mybatisInterceptor对UpdateTime自动处理的实现方法

package com.zb.iscrm.annotation;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * @Auther: 杨红星
 * @Date: 2018/11/28 09:38
 * @Description:
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD})
public @interface UpdateTime {
 String value() default "";
}

package com.zb.iscrm.mybatisInterceptor;

import com.zb.iscrm.annotation.UpdateTime;
import com.zb.iscrm.utils.DateUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.*;

import java.lang.reflect.Field;
import java.util.Properties;

/**
 * @Auther: 杨红星
 * @Date: 2018/11/28 09:41
 * @Description: mybatis插件 用于执行Update时将当前时间加入
 */
@Slf4j
@Intercepts({ @Signature(type = Executor.class, method = "update", args = { MappedStatement.class, Object.class }) })
public class UpdateTimeInterceptor implements Interceptor {

 @Override
 public Object intercept(Invocation invocation) throws Throwable {
  MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
  // 获取 SQL 命令
  SqlCommandType sqlCommandType = mappedStatement.getSqlCommandType();
  // 获取参数
  Object parameter = invocation.getArgs()[1];
  if (parameter != null) {
   // 获取成员变量
   Field[] declaredFields = parameter.getClass().getDeclaredFields();
   for (Field field : declaredFields) {
    if (field.getAnnotation(UpdateTime.class) != null) { // update 语句插入 updateTime
     if (SqlCommandType.INSERT.equals(sqlCommandType) || SqlCommandType.UPDATE.equals(sqlCommandType)) {
      field.setAccessible(true);
      if (field.get(parameter) == null) {
       field.set(parameter, DateUtils.dateTimeNow(DateUtils.YYYY_MM_DD_HH_MM_SS));
      }
     }
    }
   }
  }
  //同样的方式也可以在这里添加create_time或者是id的生成等处理
  
  return invocation.proceed();
 }

 @Override
 public Object plugin(Object target) {
  return Plugin.wrap(target, this);
 }

 @Override
 public void setProperties(Properties properties) {
 }
}

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