Spring配置数据源

数据源就是连接池，就是不用创建连接池对象了，让Spring给咱们创建。

手动创建数据源

第一步：先导入依赖坐标，导入C3P0坐标和druid坐标，还有就是数据库驱动坐标，还有一个单元测试坐标

<dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.41</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.9</version>
        </dependency>

第二步：手动创建C3p0连接池，手动创建druid连接池

@Test
    public void testC3P0() throws Exception {

        ComboPooledDataSource dataSource = new ComboPooledDataSource();

        dataSource.setDriverClass("com.mysql.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
        dataSource.setUser("root");
        dataSource.setPassword("123456");

        Connection connection = dataSource.getConnection();

        System.out.println("C3P0获取到的连接地址" + connection);

        connection.close();

    }

    @Test
    public void testDruid() throws Exception {

        DruidDataSource dataSource = new DruidDataSource();

        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/mysql");
        dataSource.setUsername("root");
        dataSource.setPassword("123456");

        DruidPooledConnection connection = dataSource.getConnection();

        System.out.println("druid获取到的连接地址" + connection);

        connection.close();
    }

可以将字符串提取出来，写到配置文件中。
jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.username=root
jdbc.password=123456

@Test
    public void testDruid1() throws Exception {

//        加载类路径下的jdbc.properties
        ResourceBundle rb = ResourceBundle.getBundle("jdbc");

        DruidDataSource dataSource = new DruidDataSource();

        dataSource.setDriverClassName(rb.getString("jdbc.driver"));
        dataSource.setUrl(rb.getString("jdbc.url"));
        dataSource.setUsername(rb.getString("jdbc.username"));
        dataSource.setPassword(rb.getString("jdbc.password"));

        DruidPooledConnection connection = dataSource.getConnection();

        System.out.println("druid获取到的连接地址" + connection);

        connection.close();
    }

ComboPooledDataSource 对象也是可以使用Spring创建。

导入Spring坐标

<dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>4.2.4.RELEASE</version>
        </dependency>

配置applicationContext.xml文件

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test"></property>
        <property name="user" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>

写代码

@Test
    public void testC3p0() throws SQLException {

        ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");

        ComboPooledDataSource dataSource = (ComboPooledDataSource) app.getBean("dataSource");

        Connection connection = dataSource.getConnection();

        System.out.println(connection);

        connection.close();

    }

同时可以将数据抽出来。

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test"></property>
        <property name="user" value="root"></property>
        <property name="password" value="123456"></property>
    </bean>
-->
    <context:property-placeholder location="jdbc.properties"></context:property-placeholder>

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"></property>
        <property name="jdbcUrl" value="${jdbc.url}"></property>
        <property name="user" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>

</beans>

文章来源: blog.csdn.net，作者：花花叔叔，版权归原作者所有，如需转载，请联系作者。

原文链接：blog.csdn.net/qq_52077949/article/details/122796631