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  • Mybatis环境搭建及测试

    1、新建java project,导入相应jar包

    本次使用到的mybatis-3.2.7版本

    mybatis需要jar包:mybatis-3.2.7.jar、lib文件下的依赖jar

    mysql驱动jar包:mysql-connector-java-5.1.7.-bin.jar

    2、创建数据库

    数据库名:mybatis

    数据表:user

    3、配置mybaits核心配置文件SqlMapConfig.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>
        <!-- 和spring整合后 environments配置将废除-->
        <environments default="development">
            <environment id="development">
                <!-- type="JDBC" 代表使用JDBC的提交和回滚来管理事务 -->
                <transactionManager type="JDBC" />
                
                <!-- mybatis提供了3种数据源类型,分别是:POOLED,UNPOOLED,JNDI -->
                <!-- POOLED 表示支持JDBC数据源连接池 -->
                <!-- UNPOOLED 表示不支持数据源连接池 -->
                <!-- JNDI 表示支持外部数据源连接池 -->
                <dataSource type="POOLED">
                    <property name="driver" value="com.mysql.jdbc.Driver" />
                    <property name="url" value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8" />
                    <property name="username" value="root" />
                    <property name="password" value="mysqladmin" />
                </dataSource>
            
            </environment>
        </environments>
        
        <mappers>
            <mapper resource="User.xml"/>
        </mappers>
        
        
    </configuration>
    SqlMapConfig.xml放入项目中config源文件下

    4、创建对应数据表的java实体类

    User.java

    package cn.itheima.pojo;
    
    import java.util.Date;
    
    public class User {
        private int id;
        private String username;// 用户姓名
        private String sex;// 性别
        private Date birthday;// 生日
        private String address;// 地址
        
    
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getUsername() {
            return username;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public String getSex() {
            return sex;
        }
        public void setSex(String sex) {
            this.sex = sex;
        }
        public Date getBirthday() {
            return birthday;
        }
        public void setBirthday(Date birthday) {
            this.birthday = birthday;
        }
        public String getAddress() {
            return address;
        }
        public void setAddress(String address) {
            this.address = address;
        }
        @Override
        public String toString() {
            return "User [id=" + id + ", username=" + username + ", sex=" + sex
                    + ", birthday=" + birthday + ", address=" + address + "]";
        } 
    
    }

    5、创建对应的映射文件

    User.xml

    <?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">
    <!-- namespace:命名空间,做sql隔离 -->
    <mapper namespace="test">
        <!-- 
        id:sql语句唯一标识
        parameterType:指定传入参数类型(pojo类中对应的类型,不是数据库中的类型)
        resultType:返回结果集类型
        #{}:占位符,如果传入的类型是基本类型(string,long,double,int,boolean,float等),那么#{}中变量名称可以任意
         -->
        <select id="findUserById" parameterType="java.lang.Integer" resultType="cn.itheima.pojo.User">
            SELECT * FROM user WHERE id=#{id}
        </select>
        
        <!-- 
        如果返回的结果为集合,resultType中也是配置为集合中泛型的类型,即resultType="cn.itheima.pojo.User"
        ${}:拼接符,如果传入的类型是基本类型(string,long,double,int,boolean,float等),那么${}中变量名称必须是value
         -->
        <select id="findUserByUserName" parameterType="java.lang.String" resultType="cn.itheima.pojo.User">
            SELECT * FROM user WHERE username LIKE '%${value}%'
        </select>
        
        <!-- 
        如果传入的是pojo类型,则#{}中变量名称必须是pojo中对应的属性.属性.属性......
        如果要返回数据库自增主键,可以使用SELECT LAST_INSERT_ID()
         -->
        <insert id="insertUser" parameterType="cn.itheima.pojo.User">
            <!-- 执行SELECT LAST_INSERT_ID()数据库函数,返回自增的主键
                keyProperty:将返回的主键放入传入的参数的Id中保存(保存到user对象中的id属性)
                order:当前函数相对于insert语句的执行顺序,在insert前执行用BEFORE,在insert后执行用AFTER
                resultType:id的类型,也就是keyProperty中属性类型
             -->
            <selectKey keyProperty="id" order="AFTER" resultType="java.lang.Integer">
                SELECT LAST_INSERT_ID()
            </selectKey>
            INSERT INTO user (username,birthday,sex,address) VALUES (#{username},#{birthday},#{sex},#{address})
        </insert>
        
        <delete id="deleteUserById" parameterType="java.lang.Integer">
            DELETE FROM user WHERE id=#{id}
        </delete>
        
        <update id="updateUserById" parameterType="cn.itheima.pojo.User">
            UPDATE user SET  username=#{username} WHERE id=#{id}
        </update>
    </mapper>

    二、测试

    package mybatis0523;
    
    import java.io.InputStream;
    import java.util.Date;
    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 org.junit.Test;
    
    import cn.itheima.pojo.User;
    
    public class UserTest {
    
        @Test
        public void testFindUserById() throws Exception {
            String resource = "SqlMapConfig.xml";
            // 通过流将核心配置文件读取进来
            InputStream inputStream = Resources.getResourceAsStream(resource);
            // 通过核心配置文件创建会话工厂
            SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
            
            // 通过会话工厂创建会话
            SqlSession session = factory.openSession();
            
            User user = session.selectOne("test.findUserById", 1);
            System.out.println(user);
        }
        
        @Test
        public void testFindUserByUserName() throws Exception {
            String resource = "SqlMapConfig.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
            
            SqlSession session = factory.openSession();
            List<User> list = session.selectList("test.findUserByUserName", "王");
            System.out.println(list);
        }
        
        @Test
        public void testInsertUser() throws Exception {
            String resource = "SqlMapConfig.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
            
            SqlSession session = factory.openSession();
            User user = new User();
            user.setUsername("赵四");
            user.setBirthday(new Date());
            user.setSex("1");
            user.setAddress("北京昌平");
            System.out.println(user.getId());
            
            session.insert("test.insertUser", user);
            // mybatis中事务默认是开启的,所以在mybatis中不需要显式开启事务,只需要显式提交事务
            // 提交事务
            session.commit();
            System.out.println(user.getId());
        }
        
        @Test
        public void testDeleteUserById() throws Exception {
            String resource = "SqlMapConfig.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
            
            SqlSession session = factory.openSession();
            session.delete("test.deleteUserById", 27);
            session.commit();
        }
        
        @Test
        public void testUpdateUserById() throws Exception {
            String resource = "SqlMapConfig.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(inputStream);
            
            SqlSession session = factory.openSession();
            
            User user = new User();
            user.setUsername("赵四");
            user.setId(24);
            session.update("test.updateUserById", user);
            session.commit();
        }
    }

    简单的mybatis环境搭建和测试已完成,整个目录结构如下

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  • 原文地址:https://www.cnblogs.com/binaway/p/9138627.html
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