51工具盒子遵守诺言就象保卫你的荣誉一样。------巴尔扎克
官方文档里说首先需要加@TableField注解并指定fill的值
对应的值在com.baomidou.mybatisplus.annotation.FieldFill这个枚举里
例如我这里gmtCreate字段需要在新增的时候自动填充，就使用FieldFill.INSERT
然而我需要让gmtModified字段在新增和修改的时候都自动填充，就使用FieldFill.INSERT_UPDATE
不过，加了注解后咱们还得去注入一个com.baomidou.mybatisplus.core.handlers.MetaObjectHandler
完整代码如下
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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 | hljs java package com.ruben.simpleideaboot.config; import com.baomidou.mybatisplus.annotation.DbType; import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler; import com.baomidou.mybatisplus.core.handlers.StrictFill; import com.baomidou.mybatisplus.core.toolkit.LambdaUtils; import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor; import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor; import com.ruben.simpleideaboot.pojo.User; import org.apache.ibatis.reflection.MetaObject; import org.apache.ibatis.reflection.property.PropertyNamer; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import java.time.LocalDateTime; import java.util.Arrays; /** * mybatis-plus配置类 * * @author <achao1441470436@gmail.com> * @since 2021/5/20 0020 9:29 */ @Configuration public class MybatisPlusConfig { /** * 分页拦截器 * * @author <achao1441470436@gmail.com> * @since 2021/5/20 0020 9:29 */ @Bean public MybatisPlusInterceptor mybatisPlusInterceptor() { MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor(); PaginationInnerInterceptor innerInterceptor = new PaginationInnerInterceptor(DbType.MYSQL); // 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求 默认false innerInterceptor.setOverflow(true); // 最大分页限制200条 innerInterceptor.setMaxLimit(200L); interceptor.addInnerInterceptor(innerInterceptor); return interceptor; } @Bean public MetaObjectHandler metaObjectHandler() { return new MetaObjectHandler() { /** * 插入元对象字段填充（用于插入时对公共字段的填充） * * @param metaObject 元对象 */ @Override public void insertFill(MetaObject metaObject) { // 不止一种写法 this.strictInsertFill(findTableInfo(metaObject), metaObject, Arrays.asList( // 从User::getGmtCreate拿到属性gmtCreate，然后调用LocalDateTime.now()填充 StrictFill.of(PropertyNamer.methodToProperty(LambdaUtils.resolve(User::getGmtCreate) .getImplMethodName()), LocalDateTime::now, LocalDateTime.class), // 填充LocalDateTime.now()进gmtModified对应字段 StrictFill.of("gmtModified", LocalDateTime.class, LocalDateTime.now()) )); } /** * 更新元对象字段填充（用于更新时对公共字段的填充） * * @param metaObject 元对象 */ @Override public void updateFill(MetaObject metaObject) { // 填充LocalDateTime.now()进gmtModified对应字段，这里是一行写法,中间参数可缩写为LocalDateTime::now this.strictUpdateFill(metaObject, "gmtModified", () -> LocalDateTime.now(), LocalDateTime.class); } }; } } |
然后调用insert方法或者update方法就会自动更新上去啦
