Mybatis 基础_注解

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 class="com.how2java.mapper.CategoryMapper"/>
    </mappers>
</configuration>

CategoryMapper.java

package com.how2java.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.how2java.pojo.Category;

public interface CategoryMapper {

    @Insert(" insert into category_ ( name ) values (#{name}) ")
    public int add(Category category);

    @Delete(" delete from category_ where id= #{id} ")
    public void delete(int id);

    @Select("select * from category_ where id= #{id} ")
    public Category get(int id);

    @Update("update category_ set name=#{name} where id=#{id} ")
    public int update(Category category);

    @Select(" select * from category_ ")
    public List<Category> list();
}

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;

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.mapper.CategoryMapper;
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();
        CategoryMapper mapper = session.getMapper(CategoryMapper.class);

//        add(mapper);
//        delete(mapper);
//        get(mapper);
//        update(mapper);
        listAll(mapper);

        session.commit();
        session.close();

    }

    private static void update(CategoryMapper mapper) {
        Category c= mapper.get(7);
        c.setName("修改了的Category名称");
        mapper.update(c);
        listAll(mapper);
    }

    private static void get(CategoryMapper mapper) {
        Category c= mapper.get(7);
        System.out.println(c.getName());
    }

    private static void delete(CategoryMapper mapper) {
        mapper.delete(2);
        listAll(mapper);
    }

    private static void add(CategoryMapper mapper) {
        Category c = new Category();
        c.setName("新增加的Category");
        mapper.add(c);
        listAll(mapper);
    }

    private static void listAll(CategoryMapper mapper) {
        List<Category> cs = mapper.list();
        for (Category c : cs) {
            System.out.println(c.getId()+":"+c.getName());
        }
    }
}