MyBatic CRUD增删改查

Mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <package name="com.how2java.pojo"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/how2java?characterEncoding=UTF-8"/>
                <property name="username" value="root"/>
                <property name="password" value="admin"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/how2java/pojo/Category.xml"/>
    </mappers>
</configuration>

Category.xml

<?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>

Category.java

package com.how2java.pojo;

public class Category {
    private int id;
    private String name;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }

}

TestMybatis.java

package com.how2java.pojo;

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;

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();

        //插入
//        Category c = new Category();
//        c.setName("新增加的Category");
//        session.insert("addCategory",c);

        //删除
//        Category c = new Category();
//        c.setId(5);
//        session.delete("deleteCategory",c);

        //查询单行
//        Category c= session.selectOne("getCategory",3);
//        System.out.println(c.getName());

        //修改
//        Category c= session.selectOne("getCategory",3);
//        c.setName("修改了的Category名称");
//        session.update("updateCategory",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());
        }
    }
}