如何使用 PolarDB-X

curl -fsSL https://get.docker.com | bash -s docker --mirror Aliyun

systemctl start docker

docker run -d --name some-polardb-x -p 8527:8527 polardbx/polardb-x:2.1.0

yum install mysql -y

mysql -V

mysql -h127.0.0.1 -P8527 -upolardbx_root -p123456

yum -y install java-1.8.0-openjdk*

java -version

yum -y install git

git clone https://github.com/spring-guides/gs-accessing-data-mysql.git

cd gs-accessing-data-mysql/initial
git checkout b8408e3a1e05008811d542b706107d45160556ac

ls

mysql -h127.0.0.1 -P8527 -upolardbx_root -p123456

create database db_example;

create user 'springuser'@'%' identified by 'ThePassword';

grant all on db_example.* to 'springuser'@'%';

vim src/main/resources/application.properties

spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:8527/db_example

vim src/main/java/com/example/accessingdatamysql/User.java

package com.example.accessingdatamysql;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity // This tells Hibernate to make a table out of this class
public class User {
  @Id
  @GeneratedValue(strategy=GenerationType.AUTO)
  private Integer id;
  private String name;
  private String email;
  public Integer getId() {
    return id;
  }
  public void setId(Integer id) {
    this.id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getEmail() {
    return email;
  }
  public void setEmail(String email) {
    this.email = email;
  }
}

vim src/main/java/com/example/accessingdatamysql/UserRepository.java

package com.example.accessingdatamysql;
import org.springframework.data.repository.CrudRepository;
import com.example.accessingdatamysql.User;
// This will be AUTO IMPLEMENTED by Spring into a Bean called userRepository
// CRUD refers Create, Read, Update, Delete
public interface UserRepository extends CrudRepository<User, Integer> {
}

vim src/main/java/com/example/accessingdatamysql/MainController.java

package com.example.accessingdatamysql;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller // This means that this class is a Controller
@RequestMapping(path="/demo") // This means URL's start with /demo (after Application path)
public class MainController {
  @Autowired // This means to get the bean called userRepository
         // Which is auto-generated by Spring, we will use it to handle the data
  private UserRepository userRepository;
  @PostMapping(path="/add") // Map ONLY POST Requests
  public @ResponseBody String addNewUser (@RequestParam String name
      , @RequestParam String email) {
    // @ResponseBody means the returned String is the response, not a view name
    // @RequestParam means it is a parameter from the GET or POST request
    User n = new User();
    n.setName(name);
    n.setEmail(email);
    userRepository.save(n);
    return "Saved";
  }
  @GetMapping(path="/all")
  public @ResponseBody Iterable<User> getAllUsers() {
    // This returns a JSON or XML with the users
    return userRepository.findAll();
  }
}

vim src/main/java/com/example/accessingdatamysql/AccessingDataMysqlApplication.java

package com.example.accessingdatamysql;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class AccessingDataMysqlApplication {
  public static void main(String[] args) {
    SpringApplication.run(AccessingDataMysqlApplication.class, args);
  }
}

./gradlew bootRun

curl localhost:8080/demo/add -d name=First -d email=username@example.com

curl 'localhost:8080/demo/all'

mysql -h127.0.0.1 -P8527 -upolardbx_root -p123456

use db_example;

select * from user;

docker run --name some-wordpress -p 9090:80 -d wordpress

mysql -h127.0.0.1 -P8527 -upolardbx_root -p123456

create database wordpress MODE='AUTO';