SpringBoot的MyBatis的配置类

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一 数据源配置

package com.imooc.demo.config.dao;

import java.beans.PropertyVetoException;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.mchange.v2.c3p0.ComboPooledDataSource;

/**
* 配置datasource到ioc容器里面
*/
@Configuration
// 配置mybatis mapper的扫描路径
@MapperScan("com.imooc.demo.dao")
public class DataSourceConfiguration {
    @Value("${jdbc.driver}")
    private String jdbcDriver;
    @Value("${jdbc.url}")
    private String jdbcUrl;
    @Value("${jdbc.username}")
    private String jdbcUsername;
    @Value("${jdbc.password}")
    private String jdbcPassword;

    /**
     * 生成与spring-dao.xml对应的bean dataSource
     *
     * @return
     * @throws PropertyVetoException
     */
    @Bean(name = "dataSource")
    public ComboPooledDataSource createDataSource() throws PropertyVetoException {
        // 生成datasource实例
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        // 跟配置文件一样设置以下信息
        // 驱动
        dataSource.setDriverClass(jdbcDriver);
        // 数据库连接URL
        dataSource.setJdbcUrl(jdbcUrl);
        // 设置用户名
        dataSource.setUser(jdbcUsername);
        // 设置用户密码
        dataSource.setPassword(jdbcPassword);
        // 配置c3p0连接池的私有属性
        // 连接池最大线程数
        dataSource.setMaxPoolSize(30);
        // 连接池最小线程数
        dataSource.setMinPoolSize(10);
        // 关闭连接后不自动commit
        dataSource.setAutoCommitOnClose(false);
        // 连接超时时间
        dataSource.setCheckoutTimeout(10000);
        // 连接失败重试次数
        dataSource.setAcquireRetryAttempts(2);
        return dataSource;
    }

}

二 会话工厂配置

package com.imooc.demo.config.dao;

import java.io.IOException;

import javax.sql.DataSource;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

@Configuration
public class SessionFactoryConfiguration {
    // mybatis-config.xml配置文件的路径
    private static String mybatisConfigFile;

    @Value("${mybatis_config_file}")
    public void setMybatisConfigFile(String mybatisConfigFile) {
        SessionFactoryConfiguration.mybatisConfigFile = mybatisConfigFile;
    }

    // mybatis mapper文件所在路径
    private static String mapperPath;

    @Value("${mapper_path}")
    public void setMapperPath(String mapperPath) {
        SessionFactoryConfiguration.mapperPath = mapperPath;
    }

    // 实体类所在的package
    @Value("${type_alias_package}")
    private String typeAliasPackage;

    @Autowired
    private DataSource dataSource;

    /**
     * 创建sqlSessionFactoryBean 实例 并且设置configtion 设置mapper 映射路径 设置datasource数据源
     *
     * @return
     * @throws IOException
     */
    @Bean(name = "sqlSessionFactory")
    public SqlSessionFactoryBean createSqlSessionFactoryBean() throws IOException {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        // 设置mybatis configuration 扫描路径
        sqlSessionFactoryBean.setConfigLocation(new ClassPathResource(mybatisConfigFile));
        // 添加mapper 扫描路径
        PathMatchingResourcePatternResolver pathMatchingResourcePatternResolver = new PathMatchingResourcePatternResolver();
        String packageSearchPath = ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + mapperPath;
        sqlSessionFactoryBean.setMapperLocations(pathMatchingResourcePatternResolver.getResources(packageSearchPath));
        // 设置dataSource
        sqlSessionFactoryBean.setDataSource(dataSource);
        // 设置typeAlias 包扫描路径
        sqlSessionFactoryBean.setTypeAliasesPackage(typeAliasPackage);
        return sqlSessionFactoryBean;
    }

}

三 事务配置

package com.imooc.demo.config.service;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;

/**
* 对标spring-service里面的transactionManager
* 继承TransactionManagementConfigurer是因为开启annotation-driven

*
*/
@Configuration
// 首先使用注解 @EnableTransactionManagement 开启事务支持后
// 在Service方法上添加注解 @Transactional 便可
@EnableTransactionManagement
public class TransactionManagementConfiguration implements TransactionManagementConfigurer {

    @Autowired
    // 注入DataSourceConfiguration里边的dataSource,通过createDataSource()获取
    private DataSource dataSource;

    @Override
    /**
     * 关于事务管理，需要返回PlatformTransactionManager的实现
     */
    public PlatformTransactionManager annotationDrivenTransactionManager() {
        return new DataSourceTransactionManager(dataSource);
    }

}