实现字段自动填充功能

nxhs-common/src/main/java/cc/yunxi/common/config/MyBatisConfig.java

@@ -1,15 +1,20 @@
 package cc.yunxi.common.config;
 
 import com.baomidou.mybatisplus.annotation.DbType;
+import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
 import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
+import org.apache.ibatis.reflection.MetaObject;
 import org.mybatis.spring.annotation.MapperScan;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
+import java.time.LocalDateTime;
+import java.util.Optional;
+
 @Configuration
 @ConditionalOnClass({MybatisPlusInterceptor.class, BaseMapper.class})
 @MapperScan(basePackages = "cc.yunxi.mapper")
@@ -24,4 +29,25 @@ public class MyBatisConfig {
         interceptor.addInnerInterceptor(paginationInnerInterceptor);
         return interceptor;
     }
+
+    @Bean
+    @ConditionalOnMissingBean
+    public MetaObjectHandler metaObjectHandler() {
+        // 通用字段自动填充实现
+        return new MetaObjectHandler() {
+            @Override
+            public void insertFill(MetaObject metaObject) {
+                String userId = (String) getFieldValByName("userId", metaObject);
+                // 有值则不覆盖、无值自动填充、填充null时不填充
+                this.strictInsertFill(metaObject, "createTime", LocalDateTime::now, LocalDateTime.class);
+                this.strictInsertFill(metaObject, "creator", () -> userId, String.class);
+            }
+
+            @Override
+            public void updateFill(MetaObject metaObject) {
+                this.strictUpdateFill(metaObject, "updateTime", LocalDateTime::now, LocalDateTime.class);
+            }
+        };
+    }
+
 }

nxhs-common/src/main/java/cc/yunxi/common/domain/BaseDO.java

@@ -0,0 +1,47 @@
+package cc.yunxi.common.domain;
+
+import com.baomidou.mybatisplus.annotation.FieldFill;
+import com.baomidou.mybatisplus.annotation.TableField;
+import com.baomidou.mybatisplus.annotation.TableLogic;
+import lombok.Data;
+import org.apache.ibatis.type.JdbcType;
+
+import java.io.Serializable;
+import java.time.LocalDateTime;
+
+@Data
+public abstract class BaseDO implements Serializable {
+
+    private static final long serialVersionUID = -1L;
+
+    /**
+     * 创建时间
+     */
+    @TableField(fill = FieldFill.INSERT)
+    private LocalDateTime createTime;
+    /**
+     * 最后更新时间
+     */
+    @TableField(fill = FieldFill.INSERT_UPDATE)
+    private LocalDateTime updateTime;
+    /**
+     * 创建者，目前使用 SysUser 的 id 编号
+     *
+     * 使用 String 类型的原因是，未来可能会存在非数值的情况，留好拓展性。
+     */
+    @TableField(fill = FieldFill.INSERT, jdbcType = JdbcType.VARCHAR)
+    private String creator;
+    /**
+     * 更新者，目前使用 SysUser 的 id 编号
+     *
+     * 使用 String 类型的原因是，未来可能会存在非数值的情况，留好拓展性。
+     */
+    @TableField(fill = FieldFill.INSERT_UPDATE, jdbcType = JdbcType.VARCHAR)
+    private String updater;
+    /**
+     * 是否删除
+     */
+    @TableLogic
+    private Boolean deleted;
+
+}

nxhs-service/src/main/java/cc/yunxi/domain/po/Test.java

@@ -1,5 +1,6 @@
 package cc.yunxi.domain.po;
 
+import cc.yunxi.common.domain.BaseDO;
 import com.baomidou.mybatisplus.annotation.IdType;
 import com.baomidou.mybatisplus.annotation.TableId;
 import com.baomidou.mybatisplus.annotation.TableName;
@@ -13,23 +14,17 @@ import java.io.Serializable;
 @EqualsAndHashCode(callSuper = false)
 @Accessors(chain = true)
 @TableName("test")
-public class Test implements Serializable  {
+public class Test extends BaseDO {
 
-    private static final long serialVersionUID = 1L;
-
-    /**
-     * 购物车条目id
-     */
     @TableId(value = "id", type = IdType.AUTO)
     private Integer id;
 
-    /**
-     * 用户id
-     */
+
     private String name;
 
-    /**
-     * sku商品id
-     */
+
     private Integer age;
+
+
+    private String userId;
 }

nxhs-service/src/test/java/cc/yunxi/NxhsApplicationTest.java

@@ -13,6 +13,7 @@ import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;
 
 import javax.annotation.Resource;
+import java.time.LocalDateTime;
 import java.util.List;
 
 @SpringBootTest
@@ -26,8 +27,12 @@ public class NxhsApplicationTest {
 
     @Test
     void test01() {
-        List<cc.yunxi.domain.po.Test> list = testService.list();
-        System.out.println(list);
+//        List<cc.yunxi.domain.po.Test> list = testService.list();
+//        System.out.println(list);
+        cc.yunxi.domain.po.Test test = new cc.yunxi.domain.po.Test();
+//        test.setAge(19).setName("冲哥").setCreateTime(LocalDateTime.of(2024,3,1,16,12,14));
+        test.setAge(20).setName("冲哥").setUserId("666");
+        testService.save(test);
     }