Hello mybatis

系统管理员 2023-06-02 03:19 3阅读 0赞

idea玩mybatis，终于搞出个hello mybatis。记录下过程，备忘。

很详细的一篇：[SSM框架——详细整合教程（Spring+SpringMVC+MyBatis） ][SSM_Spring_SpringMVC_MyBatis_]

1、person表

CREATE TABLE `person` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `name` varchar(20) CHARACTER SET gb2312 NOT NULL,
      `password` varchar(20) CHARACTER SET latin1 NOT NULL,
      `sex` varchar(2) CHARACTER SET gb2312 DEFAULT NULL,
      `email` varchar(30) CHARACTER SET latin1 DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=MyISAM AUTO_INCREMENT=13 DEFAULT CHARSET=utf8;

2、数据模型（bean）Person.java

package model;
    
    /**
     * Created by DANNY on 2016/12/30.
     */
    public class Person {
        private Integer id;
        private String name;
        private String passWord;
        private String sex;
        private String email;
    
        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 String getPassWord() {
            return passWord;
        }
    
        public void setPassWord(String passWord) {
            this.passWord = passWord;
        }
    
        public String getSex() {
            return sex;
        }
    
        public void setSex(String sex) {
            this.sex = sex;
        }
    
        public String getEmail() {
            return email;
        }
    
        public void setEmail(String email) {
            this.email = email;
        }
    }

3、Person的mapper，xml配置文件

<?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="model.PersonMapper">
        <select id="queryPersonById" parameterType="int" resultType="Person"
                useCache="false">
            <![CDATA[
            select * from person where id = #{id}
            ]]>
        </select>
    </mapper>

4、mybatis-config.xml配置文件

alias: 别名，第3步的resultType=“Person”，就是通过这里映射

<?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>
            <typeAlias type="model.Person" alias="Person" />
        </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://127.0.0.1:3306/test" />
                    <property name="username" value="root" />
                    <property name="password" value="test" />
                </dataSource>
            </environment>
        </environments>
    
        
        <mappers>
            <mapper resource="model/PersonMapper.xml" />
        </mappers>
    
    </configuration>

5、测试类PersonTest.java

selectOne第一个参数，为第3步中mapper的namespace.id

import model.Person;
    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 java.io.Reader;
    
    /**
     * Created by DANNY on 2016/12/30.
     */
    public class PersonTest {
        private static SqlSessionFactory sqlSessionFactory;
        private static Reader reader;
    
        static {
            try {
                reader = Resources.getResourceAsReader("mybatis-config.xml");
                sqlSessionFactory = new  SqlSessionFactoryBuilder().build(reader);
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    
        public static SqlSessionFactory getSessionFactory(){
            return sqlSessionFactory;
        }
    
        public static void main(String[] args){
            SqlSession session = sqlSessionFactory.openSession();
            try {
                Person person = (Person)session.selectOne("model.PersonMapper.queryPersonById",1);
                System.out.println(person.getEmail());
            }catch (Exception e){
                e.printStackTrace();
            }finally {
                session.close();
            }
        }
    }

运行测试类的main方法，可从数据库查询出id=1的记录

danny.yao@13.com

Process finished with exit code 0

6、pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>danny.yao.mybatisLearning</groupId>
        <artifactId>mybatisLearning</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <dependencies>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>3.4.1</version>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.6</version>
            </dependency>
        </dependencies>
        <build>
            <resources>
                <resource>
                    <directory>src/main/java</directory>
                    <includes>
                        <include>**/*.xml</include>
                    </includes>
                    <filtering>true</filtering>
                </resource>
            </resources>
        </build>
    </project>

转载于:https://www.cnblogs.com/dannyyao/p/6239074.html

[SSM_Spring_SpringMVC_MyBatis_]: http://blog.csdn.net/gebitan505/article/details/44455235