九、开启声明式事务

package com.biniu.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.github.pagehelper.PageHelper;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;

import javax.sql.DataSource;
import java.util.Properties;

/**
 * mybatis配置文件
 * @author lay
 * @date 2018/4/23.
 * @time 15:01
 */
@Configuration
@EnableTransactionManagement
@MapperScan(basePackages = "com.biniu.dao")
public class MyBatisConfig implements TransactionManagementConfigurer {

    @Autowired
    private DataSource dataSource;

    @Bean
    public SqlSessionFactory sqlSessionFactory() throws Exception {
        SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
        // 数据源
        bean.setDataSource(dataSource);
        // sql文件
        bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/*.xml"));
        // 分页插件
        PageHelper pageHelper = new PageHelper();
        Properties properties = new Properties();
        // 禁用分页参数合理化
        properties.setProperty("reasonable", "false");
        properties.setProperty("supportMethodsArguments", "true");
        properties.setProperty("returnPageInfo", "check");
        properties.setProperty("params", "count=countSql");
        properties.setProperty("helperDialect", "mysql");
        pageHelper.setProperties(properties);
        bean.setPlugins(new Interceptor[]{pageHelper});
        return bean.getObject();
    }

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource dataSource() {
        return new DruidDataSource();
    }

    /**
     * 事务注入数据源
     * @return
     */
    @Override
    public PlatformTransactionManager annotationDrivenTransactionManager() {
        return new DataSourceTransactionManager(dataSource);
    }
}

springboot开启声明式事务很简单：

1）注解: @EnableTransactionManagement

2) 实现：TransactionManagementConfigurer接口

3）注入数据源

注意：如果存在多数据源的情况，只能指定一个数据源开启声明式事务，否则会报错