Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/3712#discussion_r132141735
--- Diff:
flink-connectors/flink-jdbc/src/main/java/org/apache/flink/api/java/io/jdbc/JDBCAppendTableSink.java
---
@@ -0,0 +1,97 @@
+/*
+ * 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.api.java.io.jdbc;
+
+import org.apache.flink.annotation.VisibleForTesting;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.java.DataSet;
+import org.apache.flink.api.java.typeutils.RowTypeInfo;
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.table.sinks.AppendStreamTableSink;
+import org.apache.flink.table.sinks.BatchTableSink;
+import org.apache.flink.table.sinks.TableSink;
+import org.apache.flink.types.Row;
+import org.apache.flink.util.Preconditions;
+
+/**
+ * An at-least-once Table sink for JDBC.
+ *
+ * <p>The mechanisms of Flink guarantees delivering messages at-least-once
to this sink.
+ * However, one common use case is to run idempotent queries (e.g.,
<code>REPLACE</code> or
+ * <code>INSERT OVERWRITE</code>) to upsert into the database and achieve
exactly-once semantic.</p>
+ */
+public class JDBCAppendTableSink implements AppendStreamTableSink<Row>,
BatchTableSink<Row> {
+ private final JDBCSinkFunction sink;
+
+ private String[] fieldNames;
+ private TypeInformation[] fieldTypes;
+
+ JDBCAppendTableSink(JDBCOutputFormat outputFormat) {
+ this.sink = new JDBCSinkFunction(outputFormat);
+ }
+
+ public static JDBCAppendTableSinkBuilder builder() {
+ return new JDBCAppendTableSinkBuilder();
+ }
+
+ @Override
+ public void emitDataStream(DataStream<Row> dataStream) {
+ dataStream.addSink(sink);
+ }
+
+ @Override
+ public void emitDataSet(DataSet<Row> dataSet) {
+ dataSet.output(sink.outputFormat);
+ }
+
+ @Override
+ public TypeInformation<Row> getOutputType() {
+ return new RowTypeInfo(fieldTypes, fieldNames);
+ }
+
+ @Override
+ public String[] getFieldNames() {
+ return fieldNames;
+ }
+
+ @Override
+ public TypeInformation<?>[] getFieldTypes() {
+ return fieldTypes;
+ }
+
+ @Override
+ public TableSink<Row> configure(String[] fieldNames,
TypeInformation<?>[] fieldTypes) {
+ int[] types = sink.outputFormat.getTypesArray();
+ Preconditions.checkArgument(fieldTypes.length == types.length);
--- End diff --
Give a detailed error message like: `"Schema of output table incompatible
with JDBCAppendTableSink: expected [type1, type2, type3, ...], actual [type1,
type2]"`
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