How to Connect Java to Mysql from command line (cmd)

In this video Lesson, I am gonna describe the MySQL Relational Database Management System.
I presume that you are having some knowledge on RDBMS and the MySQL language.

Steps of JDBC Program are as follows :

Allocate a Connection object, for connecting to the database server.
Allocate a Statement object, under the Connection created earlier, for holding a SQL command.
Write a SQL query and execute the query, via the Statement and Connection created.
Process the query result.
Close the Statement and Connection.

The JDBC operations are carried out through the “Connection”, and “Statement” objects (defined in package java.sql). However, you need not to worry about knowing the details, but merely the public methods defined in the API (Application Program Interface).
Note that there is little programming involved in using JDBC programming. You only have to specify the database-URL, write the MySQL query, and process the query result. The rest of the codes are kind of “standard JDBC program”.
Lets try to understand the sql poackage classes and others:
Driver class: The driver class for the mysql database is com.mysql.jdbc.Driver.
Connection URL: The connection URL for the mysql database is jdbc:mysql://localhost/javaexpert where jdbc is the API, mysql is the database, localhost is the server name on which mysql is running, we may also use IP address, like 3306 is the port number if you change the port number while installing Mysql to your PC and javaExpert is the database name. We may use any database, in such case, we need to replace the javaexpert with your database name.
Username: The default username for the mysql database is root.
Password: It is the password given by the user at the time of installing the mysql database. In this example, we are going to use 0000 as the password.

To Load the jar file by Setting classpath:
Temporary setting
C:angle bracket sign set classpath=c:\folder\mysql-connector-java-5.0.8-bin.jar;.;

How to set the permanent classpath?
Go to environment variable then click on new tab. In variable name write classpath and in variable value paste the path to the mysqlconnector.jar file by appending mysqlconnector.jar;.; as C:\folder\mysql-connector-java-5.0.8-bin.jar;.;

Subscribe : https://www.youtube.com/channel/UCKlVOeHT0h_dIMMp_VrjGUw

#java #mysql #database

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How to Connect Java to Mysql from command line (cmd)
Tyrique  Littel

Tyrique Littel

1600135200

How to Install OpenJDK 11 on CentOS 8

What is OpenJDK?

OpenJDk or Open Java Development Kit is a free, open-source framework of the Java Platform, Standard Edition (or Java SE). It contains the virtual machine, the Java Class Library, and the Java compiler. The difference between the Oracle OpenJDK and Oracle JDK is that OpenJDK is a source code reference point for the open-source model. Simultaneously, the Oracle JDK is a continuation or advanced model of the OpenJDK, which is not open source and requires a license to use.

In this article, we will be installing OpenJDK on Centos 8.

#tutorials #alternatives #centos #centos 8 #configuration #dnf #frameworks #java #java development kit #java ee #java environment variables #java framework #java jdk #java jre #java platform #java sdk #java se #jdk #jre #open java development kit #open source #openjdk #openjdk 11 #openjdk 8 #openjdk runtime environment

Joe  Hoppe

Joe Hoppe

1595905879

Best MySQL DigitalOcean Performance – ScaleGrid vs. DigitalOcean Managed Databases

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MySQL is the all-time number one open source database in the world, and a staple in RDBMS space. DigitalOcean is quickly building its reputation as the developers cloud by providing an affordable, flexible and easy to use cloud platform for developers to work with. MySQL on DigitalOcean is a natural fit, but what’s the best way to deploy your cloud database? In this post, we are going to compare the top two providers, DigitalOcean Managed Databases for MySQL vs. ScaleGrid MySQL hosting on DigitalOcean.

At a glance – TLDR
ScaleGrid Blog - At a glance overview - 1st pointCompare Throughput
ScaleGrid averages almost 40% higher throughput over DigitalOcean for MySQL, with up to 46% higher throughput in write-intensive workloads. Read now

ScaleGrid Blog - At a glance overview - 2nd pointCompare Latency
On average, ScaleGrid achieves almost 30% lower latency over DigitalOcean for the same deployment configurations. Read now

ScaleGrid Blog - At a glance overview - 3rd pointCompare Pricing
ScaleGrid provides 30% more storage on average vs. DigitalOcean for MySQL at the same affordable price. Read now

MySQL DigitalOcean Performance Benchmark
In this benchmark, we compare equivalent plan sizes between ScaleGrid MySQL on DigitalOcean and DigitalOcean Managed Databases for MySQL. We are going to use a common, popular plan size using the below configurations for this performance benchmark:

Comparison Overview
ScaleGridDigitalOceanInstance TypeMedium: 4 vCPUsMedium: 4 vCPUsMySQL Version8.0.208.0.20RAM8GB8GBSSD140GB115GBDeployment TypeStandaloneStandaloneRegionSF03SF03SupportIncludedBusiness-level support included with account sizes over $500/monthMonthly Price$120$120

As you can see above, ScaleGrid and DigitalOcean offer the same plan configurations across this plan size, apart from SSD where ScaleGrid provides over 20% more storage for the same price.

To ensure the most accurate results in our performance tests, we run the benchmark four times for each comparison to find the average performance across throughput and latency over read-intensive workloads, balanced workloads, and write-intensive workloads.

Throughput
In this benchmark, we measure MySQL throughput in terms of queries per second (QPS) to measure our query efficiency. To quickly summarize the results, we display read-intensive, write-intensive and balanced workload averages below for 150 threads for ScaleGrid vs. DigitalOcean MySQL:

ScaleGrid MySQL vs DigitalOcean Managed Databases - Throughput Performance Graph

For the common 150 thread comparison, ScaleGrid averages almost 40% higher throughput over DigitalOcean for MySQL, with up to 46% higher throughput in write-intensive workloads.

#cloud #database #developer #digital ocean #mysql #performance #scalegrid #95th percentile latency #balanced workloads #developers cloud #digitalocean droplet #digitalocean managed databases #digitalocean performance #digitalocean pricing #higher throughput #latency benchmark #lower latency #mysql benchmark setup #mysql client threads #mysql configuration #mysql digitalocean #mysql latency #mysql on digitalocean #mysql throughput #performance benchmark #queries per second #read-intensive #scalegrid mysql #scalegrid vs. digitalocean #throughput benchmark #write-intensive

Samanta  Moore

Samanta Moore

1620458875

Going Beyond Java 8: Local Variable Type Inference (var) - DZone Java

According to some surveys, such as JetBrains’s great survey, Java 8 is currently the most used version of Java, despite being a 2014 release.

What you are reading is one in a series of articles titled ‘Going beyond Java 8,’ inspired by the contents of my book, Java for Aliens. These articles will guide you step-by-step through the most important features introduced to the language, starting from version 9. The aim is to make you aware of how important it is to move forward from Java 8, explaining the enormous advantages that the latest versions of the language offer.

In this article, we will talk about the most important new feature introduced with Java 10. Officially called local variable type inference, this feature is better known as the **introduction of the word **var. Despite the complicated name, it is actually quite a simple feature to use. However, some observations need to be made before we can see the impact that the introduction of the word var has on other pre-existing characteristics.

#java #java 11 #java 10 #java 12 #var #java 14 #java 13 #java 15 #verbosity

How to Connect Java to Mysql from command line (cmd)

In this video Lesson, I am gonna describe the MySQL Relational Database Management System.
I presume that you are having some knowledge on RDBMS and the MySQL language.

Steps of JDBC Program are as follows :

Allocate a Connection object, for connecting to the database server.
Allocate a Statement object, under the Connection created earlier, for holding a SQL command.
Write a SQL query and execute the query, via the Statement and Connection created.
Process the query result.
Close the Statement and Connection.

The JDBC operations are carried out through the “Connection”, and “Statement” objects (defined in package java.sql). However, you need not to worry about knowing the details, but merely the public methods defined in the API (Application Program Interface).
Note that there is little programming involved in using JDBC programming. You only have to specify the database-URL, write the MySQL query, and process the query result. The rest of the codes are kind of “standard JDBC program”.
Lets try to understand the sql poackage classes and others:
Driver class: The driver class for the mysql database is com.mysql.jdbc.Driver.
Connection URL: The connection URL for the mysql database is jdbc:mysql://localhost/javaexpert where jdbc is the API, mysql is the database, localhost is the server name on which mysql is running, we may also use IP address, like 3306 is the port number if you change the port number while installing Mysql to your PC and javaExpert is the database name. We may use any database, in such case, we need to replace the javaexpert with your database name.
Username: The default username for the mysql database is root.
Password: It is the password given by the user at the time of installing the mysql database. In this example, we are going to use 0000 as the password.

To Load the jar file by Setting classpath:
Temporary setting
C:angle bracket sign set classpath=c:\folder\mysql-connector-java-5.0.8-bin.jar;.;

How to set the permanent classpath?
Go to environment variable then click on new tab. In variable name write classpath and in variable value paste the path to the mysqlconnector.jar file by appending mysqlconnector.jar;.; as C:\folder\mysql-connector-java-5.0.8-bin.jar;.;

Subscribe : https://www.youtube.com/channel/UCKlVOeHT0h_dIMMp_VrjGUw

#java #mysql #database

Joseph  Murray

Joseph Murray

1621522320

Command Line Arguments in Java [With Example]

Home > Full Stack Development > Command Line Arguments in Java [With Example]

While writing your Java programs, you must have noticed the (String[] args) in the main() method. These are command-line arguments being stored in the string passed to the main method. These arguments are called command-line arguments.

It is quite common to use command-line arguments because you don’t want your application to do the same thing in every run. If we want to configure its behaviour somehow, we will have to use command-line arguments.

#full stack development #arguements in java #command line arguments in java #java