MyBatis--2

原創

炽烈之心

2020-02-20 23:20

新建maven項目，在pom.xml導入mybatis jar包和mysql jar包

mybatis jar包

mysql jar包

在resources建大配置

<?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">

<!--根節點，xml只能有一個-->
<configuration>
    <properties resource="jdbc.properties">

    </properties>
    <!--別名-->
<typeAliases>
    <!-- <typeAlias type="cn.bdqn.entity.Studentinfo" alias="Studentinfo"></typeAlias>-->
<package name="cn.bdqn.entity"></package>
</typeAliases>





    <!--一個environments有N個environments-->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"></transactionManager>
            <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=""/>
            </dataSource>
        </environment>
    </environments>
    <mappers>

        <mapper resource="cn/bdqn/dao/IStudentDao.xml"></mapper>
    </mappers>
</configuration>

DAO下建小配置

<?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="cn.bdqn.dao.IStudentDao">

    <select id="getAll" resultType="Studentinfo">
SELECT * FROM studentinfo
    </select>

   <!--getstudentByid-->
    <select id="getstudentByid" resultType="Studentinfo">
        SELECT * FROM studentinfo WHERE stuid=#{stuId}
    </select>

    <insert id="insert">

        INSERT INTO studentinfo(stuName,stuAge) values(#{stuName},#{stuAge})
    </insert>

    <!--//修改-->
    <update id="upd">
        UPDATE studentinfo SET stuName=#{stuName},
                                stuAge=#{stuAge}
                                where stuId=#{stuId}
    </update>

    <!--刪除-->
    <delete id="del">
        DELETE FROM studentinfo WHERE stuid=#{studentId}
    </delete>

</mapper>

工具類mybatisutil

public class MyBatisUtil {

    private static SqlSessionFactory Factory;
    private static String path= "Mybatis-config.xml";
    public SqlSession getsql(){
        try {
            InputStream is= Resources.getResourceAsStream(path);
          Factory= new SqlSessionFactoryBuilder().build(is);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return  Factory.openSession();
    }

}

測試類

@Test
public void TestAll(){
    String path= "Mybatis-config.xml";
    try {
        InputStream is= Resources.getResourceAsStream(path);
        SqlSessionFactory factory= new SqlSessionFactoryBuilder().build(is);

        SqlSession session=factory.openSession();

        List<Studentinfo> list = session.selectList("getAll");
        for (Studentinfo item: list) {
            System.out.println(item.getStuName());
        }
        session.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}