中途休息两天，有事情耽误了，果然成年人的世界，是不能好好学习的。打卡第三天。。。。继续加油。！！
Spring 配置数据源
1、数据源（连接池）的作用
提高程序性能
常见的数据源：DBCP,C3P0,BoneCp,Druid等
2、数据源的配置和使用
引入jar包
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<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>spring_anno</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.35</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.5</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.6</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.9</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.9</version>
<scope>test</scope>
</dependency>
</dependencies>
</project>DataSourceTest
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36package com.wwq;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidPooledConnection;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.junit.Test;
import java.sql.Connection;
public class DataSourceTest {
//手动创建druid数据源
public void test2() throws Exception {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/test");
dataSource.setName("root");
dataSource.setPassword("");
DruidPooledConnection connection = dataSource.getConnection();
System.out.println(connection);
connection.close();
}
//手动创建c2p0数据源
public void test1() throws Exception {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass("com.mysql.jdbc.Driver");
dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/");
dataSource.setUser("root");
dataSource.setPassword("");
Connection connection = dataSource.getConnection();
System.out.println(connection);
connection.close();
}
}
3、Spring配置数据源
applicationContext.xml
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<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"/>
<bean id="dataSouse" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
</beans>
jdbc.properties
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4jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.username=root
jdbc.password=DataSourceTest
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45package com.wwq;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidPooledConnection;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import javafx.application.Application;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import javax.annotation.Resource;
import javax.sql.DataSource;
import java.sql.Connection;
import java.util.ResourceBundle;
public class DataSourceTest {
//测试Spring容器产生数据源对象
public void test4() throws Exception {
ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
DataSource dataSouse = app.getBean("dataSouse", DataSource.class);
Connection connection = dataSouse.getConnection();
System.out.println(connection);
connection.close();
}
//手动创建c2p0数据源(加载properties配置文件)
public void test3() throws Exception {
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");
//创建数据源对象
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass(driver);
dataSource.setJdbcUrl(url);
dataSource.setUser(username);
dataSource.setPassword(password);
Connection connection = dataSource.getConnection();
System.out.println(connection);
connection.close();
}
}