MyBatis：基本配置和使用

添加依赖

<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.4.0</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.6</version>
</dependency>

定义jdbc配置文件：jdbc.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/excel
username=root
password=****

定义mybatis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>
    <properties resource="jdbc.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="com/xjb/mapper/Person.xml" />
    </mappers>
</configuration>

定义表的sqlmap文件：com/xjb/mapper/Person.xml

<?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="Person">
    <select id="getPerson" resultType="hashMap">
        select * from person where name like CONCAT('%', #{name}, '%')
    </select>
    <select id="countPerson" resultType="int">
        select count(0) from person
    </select>
</mapper>

java类中调用：

package com.xjb;

import java.io.IOException;
import java.io.InputStream;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
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.apache.log4j.Logger;

public class MainListener implements ServletContextListener {
    private static Logger logger = Logger.getLogger(MainListener.class);
    private static SqlSessionFactory sqlSessionFactory;
    
    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
    }

    @Override
    public void contextInitialized(ServletContextEvent arg0) {
        String resource = "SqlMapConfig.xml";
        InputStream inputStream = null;
        try {
            inputStream = Resources.getResourceAsStream(resource);
        } catch (IOException e) {
            e.printStackTrace();
        }
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        logger.info("sqlSessionFactory init done!");
        SqlSession sqlSession = MainListener.getSqlSessionFactory().openSession();
        List<Map<String, Object>> list = sqlSession.selectList("Person.getPerson", "张三");
        System.out.println(list);
    }

    public static SqlSessionFactory getSqlSessionFactory() {
        return sqlSessionFactory;
    }

}