Add cloudsql gen1 sample for app engine

appengine/cloudsql/README.md

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+# Cloud SQL sample for Google App Enginge
+This sample demonstrates how to use [Cloud SQL](https://cloud.google.com/sql/) on Google App Engine
+## Setup
+Before you can run or deploy the sample, you will need to create a [Cloud SQL instance](https://cloud.google.com/sql/docs/create-instance)
+1. Create a new user and database for the application. The easiest way to do this is via the [Google Developers Console](https://console.developers.google.com/project/_/sql/instances/example-instance2/access-control/users). Alternatively, you can use MySQL tools such as the command line client or workbench.
+## Running locally
+1. You will need to be running a local instance of MySQL.
+1. Update the connection string in ``appengine-web.xml`` with your local MySQL instance values.
+    $ mvn clean appengine:devserver
+## Deploying
+1. Update the connection string in ``appengine-web.xml`` with your Cloud SQL instance values.
+    $ mvn clean appengine:update

appengine/cloudsql/pom.xml

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+<!--
+ Copyright 2016 Google Inc. All Rights Reserved.
+
+ Licensed 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.
+-->
+<project>
+  <modelVersion>4.0.0</modelVersion>
+  <packaging>war</packaging>
+  <version>1.0-SNAPSHOT</version>
+  <groupId>com.example.appengine</groupId>
+  <artifactId>appengine-cloudsql</artifactId>
+
+  <parent>
+    <artifactId>doc-samples</artifactId>
+    <groupId>com.google.cloud</groupId>
+    <version>1.0.0</version>
+    <relativePath>../..</relativePath>
+  </parent>
+
+  <dependencies>
+    <dependency>
+      <groupId>com.google.cloud.sql</groupId>
+      <artifactId>mysql-socket-factory</artifactId>
+      <version>1.0.0-beta1</version>
+    </dependency>
+    <dependency>
+      <groupId>javax.servlet</groupId>
+      <artifactId>javax.servlet-api</artifactId>
+      <version>3.1.0</version>
+      <type>jar</type>
+      <scope>provided</scope>
+    </dependency>
+    <!-- [START dependencies] -->
+    <dependency>
+      <groupId>mysql</groupId>
+      <artifactId>mysql-connector-java</artifactId>
+      <version>5.1.38</version>
+    </dependency>
+    <!-- Parent POM defines ${appengine.sdk.version} (updates frequently). -->
+    <dependency>
+      <groupId>com.google.appengine</groupId>
+      <artifactId>appengine-api-1.0-sdk</artifactId>
+    </dependency>
+    <!-- [END dependencies] -->
+  </dependencies>
+  <build>
+    <!-- for hot reload of the web application -->
+    <outputDirectory>${project.build.directory}/${project.build.finalName}/WEB-INF/classes</outputDirectory>
+    <plugins>
+      <plugin>
+        <groupId>com.google.appengine</groupId>
+        <artifactId>appengine-maven-plugin</artifactId>
+        <version>${appengine.sdk.version}</version>
+      </plugin>
+    </plugins>
+  </build>
+</project>

appengine/cloudsql/src/main/java/com/example/appengine/cloudsql/CloudSqlServlet.java

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+/**
+ * Copyright 2016 Google Inc. All Rights Reserved.
+ *
+ * Licensed 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 com.example.appengine.cloudsql;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Timestamp;
+import java.util.Date;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+// [START example]
+@SuppressWarnings("serial")
+public class CloudSqlServlet extends HttpServlet {
+
+  @Override
+  public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException,
+      ServletException {
+    String path = req.getRequestURI();
+    if (path.startsWith("/favicon.ico")) {
+      return; // ignore the request for favicon.ico
+    }
+    // store only the first two octets of a users ip address
+    String userIp = req.getRemoteAddr();
+    InetAddress address = InetAddress.getByName(userIp);
+    if (address instanceof Inet6Address) {
+      // nest indexOf calls to find the second occurrence of a character in a string
+      // an alternative is to use Apache Commons Lang: StringUtils.ordinalIndexOf()
+      userIp = userIp.substring(0, userIp.indexOf(":", userIp.indexOf(":") + 1)) + ":*:*:*:*:*:*";
+    } else if (address instanceof Inet4Address) {
+      userIp = userIp.substring(0, userIp.indexOf(".", userIp.indexOf(".") + 1)) + ".*.*";
+    }
+
+    final String createTableSql = "CREATE TABLE IF NOT EXISTS visits ( visit_id INT NOT NULL "
+        + "AUTO_INCREMENT, user_ip VARCHAR(46) NOT NULL, timestamp DATETIME NOT NULL, "
+        + "PRIMARY KEY (visit_id) )";
+    final String createVisitSql = "INSERT INTO visits (user_ip, timestamp) VALUES (?, ?)";
+    final String selectSql = "SELECT user_ip, timestamp FROM visits ORDER BY timestamp DESC "
+        + "LIMIT 10";
+    PrintWriter out = resp.getWriter();
+    resp.setContentType("text/plain");
+    String url;
+    if (System
+        .getProperty("com.google.appengine.runtime.version").startsWith("Google App Engine/")) {
+      // Check the System properties to determine if we are running on appengine or not
+      // Google App Engine sets a few system properties that will reliably be present on a remote
+      // instance.
+      url = System.getProperty("ae-cloudsql.cloudsql-database-url");
+      try {
+        // Load the class that provides the new "jdbc:google:mysql://" prefix.
+        Class.forName("com.mysql.jdbc.GoogleDriver");
+      } catch (ClassNotFoundException e) {
+        throw new ServletException("Error loading Google JDBC Driver", e);
+      }
+    } else {
+      // Set the url with the local MySQL database connection url when running locally
+      url = System.getProperty("ae-cloudsql.local-database-url");
+    }
+    try (Connection conn = DriverManager.getConnection(url);
+        PreparedStatement statementCreateVisit = conn.prepareStatement(createVisitSql)) {
+      conn.createStatement().executeUpdate(createTableSql);
+      statementCreateVisit.setString(1, userIp);
+      statementCreateVisit.setTimestamp(2, new Timestamp(new Date().getTime()));
+      statementCreateVisit.executeUpdate();
+
+      try (ResultSet rs = conn.prepareStatement(selectSql).executeQuery()) {
+        out.print("Last 10 visits:\n");
+        while (rs.next()) {
+          String savedIp = rs.getString("user_ip");
+          String timeStamp = rs.getString("timestamp");
+          out.print("Time: " + timeStamp + " Addr: " + savedIp + "\n");
+        }
+      }
+    } catch (SQLException e) {
+      throw new ServletException("SQL error", e);
+    }
+  }
+}
+// [END example]

appengine/cloudsql/src/main/webapp/WEB-INF/appengine-web.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- [START_EXCLUDE] -->
+<!--
+  Copyright 2016 Google Inc. All Rights Reserved.
+  Licensed 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.
+-->
+<!-- [END_EXCLUDE] -->
+<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
+  <application>YOUR-PROJECT-ID</application>
+  <version>YOUR-VERSION-ID</version>
+  <threadsafe>true</threadsafe>
+  <use-google-connector-j>true</use-google-connector-j>
+  <system-properties>
+    <property name="ae-cloudsql.cloudsql-database-url" value="jdbc:google:mysql://YOUR-PROJECT-NAME:YOUR-CLOUDSQL-INSTANCE-NAME/DATABASE-NAME?user=USERNAME&amp;password=PASSWORD" />
+    <property name="ae-cloudsql.local-database-url" value="jdbc:mysql://localhost/DATABASE-NAME?user=USERNAME&amp;PASSWORD=password&amp;useSSL=false" />
+  </system-properties>
+</appengine-web-app>

appengine/cloudsql/src/main/webapp/WEB-INF/web.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- [START_EXCLUDE] -->
+<!--
+  Copyright 2016 Google Inc. All Rights Reserved.
+  Licensed 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.
+-->
+<!-- [END_EXCLUDE] -->
+<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee"
+  xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
+  version="2.5">
+  <servlet>
+    <servlet-name>cloudsql</servlet-name>
+    <servlet-class>com.example.appengine.cloudsql.CloudSqlServlet</servlet-class>
+  </servlet>
+  <servlet-mapping>
+    <servlet-name>cloudsql</servlet-name>
+    <url-pattern>/</url-pattern>
+  </servlet-mapping>
+</web-app>

appengine/helloworld/src/main/webapp/WEB-INF/appengine-web.xml

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 <?xml version="1.0" encoding="utf-8"?>
+<!-- [START_EXCLUDE] -->
+<!--
+  Copyright 2016 Google Inc. All Rights Reserved.
+  Licensed 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.
+-->
+<!-- [END_EXCLUDE] -->
 <appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
   <application>YOUR-PROJECT-ID</application>
   <version>YOUR-VERSION-ID</version>