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How to check the default port number for mysql connection? Connection not working! jdbc connection


How to check the default port number for mysql connection? Connection not working! jdbc connection

By : HansValentino
Date : November 19 2020, 12:41 AM
this will help I am trying to connect with database using jdbc in java file. It is not connecting at all and giving me the error constantly "Something went wrong"; I guess it is because of the port number because all other data such as username, password and other code seems correct. , You can access those settings via
code :
mysql> show variables;


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JDBC MySql connection pooling practices to avoid exhausted connection pool

JDBC MySql connection pooling practices to avoid exhausted connection pool


By : user1785057
Date : March 29 2020, 07:55 AM
it helps some times The exception indicates a typical case of application code which leaks database connections. You need to ensure that you acquire and close all of them (Connection, Statement and ResultSet) in a try-with-resources block in the very same method block according the normal JDBC idiom.
code :
public void create(Entity entity) throws SQLException {
    try (
        Connection connection = dataSource.getConnection();
        PreparedStatement statement = connection.prepareStatement(SQL_CREATE);
    ) { 
        statement.setSomeObject(1, entity.getSomeProperty());
        // ...
        statement.executeUpdate();
    }
}
public void create(Entity entity) throws SQLException {
    Connection connection = null;
    PreparedStatement statement = null;

    try { 
        connection = dataSource.getConnection();
        statement = connection.prepareStatement(SQL_CREATE);
        statement.setSomeObject(1, entity.getSomeProperty());
        // ...
        statement.executeUpdate();
    } finally {
        if (statement != null) try { statement.close(); } catch (SQLException logOrIgnore) {}
        if (connection != null) try { connection.close(); } catch (SQLException logOrIgnore) {}
    }
}
public void close() throws SQLException {
    if (this.connection is still eligible for reuse) {
        do not close this.connection, but just return it to pool for reuse;
    } else {
        actually invoke this.connection.close();
    }
}
How to check jdbc connection and dbbool connection reach maximum or not?

How to check jdbc connection and dbbool connection reach maximum or not?


By : Hammers Fitness
Date : March 29 2020, 07:55 AM
this will help If you are using then Apache Commons Pool library, the GenereicObjectPool provides two methods:
code :
getMaxActive() returns the amount of allowed Connections

getNumActive() returns the number of actually used Connections
How do I mitigate Connection leak triggered for connection com.mysql.jdbc.JDBC4Connection@11d08960,

How do I mitigate Connection leak triggered for connection com.mysql.jdbc.JDBC4Connection@11d08960,


By : Arun Kumar À
Date : March 29 2020, 07:55 AM
hop of those help? As I have reviewed my codes over and over again. I came to realize that I was barking at the wrong tree, Seems like hikari is very reliable when it comes to connection leak. The problem is when amazon aws ec2 instance is stealing some of my cpu and is even greater than what i thought. So after the cpu goes up 99%, Connection leak is detected even though my codes clearly closed it in finally block. So the problem lies with the machine.
I thank you for all who participated to answer.
If I pass a JDBC Connection object's value to another Connection object, is only one connection open? (MySQL DB used)

If I pass a JDBC Connection object's value to another Connection object, is only one connection open? (MySQL DB used)


By : Combobreaker
Date : March 29 2020, 07:55 AM
With these it helps
If I pass a JDBC Connection object's value to another Connection object, is only one connection open?
jdbc connection with java, singleton connection object or spring jdbc connection?

jdbc connection with java, singleton connection object or spring jdbc connection?


By : reiwos
Date : March 29 2020, 07:55 AM
may help you . A vague answer for a vague question:
Rather have your JDBC connections managed. If you have too many connections open, you will have to maintain them and make sure they're closed for other connections to access the database (you can have an Exception stating "Too many open files"). Connection Pooling maintains your connection. Have 1 connection per request and once you're done, return it back to the pool.
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