MyBatis快速入门——第六章、MyBatis拦截器接口(二)
目录
MyBatis快速入门——第六章、MyBatis拦截器接口(二)
1、修改返回值
2、创建【CamelHumpInterceptor】 文件
1、修改返回值
代码语言:javascript复制<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.item.mapper.ProductMapper">
<select id="GetInfo" resultType="java.util.Map">
select * from product
<if test="productName!=null or productType!=null or productColor!=null ">
where 1=1
</if>
<!-- 模糊查询 -->
<if test="productName!=null">
and productName like "%${productName}%"
</if>
<!-- 类型筛选 -->
<if test="productType!=null">
and productType="${productType}"
</if>
<!-- 颜色筛选 -->
<if test="productColor!=null">
and productColor="${productColor}"
</if>
</select>
<update id="UpdateById">
update product set productTitle = "${productTitle}" where id=#{id}
</update>
</mapper>
2、创建【CamelHumpInterceptor】 文件
代码语言:javascript复制package com.item.interceptor;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.plugin.*;
import java.lang.reflect.Method;
import java.util.Properties;
@Intercepts({
@Signature(
type = Executor.class,//指定要拦截的接口
method = "update",//设置拦截接口中的方法名
args = {MappedStatement.class,Object.class}//设置拦截方法的参数类型数组
)
})
public class MyBatisInterceptor implements Interceptor {
/**
* 获取被拦截器拦截对象的相关信息
* @param invocation
* @return
* @throws Throwable
*/
@Override
public Object intercept(Invocation invocation) throws Throwable {
//拦截目标
Object target = invocation.getTarget();
System.out.println("目标:" target);
//获取被拦截对象执行的方法
Method method = invocation.getMethod();
System.out.println("方法:" method.getName());
//获取执行目标的中参数
Object[] args = invocation.getArgs();
for (Object o : args) {
System.out.println("参数:" o);
}
Object proceed = invocation.proceed();
System.out.println("继续:" proceed);
return proceed;
}
/**
* 获取当前拦截对象
* @param target
* @return
*/
@Override
public Object plugin(Object target) {
System.out.println("当前拦截对象" target);
return Plugin.wrap(target,this);
}
/**
* 获取拦截器插件中的参数值
* @param properties
*/
@Override
public void setProperties(Properties properties) {
System.out.println("参数0:" properties.get("prop0"));
System.out.println("参数1:" properties.get("prop1"));
}
}
执行返回效果: