Spring之路(39)–基于TransactionTemplate的编程式事务管理

package org.maoge.templatetran;
import javax.sql.DataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.support.TransactionTemplate;
import com.alibaba.druid.pool.DruidDataSource;
/**
* Spring配置类
*/
@Configuration
public class SpringConfig {
   /**
    * 定义数据源bean
    */
   @Bean
   public DataSource dataSource() {
    DruidDataSource dataSource = new DruidDataSource();
    dataSource.setDriverClassName("com.mysql.jdbc.Driver");
    dataSource.setUrl("jdbc:mysql://127.0.0.1:3306/myblog?useUnicode=true&characterEncoding=utf-8");
    dataSource.setUsername("root");
    dataSource.setPassword("Easy@0122");
    return dataSource;
   }
   /**
    * 定义事务管理bean
    */
   @Bean
   public PlatformTransactionManager transactionManager() {
    DataSourceTransactionManager transactionManager = new DataSourceTransactionManager();
    transactionManager.setDataSource(dataSource());// 注入dataSource
    return transactionManager;
   }
   /**
    * 定义TransactionTemplate类型的bean
    */
   @Bean
   public TransactionTemplate transactionTemplate() {
    TransactionTemplate transactionTemplate=new TransactionTemplate();
    transactionTemplate.setTransactionManager(transactionManager());//注入事务管理器
    return transactionTemplate;
   }
   /**
    * 配置namedParameterJdbcTemplate组件
    */
   @Bean
   public NamedParameterJdbcTemplate namedParameterJdbcTemplate() {
    NamedParameterJdbcTemplate template = new NamedParameterJdbcTemplate(dataSource());// 注入dataSource
    return template;
   }
   /**
    * 为BlogDao注册bean
    */
   @Bean
   public BlogDao blogDao() {
    BlogDao blogDao = new BlogDao();
    blogDao.setNamedTemplate(namedParameterJdbcTemplate());// 注入namedParameterJdbcTemplate
    return blogDao;
   }
}

package org.maoge.templatetran;
import java.util.HashMap;
import java.util.Map;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
/**
* @theme DAO--博客
* @author maoge
* @date 2020-01-29
*/
public class BlogDao {
   public NamedParameterJdbcTemplate getNamedTemplate() {
    return namedTemplate;
   }
   public void setNamedTemplate(NamedParameterJdbcTemplate namedTemplate) {
    this.namedTemplate = namedTemplate;
   }
   private NamedParameterJdbcTemplate namedTemplate;
   /**
    * 新增
    */
   public void insert(BlogDo blog) {
    Map<String, Object> map = new HashMap<>();
    map.put("author", blog.getAuthor());
    map.put("content", blog.getContent());
    map.put("title", blog.getTitle());
    // 注意使用:xxx占位
    namedTemplate.update("insert into blog(author,content,title)values(:author,:content,:title)", map);
   }
}

package org.maoge.templatetran;
/**
 * @theme 数据对象--博客
 * @author maoge
 * @date 2020-01-27
 */
public class BlogDo {
  private Long id;
  private String title;
  private String author;
  private String content;
  // 省略get get
}

测试验证，注意使用事务时，通过TransactionTemplate类的方法使用：
package org.maoge.templatetran;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.transaction.TransactionStatus;
import org.springframework.transaction.support.TransactionCallbackWithoutResult;
import org.springframework.transaction.support.TransactionTemplate;
public class Main {
  public static void main(String[] args) {
    // 获取容器
    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(SpringConfig.class);
    // 容器中获取TransactionTemplate
    TransactionTemplate transactionTemplate = (TransactionTemplate) context.getBean("transactionTemplate");
    // 容器中获取数据库操作组件
    BlogDao blogDao = (BlogDao) context.getBean("blogDao");
    transactionTemplate.execute(new TransactionCallbackWithoutResult() {
      // 注意！该方法中的操作会实现事务
      @Override
      protected void doInTransactionWithoutResult(TransactionStatus arg0) {
        BlogDo blog = new BlogDo();
        blog.setContent("测试");
        blogDao.insert(blog);
        int a = 1 / 0;// 发生异常，导致事务回滚，所以并不会插入任何一行数据
        blogDao.insert(blog);
      }
    });
  }
}