Notes on Mybatis(IDEA版)
1. 建立maven工程
1.1 File–>New–>Project–>Maven
1.2 自定义GroupId和ArtifactId,如下图所示:(然后点击Next)
1.3 自定义Project_name和Project_location,如下图所示: (然后点击Finish)
1.4 完成创建工作
2. 开始配置工作
2.1 完成第一步,右下角会出现一个提示框,如下图所示:
(选择Enable Auto-Import)
2.2 在pom.xml文件中,version结束标签之后,project结束标签之前,添加以下内容:
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
</dependency>
</dependencies>
2.3 进入编写JavaBean和Interface阶段
2.3.1 选中src/main/java,鼠标右击,新建一个包,名为(例如:com.Taking.domain),再创建一个User类
package com.Taking.domain;
import java.util.Date;
public class User {
private int id;
private String name;
private String gender;
private Date birthday;
private String address;
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 getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
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 +
", name='" + name + '\'' +
", gender='" + gender + '\'' +
", birthday=" + birthday +
", address='" + address + '\'' +
'}';
}
}
2.3.2 选中src/main/java,鼠标右击,新建一个Package,名为(例如:com.Taking.dao),再创建一个UserDao接口
package com.Taking.dao;
import com.Taking.domain.User;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import java.util.List;
public interface UserDao {
//数据库基本的CRUD方法
@Insert("insert into user (name,sex,birthday,address) values (#{name},#{sex},#{birthday},#{address});")
void insertUser(User user);
@Delete("delete from user where id=#{id};")
void deleteUser(int id);
@Update("update user set name=#{name},sex=#{sex},birthday=#{birthday},address=#{address} where id=#{id};")
void updateUser(User user);
@Select("select * from user;")
List<User> selectUser();
}
2.4 添加Config.properties到src/main/resources,Config.properties中的内容如下:
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/数据库/表名
username=你自己设置的数据库登陆用户名
password=你自己设置的数据库登陆密码
2.5 选中src/main/resources,鼠标右击,新建一个File,名为(例如:SqlMapConfig.xml),并添加一下内容
<?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">
<!--mybatis的主配置文件-->
<configuration>
<properties resource="Config.properties"></properties>
<typeAliases>
<!--<typeAlias type="com.Taking.domain.User" alias="user"></typeAlias>-->
<package name="com.Taking.domain"></package>
</typeAliases>
<!--配置环境-->
<environments default="mysql">
<!--配置mysql的环境-->
<environment id="mysql">
<!--配置事务的类型-->
<transactionManager type="JDBC"></transactionManager>
<!--配置数据源(连接池)-->
<dataSource type="POOLED">
<!--配置连接数据库的4个基本信息-->
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<!--指定映射配置文件的位置,映射配置文件指的是每个dao独立的配置文件-->
<mappers>
<!--<mapper resource="com/Taking/dao/UserDao.xml"/>-->
<!--<mapper class="com.Taking.dao.UserDao"/>-->
<package name="com.Taking.dao"></package>
</mappers>
</configuration>
2.6 选中src/test/java,鼠标右击,新建测试类,名为(MybatisTest),内容如下
import com.Taking.dao.UserDao;
import com.Taking.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.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.List;
public class MybatisTest {
private InputStream is;
private SqlSessionFactoryBuilder builder;
private SqlSessionFactory factory;
private SqlSession sqlSession;
private UserDao userDao;
@Before
public void init() throws IOException {
is = Resources.getResourceAsStream("SqlMapConfig.xml");
builder = new SqlSessionFactoryBuilder();
factory = builder.build(is);
sqlSession = this.factory.openSession();
userDao = sqlSession.getMapper(UserDao.class);
}
@After
public void destroy() throws IOException {
sqlSession.commit();
sqlSession.close();
is.close();
}
@Test
public void testInsertUser(){
User user = new User();
user.setId(2319);
user.setName("黄月英");
user.setSex("女");
user.setBirthday(new Date());
user.setAddress("王者峡谷");
userDao.insertUser(user);
}
@Test
public void testDeleteUser(){
userDao.deleteUser(2318);
}
@Test
public void testUpdateUser(){
User user = new User();
user.setId(2318);
user.setName("刘备");
user.setSex("男");
user.setBirthday(new Date());
user.setAddress("王者峡谷");
userDao.updateUser(user);
}
@Test
public void testSelectUser(){
List<User> users = userDao.selectUser();
for (User user : users) {
System.out.println(user);
}
}
}
3. 运行结果
3.1 IDEA执行selectUser方法,得到的结果如下图:
3.2 SQLyog的数据截图:
4. 说明:
1. 本例中我使用的是注解方式,同时我删掉了很多注释,是因为个人觉得看起来简洁,代码量少
2. 如果不用注解,也是可以的,需要自己写接口映射的XML配置文件,同时在SqlMapConfig.xml中mappers标签体内的mapper标签中添加属性resource
3. 所用的数据纯自拟,(数据库日期最早是1601年1月1日)