十一、持久层框架（MyBatis）

把xml方式的CRUD修改为注解方式

之前在xml中配置，是在<mapper></mapper>标签下写CRUD

<mapper namespace="com.demo.pojo">
    <select id="listProduct" parameterType="Product">
    select * from product_table
    </select>
    <insert id="addProduct" parameterType="Product"> 
        insert into product_table (name) values (#{name})
    </insert>
    <update id="updateProduct" parameterType="Product">
        update product_table set name=#{name} where id=#{id}
    </update>
    <delete id="deleteProduct" parameterType="Product">
        delete from product_table where id=#{id}
    </delete>
<mapper>

1、因此要增加Mapper接口方式实现

比如要把之前映射文件Product.xml配置方式变成注解方式的，新建一个ProductMapper接口，并在接口中声明的方法上，加上注解就可以（也就是把SQL语句从xml上移到了注解上来）

package com.demo.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.demo.pojo.Product;

public interface ProductMapper{
    @Insert(" inert into product_table (name) values (#{name}) ")
    public int add(Product product);
    @Delete(" delete from product_table where id=#{id} ")
    public void delete(int id);
    @Select(" select * from product_table where id=#{id} ")
    public Product select(int id);
    @Update(" update product_table set name=#{name} where id=#{id} ")
    public int update(Product product);
    @Select(" select * from product_table ")
    public List<Product> selectAll();
}

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