/dm/datatypes.php
    private static final int MAX_DECIMAL_PRECISION = 38;
    private static final int MIN_DECIMAL_PRECISION = 1;

    @Override
    public JdbcRowConverter getRowConverter(RowType rowType) {
   
        return new DmRowConverter(rowType);
    }

    @Override
    public String getLimitClause(long limit) {
   
        return "FETCH FIRST " + limit + " ROWS ONLY";
    }

    @Override
    public Optional<String> defaultDriverName() {
   
        return Optional.of("dm.jdbc.dri