Mybatis 各个文件的配置
2023-03-15 22:06:33 时间
1.mybatis-config.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核心配置文件-->
<configuration>
<!--导入外部资源路径 -->
<properties resource="db.properties"/>
<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 resource="databases/AdministratorMapper.xml" />
<mapper resource="databases/CarMessagesMapper.xml" />
<mapper resource="databases/InOutMapper.xml" />
<mapper resource="databases/ParkMessagesMapper.xml" />
</mappers>
</configuration>]
2.pom.xml
<?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>org.example</groupId>
<artifactId>MybatisStudy</artifactId>
<packaging>pom</packaging>
<version>1.0-SNAPSHOT</version>
<modules>
<module>mybatis01</module>
</modules>
<dependencies>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!--mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<!--junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
</dependencies>
</project>
3.MybatisUtils
package mybatis.utils;
import java.io.IOException;
import java.io.InputStream;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
/**
* description: <br>
* date: 2021/4/26 20:59 <br>
* author: ztz <br>
* version: 1.0 <br>
*/
public class MybatisUtils {<!-- -->
private static SqlSessionFactory sqlSessionFactory;
static {<!-- -->
//使用mybatis第一步,获取sqlSessionFactory对象
String resources = "mybatis-config.xml";
try {<!-- -->
InputStream inputStream = Resources.getResourceAsStream(resources);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {<!-- -->
e.printStackTrace();
}
}
//既然有了sqlSessionFactory,顾名思义,我们就可以从中获取SqlSession的实例
//SqlSession 完全包含了面向数据库执行sql的所有方法
public static SqlSession getSqlSession(){<!-- -->
return sqlSessionFactory.openSession();
}
}
4.db.properties
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatisuseSSL=true&useUnicode=true&characterEncoding=UTF-8
// 你的用户名
username=root
// 你的密码
password=123456
5.UserMapper.xml(Mapper例子)
<?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="com.tansty.dao.UserMapper">
<select id="getUserList" resultType="com.tansty.pojo.User">
select * from mybatis.user
</select>
<select id="getUserList2" resultType="com.tansty.pojo.User" >
select * from mybatis.user where user like #{value}
</select>
<insert id="insertUser" parameterType="com.tansty.pojo.User" >
insert into mybatis.user(id,user,pwd) values(#{id},#{user},#{pwd})
</insert>
<insert id="insertUser2" parameterType="map" >
insert into mybatis.user(id,user,pwd) values(#{id},#{userName},#{password})
</insert>
<delete id="deleteUser" parameterType="int" >
delete from mybatis.user where id=#{id}
</delete>
<update id="updateUser" parameterType="com.tansty.pojo.User">
update mybatis.user set user = #{user},pwd=#{pwd} where id=#{id} ;
</update>
</mapper>
6.资源导出问题解决
<build>
<resources>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
</resource>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
</resource>
</resources>
</build>
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