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springboot-mybatits数据库，ecache缓存操作，批量操作，事物操作
文章目录
代码下载： https://github.com/2010yhh/springBoot-demos.git
环境
idea2018，jdk1.8，
springboot版本：1.5.9.RELEASE
1.mybatits，数据库ecache缓存操作
ecache配置：
<?xml version="1.0" encoding="UTF-8"?>
<ehcache updateCheck="false" name="shiroCache">
<diskStore path="java.io.tmpdir"/>
<defaultCache
maxElementsInMemory="10000"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="false"
diskPersistent="false"
diskExpiryThreadIntervalSeconds="120"
/>
<!-- 表示此缓存最多可以存活2分钟，如果期间超过1分钟未访问 那么此缓存失效-->
<cache name="user"
maxEntriesLocalHeap="2000"
eternal="false"
timeToIdleSeconds="60"
timeToLiveSeconds="120"
overflowToDisk="false"
statistics="true">
</cache>
</ehcache>
使用：
@Service
@CacheConfig(cacheNames = {"user"})
public class UserServiceImpl implements UserService {
@Autowired
UserMapper userMapper;
@Cacheable(key = "#userName")
@Override
public List<User> findByUserName(String userName, String passWord) {
UserExample example = new UserExample();
example.createCriteria().andUserNameEqualTo(userName).andPassWordEqualTo(passWord);
return userMapper.selectByExample(example);
}
@CachePut(key = "#user.userId")
@Override
@Transactional(isolation = Isolation.DEFAULT, propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
public void addUser(User user) {
//测试事物特性
userMapper.insertSelective(user);
//userMapper.insertSelective(user);
}
}
测试时，设置缓存30s,（timeToIdleSeconds=“30”
timeToLiveSeconds=“30”）在缓存有效期内查询：从日志可看出，只查询数据库一次。
2.mybatits，数据库批量操作：增删查改
配置：mapper的sql语句
<!-- 批量增删查改 -->
<insert id="batchAddUser" parameterType="java.util.List" useGeneratedKeys="true" keyProperty="userId">
insert into sys_user (user_id, user_name, real_name,
pass_word, telephone, email,
photo, create_time, update_time,
status)
values
<foreach collection="list" item="item" index="index"
separator=",">
(#{item.userId,jdbcType=INTEGER}, #{item.userName,jdbcType=VARCHAR}, #{item.realName,jdbcType=VARCHAR},
#{item.passWord,jdbcType=VARCHAR}, #{item.telephone,jdbcType=VARCHAR}, #{item.email,jdbcType=VARCHAR},
#{item.photo,jdbcType=VARCHAR}, #{item.createTime,jdbcType=TIMESTAMP},
#{item.updateTime,jdbcType=TIMESTAMP},
#{item.status,jdbcType=INTEGER})
</foreach>
</insert>
<!-- 批量删除-->
<delete id="batchDeleteUser" parameterType="java.util.List">
delete from sys_user where user_id in
<foreach collection="list" index="index" item="item" open="("
separator="," close=")">
#{item}
</foreach>
</delete>
<!--批量查询 -->
<select id="batchFindUser" resultMap="BaseResultMap" parameterType="java.util.List">
select
<include refid="Base_Column_List"/>
from sys_user
where user_name in
<foreach collection="list" item="index" separator="," open="("
close=")">
#{index}
</foreach>
</select>
<!--批量更新1 -->
<update id="batchUpdate" parameterType="java.util.List">
<foreach collection="list" separator=";" item="item" open="" close="">
update sys_user
<set>
<if test="#{item.userName} != null">
user_name = #{item.userName},
</if>
<if test="#{item.realName} != null">
real_name = #{item.realName},
</if>
<if test="#{item.passWord} != null">
pass_word = #{item.passWord},
</if>
<if test="#{item.telephone} != null">
telephone = #{item.telephone},
</if>
<if test="#{item.email} != null">
email = #{item.email,jdbcType=VARCHAR},
</if>
<if test="#{item.photo} != null">
photo = #{item.photo},
</if>
<if test="#{item.createTime}!= null">
create_time = #{item.createTime},
</if>
<if test="#{item.updateTime}!= null">
update_time = #{item.updateTime},
</if>
<if test="#{item.status} != null">
status = #{item.status},
</if>
</set>
where user_id = #{item.userId}
</foreach>
</update>
<!--批量更新2 -->
<update id="batchUpdateUser" parameterType="java.util.List">
update sys_user
<trim prefix="set" suffixOverrides=",">
<trim prefix="user_name =case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.userName!=null">
when user_id=#{item.userId} then #{item.userName}
</if>
</foreach>
</trim>
<trim prefix="real_name =case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.realName!=null">
when user_id=#{item.userId} then #{item.realName}
</if>
</foreach>
</trim>
<trim prefix="pass_word =case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.passWord!=null">
when user_id=#{item.userId} then #{item.passWord}
</if>
</foreach>
</trim>
<trim prefix="telephone=case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.telephone!=null">
when user_id=#{item.userId} then #{item.telephone}
</if>
</foreach>
</trim>
<trim prefix="email =case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.email!=null">
when user_id=#{item.userId} then #{item.email}
</if>
</foreach>
</trim>
<trim prefix="photo =case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.photo!=null">
when user_id=#{item.userId} then #{item.photo}
</if>
</foreach>
</trim>
<trim prefix="create_time=case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.createTime!=null">
when user_id=#{item.userId} then #{item.createTime}
</if>
</foreach>
</trim>
<trim prefix="update_time =case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.updateTime!=null">
when user_id=#{item.userId} then #{item.updateTime}
</if>
</foreach>
</trim>
<trim prefix="status=case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.status!=null">
when user_id=#{item.userId} then #{item.status}
</if>
</foreach>
</trim>
</trim>
<where>
<foreach collection="list" separator="or" item="item">
user_id= #{item.userId}
</foreach>
</where>
</update>
2.1批量查询：
2.2批量插入：
2.3批量更新：
2.4批量删除：
3.mybatits，数据库事物操作
* 声明式事务管理： 建立在AOP之上的。其本质是对方法前后进行拦截， * 然后在目标方法开始之前创建或者加入一个事务，在执行完目标方法之后根据执行情况提交或者回滚事务。 * 声明式事务管理不需要入侵代码，通过@Transactional就可以进行事务操作，更快捷而且简单 * 隔离级别 * 隔离级别是指若干个并发的事务之间的隔离程度，与我们开发时候主要相关的场景包括：脏读取、重复读、幻读 */ /** * 传播行为 * 所谓事务的传播行为是指，如果在开始当前事务之前， * 一个事务上下文已经存在，此时有若干选项可以指定一个事务性方法的执行行为 */
@CacheEvict(key = "#id")
@Override
@Transactional(isolation = Isolation.DEFAULT, propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
public void deleteUser(int userId) {
//测试事物特性
//userMapper.insertSelective(user);
userMapper.deleteByPrimaryKey(userId);
}
