IDEA构建一个mybatis项目

目录结构如下：

在pom.xml中配置需要的jar包

  <dependencies>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.3.0</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.29</version>
    </dependency>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
        <scope>test</scope>
    </dependency>
  <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>1.7.12</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.12</version>
    </dependency>
</dependencies>

接下来新建config.properties配置文件将JDBC连接所需参数配置进去

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis
username=root
password=123456

建一个model，Person.java

public class Person {

    private int id;
    private String userName ;
    private int age ;
    private String mobilePhone ;
    public  Person(){}
    public Person(int id,String userName, int age, String mobilePhone) {
        this.id = id;
        this.userName = userName;
        this.age = age;
        this.mobilePhone = mobilePhone;
    }

    public String getUserName() {
        return userName;
    }
    public int getId() {
        return id;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getMobilePhone() {
        return mobilePhone;
    }

    public void setMobilePhone(String mobilePhone) {
        this.mobilePhone = mobilePhone;
    }

    @Override
    public String toString() {
        return "Person{" +
                "userName='" + userName + '\'' +
                ", age=" + age +
                ", mobilePhone='" + mobilePhone + '\'' +
                '}';
    }
}

配置mybatis-config.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>
    <properties resource="config.properties"/>
    <typeAliases>
        <typeAlias type="model.Person" alias="Person"/>
    </typeAliases>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="mapper/Person.xml"/>
    </mappers>
</configuration>

配置日志打印log4j.properties

log4j.rootLogger=debug, stdout, R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%5p - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=firestorm.log

log4j.appender.R.MaxFileSize=100KB
log4j.appender.R.MaxBackupIndex=1

log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n

log4j.logger.com.codefutures=DEBUG

配置mapper

<?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">
    <insert id="insertPerson" parameterType="Person" >
   INSERT INTO PERSON(ID,USERNAME,AGE,MOBILEPHONE)VALUES (#{id},#{userName},#{age},#{mobilePhone})
    </insert>

    <select id="queryById" parameterType="int" resultType="Person">
        SELECT * FROM PERSON WHERE ID=#{id}
    </select>

    <update id="updatePerson">
        UPDATE PERSON SET USERNAME=#{userName},AGE=#{age},MOBILEPHONE=#{mobilePhone} WHERE ID=#{id}
    </update>
</mapper>

写一个工具类来获取SqlSessionFactory和SqlSession

public class MybatisUtil {
    private final  static SqlSessionFactory sqlSessionFactory;

    static {
        String resource="mybatis-config.xml";
        Reader reader =null;
        try {
            reader = Resources.getResourceAsReader(resource);
        } catch (IOException e) {
            e.printStackTrace();
        }
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        }

    /**
     * 获取SqlSessionFactory
     * @return SqlSessionFactory
     */
    public static SqlSessionFactory getSqlSessionFactory(){
        return sqlSessionFactory;
    }

    /**
     * 获取SqlSession
     * @return SqlSession
     */
    public static SqlSession getSqlSession(){
        return sqlSessionFactory.openSession();
    }
    /**
     * 关闭SqlSession
     */
    public  static void closeSession(SqlSession sqlSession){
        if (sqlSession!=null)
            sqlSession.close();
    }
    }

最后测试

public class UserTest {

    SqlSession sqlSession ;
    @Test
    public void insertPerson(){
        sqlSession = MybatisUtil.getSqlSession();
        int id = 10000;
        String userName = "test";
        int age = 18;
        String mobilePhone = "18000000000";
        Person person = new Person();
        person.setId(id);
        person.setAge(age);
        person.setUserName(userName);
        person.setMobilePhone(mobilePhone);
        try{
            sqlSession.insert("insertPerson",person);
            sqlSession.commit();
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            MybatisUtil.closeSession(sqlSession);
        }

    }

    @Test
    public void queryById(){
        sqlSession = MybatisUtil.getSqlSession();
        int id = 1;
        try{
            Person person = sqlSession.selectOne("queryById",id);

            sqlSession.commit();
            System.out.println(person.getUserName());
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            MybatisUtil.closeSession(sqlSession);
        }

    }
}

最后测试，成功插入到数据库中