Idea搭建mybatis环境

1.创建工程

　　这里为了方便直接用一个模板

创建完毕

2.引入mybatis所需jar包

<dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.1</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>6.0.6</version>
    </dependency>

　　//测试相关
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
    </dependency>
　　//日志相关
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.25</version>
    </dependency>

3.创建一个实体类对应数据字段，并在数据库中创建对应的数据表

public class User implements Serializable {

    private static final long serialVersionUID = 8104961490512068314L;
    private int id;
    private String name;
    private String dept;
    private String phone;
    private String website;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDept() {
        return dept;
    }

    public void setDept(String dept) {
        this.dept = dept;
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getWebsite() {
        return website;
    }

    public void setWebsite(String website) {
        this.website = website;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", dept='" + dept + '\'' +
                ", phone='" + phone + '\'' +
                ", website='" + website + '\'' +
                '}';
    }

}

4.添加mysql配置文件，mybatis配置文件

mybatis-config.xml

 1 <configuration>
 2     <properties resource="mysql.properties"></properties>
 3 
 4 
 5     <typeAliases>
 6         <!-- 别名方式1，一个一个的配置 type中放置的是类的全路径，alias中放置的是类别名
 7         <typeAliase type="com.mybatis.demo.Entity.User" alias="UserBean"/> -->
 8         <!-- 别名方式2，自动扫描，将JAVA类的类名作为类的类别名 -->
 9         <!--<package name="com.mybatis.demo.Entity"/>-->
10         <typeAlias alias="User" type="com.mybatis.demo.Entity.User"/>
11     </typeAliases>
12 
13     <!-- 配置mybatis运行环境 -->
14     <environments default="development">
15         <environment id="development">
16             <!-- type="JDBC" 代表使用JDBC的提交和回滚来管理事务 -->
17             <transactionManager type="JDBC"/>
18 
19             <!-- mybatis提供了3种数据源类型，分别是：POOLED,UNPOOLED,JNDI -->
20             <!-- POOLED 表示支持JDBC数据源连接池 -->
21             <!-- UNPOOLED 表示不支持数据源连接池 -->
22             <!-- JNDI 表示支持外部数据源连接池 -->
23             <dataSource type="POOLED">
24                 <property name="driver" value="${jdbc.driver}"/>
25                 <property name="url" value="${jdbc.databaseurl}"/>
26                 <property name="username" value="${jdbc.username}"/>
27                 <property name="password" value="${jdbc.password}"/>
28             </dataSource>
29         </environment>
30     </environments>
31 
32 
33     <mappers>
34         <!-- 映射文件方式1，一个一个的配置-->
35         <mapper resource="mapper/UserMapper.xml"/>
36         <!-- 映射文件方式2，自动扫描包内的Mapper接口与配置文件 -->
37         <!--<package name="com.mybatis.demo"/>-->
38     </mappers>
39 
40 </configuration>

mysql.properties:

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1 jdbc.databaseurl=jdbc:mysql:///javaweb_community?serverTimezone=UTC&characterEncoding=utf8&useUnicode=true&useSSL=false
2 jdbc.driver=com.mysql.cj.jdbc.Driver
3 jdbc.username=root
4 jdbc.password=
5 jdbc.maxActive=100
6 jdbc.maxWait=5000
7 jdbc.filters=wall,stat

ps: 这里mysql的jar包版本在6.0以上的和以前版本有一点差异。

5.添加mapper类接口以及对应mapper.xml

 1 package com.mybatis.demo.mapper;
 2 
 3 
 4 import com.mybatis.demo.Entity.User;
 5 
 6 public interface UserMapper {
 7 
 8     User GetUserByID(Integer id) throws Exception;


10 
11 }

 1 <mapper namespace="com.mybatis.demo.mapper.UserMapper">
 2     <!-- 自定义返回结果集 -->
 3     <resultMap id="userMap" type="User">
 4         <id property="id" column="id" javaType="java.lang.Integer"></id>
 5         <result property="username" column="username" javaType="java.lang.String"></result>
 6         <result property="password" column="password" javaType="java.lang.String"></result>
 7         <result property="account" column="account" javaType="java.lang.Double"></result>
 8     </resultMap>
 9 
10 
11     <select id="GetUserByID" parameterType="int" resultMap="userMap">
12         select * from `user` where id = #{id}
13     </select>
14 </mapper>

6.在配置文件中注册该xml

7.编写单元测试，通过sqlSession 操作数据库

 1 public class AppTest 
 2 {
 3     /**
 4      * Rigorous Test :-)
 5      */
 6     @Test
 7     public void shouldAnswerWithTrue()
 8     {
 9 
10         try {
11             //使用MyBatis提供的Resources类加载mybatis的配置文件
12             Reader reader = Resources.getResourceAsReader("mybatis/mybatis-config.xml");
13             //构建sqlSession的工厂
14             SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(reader);
15 
16             SqlSession session= sessionFactory.openSession();
17             UserMapper mapper=session.getMapper(UserMapper.class);
18             User user= mapper.GetUserByID(1);
19             System.out.println(user.toString());
20 
21             session.commit();
22         } catch (Exception e) {
23             e.printStackTrace();
24         }
25 
26     }
27 }

Idea搭建mybatis环境

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