MyBatis的CRUD

MyBatis的增刪改查，特色是隻要定義接口，不用實現方法，sql語句在xml中配置，很是方便

文件結構

接口UserDao

import com.jinke.domain.QueryVo; import com.jinke.domain.User; import java.util.List; public interface UserDao { List<User> findAll(); void saveUser(User user); void updateUser(User user); void deleteUser(Integer userId); User findById(Integer userId); List<User> findByName(String username); int findTotal(); List<User> findUserByVo(QueryVo vo); }

實體類User

import java.io.Serializable; import java.util.Date; public class User implements Serializable { private Integer id; private String username; private String address; private String sex; private Date birthday; 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 getAddress() { return address; } public void setAddress(String address) { this.address = address; } 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; } @Override public String toString() { return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", address='" + address + '\'' +
                ", sex='" + sex + '\'' +
                ", birthday=" + birthday +
                '}'; } }

實體封裝

public class QueryVo { private User user; public User getUser() { return user; } public void setUser(User user) { this.user = user; } }

SqlMapConfig.xml

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 2.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--配置環境-->
    <environments default="mysql">
        <!--配置mysql的環境-->
        <environment id="mysql">
            <!--配置事務-->
            <transactionManager type="JDBC"></transactionManager>
            <!--配置鏈接池-->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useUnicode=true&amp;characterEncoding=utf8"/>
                <property name="username" value="root"/>
                <property name="password" value="1234"/>
            </dataSource>
        </environment>
    </environments>
    <!--配置映射文件的位置-->
    <mappers>
        <mapper resource="com/jinke/dao/UserDao.xml"/>
    </mappers>
</configuration>

sql語句

<?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.jinke.dao.UserDao">

    <!--解決實體屬性和表字段不一致的問題-->
    <resultMap id="userMap" type="com.jinke.domain.User">
        <id property="id" column="id"/>
        <result property="username" column="username"/>
        <result property="address" column="address"/>
        <result property="sex" column="sex"/>
        <result property="birthday" column="birthday"/>
    </resultMap>

    <select id="findAll" resultMap="userMap"> select * from user; </select>

  <!-- <select id="findAll" resultType="com.jinke.domain.User"> select * from user; </select>-->

    <insert id="saveUser" parameterType="com.jinke.domain.User"> /*配置插入操做後，獲取插入數據的id*/ <selectKey keyProperty="id" keyColumn="id" resultType="int" order="AFTER"> select last_insert_id(); </selectKey> insert into user(username,address,sex,birthday) values(#{username},#{address},#{sex},#{birthday}); </insert>

    <update id="updateUser" parameterType="com.jinke.domain.User"> update user set username = #{username},address = #{address},sex = #{sex},birthday = #{birthday} where id = #{id}; </update>

    <delete id="deleteUser" parameterType="Integer"> delete from user where id = #{uid}; </delete>

    <select id="findById" parameterType="Integer" resultType="com.jinke.domain.User"> select * from user where id = #{uid}; </select>

    <select id="findByName" parameterType="String" resultType="com.jinke.domain.User"> select * from user where username like #{name} /*select * from user where username like '%${value}%'*/ </select>

    <select id="findTotal" resultType="Integer"> select count(id) from user; </select>

    <!--查詢類型封裝-->
    <select id="findUserByVo" parameterType="com.jinke.domain.QueryVo" resultType="com.jinke.domain.User"> select * from user where username like #{user.username} </select>
</mapper>

測試類

import com.jinke.dao.UserDao; import com.jinke.domain.QueryVo; import com.jinke.domain.User; 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.After; import org.junit.Before; import org.junit.Test; import java.io.InputStream; import java.util.Date; import java.util.List; public class MyBatisTest { private InputStream in; private SqlSession sqlSession; private UserDao userDao; @Before public void init() throws Exception { in = Resources.getResourceAsStream("SqlMapConfig.xml"); SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder(); SqlSessionFactory factory = builder.build(in); sqlSession = factory.openSession(); userDao = sqlSession.getMapper(UserDao.class); } @After public void destroy() throws Exception { sqlSession.commit(); sqlSession.close(); in.close(); } @Test public void testFindAll() { List<User> users = userDao.findAll(); for (User user : users) { System.out.println(user); } } @Test public void testSave() { User user = new User(); user.setUsername("李四"); user.setAddress("上海"); user.setBirthday(new Date()); user.setSex("男"); userDao.saveUser(user); } @Test public void testUpdate() { User user = new User(); user.setId(2); user.setUsername("王五"); user.setAddress("廣州"); user.setBirthday(new Date()); user.setSex("男"); userDao.updateUser(user); } @Test public void testDelete() { userDao.deleteUser(2); } @Test public void testFindOne() { User user = userDao.findById(1); System.out.println(user); } @Test public void testFindByName() { List<User> users = userDao.findByName("%張%"); for (User user : users) { System.out.println(user); } } @Test public void testFindTotal() { int total = userDao.findTotal(); System.out.println("total" + total); } @Test public void testFindByVo() { QueryVo vo = new QueryVo(); User user = new User(); user.setUsername("%張%"); vo.setUser(user); List<User> users = userDao.findUserByVo(vo); for (User u : users) { System.out.println(u); } } }

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