001.Mybatis整合Druid连接池

1.在pom.xml中添加依赖

<!--Druid数据库连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.14</version>
        </dependency>

2.扩展一个数据源工厂（com.imooc.oa.datasource）

package com.imooc.oa.datasource;

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

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

public class DruidDataSourceFactory extends UnpooledDataSourceFactory {
    @Override
    public DataSource getDataSource() {
        try {
            ((DruidDataSource)this.dataSource).init();
        } catch (SQLException throwables) {
            throw new RuntimeException(throwables);
        }
        return this.dataSource;
    }

    public DruidDataSourceFactory(){
        this.dataSource = new DruidDataSource();
    }

}

3.修改mybatis-config.xml中dataSource

<?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>

    <settings>
        <!--开启驼峰命名转换 form_id -> formId-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>

    <environments default="dev">
        <environment id="dev">
            <transactionManager type="JDBC"/>
            <!--<dataSource type="POOLED">-->
            <dataSource type="com.imooc.oa.datasource.DruidDataSourceFactory">
                <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url"
                          value="jdbc:mysql://localhost:3306/imooc_oa?useSSL=false&useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true"/>
                <property name="username" value="root"/>
                <property name="password" value="197366"/>
                <property name="initialSize" value="10"/>
                <property name="maxActive" value="20"/>
            </dataSource>
        </environment>
    </environments>


    <mappers>
        <mapper resource="mappers/test.xml"/>
        <mapper resource="mappers/user.xml"/>
    </mappers>

</configuration>