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Mybatis一站式新手入门(IDEA)


#Mybatis官网入门地址:https://mybatis.org/mybatis-3/zh/getting-started.html

Mybatis一站式新手入门(IDEA)_mybatis

Mybatis一站式新手入门(IDEA)_java_02

#创建空项目,创建Maven模块

Mybatis一站式新手入门(IDEA)_sql_03

Mybatis一站式新手入门(IDEA)_xml_04

#配置pom.xml
<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">
<parent>
<artifactId>mybatisDemo</artifactId>
<groupId>org.example</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>

<artifactId>test</artifactId>
<packaging>jar</packaging>

<name>test</name>
<url>http://maven.apache.org</url>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>

<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- mybatis 依赖 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.1</version>
</dependency>
<!--mysql依赖-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.9</version>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<!--所在的目录-->
<directory>src/main/java</directory>
<includes>
<!--包括目录下的.properties .xml文件都会扫描到-->
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>

</project>

Mybatis一站式新手入门(IDEA)_intellij-idea_05

#创建resources文件夹

Mybatis一站式新手入门(IDEA)_mybatis_06

#创建一个User类(根据数据库表)
public class User {
private int p_id;
private String p_name;
private String address;
private String birth;
private String gender;

get+set方法(自行脑补--)
}

Mybatis一站式新手入门(IDEA)_java_07

#创建User接口

Mybatis一站式新手入门(IDEA)_intellij-idea_08

#创建sql映射文件UserDao.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!--约束文件 mybatis-3-mapper.dtd约束文件的名称,扩展名btd(用来限制和检测当前文件中出现的标签,属性必须符合mybatis的要求)-->
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"https://mybatis.org/dtd/mybatis-3-mapper.dtd">

<!--namespace名称空间,唯一,可自定义,要求使用dao接口的全限定名称-->
<!--mapper是当前文件的根标签 dao的全限定名称 resultType返回结果类型 id唯一标识-->
<mapper namespace="org.example.dao.UserDao">

<select id="selectUsers" resultType="org.example.domain.User">
SELECT * FROM TEST1;
</select>
<!--
<update id=""></update>
<insert id=""></insert>
-->
</mapper>

<!--sql映射文件:写sql语句的 ,mybatis会执行这些sql-->

Mybatis一站式新手入门(IDEA)_java_09

Mybatis一站式新手入门(IDEA)_mybatis_10

#尝试编译

Mybatis一站式新手入门(IDEA)_sql_11

#创建mybatis主配置文件mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- default必须和environment值一样-->
<environments default="myuser">
<!--environment可以有多个 但id唯一-->
<environment id="myuser">
<!--transactionManager,mybatis的事务类型 commit rollback-->
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://IP:3306/mysql?"/>
<property name="username" value="root"/>
<property name="password" value="password"/>
</dataSource>
</environment>

</environments>
<!-- mapper sql映射文件的位置 target/classes类路径-->
<mappers>
<mapper resource="org/example/dao/UserDao.xml"/>
</mappers>
</configuration>
<!--mybatis主配置文件:主要定义了数据库的配置信息,sql映射文件的位置-->

Mybatis一站式新手入门(IDEA)_mybatis_12

 

#创建一个测试类
public class Sqltest {
public static void main(String[] args) throws IOException {
//mybatis读取User数据
//1.定义mybatis主配置文件名称,从类路径开始(target/clasess)
String resource = "mybatis-config.xml";
//读取mybatis-config.xml文件
InputStream inputStream = Resources.getResourceAsStream(resource);
//创建SqlSessionFactory对象
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
//(关键)获取sqlSessionFactory对象,从SqlSessionFactory中获取sqlSession
SqlSession sqlSession =sqlSessionFactory.openSession();
//(关键)指定要执行的sql语句的标识。(sql映射文件的namesapce+id标识)
String Sqlmapper ="org.example.dao.UserDao.selectUsers";
//执行sql语句
List<User> userList = sqlSession.selectList(Sqlmapper);
//输出结果
//userList.forEach(users -> System.out.println(users));
for (User u:userList) {System.out.println(u);}
//释放资源
sqlSession.close();
}
}

Mybatis一站式新手入门(IDEA)_xml_13

#重新编译一遍,执行

Mybatis一站式新手入门(IDEA)_mybatis_14

 

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