MyBatis 整合 Druid

pom.xml 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</groupId>
    <artifactId>test</artifactId>
    <version>1.0-SNAPSHOT</version>

    <dependencies>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.19</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.17</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

新建配置类，实现 mybatis 的 DataSourceFactory 接口

Druid 中也有一个叫 DruidDataSourceFactory 的类，怕混淆就取其它名字。

package com.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.apache.ibatis.datasource.DataSourceFactory;

import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.Properties;

public class DruidDataSourceFactory implements DataSourceFactory {

    private Properties properties;

    @Override
    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    @Override
    public DataSource getDataSource() {
        DruidDataSource dds = new DruidDataSource();
        dds.setUrl(this.properties.getProperty("url"));
        dds.setUsername(this.properties.getProperty("username"));
        dds.setPassword(this.properties.getProperty("password"));
        try {
            dds.init();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return dds;
    }
}

配置文件 mybatis-config.xml，数据源类型为配置类全类名

<?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>

    <!-- 外部 properties 配置文件  -->
    <properties resource="db.properties"/>

    <!--配置数据源-->
    <environments default="development-mysql">
        <environment id="development-mysql">
            <transactionManager type="JDBC"/>
            <dataSource type="com.config.DruidDataSourceFactory">
                <property name="url" value="${jdbc.jdbcUrl}"/>
                <property name="username" value="${jdbc.user}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <!-- mappers：将 SQL 映射文件注册到全局配置中 -->
    <mappers>
        <!-- 引用类路径下的 SQL 映射文件 -->
        <mapper resource="mapper/XXXMapper.xml"/>
    </mappers>
</configuration>

数据库连接信息 db.properties

jdbc.driverClass=com.mysql.cj.jdbc.Driver
jdbc.jdbcUrl=jdbc:mysql://127.0.0.1:3306/test?useSSL=false&useUnicode=true&characterEncoding=UTF8&serverTimezone=GMT
jdbc.user=root
jdbc.password=root

测试

public static void main(String[] args) {
    SqlSession session = null;
    SqlSession batchSession = null;
    try {
        String resource = "mybatis-config.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        session = sqlSessionFactory.openSession();
        batchSession = sqlSessionFactory.openSession(ExecutorType.BATCH);

        // 不用接口的方式
        // User user = session.selectOne("com.dao.UserMapper.selectUser",1);

        session.commit();
        batchSession.commit();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        if (session != null) {
            session.close();
        }
        if (batchSession != null) {
            batchSession.close();
        }
    }
}

---

https://yeyouluo.github.io/2017/10/16/shi-yong-mybatis-ji-cheng-a-li-ba-ba-druid-lian-jie-chi-bu-shi-yong-spring/

https://github.com/alibaba/druid/wiki/DruidDataSource%E9%85%8D%E7%BD%AE