目录

4.1数据源的开发步骤

4.2手动创建数据源

4.3抽取jdbc.properties配置文件  配置数据源

4.4Spring配置数据源 

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4.1数据源的开发步骤

1）导入数据源的坐标和对应的数据库驱动坐标

2）创建数据源对象

3）设置数据源的基本连接数据

4）使用数据源获取连接资源和关闭连接资源

4.2手动创建数据源

在创建之前先导入数据源的坐标

<dependencies>
  <dependency>
    <groupId>c3p0</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.1.2</version>
  </dependency>
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.1.10</version>
  </dependency>
  <!-- mysql驱动 -->
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.17</version>
  </dependency>
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.13.2</version>
    <scope>test</scope>
  </dependency>
</dependencies>

手动配置druid、c3p0数据源

package com.hzw.test;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidPooledConnection;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.junit.Test;
import java.beans.PropertyVetoException;
import java.sql.Connection;
import java.sql.SQLException;

public class DataSourceTest {
    //测试手动设置druid数据源
    @Test
    public void test2() throws SQLException {
        DruidDataSource druidDataSource = new DruidDataSource();
       druidDataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");
       druidDataSource.setUrl("jdbc:mysql://localhost:3306/cloud-user?useSSL=false&serverTimezone=Asia/Shanghai");
       druidDataSource.setUsername("root");
       druidDataSource.setPassword("root");
        DruidPooledConnection connection = druidDataSource.getConnection();
        System.out.println(connection);
    }
    //手动创建c3p0数据源
    @Test
    public void test1() throws Exception {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass("com.mysql.cj.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/cloud-user?useSSL=false&serverTimezone=Asia/Shanghai");
        dataSource.setUser("root");
        dataSource.setPassword("root");
      //获取数据源
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        connection.close();
    }
}

4.3抽取jdbc.properties配置文件  配置数据源

jdbc.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/cloud-user?useSSL=false&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=root

//手动创建c3p0数据源(加载propertise配置文件)
@Test
public void test3() throws Exception {
    //读取配置文件
    ResourceBundle rb=ResourceBundle.getBundle("jdbc");
    String driver = rb.getString("jdbc.driver");
    String url = rb.getString("jdbc.url");
    String username = rb.getString("jdbc.username");
    String password = rb.getString("jdbc.password");
    //创建数据源 设置连接数
    ComboPooledDataSource dataSource = new ComboPooledDataSource();
    dataSource.setDriverClass(driver);
    dataSource.setJdbcUrl(url);
    dataSource.setPassword(password);
    dataSource.setUser(username);

    Connection connection = dataSource.getConnection();
    System.out.println(connection);
    connection.close()；

4.4Spring配置数据源 

1.引入对应的依赖

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-context</artifactId>
  <version>5.1.5.RELEASE</version>
</dependency>

2.配置对应Bean 这里是c3p0数据源

<?xml version="1.0" encoding="UTF-8"?>
<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">

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.cj.jdbc.Driver"></property>
    <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/cloud-user?serverTimezone=Asia/Shanghai"></property>
    <property name="password" value="root"></property>
        <property name="user" value="root"></property>
    </bean>
</beans>

3.getBean 获取对应数据源对象

//测试Spring容器创建c3p0数据源
@Test
public void test4() throws Exception {
    ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
    DataSource dataSource = applicationContext.getBean(DataSource.class);
    Connection connection = dataSource.getConnection();
    System.out.println(connection);
    connection.close();
}

4.抽取jdbc配置文件

applicatinContext.xml加载jdbc.properties配置文件获取连接信息

首先，需要引入context命名空间阿约束路径

<?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">
<!--加载外部的properties文件-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
<!--通过key 加载值-->
    <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="password" value="${jdbc.password}"></property>
        <property name="user" value="${jdbc.username}"></property>
    </bean>
</beans>

4.测试连接成功