一、环境搭建
1、创建数据库表
使用mybatis入门中的数据：https://blog.csdn.net/yu1755128147/article/details/103358209
2、创建maven工程并导入坐标
3、创建实体类、持久层dao接口
实体类
package com.wedu.mybatis14.domain;
import java.io.Serializable;
import java.util.Date;
/**
* 用户实体
*/
public class User implements Serializable {
private Integer id;
private String username;
private Date birthday;
private String sex;
private String address;
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 Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", birthday=" + birthday +
", sex='" + sex + '\'' +
", address='" + address + '\'' +
'}';
}
}持久层接口
package com.wedu.mybatis14.dao;
import java.util.List;
/**
* 用户持久层接口
*/
public interface IUserDao {
}4、创建数据库配置文件：jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=1234565、创建日志文件：log4j.properties
# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE debug info warn error fatal
log4j.rootCategory=debug, CONSOLE, LOGFILE
# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE
# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n
# LOGFILE is set to be a File appender using a PatternLayout.
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=E:\\project\\axis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n6、创建配置文件：SqlMapConfig.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>
<!--引用外部的配置文件信息-->
<properties resource="jdbc.properties"/>
<!--配置别名-->
<typeAliases>
<package name="com.wedu.mybatis14.domain"/>
</typeAliases>
<!--配置环境-->
<environments default="mysql">
<environment id="mysql">
<!--配置事务的类型-->
<transactionManager type="JDBC"></transactionManager>
<!--配置数据源-->
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>
<!--配置映射文件的位置-->
<mappers>
<package name="com.wedu.mybatis14.dao" />
</mappers>
</configuration>7、创建测试类
package com.wedu.mybatis14.dao;
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 java.io.IOException;
/**
* mybatis的注解开发CRUD
*/
public class UserDaoTest {
private SqlSession session;
private IUserDao userDao;
@Before
public void init() throws IOException {
//1、加载配置文件并创建SqlSessionFactory工厂
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsStream("SqlMapConfig.xml"));
//2、使用工厂创建SqlSession对象
session = factory.openSession();
//3、使用SqlSession创建Dao接口的代理对象
userDao = session.getMapper(IUserDao.class);
}
@After
public void destroy(){
//释放资源
session.close();
}
}二、mybatis注解开发CRUD
1、添加操作
1.1、在IUserDao中添加insert方法和sql语句注解
/**
* 添加用户
* @param user
*/
@Insert("insert into user (username,birthday,sex,address) values (#{username},#{birthday},#{sex},#{address})")
void save(User user);1.2、在UserDaoTest中测试添加功能
/**
* 添加用户
*/
@Test
public void testSave() {
User user = new User();
user.setUsername("wangwu");
user.setBirthday(new Date());
user.setSex("男");
user.setAddress("上海");
userDao.save(user);
session.commit();
}2、更新操作
1.1、在IUserDao中添加update方法和sql语句注解
/**
* 更新用户
* @param user
*/
@Update("update user set username=#{username},birthday=#{birthday},sex=#{sex},address=#{address} where id=#{id}")
void update(User user);1.2、在UserDaoTest中测试更新功能
/**
* 更新用户
*/
@Test
public void testUpdate() {
User user = new User();
user.setId(49);
user.setUsername("zhaoliu");
user.setBirthday(new Date());
user.setSex("女");
user.setAddress("北京");
userDao.update(user);
session.commit();
}3、查询操作
1.1、在IUserDao中添加查询方法和sql语句注解
/**
* 根据id查询用户
* @param id
* @return
*/
@Select("select * from user where id=#{id}")
User findById(Integer id);1.2、在UserDaoTest中测试查询功能
/**
* 根据id查询用户
*/
@Test
public void testfindById() {
User user = userDao.findById(48);
System.out.println(user);
}4、 删除操作
1.1、在IUserDao中添加删除方法和sql语句注解
/**
* 删除用户
* @param id
*/
@Delete("delete from user where id=#{id}")
void delete(Integer id);1.2、在UserDaoTest中测试删除功能
/**
* 删除用户
*/
@Test
public void testDelete() {
userDao.delete(49);
session.commit();
}