SSM学习

ssm

Spring ：业务层框架

SpringMVC ：开发web应用的模块 model+view+controller

Mybatis ：持久化 jdbcmysql

Mybatis

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1、创建项目及模块

2、添加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>com.ly.mybatis</groupId>
    <artifactId>mybatisdemo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.2.1</version>
    </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.17</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
        </dependency>
    </dependencies>
</project>

3、添加配置 [resources/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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/mybatis"/>
                <property name="username" value="root"/>
                <property name="password" value="root"/>
            </dataSource>
        </environment>
    </environments>
</configuration>

4、创建数据库和表
5、测试连接

public static void main(String[] args) {
        try{
            //配置文件路径(类路径)
            String resource = "mybatis-config.xml";
            //加载文件
            InputStream inputStream = Resources.getResourceAsStream(resource);
            //创建会话工厂Builder，相当于连接池。
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
            //通过sqlSessionFactory开启会话，相当于打开连接。
            SqlSession sqlSession = sqlSessionFactory.openSession();
            System.out.println(sqlSession);
        }catch(IOException e){
            e.printStackTrace();
        }
    }

6、编写Mapper文件。
a)创建user类，和user表对应。
b）创建userMapper.xml文件，
[domain/UserMapper]

<?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="tUser">
    <insert id = "insert" >
        INSERT into tUser(name,age) values(#{name},#{age});
    </insert>
</mapper>