mybatis-plus使用乐观锁

1.config配置文件

package com.mods.browser.config;

import com.baomidou.mybatisplus.extension.plugins.OptimisticLockerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@Configuration
@EnableTransactionManagement(proxyTargetClass = true)
@MapperScan({
    
    "com.mods.browser.mapper", "com.mods.mbg.mapper", "*.mapper"})
public class MybatisConfig {
    
    
    //分页插件
    @Bean
    public PaginationInterceptor paginationInterceptor() {
    
    
        return new PaginationInterceptor();
    }

    //乐观锁插件
    @Bean
    public OptimisticLockerInterceptor optimisticLockerInterceptor() {
    
    
        return new OptimisticLockerInterceptor();
    }
}

2. 表字段

• 主要是添加version这个字段，用于乐观锁

名	类型	长度
id	int	32
name	varchar	255
del_status	char	1
create_time	datetime	0
update_time	datetime	0
version	int	32

3. 实体类及注解

• 在version字段上加@Version注解

package com.mods.mbg.model;

import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import java.time.LocalDateTime;
import java.io.Serializable;
import java.util.Date;

import com.baomidou.mybatisplus.annotation.Version;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import lombok.EqualsAndHashCode;
@Data
@TableName("t_test")
@ApiModel(value="Test对象", description="")
public class Test implements Serializable {
    
    
    private static final long serialVersionUID = 1L;
    @TableId(value = "id", type = IdType.AUTO)
    private Integer id;
    private String name;
    private String delStatus;
    private Date createTime;
    private Date updateTime;
    @Version
    private Integer version;
}

4. 测试

更新的业务：先查询，后修改。

在使用更新操作之后，version每次会增加。

更新的时候会自动判断version和旧版本是否一致，不一致则会修改失败(写法和原来一致)

    @Override
    public Integer edit() {
    
    
        Test bean = this.baseMapper.selectById(1);
        bean.setName("asdfghjkl");
        int i = this.baseMapper.updateById(bean);
        return i;
    }

…