与Google Cloud SQL的连接间歇性断开

Question

I am using a Google Cloud SQL using Java-SQL connector. The issue I am facing is that the connection to database drops unexpectedly. While Googling I came across this question and tried the solution suggested in the same question.

In your console click the project, on the left side click Storage > CloudSQL then click on your database name . You will see an 'Edit' button on top. Click that and scroll down to Activation Policy , change it to Always On and then click save .

But I'm still facing the same issue. Fortunately I have been keeping the logs on Google App Engine and I have attached the snapshot of the exception that occurred while connecting to database.

Gist of the code that I've posted below is used to establish connection to the database.

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.StringTokenizer;
import java.util.logging.Logger;

import com.google.appengine.api.utils.SystemProperty;
import static com.google.appengine.api.utils.SystemProperty.environment;
import static com.google.appengine.api.utils.SystemProperty.Environment.Value.Development;
import static com.google.appengine.api.utils.SystemProperty.Environment.Value.Production;

 Connection con=null;
SystemProperty.Environment.Value env = environment.value();
    if(env == Production)
    {
        System.out.println("Inside Production Phase");
        // Load the class that provides the new "jdbc:google:mysql://" prefix.
        Class.forName("com.mysql.jdbc.GoogleDriver");
        url = "jdbc:google:mysql://<my-project-id>:<cloud-sql-instance>/<database-name>?user=<user-name>&password=<database-password>&useUnicode=true&characterEncoding=UTF-8";
    }//if
    else if(env == Development)
    {
        System.out.println("Inside Development Phase");
        // This will load the MySQL driver, each DB has its own driver
        Class.forName("com.mysql.jdbc.Driver");
        url = "jdbc:mysql://127.0.0.1:3306/<database-name>?user=root";
    }//else if
    con = DriverManager.getConnection(url);

Is anyone facing the same problem, Please help.

Answer 1

Got a temporary fix, used following parameters while making connection to Google Cloud SQL

url = "jdbc:google:mysql://my-app:mysql2/project-name?user=root&password=password&autoReconnect=true&failOverReadOnly=false&maxReconnects=10";

Reference URL: https://dev.mysql.com/doc/connector-j/5.1/en/connector-j-reference-configuration-properties.html