从Google App Engine Java连接到本地MySQL实例时出错。
我已经使用gradle构建插件创建了一个GoogleAppEngineJava项目。应用程序引擎版本为1.9.34。为了开发和测试，我正在尝试将本地dev服务器连接到本地mysql数据库。我正在尝试连接本地数据库，如下所示：从Google App Engine Java连接到本地MySQL实例时出错。,java,mysql,google-app-engine,Java,Mysql,Google App Engine,我已经使用gradle构建插件创建了一个GoogleAppEngineJava项目。应用程序引擎版本为1.9.34。为了开发和测试，我正在尝试将本地dev服务器连接到本地mysql数据库。我正在尝试连接本地数据库，如下所示： try { Class.forName("com.mysql.jdbc.Driver"); url = "jdbc:mysql://localhost/testDB?user=root"; } catch (ClassNotFou
try {
Class.forName("com.mysql.jdbc.Driver");
url = "jdbc:mysql://localhost/testDB?user=root";
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
Connection conn = null;
try {
conn = (Connection) DriverManager.getConnection(url, "root", "admin123$");
String statement = "INSERT INTO entries (firstName, lastName, phoneNo, email) VALUES( ? , ? , ?, ?)";
java.sql.PreparedStatement stmt = conn.prepareStatement(statement);
stmt.setString(1, newContact.getFirstName());
stmt.setString(2, newContact.getLastName());
stmt.setString(3, newContact.getPhoneNumber());
stmt.setString(4, newContact.getEmail());
int success = 2;
success = stmt.executeUpdate();
if (success == 1) {
System.out.println("Insert Successful");
} else if (success == 0) {
System.out.println("Insert error");
}
} catch (SQLException e) {
e.printStackTrace();
}
compile 'mysql:mysql-connector-java:5.1.16'
<?xml version="1.0" encoding="utf-8"?>
<appengine-web-app xmlns="http://appengine.google.com/ns/1.0">
...
<use-google-connector-j>true</use-google-connector-j>
</appengine-web-app>
if (SystemProperty.environment.value() == SystemProperty.Environment.Value.Production) {
// Load the class that provides the new "jdbc:google:mysql://" prefix.
Class.forName("com.mysql.jdbc.GoogleDriver");
url = "jdbc:google:mysql://your-project-id:your-instance-name/your-database?user=root";
} else {
// Local MySQL instance to use during development.
Class.forName("com.mysql.jdbc.Driver");
url = "jdbc:mysql://127.0.0.1:3306/your-database?user=root";
// Alternatively, connect to a Google Cloud SQL instance using:
// jdbc:mysql://ip-address-of-google-cloud-sql-instance:3306/your-database?user=root
}