JAVA 框架 / MYBATIS / MYBATIS系列教材 （二）- 基础 - CRUD侵删

步骤 4 : 配置文件Category.xml   

首先一次性修改配置文件Category.xml，提供CRUD对应的sql语句。

<?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.how2java.pojo">
        <insert id="addCategory" parameterType="Category" >
            insert into category_ ( name ) values (#{name})   
        </insert>
         
        <delete id="deleteCategory" parameterType="Category" >
            delete from category_ where id= #{id}  
        </delete>
         
        <select id="getCategory" parameterType="_int" resultType="Category">
            select * from   category_  where id= #{id}   
        </select>
 
        <update id="updateCategory" parameterType="Category" >
            update category_ set name=#{name} where id=#{id}   
        </update>
        <select id="listCategory" resultType="Category">
            select * from   category_     
        </select>    
    </mapper>

步骤 5 : 增加   
步骤 6 : 删除   

删除id=6的对象

Category c = new Category();

c.setId(6);

session.delete("deleteCategory",c);

deleteCategory对应删除的sql语句

<delete id="deleteCategory" parameterType="Category" >

delete from category_ where id= #{id}

</delete>

package com.how2java;
 
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
 
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 
import com.how2java.pojo.Category;
 
public class TestMybatis {
 
    public static void main(String[] args) throws IOException {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession session = sqlSessionFactory.openSession();
 
        Category c = new Category();
        c.setId(6);
        session.delete("deleteCategory",c);
         
        listAll(session);
         
        session.commit();
        session.close();
 
    }
 
    private static void listAll(SqlSession session) {
        List<Category> cs = session.selectList("listCategory");
        for (Category c : cs) {
            System.out.println(c.getName());
        }
    }
}

刪除id=6的category對象后，执行listAll函数

 然而数据库为：

 id=1，2，3的category去哪儿了?

步骤 7 : 获取   
步骤 8 : 修改   
步骤 9 : 查询所有