SpringBoot整合MyBatis-Plus乐观锁不生效的问题及解决方法

2024-04-02 19:04:59 319人浏览泡泡鱼

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摘要

目录SpringBoot整合Myabtis-Plus1、依赖导入2、数据库插入3、springBoot各个层次的操作3.1、实体类3.2、configuration3.2.1、Tab

SpringBoot整合Myabtis-Plus

在与官网配置一致的情况下依旧无法生效，如下整合mybatis-plus

1、依赖导入

<!--        mybatis-plus-->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.4.3.4</version>
</dependency>

其余的springboot与Mysql相关的依赖就无需展示

配置文件配置

mybatis-plus:
  global-config:
    db-config:
      #      逻辑删除，删除标志
      logic-delete-value: 1
      #      逻辑删除，未删除标志
      logic-not-delete-value: 0
  type-aliases-package: com.fang.pojo
  configuration:
    #    mybatis-plus日志
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

2、数据库插入

数据库以此为例

DROP TABLE IF EXISTS sys_user;
CREATE TABLE rbac_plus.sys_user
(
    id INT AUTO_INCREMENT NOT NULL COMMENT '主键ID',
    name VARCHAR(50) NOT NULL COMMENT '名称',
    passWord VARCHAR(500) NOT NULL COMMENT '密码',
    email VARCHAR(200) NOT NULL  COMMENT '邮箱',
    state INT NOT NULL DEFAULT 0 COMMENT '状态，0为正常，1为异常',
    create_time DATETIME NOT NULL COMMENT '创建时间',
    update_time DATETIME  COMMENT '修改时间',
    deleted INT DEFAULT 0  COMMENT '假删除',
    version INT DEFAULT 1  COMMENT '乐观锁',
    PRIMARY KEY (id)
)ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COMMENT='user表';
INSERT INTO `rbac_plus`.`sys_user` (`name`, `password`, `email`, `create_time`) VALUES ('一号', '123', '123@qq.com', CURRENT_DATE),
											('二号','234','234.qq.com',CURRENT_DATE),
											('三号','345','345.qq.com',CURRENT_DATE),
											('四号','456','456.qq.com',CURRENT_DATE),
											('五号','567','567.qq.com',CURRENT_DATE),
											('六号','678','678.qq.com',CURRENT_DATE);

3、SpringBoot各个层次的操作

3.1、实体类


@Data
@TableName("sys_user")
public class SysUser implements Serializable {
    @TableId(type = IdType.AUTO)
    private Integer id;
    private String name;
    private String password;
    private String email;
    private Integer state;
    @TableField(fill = FieldFill.INSERT)
    private Date createTime;
    @TableField(fill = FieldFill.UPDATE)
    private Date updateTime;
    @TableLogic
    private Integer deleted;
    @Version
    private Integer version;

@TableName指定表名

@TableId指定表的主键，并且定义这是一个自增的主键

@TableField表示填充此属性，

@TableLogic表示假删除

@Version表示乐观锁

以上配置均将在configuration层中实现

3.2、configuration

3.2.1、TableField的insert与update

insert表示插入这一数据时，自动将当前时间填充至此属性

update表示修改此数据时，自动将当前时间填充

这里官网有告诉我们如何配置：

package com.fang.configuration;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;
import java.time.LocalDateTime;

@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("createTime",new Date(),metaObject);
    }
    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateTime",new Date(),metaObject);
    }
}

3.2.2、乐观锁配置

官网也有指出如何配置

package com.fang.configuration;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.OptimisticLockerInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MybatisPlus {
    
    @Bean
    public MybatisPlusInterceptor mybatisPlusInterceptor() {
        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
        interceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());
        return interceptor;
    }
}

3.3、mapper层

package com.fang.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.fang.pojo.SysUser;
import org.springframework.stereotype.Repository;
import java.util.List;

@Repository
public interface SysUserMapper extends BaseMapper<SysUser> {
}

3.4、service层

package com.fang.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.fang.pojo.SysUser;
import java.util.List;

public interface SysUserService extends IService<SysUser> {
}

实现类：

package com.fang.service.impl;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.fang.mapper.SysUserMapper;
import com.fang.pojo.SysUser;
import com.fang.service.SysUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service("SysUserService")
public class SysUserServiceImpl extends ServiceImpl<SysUserMapper, SysUser> implements SysUserService {
    @Autowired
    private SysUserMapper sysUserMapper;
}

4、控制层测试

4.1、查询所有

package com.fang.controller;
import com.fang.pojo.SysUser;
import com.fang.service.SysUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.WEB.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;

@RestController
@RequestMapping("/sysUser")
public class SysUserController {
    @Autowired
    private SysUserService sysUserService;
  
    @GetMapping("/baseSelAll")
    public List<SysUser> BaseSelectAll(){
        return sysUserService.list();
    }
}

apiPost测试，能够成功获取全部的集合

这里可以发现service层无需写这种简单地查询语句，即可实现基本的sql功能

4.2、根据id修改信息

这里能发现有时候乐观锁不能生效，例如以下例子：

package com.fang.controller;
import com.fang.pojo.SysUser;
import com.fang.service.SysUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;

@RestController
@RequestMapping("/sysUser")
public class SysUserController {
    @Autowired
    private SysUserService sysUserService;
   
    @PutMapping("updateById")
    public String updateById(SysUser sysUser){
        return sysUserService.updateById(sysUser)+"";
    }
}

apiPost这样测试：