day39-Spring 15-Spring的JDBC模板：C3P0连接池配置

    <!-- 配置C3P0连接池 -->
    <bean id="dataSource2" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql:///spring3_day02"></property>
        <property name="user" value="root"></property>
        <property name="password" value=""></property>

    </bean>

配置好连接池之后把它注入到JDBC模板.

21:55:24,695  INFO XmlBeanDefinitionReader:315 - Loading XML bean definitions from class path resource [applicationContext.xml]
21:55:24,969  INFO GenericApplicationContext:510 - Refreshing org.springframework.context.support.GenericApplicationContext@43401ab6: startup date [Fri May 05 21:55:24 CST 2017]; root of context hierarchy
21:55:25,127  INFO DefaultListableBeanFactory:577 - Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@cf7e5b2: defining beans [dataSource,dataSource1,dataSource2,jdbcTemplate,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy
21:55:25,170  INFO DriverManagerDataSource:153 - Loaded JDBC driver: com.mysql.jdbc.Driver
21:55:25,209  INFO MLog:80 - MLog clients using log4j logging.
21:55:25,394  INFO C3P0Registry:204 - Initializing c3p0-0.9.1.2 [built 21-May-2007 15:04:56; debug? true; trace: 10]
21:55:25,564  INFO AbstractPoolBackedDataSource:462 - Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> 3, acquireRetryAttempts -> 30, acquireRetryDelay -> 1000, autoCommitOnClose -> false, automaticTestTable -> null, breakAfterAcquireFailure -> false, checkoutTimeout -> 0, connectionCustomizerClassName -> null, connectionTesterClassName -> com.mchange.v2.c3p0.impl.DefaultConnectionTester, dataSourceName -> 2ygg1c9n1o6hot718sug49|4706c7b2, debugUnreturnedConnectionStackTraces -> false, description -> null, driverClass -> com.mysql.jdbc.Driver, factoryClassLocation -> null, forceIgnoreUnresolvedTransactions -> false, identityToken -> 2ygg1c9n1o6hot718sug49|4706c7b2, idleConnectionTestPeriod -> 0, initialPoolSize -> 3, jdbcUrl -> jdbc:mysql:///spring3_day02, maxAdministrativeTaskTime -> 0, maxConnectionAge -> 0, maxIdleTime -> 0, maxIdleTimeExcessConnections -> 0, maxPoolSize -> 15, maxStatements -> 0, maxStatementsPerConnection -> 0, minPoolSize -> 3, numHelperThreads -> 3, numThreadsAwaitingCheckoutDefaultUser -> 0, preferredTestQuery -> null, properties -> {user=******, password=******}, propertyCycle -> 0, testConnectionOnCheckin -> false, testConnectionOnCheckout -> false, unreturnedConnectionTimeout -> 0, usesTraditionalReflectiveProxies -> false ]
21:55:25,975  INFO GenericApplicationContext:1042 - Closing org.springframework.context.support.GenericApplicationContext@43401ab6: startup date [Fri May 05 21:55:24 CST 2017]; root of context hierarchy
21:55:25,975  INFO DefaultListableBeanFactory:444 - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@cf7e5b2: defining beans [dataSource,dataSource1,dataSource2,jdbcTemplate,org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor]; root of factory hierarchy

初始化C3P0的连接池等等的一些信息.

---

<?xml version="1.0" encoding="UTF-8"?>
<!-- 引入beans的头 -->
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!-- 配置Spring默认的连接池 -->
    <!-- 这个类由Spring来帮我们创建,它默认情况下只创建一次,因为是单例的. -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">

        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql:///spring3_day02"></property>
        <property name="username" value="root"></property>
        <property name="password" value=""></property>

    </bean>
    <!-- 配置DBCP连接池 -->
    <bean id="dataSource1" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql:///spring3_day02"></property>
        <property name="username" value="root"></property>
        <property name="password" value=""></property>

    </bean>

    <!-- 配置C3P0连接池 -->
    <bean id="dataSource2" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql:///spring3_day02"></property>
        <property name="user" value="root"></property>
        <property name="password" value=""></property>

    </bean>
    <!-- 定义jdbctemplate -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
          <property name="dataSource" ref="dataSource2"></property><!-- 把上面定义好的连接池注入进来了 -->
    </bean>
</beans>

package cn.itcast.spring3.demo1;

import java.sql.DriverManager;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.transaction.jta.SpringJtaSynchronizationAdapter;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class SpringTest1 {

    @Autowired
    @Qualifier("jdbcTemplate")
    private JdbcTemplate jdbcTemplate;//注入Jdbc模板
    @Test
    public void demo2(){
        jdbcTemplate.execute("create table user (id int primary key auto_increment,name varchar(20))");
    }

    @Test
    public void demo1(){
        // 创建连接池:
        DriverManagerDataSource dataSource = new DriverManagerDataSource();//Spring自带的连接池
        // 设置参数:
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql:///spring3_day02");
        dataSource.setUsername("root");
        dataSource.setPassword("");

        //使用JDBC的模板:
        //JdbcTemplate jdbcTemplate = new JdbcTemplate();
        //jdbcTemplate.setDataSource(dataSource);
        JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
        jdbcTemplate.execute("create table user (id int primary key auto_increment,name varchar(20))");
    }
}