Mybatis框架搭建和简单的增删改查

一、导包：

oricle和mybatis的包

二、写一个实体类，生成get，set，tostring。

package com.model;

public class TUsers {
    private Integer id;
    private String username;
    private String password;
    
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    @Override
    public String toString() {
        return "TUsers [id=" + id + ", username=" + username + ", password=" + password + "]";
    }
    
}

三、写一个总得配置文件

<?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>
    <!-- 引入外部属性文件,datasource里面可以使用${} -->
    <properties resource="db.properties"></properties>
    <!-- 定义一个别名组 -->
    <typeAliases>
        <!-- <typeAlias type="com.model.TUsers" alias="q"/> -->
        <!-- package有一个默认值,别名就可以使用类的首字母小写 -->
        <package name="com.model"/>
    </typeAliases>
    
    <!-- mybatis的环境组 -->
    <environments default="test">
        <environment id="test">
            <!-- mybatis支持的事务:
             JDBC:数据源自己的事务管理
             MANAGE(托管),不支持tomcat,一般用在大型的商业服务器,weblogic,jboss -->
            <transactionManager type="JDBC">
                
            </transactionManager>
            <!-- 数据库连接 -->
            <dataSource type="POOLED">
                <property name="driver" value="oracle.jdbc.OracleDriver"></property>
                <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"></property>
                <property name="username" value="lyh"></property>
                <property name="password" value="lyh"></property>
            </dataSource>
        </environment>
    </environments>
    <!-- 把实体类对应的配置文件映射进来 -->
    <mappers>
        <mapper resource="com/dao/TuserMapper.xml"></mapper>
    </mappers>
    
</configuration>

四、写一个实体类的配置文件

<?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="com.dao.TuserMapper">
    <!-- 实体类属性名和列名如果不一致的处理-->
    <resultMap type="tUsers" id="uses">
        <result property="username" column="username"/>
    </resultMap>
    
    <!-- 全表查询 -->
    <select id="list" resultType="tUsers">
        select * from t_users
    </select>
    <!-- 添加 -->
    <insert id="addUser" parameterType="tUsers">
        insert into t_users values(sq_mybatis.nextval,#{username},#{password})
    </insert>
    <!-- 删除 -->
    <delete id="delUser" parameterType="Integer">
        delete t_users t where t.id=#{id}
    </delete>
    <!-- 修改 -->
    <update id="updateUser" parameterType="tUsers">
        update t_users t set t.username=#{username},
        t.password=#{password} where t.id=#{id}
    </update>
</mapper>

五、建一个工具类,用来获取sqlsession

package com.util;

import java.io.IOException;
import java.io.InputStream;

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 MybatisUtil {
    private static SqlSessionFactory ssf;
    private static SqlSession ss;
    public static SqlSession getSqlSession(){
        InputStream in = null;
        
        try { 
            in = Resources.getResourceAsStream("mybatis.xml");
            
            ssf = new SqlSessionFactoryBuilder().build(in);
            ss = ssf.openSession();
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return ss;
    }

    /*
     public static void main(String[] args){
        System.out.println(getSqlSession());
    }
    */
}

六、新建一个测试用例，测试一package com.uti

import static org.junit.Assert.*;

import java.util.List;

import org.apache.ibatis.session.SqlSession;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.model.TUsers;

public class JTest {
    private SqlSession ss;
    @Before
    public void setUp() throws Exception {
        ss = MybatisUtil.getSqlSession();
    }

    @After
    public void tearDown() throws Exception {
        ss.commit();
    }

    
    public void test() {//查询所有
        List<TUsers> list = ss.selectList("com.dao.TuserMapper.list");
        for(TUsers u :list){
            System.out.println(u);
        }
    }
    
    public void addUser(){//添加
        TUsers t = new TUsers();
        t.setUsername("lihaha");
        t.setPassword("123123");
        int i = ss.insert("com.dao.TuserMapper.addUser", t);
        System.out.println(i);
    }
    
    public void delUser(){ //删除
        int i = ss.delete("com.dao.TuserMapper.delUser", 2);
        System.out.println(i);
    }
    @Test

    public void updateUser(){ //修改
        TUsers t = new TUsers();
        t.setId(21);
        t.setUsername("liweixi");
        t.setPassword("777777");
        int i = ss.update("com.dao.TuserMapper.updateUser", t);
        System.out.println(i);
    }
}

六、结果显示

查询所有的结果：

添加的结果：

修改的结果：

删除的结果：