SpringBoot集成Mybatis和Druid

1. 集成Mybatis

配置官方文档：mybatis-spring-boot-autoconfigure

1. 添加依赖：

<dependency>
	<groupId>org.mybatis.spring.boot</groupId>
	<artifactId>mybatis-spring-boot-starter</artifactId>
	<version>1.3.2</version>
</dependency>

2. 添加application.properties

#mybatis
mybatis.type-aliases-package=com.liuyao.miaosha.domain
mybatis.configuration.map-underscore-to-camel-case=true
mybatis.configuration.default-fetch-size=100
mybatis.configuration.default-statement-timeout=30
mybatis.mapper-locations=classpath:com/liuyao/miaosha/dao/*.xml

集成Druid数据源

1. 添加依赖：

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.10</version>
</dependency>

2. 修改配置文件：

# druid
spring.datasource.url=jdbc:mysql://localhost:3306/miaosha?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.filters=stat
spring.datasource.maxActive=2
spring.datasource.initialSize=1
spring.datasource.maxWait=60000
spring.datasource.minIdle=1
spring.datasource.timeBetweenEvictionRunsMillis=60000
spring.datasource.minEvictableIdleTimeMillis=300000
spring.datasource.validationQuery=select 'x'
spring.datasource.testWhileIdle=true
spring.datasource.testOnBorrow=false
spring.datasource.testOnReturn=false
spring.datasource.poolPreparedStatements=true
spring.datasource.maxOpenPreparedStatements=20

3. 测试

测试UserDao（sql语句可以直接写在方法上）

import com.liuyao.miaosha.domain.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;


@Mapper
public interface UserDao {
    @Select("select * from user where id = #{id}")
    public User getById(@Param("id") int id);

    @Insert("insert into user(id,name) values(#{id},#{name})")
    int insert(User user);
}

测试事务：

    @Transactional
    public boolean tx() {
        User user1 = new User();
        user1.setId(2);
        user1.setName("bbb");
        userDao.insert(user1);

        User user2 = new User();
        user2.setId(1);
        user2.setName("ccc");
        userDao.insert(user2);
        return true;
    }

插入一个在数据库中已经存在的用户，将会导致回滚