Mybaits的简易版创建(依据原文档创建)
Mybaits的简易版创建
步骤一:创建空的maven环境,next然后写入对应名称,再补全项目名称,最后finfish即可
步骤二:引入有关的mybatis环境,在pom.xml中加入有关依赖
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.xv</groupId>
<artifactId>mybatis-model</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>MysqL</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.42</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.16</version>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
</build>
</project>
步骤三:在resources文件夹下创建mybatis-config.xml、db.properties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>
<!--引入外部配置文件-->
<properties resource="db.properties">
</properties>
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
<!--开启全局缓存-->
<setting name="cacheEnabled" value="true"/>
</settings>
<!--给实体类起别名-->
<typeAliases>
<!--第一种利用类对应-->
<!--<typeAlias type="com.xv.pojo.User" alias="User" ></typeAlias>-->
<!--第二种利用包对应-->
<package name="com.xv.pojo"></package>
</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 class="com.xv.dao.UserMapper"/>
</mappers>
</configuration>
db.properties代码如下,按照自己的数据库进行相应修改:
driver=com.MysqL.jdbc.Driver
url=jdbc:MysqL://localhost:3306/mybatis?useSSL=true&userUnicode=true&characterEncoding=utf-8
username=root
password=root
步骤四:创建mybatisutils工具类方便sql操作
MybatisUtils:
package com.xv.utils;
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 java.io.IOException;
import java.io.InputStream;
public class MybatisUtils {
private static sqlSessionFactory sqlSessionFactory;
static {
try {
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsstream(resource);
sqlSessionFactory = new sqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printstacktrace();
}
}
public static sqlSession getsqlSession(){
return sqlSessionFactory.openSession();
}
}
步骤五:创建pojo和dao
步骤六:测试
- 创建mybatis数据库
- 创建User表
/*
Navicat MysqL Data Transfer
Source Server : erp
Source Server Version : 50626
Source Host : localhost:3306
Source Database : mybatis
Target Server Type : MysqL
Target Server Version : 50626
File Encoding : 65001
Date: 2020-11-29 16:02:20
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(20) NOT NULL,
`name` varchar(30) DEFAULT NULL,
`pwd` varchar(30) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'update', '1121885408');
INSERT INTO `user` VALUES ('2', 'xcg1', '1234567');
INSERT INTO `user` VALUES ('3', 'xcg2', '12345678');
INSERT INTO `user` VALUES ('4', '小尴尬', '2333');
INSERT INTO `user` VALUES ('5', 'map', 'wannengmap');
INSERT INTO `user` VALUES ('9', 'Hello', '123123');
INSERT INTO `user` VALUES ('10', 'Hello', '123123');
- User实体在pojo中(这里偷懒用了lombok)
代码:
package com.xv.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.io.Serializable;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User implements Serializable {
private int id;
private String name;
private String pwd;
}
- dao写入UserMappe和UserMapper.xml
UserMapper:
package com.xv.dao;
import com.xv.pojo.User;
import org.apache.ibatis.annotations.Param;
import java.util.List;
public interface UserMapper {
public User getUserById(@Param("id") int id);
public List<User> getUser();
}
UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.xv.dao.UserMapper">
<cache/>
<select id="getUserById" resultType="com.xv.pojo.User">
select * from user where id = #{id}
</select>
<select id="getUser" resultType="User">
select * from user;
</select>
</mapper>
- 在测试区写入测试利用(junit测试)
代码:
在这里插入代码片package com.xv.dao;
import com.xv.pojo.User;
import com.xv.utils.MybatisUtils;
import org.apache.ibatis.session.sqlSession;
import org.junit.Test;
import java.util.List;
public class TestUserMapper {
@Test
public void testGetUserById(){
sqlSession sqlSession = MybatisUtils.getsqlSession();
sqlSession sqlSession2 = MybatisUtils.getsqlSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
User userById = mapper.getUserById(1);
System.out.println(userById);
sqlSession.close();
UserMapper mapper2 = sqlSession2.getMapper(UserMapper.class);
List<User> userById2 = mapper2.getUser();
for (User user : userById2) {
System.out.println(user);
}
sqlSession2.close();
}
}
心得:推荐仔细查看官方源文档,对代码提升有很大帮助!!!视频极力推荐狂神mybatis。。。。有好的资源或者有不足的地方还请各方神仙们指正。。
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。