无法通过Java Eclipse连接到Google Cloud SQL

Question

我无法使用我的实例Google Cloud SQL数据库从Eclipse连接到我的数据库。 我成功通过mysql命令行访问数据库，但没有成功。

我的代码：

String instanceConnectionName = "****";
String databaseName = "****";
String username = "***";
String password = "***";

 String jdbcUrl = String.format(
            "jdbc:mysql://google/%s?cloudSqlInstance=%s&"
        + "socketFactory=com.google.cloud.sql.mysql.SocketFactory",
            databaseName,
            instanceConnectionName);         
 Connection connection = DriverManager.getConnection(jdbcUrl, username, password);

我得到的错误：

jdbc:mysql://google/****?cloudSqlInstance=****e&socketFactory=com.google.cloud.sql.mysql.SocketFactory

May 03, 2017 10:53:07 AM com.google.cloud.sql.mysql.SocketFactory connect
INFO: Connecting to Cloud SQL instance [****].
May 03, 2017 10:53:07 AM com.google.cloud.sql.mysql.SslSocketFactory getInstance
INFO: First Cloud SQL connection, generating RSA key pair.
Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.Util.getInstance(Util.java:387)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:917)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2332)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2085)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:795)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:327)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at neviTracker.program.ProgramConnections.main(ProgramConnections.java:27)
Caused by: java.lang.RuntimeException: Unable to obtain credentials to communicate with the Cloud SQL API
at com.google.cloud.sql.mysql.SslSocketFactory$ApplicationDefaultCredentialFactory.create(SslSocketFactory.java:545)
at com.google.cloud.sql.mysql.SslSocketFactory.getInstance(SslSocketFactory.java:138)
at com.google.cloud.sql.mysql.SocketFactory.connect(SocketFactory.java:47)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:298)
at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2253)
at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2286)
... 13 more

Caused by: java.io.IOException: The Application Default Credentials are not available. They are available if running on Google App Engine, Google Compute Engine, or Google Cloud Shell. Otherwise, the environment variable GOOGLE_APPLICATION_CREDENTIALS must be defined pointing to a file defining the credentials. See https://developers.google.com/accounts/docs/application-default-credentials for more information.
at com.google.api.client.googleapis.auth.oauth2.DefaultCredentialProvider.getDefaultCredential(DefaultCredentialProvider.java:98)
at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.getApplicationDefault(GoogleCredential.java:213)
at com.google.api.client.googleapis.auth.oauth2.GoogleCredential.getApplicationDefault(GoogleCredential.java:191)
at com.google.cloud.sql.mysql.SslSocketFactory$ApplicationDefaultCredentialFactory.create(SslSocketFactory.java:543)
... 18 more

Answer 1

您收到一条错误消息，提示未设置环境变量GOOGLE_APPLICATION_CREDENTIALS 。 请在根文件夹中创建一个.credentials文件，然后在其中添加您的凭据详细信息。

请参考此链接https://developers.google.com/identity/protocols/application-default-credentials

Answer 2

应用程序默认凭据不可用。 如果它们在Google App Engine，Google Compute Engine或Google Cloud Shell上运行，则可用。 否则，必须定义环境变量GOOGLE_APPLICATION_CREDENTIALS，指向指向定义凭据的文件。 有关更多信息，请参见https://developers.google.com/accounts/docs/application-default-credentials 。

您需要凭据才能访问Google Cloud sql。 您可以从这里创建

创建凭证后，请创建密钥文件并将其指向您的bash_profile（请阅读块引用以获取更多信息）。 那么它应该工作

或者，您可以使用CLOUD SQL PROXY不适用于环境变量，请按照此链接中的步骤进行操作，如果有任何模糊之处，请询问。 https://cloud.google.com/sql/docs/mysql/connect-admin-proxy

希望这可以帮助。