ShardingSphere RAW JDBC 分布式事务 Atomikos XA 代码示例

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发布于: 2020 年 12 月 06 日
ShardingSphere RAW JDBC 分布式事务 Atomikos XA 代码示例项目工程在：transaction-2pc-xa-raw-jdbc-example
代码简介    基于ShardingSphere的Atomikos XA实现一个简单的分布式事务应用demo
环境配置    启动两个MySQL5.7的docker镜像（8.0的一直报事务相关的错的，不知啥原因，换成5.7就好了），下面命令直接复制运行即可：
# 启动两个mysql
docker run --name mysql11 -p 3311:3306 -e MYSQL_ROOT_PASSWORD=root -e MYSQL_ROOT_HOST=% -d mysql:5.7
docker run --name mysql12 -p 3312:3306 -e MYSQL_ROOT_PASSWORD=root -e MYSQL_ROOT_HOST=% -d mysql:5.7
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# 在11上创建数据库demo_ds_0，运行下面的SQL语句初始化数据库和表
docker exec -ti mysql11 mysql -u root -p
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create database demo_ds_0;
use demo_ds_0;
CREATE TABLE IF NOT EXISTS t_order_0 (order_id BIGINT NOT NULL, user_id INT NOT NULL, PRIMARY KEY (order_id));
CREATE TABLE IF NOT EXISTS t_order_1 (order_id BIGINT NOT NULL, user_id INT NOT NULL, PRIMARY KEY (order_id));
    
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# 在12上创建数据库demo_ds_1，运行下面的SQL语句初始化数据库和表
docker exec -ti mysql12 mysql -u root -p
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create database demo_ds_1;
use demo_ds_1;
CREATE TABLE IF NOT EXISTS t_order_0 (order_id BIGINT NOT NULL, user_id INT NOT NULL, PRIMARY KEY (order_id));
CREATE TABLE IF NOT EXISTS t_order_1 (order_id BIGINT NOT NULL, user_id INT NOT NULL, PRIMARY KEY (order_id));
程序配置Maven依赖    核心依赖下面几个：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
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    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>transaction-2pc-xa-raw-jdbc-example</name>
    <description>Demo project for Spring Boot</description>
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    <properties>
        <java.version>1.8</java.version>
    </properties>
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    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId> <!-- Use 'netty-all' for 4.0 or above -->
            <version>8.0.14</version>
        </dependency>
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        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>shardingsphere-jdbc-core</artifactId>
            <version>5.0.0-alpha</version>
        </dependency>
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        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>shardingsphere-transaction-xa-core</artifactId>
            <version>5.0.0-alpha</version>
        </dependency>
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        <dependency>
            <groupId>com.zaxxer</groupId>
            <artifactId>HikariCP</artifactId>
            <version>2.2.5</version>
        </dependency>
    </dependencies>
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    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>7</source>
                    <target>7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
﻿
</project>
shardingSphere数据库配置文件    如上面的docker数据库配置，这里设置了两个数据库，各自有两张表
dataSources:
  ds_0: !!com.zaxxer.hikari.HikariDataSource
    driverClassName: com.mysql.cj.jdbc.Driver
    jdbcUrl: jdbc:mysql://localhost:3311/demo_ds_0?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=false&allowPublicKeyRetrieval=true
    username: root
    password: root
    autoCommit: false
  ds_1: !!com.zaxxer.hikari.HikariDataSource
    driverClassName: com.mysql.cj.jdbc.Driver
    jdbcUrl: jdbc:mysql://localhost:3312/demo_ds_1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=false&allowPublicKeyRetrieval=true
    username: root
    password: root
    autoCommit: false
﻿
rules:
- !SHARDING
  tables:
    t_order:
      actualDataNodes: ds_${0..1}.t_order_${0..1}
      databaseStrategy:
        standard:
          shardingColumn: user_id
          shardingAlgorithmName: database_inline
      tableStrategy:
        standard:
          shardingColumn: order_id
          shardingAlgorithmName: t_order_inline
  bindingTables:
    - t_order
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  shardingAlgorithms:
    database_inline:
      type: INLINE
      props:
        algorithm-expression: ds_${user_id % 2}
    t_order_inline:
      type: INLINE
      props:
        algorithm-expression: t_order_${order_id % 2}
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props:
  sql-show: true
主程序    暴力直接的原生测试，代码如下：
package com.example.demo;
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import org.apache.shardingsphere.driver.api.yaml.YamlShardingSphereDataSourceFactory;
import org.apache.shardingsphere.transaction.core.TransactionType;
import org.apache.shardingsphere.transaction.core.TransactionTypeHolder;
﻿
import javax.sql.DataSource;
import java.io.File;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
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public class Transaction2pcXaRawJdbcExampleApplication {
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    /**
     * 第一次插入数据正常运行成功
     * 第二次插入数据由于主键冲突，导致回滚
     */
    public static void main(String[] args) throws IOException, SQLException {
        DataSource dataSource = getShardingDatasource();
        cleanupData(dataSource);
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        TransactionTypeHolder.set(TransactionType.XA);
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        Connection conn = dataSource.getConnection();
        String sql = "insert into t_order (user_id, order_id) VALUES (?, ?);";
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        System.out.println("First XA Start insert data");
        try (PreparedStatement statement = conn.prepareStatement(sql)) {
            conn.setAutoCommit(false);
            for (int i = 1; i < 11; i++) {
                statement.setLong(1, i);
                statement.setLong(2, i);
                statement.executeUpdate();
            }
            conn.commit();
        }
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        System.out.println("First XA insert successful");
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        // 设置id+5，如果设置XA事务成功，则所有的数据都不会插入
        // 设置id+5，如果设置XA事务不成功，则id大于10的数据就会插入到数据库
        // 程序运行完毕后，查看数据库，没有id大于10的数据，所以XA设置成功
        System.out.println("Second XA Start insert data");
        try (PreparedStatement statement = conn.prepareStatement(sql)) {
            conn.setAutoCommit(false);
            for (int i = 1; i < 11; i++) {
                statement.setLong(1, i+5);
                statement.setLong(2, i+5);
                statement.executeUpdate();
            }
            conn.commit();
        } catch (Exception e) {
            System.out.println("Second XA insert failed");
            conn.rollback();
        } finally {
            conn.close();
        }
        System.out.println("Second XA insert successful");
    }
﻿
    private static void cleanupData(DataSource dataSource) {
        System.out.println("Delete all Data");
        try (Connection conn = dataSource.getConnection(); Statement statement = conn.createStatement()) {
            statement.execute("delete from t_order;");
            conn.commit();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        System.out.println("Delete all Data successful");
    }
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    /**
     * 生成DataSource，文件路径自行替换
     * @return
     * @throws IOException
     * @throws SQLException
     */
    static private DataSource getShardingDatasource() throws IOException, SQLException {
        String fileName = "F:\\Code\\Java\\JAVA-000\\homework\\shardingSphere-jdbc-example\\transaction-example\\transaction-2pc-xa-raw-jdbc-example\\src\\main\\resources\\sharding-databases-tables.yaml";
        File yamlFile = new File(fileName);
        return YamlShardingSphereDataSourceFactory.createDataSource(yamlFile);
    }
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}
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发布于: 2020 年 12 月 06 日阅读数: 58
原文链接:【http://xie.infoq.cn/article/75196b1dfdc0c71b8d66391b2】。
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