整合Spring自帶連線池

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql:///spring4_day03"/>
    <property name="username" value="root"/>
    <property
 
 name="password" value="abc"/>
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource" />
</bean>

整合DBCP連線池

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property
 
 name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql:///spring4_day03"/>
    <property name="username" value="root"/>
    <property name="password" value="abc"/>
</bean>

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"
 
>
    <property name="dataSource" ref="dataSource" />
</bean>

整合C3P0連線池

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="com.mysql.jdbc.Driver"/>
    <property name="jdbcUrl" value="jdbc:mysql:///spring4_day03"/>
    <property name="username" value="root"/>
    <property name="password" value="abc"/>
</bean>

<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource" />
</bean>

配置屬性檔案

把屬性檔案提取出來有助於結構層次的清晰。需要修改值的時候，只需要維護屬性檔案就可以了。

#屬性檔案
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost/jdbc-study
jdbc.name=root
jdbc.password=root

<!-- 引入屬性檔案-->
<context:property-placeholder location="classpath:jdbc.properties"/>

<!-- 使用屬性檔案的值 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="${jdbc.driverClass}"/>
    <property name="jdbcUrl" value="${jdbc.url}"/>
    <property name="user" value="${jdbc.name}"/>
    <property name="password" value="${jdbc.password}"/>
</bean>

C3P0的測試

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;

public class Test {
    public static void main(String[] args) {

        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        JdbcTemplate jt = (JdbcTemplate) ac.getBean("jdbcTemplate");

        String sql = "insert into students(id, name, clazz) values(?, ?, ?)";
        jt.update(sql, "160341237", "詹金浩", "1234");
    }
}