1.在pom.xml中添加C3P0依赖

 <dependency><groupId>com.mchange</groupId><artifactId>c3p0</artifactId><version>0.9.5.4</version></dependency>

2.创建工厂类

/*** C3P0与MyBatis兼容使用的数据源工厂类*/
public class C3P0DataSourceFactory extends UnpooledDataSourceFactory {public C3P0DataSourceFactory(){this.dataSource=new ComboPooledDataSource();}
}

3.在mybatis-config.xml中配置数据源

			dataSource type="datasource.C3P0DataSourceFactory"><property name="driverClass" value="com.mysql.cj.jdbc.Driver"/><property name="jdbcUrl" value="jdbc:mysql://localhost:3306/babytun?useUnicode=true&amp;characterEncoding=UTF-8"/><property name="user" value="root"/><property name="password" value="root"/><property name="initialPoolSize" value="5"/><property name="maxPoolSize" value="20"/><property name="minPoolSize" value="5"/><!--...--></dataSource>