第三章.搭建MyBatis工程环境

1.数据库的准备：

数据库：

create DATABASE mybatis；

数据表：

CREATE TABLE `user` (
`id` int(10) NOT NULL AUTO_INCREMENT,
`username` varchar(120) DEFAULT NULL,
`password` varchar(50) DEFAULT NULL,
`gender` varchar(10) DEFAULT NULL,
`birthday` date DEFAULT NULL,
PRIMARY KEY (`id`)
)

INSERT into user(id,username,password,gender,birthday)
VALUES
(1,'程花花','','男','1998-12-23'),
(2,'李四','','男',，'1997-03-07'),
(3,'丽丽','','女','1996-01-05'),
(4,'花花','','女','1998-10-24');

到此数据库的准备工作已经完成，接下来是搭建工程环境。

 2.搭建工程环境（MyEclipse）：

在MyEclipse开发工具中创建新的一个web工程，命名为MyBatisFirstDemo

创建工程

工程目录：

在lib文件夹下面，添加我们所需要的jar包：

选中右键Build Path ->Add to Build Path

所有的jar包已打包上传：

链接：https://pan.baidu.com/s/1HSxt2WX03Mq4h9eYwPkpHg
提取码：1w2h

其他工程目录的详解：

log4j.properties

#Global logging configuration
# 在开发环境下日志级别要设成
log4j.rootLogger = DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern =%5p [%t] - %m%n

SqlMapConfig.xml（全局配置文件）

<?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>
     <settings>
         <setting name="logImpl" value="LOG4J"/>
     </settings>
     <environments default="development">
         <environment id="development">

             <transactionManager type="JDBC" />
             <!-- 数据连接池 -->
             <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                 <property name="url" value="jdbc:mysql://localhost:3306/mybatis_test?characterEnciding=utf-8"/>
                 <property name="username" value="root"/>
                 <property name="password" value="1234"/>
             </dataSource>
         </environment>

     </environments>

     <!-- 配置UserMapper.xml的映射地址 -->
     <mappers>
         <mapper resource="sqlmap/UserMapper.xml"/>
     </mappers>
 </configuration>

DataConnection .java

public class DataConnection {

    //MyBatis配置文件
    private String resource = "SqlMapConfig.xml";
    private SqlSessionFactory sqlSessionFactory;
    private SqlSession sqlSession;

    public SqlSession getSqlSession() throws IOException{
        InputStream inputStream = Resources.getResourceAsStream(resource);
        //创建会话工厂
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        sqlSession = sqlSessionFactory.openSession();
        return sqlSession;
    }
}

User.java
构造器（两个），setter&getter方法

public class User implements Serializable{

    private int id;
    private String username;
    private String password;
    private String gender;
    private Date birthday;
...
}

UserMapper.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">

<mapper namespace="test">
    <!-- id查询 -->
    <select id="findUserByid" parameterType="int" resultType="cn.com.mybatis.po.User" >
        select * from user where id=#{id}
    </select>

    <!-- 模糊查询 -->
    <select id="findUserByUsername" parameterType="java.lang.String" resultType="cn.com.mybatis.po.User">
        select * from user where username like '%${value}%'
    </select>

    <!-- 添加数据 -->
    <insert id="insertUser">
        insert into user(username,password,gender,birthday)
        value(#{username},#{password},#{gender},#{birthday})
    </insert>

    <!-- drop -->
    <delete id="deleteUser" parameterType="java.lang.Integer">
        delete from user where id=#{id}
    </delete>

    <!-- update -->
    <update id="update" parameterType="cn.com.mybatis.po.User">
        update user set username=#{username} where id=#{id}
    </update>
</mapper>

MyBatisTest.java

public class MyBatisTest {
        public DataConnection dataConn = new DataConnection();
    　　//根据id进行查询
        @Test
        public void TestSelect() throws IOException{
        SqlSession sqlSession = dataConn.getSqlSession();
        User user = sqlSession.selectOne("test.findUserByid",);
        System.out.println("username:" + user.getUsername());
        System.out.println("password:" + user.getPassword());
        System.out.println("gender:" + user.getGender());

        System.out.println("birthday:" + user.getBirthday());
        sqlSession.close();
    }

        //模糊查询
        @Test
        public void TestFuzzySearch() throws IOException{
            SqlSession sqlSession = dataConn.getSqlSession();
            List<User> userList = sqlSession.selectList("test.findUserByUsername","花");
            for (int i = ; i < userList.size(); i++) {
                User user  = userList.get(i);
                System.out.println("name:" + user.getUsername());
                System.out.println("password:" + user.getPassword());
                System.out.println("gender:" + user.getGender());
                System.out.println("birthday:" + user.getBirthday());
            }

            sqlSession.close();
        }

        //insert
        @Test
        public void TestInsert() throws IOException, ParseException{
            SqlSession sqlSessions = dataConn.getSqlSession();
            User user = new User();
            user.setUsername("嘉佳");
            user.setPassword("");
            user.setGender("女");

            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
            user.setBirthday(sdf.parse("1992-03-15")); 

            sqlSessions.insert("test.insertUser",user);
            sqlSessions.commit();
            sqlSessions.close();
        }

　　　　　//delete

　　　　　　@Test
　　　　　　public void TestDrop() throws IOException{
　　　　　　　　SqlSession sqlSession = dataConn.getSqlSession();
　　　　　　　　sqlSession.delete("test.deleteUser",6);
　　　　　　　　sqlSession.commit();
　　　　　　　　sqlSession.close();
　　　　　　}

//update 

　　　　　　@Test
　　　　　　public void Testupdate() throws IOException{
　　　　　　　　SqlSession sqlSession = dataConn.getSqlSession();
　　　　　　　　User user = new User();
　　　　　　　　user.setId(1);
　　　　　　　　user.setUsername("张花花");
　　　　　　　　sqlSession.update("test.update", user);
　　　　　　　　sqlSession.commit();
　　　　　　　　sqlSession.close();
　　　　　　}

}

注意：

测试类的创建：是下图的JUnit，在测试的时候，每个测试类上面都需要写@Test，需要调用的方法不需要加@Test

方便开发中的测试，可以不写main方法

对每个方法进行测试时可以进行单个测试，否则可能所有的测试都执行。

首先双击选中测试的类，右击选择Run As 可以看到一个Junit Test点击即可进行测试

1.根据id进行查询，此时查询到的单个记录

控制台代码（部分）

DEBUG [main] - Opening JDBC Connection
DEBUG [main] - Created connection .
DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@480bdb19]
DEBUG [main] - ==>  Preparing: select * from user where id=?
DEBUG [main] - ==> Parameters: (Integer)
DEBUG [main] - <==      Total:
username:花花
password:128722
gender:女
birthday:Sat Oct 24 00:00:00 CST 1998
DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@480bdb19]
DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@480bdb19]
DEBUG [main] - Returned connection  to pool.

2.模糊查询，此时查询道德可能是多个记录

控制台代码（部分）

DEBUG [main] - Opening JDBC Connection
DEBUG [main] - Created connection .
DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@13c27452]
DEBUG [main] - ==>  Preparing: select * from user where username like '%花%'
DEBUG [main] - ==> Parameters:
DEBUG [main] - <==      Total:
name:程花花
password:12345
gender:男
birthday:Wed Dec 23 00:00:00 CST 1998
name:花花
password:128722
gender:女
birthday:Sat Oct 24 00:00:00 CST 1998
DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@13c27452]
DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@13c27452]

3.insert 插入数据

控制台代码（部分）

DEBUG [main] - Opening JDBC Connection
DEBUG [main] - Created connection .
DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@]
DEBUG [main] - ==>  Preparing: insert into user(username,password,gender,birthday) value(?,?,?,?)
DEBUG [main] - ==> Parameters: 嘉佳(String), 55555(String), 女(String), 1992-03-15 00:00:00.0(Timestamp)
DEBUG [main] - <==    Updates:
DEBUG [main] - Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@]
DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@]
DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@]

数据库中：

4.delete可见在3操作中成功添加数据id=6的嘉佳

此时来测试删除该记录

控制台代码（部分）

DEBUG [main] - Created connection .
DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@bd8db5a]
DEBUG [main] - ==>  Preparing: delete from user where id=?
DEBUG [main] - ==> Parameters: 6(Integer)
DEBUG [main] - <==    Updates:
DEBUG [main] - Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@bd8db5a]
DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@bd8db5a]
DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@bd8db5a]

刷新数据库：

此时在3操作添加的记录成功删除！

5.update更新操作

id为的username为程花花貌似很难听

修改一下为张花花

控制台代码（部分）

DEBUG [main] - Opening JDBC Connection
DEBUG [main] - Created connection .
DEBUG [main] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@bd8db5a]
DEBUG [main] - ==>  Preparing: update user set username=? where id=?
DEBUG [main] - ==> Parameters: 张花花(String), 1(Integer)
DEBUG [main] - <==    Updates:
DEBUG [main] - Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@bd8db5a]
DEBUG [main] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@bd8db5a]
DEBUG [main] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@bd8db5a]

刷新数据库：

 

至此，当您看到这里，并且会单独操作，作为初学者，您已经成功入门了！