hikariConfig   설정

	<bean id="hikariConfig" class="com.zaxxer.hikari.HikariConfig">
		<property name="poolName" value="mercatus_connection_pool" />		 
		<property name="maximumPoolSize" value="50" />
		<property name="maxLifetime" value="60000" />
		<property name="idleTimeout" value="30000" />
		
		<property name="driverClassName" value="${jdbc.driverClassName}"></property>
		<property name="jdbcUrl" value="${jdbc.url}"></property> 	
		<property name="username" value="${jdbc.username}"></property>
		<property name="password" value="${jdbc.password}"></property>
	</bean>
	
		
	<!-- 2. HikariCP 를 통해 커넥션을 관리하는 DataSource 객체(HikariDataSource) 설정 -->
	<!-- 생성자 파라미터로 1번에서 생성한 HikariConfig 객체 전달 -->
	<bean id="dataSource" class="com.zaxxer.hikari.HikariDataSource">
		<constructor-arg ref="hikariConfig"></constructor-arg>
	</bean>