1. Customer 表
CREATE TABLE `customer` (
`CUST_ID` int(10) unsigned NOT NULL AUTO_INCREMENT,
`NAME` varchar(100) NOT NULL,
`AGE` int(10) unsigned NOT NULL,
PRIMARY KEY (`CUST_ID`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
2. Customer模型
添加一个客户模型用来存储用户的数据。
package com.gp6.jdbc.bean;
public class Customer {
private int custId;
private String name;
private int age;
public Customer(int custId, String name, int age) {
this.custId = custId;
this.name = name;
this.age = age;
}
public int getCustId() {
return custId;
}
public void setCustId(int custId) {
this.custId = custId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
3. 数据访问对象 (DAO) 模式
package com.gp6.jdbc.dao;
import com.gp6.jdbc.bean.Customer;
public interface CustomerDAO {
public void insert(Customer customer);
public Customer findByCustomerId(int custId);
}
客户的DAO实现，使用 JDBC 发出简单的 insert 和 select SQL语句。
package com.gp6.jdbc.dao.impl;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;
import com.gp6.jdbc.bean.Customer;
import com.gp6.jdbc.dao.CustomerDAO;
public class CustomerDAOImpl implements CustomerDAO {
private DataSource dataSource;
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
public void insert(Customer customer){
String sql = "INSERT INTO " +
" CUSTOMER ( CUST_ID, NAME, AGE ) " +
"VALUES " +
"(?, ?, ?)";
Connection conn = null;
try {
conn = dataSource.getConnection();
PreparedStatement ps = conn.prepareStatement(sql);
ps.setInt(1, customer.getCustId());
ps.setString(2, customer.getName());
ps.setInt(3, customer.getAge());
ps.executeUpdate();
ps.close();
} catch (SQLException e) {
throw new RuntimeException(e);
} finally {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {}
}
}
}
public Customer findByCustomerId(int custId){
String sql = "SELECT * FROM CUSTOMER WHERE CUST_ID = ?";
Connection conn = null;
try {
conn = dataSource.getConnection();
PreparedStatement ps = conn.prepareStatement(sql);
ps.setInt(1, custId);
Customer customer = null;
ResultSet rs = ps.executeQuery();
if (rs.next()) {
customer = new Customer(rs.getInt("CUST_ID"),rs.getString("NAME"), rs.getInt("Age"));
}
rs.close();
ps.close();
return customer;
} catch (SQLException e) {
throw new RuntimeException(e);
} finally {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {}
}
}
}
}
4. Spring bean配置
创建 customerDAO 和数据源在 Spring bean 配置文件中。
File : Spring-Customer.xml
<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-2.5.xsd">
<bean id="customerDAO" class="com.gp6.jdbc.dao.impl.CustomerDAOImpl">
<property name="dataSource" ref="dataSource" />
</bean>
</beans>
File : Spring-Datasource.xml
<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-2.5.xsd">
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/study" />
<property name="username" value="root" />
<property name="password" value="123456" />
</bean>
</beans>
File : application.xml
<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-2.5.xsd">
<import resource="./Spring-Datasource.xml" />
<import resource="./Spring-Customer.xml" />
</beans>
5.项目结构
本实例完整目录结构。
Paste_Image.png
6.运行它
package com.gp6.jdbc;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.gp6.jdbc.bean.Customer;
import com.gp6.jdbc.dao.CustomerDAO;
public class Test {
public static void main( String[] args ) {
ApplicationContext context = new ClassPathXmlApplicationContext("com/gp6/jdbc/etc/applicationContext.xml");
CustomerDAO customerDAO = (CustomerDAO) context.getBean("customerDAO");
Customer customer = new Customer(1, "gp6",23);
customerDAO.insert(customer);
Customer customer1 = customerDAO.findByCustomerId(1);
System.out.println(customer1);
}
}
运行可能会报如下错误
log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Exception in thread "main" org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.springframework.jdbc.datasource.DriverManagerDataSource] for bean with name 'dataSource' defined in class path resource [com/gp6/jdbc/etc/Spring-Datasource.xml]; nested exception is java.lang.ClassNotFoundException: org.springframework.jdbc.datasource.DriverManagerDataSource
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1262)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:576)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1331)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:897)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:566)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
at com.gp6.jdbc.Test.main(Test.java:11)
Caused by: java.lang.ClassNotFoundException: org.springframework.jdbc.datasource.DriverManagerDataSource
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.springframework.util.ClassUtils.forName(ClassUtils.java:258)
at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:417)
at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1283)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1254)
... 9 more
是因为缺少jar包的缘故
将下面两个jar包引入
spring-jdbc-3.2.8.RELEASE
mysql-connector-java-5.1.29
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