[GitHub] hequn8128 commented on a change in pull request #6790: [FLINK-10487] fix invalid Flink SQL example and add runnable SQL example for Java API

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hequn8128 commented on a change in pull request #6790: [FLINK-10487] fix invalid Flink SQL example and add runnable SQL example for Java API
URL: https://github.com/apache/flink/pull/6790#discussion_r222518000
 
 

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 File path: flink-examples/flink-examples-table/src/main/java/org/apache/flink/table/examples/java/StreamSQLExample.java
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 @@ -0,0 +1,103 @@
+/*
+ * 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.table.examples.java;
+
+import org.apache.flink.streaming.api.datastream.DataStream;
+import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
+import org.apache.flink.table.api.Table;
+import org.apache.flink.table.api.TableEnvironment;
+import org.apache.flink.table.api.java.StreamTableEnvironment;
+
+import java.util.Arrays;
+
+/**
+ * Simple example for demonstrating the use of SQL on a Stream Table in Java.
+ *
+ * <p>This example shows how to:
+ *  - Convert DataStreams to Tables
+ *  - Register a Table under a name
+ *  - Run a StreamSQL query on the registered Table
+ *
+ */
+public class StreamSQLExample {
+
+	// *************************************************************************
+	//     PROGRAM
+	// *************************************************************************
+
+	public static void main(String[] args) throws Exception {
+
+		// set up execution environment
+		StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
+		StreamTableEnvironment tEnv = TableEnvironment.getTableEnvironment(env);
+
+		DataStream<Order> orderA = env.fromCollection(Arrays.asList(
+			new Order(1L, "beer", 3),
+			new Order(1L, "diaper", 4),
+			new Order(3L, "rubber", 2)));
+
+		DataStream<Order> orderB = env.fromCollection(Arrays.asList(
+			new Order(2L, "pen", 3),
+			new Order(2L, "rubber", 3),
+			new Order(4L, "beer", 1)));
+
+		// register the DataSet as table "WordCount"
+		Table tableA = tEnv.fromDataStream(orderA, "user, product, amount");
+		tEnv.registerDataStream("OrderB", orderB, "user, product, amount");
+
+		// run a SQL query on the Table and retrieve the result as a new Table
 
 Review comment:
   Change to "union the two tables" making it consistent to the comments in scala？

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