02MyBatis基本运行环境

MyBatis基本运行环境

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拷贝jar加入到项目中build path jar包

 

创建数据库的表及数据添加

USE [mybatis]
CREATE TABLE [dbo].[Material](
    [id] [int] IDENTITY(1,1) NOT NULL,
    [name] [varchar](50) NULL,
    [price] [int] NULL
)

 创建项目

创建实体类

package com.ahabest.bean;
public class Material {
    //成员变量
    private Integer id;
    private String name;
    private Integer price;
    //
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Integer getPrice() {
        return price;
    }
    public void setPrice(Integer price) {
        this.price = price;
    }
    @Override
    public String toString() {
        return "Material [id=" + id + ", name=" + name + ", price=" + price + "]";
    }
    public Material() {
        super();
    }
    public Material(Integer id, String name, Integer price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }
}

创建接口及映射

package com.ahabest.dao;
import java.util.List;
import com.ahabest.bean.Material;
public interface MaterialDao {
    List<Material> getAll();
}

<?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="test">
    <!-- id是找到SQL语句的唯一标识 -->
    <!-- parameter表示传入的参数类型 -->
    <!-- resultType返回值的类型 -->
    <select id="getAll" resultType="com.ahabest.bean.Material">
        SELECT * FROM Material
    </select>
    <select id="getById" parameterType="java.lang.Integer" resultType="com.ahabest.bean.Material">
        SELECT * FROM Material WHERE id = #{id}
    </select>
</mapper>

创建数据库配置及映射

jdbc.driver=com.microsoft.sqlserver.jdbc.SQLServerDriver
jdbc.url=jdbc:sqlserver://localhost:1433;DatabaseName=mybatis
jdbc.username=sa
jdbc.password=

<?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>
    <!-- 加载数据库的配置信息 -->
    <properties resource="jdbc.properties"></properties>
    <!-- mybatis的数据库环境 -->
    <environments default="Enviroment">
        <environment id="Enviroment">
            <!-- 事务管理 -->
            <transactionManager type="JDBC"></transactionManager>
            <!-- 数据源 -->
            <dataSource type="POOLED">
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>
    
    <mappers>
        <mapper resource="com/ahabest/dao/MaterialMapper.xml"/>
    </mappers>
    
</configuration>

读取数据库配置

package com.ahabest.dao.impl;
import java.io.InputStream;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import com.ahabest.bean.Material;
import com.ahabest.dao.MaterialDao;
public class MaterialDaoImpl implements MaterialDao {
    @Override
    public List<Material> getAll() {
        // 读取配置文件
        InputStream is = MaterialDaoImpl.class.getClassLoader().getResourceAsStream("mybatis-config.xml");
        //创建会话工厂
        SqlSessionFactory ssf = new SqlSessionFactoryBuilder().build(is);
        //开启会话
        SqlSession ss =ssf.openSession();
        //调用方法
        List<Material> lm = ss.selectList("test.getAll");
        Material m = ss.selectOne("test.getById",1);
        System.out.println(m);
        return lm;
    }
}

测试

package com.ahabest.test;
import java.util.List;
import com.ahabest.bean.Material;
import com.ahabest.dao.MaterialDao;
import com.ahabest.dao.impl.MaterialDaoImpl;
public class MaterialDaoTest {
    public static void main(String[] args) {
        MaterialDao md = new MaterialDaoImpl();
        List<Material> lm = md.getAll();
        for(Material m:lm) {
            System.out.println(m);
        }
    }
}