Spring连接数据库
使用spring操作数据库是非常简单的,无论是配置还是操作,最近工作要用到就问同事如何操作了,具体的细
节还要日后慢慢学习,先贴出如何使用.
1.建立数据源,也就是一个xml配置文件 resource/applicationContext.xml
==============================================
<?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-2.0.xsd">
<!-- 这里是用来配置连接数据库基础信息的,用JDBC链接 -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName">
<value>com.mysql.jdbc.Driver</value>
</property>
<property name="url">
<value>
jdbc:mysql://10.100.100.110:3306/HotelDB
</value>
</property>
<property name="username">
<value>root</value>
</property>
<property name="password">
<value>password</value>
</property>
</bean>
<!-- 这里根据spring的注入原理直接把参数放到ConnectionProvider -->
<!-- 到时候通过id就直接调用ConnectionProvider对象-->
<bean id="com.badpeas.ConnectionProvider"
class="hotel.information.peohotel.dbutil.ConnectionProvider">
<property name="dataSource">
<!-- ref元素用来将容器内其它bean的id传给<constructor-arg/> 或 <property/>元素 -->
<!-- 同时提供错误验证功能 -->
<ref bean="dataSource" />
</property>
</bean>
</beans>
==============================================
2.建立方法类 com/badpeas/dbutil/ConnectionProvider.java
==============================================
package com.badpeas.dbutil;
import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;
/**
* 连接数据库和获取数据源的普通类
* @author badpeas
*
*/
public class ConnectionProvider {
private DataSource dataSource = null;
public DataSource getDataSource() {
return dataSource;
}
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
/*
* 这个方法用来连接数据库.
*/
public Connection getConnection() throws SQLException{
if (dataSource == null){
return null;
}
return dataSource.getConnection();
}
}
==============================================
3.建立工厂类去实现连接和获取数据源的工作 com/badpeas/dbutil/ConnectionFactory.java
==============================================
package com.badpeas.dbutil;
import java.sql.Connection;
import java.sql.SQLException;
import javax.sql.DataSource;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
/**
* 利用spring统一管理连接数据库和获取数据源
* @author badpeas
*
*/
public class ConnectionFactory {
// 访问xml,获取上下文context
private static ApplicationContext context;
private static final String CONFIG_FILE = "resource/applicationContext.xml";
static {
context = new ClassPathXmlApplicationContext(CONFIG_FILE);
}
// 通过在xml中指定的id获得bean对象,然后获取连接
public static Connection getConnection() throws BeansException,
SQLException {
return ((ConnectionProvider) context
.getBean("com.badpeas.ConnectionProvider")).getConnection();
}
// 通过在xml中指定的id获得bean对象,然后获取数据源
public static DataSource getDataSource() {
return ((ConnectionProvider) context
.getBean("com.badpeas.ConnectionProvider")).getDataSource();
}
}
==============================================
4.建立DAO类,统一管理数据库的操作方法 com/badpeas/DAO/BadpeasDataSourceDAO.java
==============================================
package com.badpeas.DAO;
import hotel.information.bean.Location;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
/**
* 操作数据库的类
* @author badpeas
*
*/
public class PeoHotelLoactionDAO {
private JdbcTemplate jt = null;
// 静态方法获取dataSource
private static DataSource dataSource = null;
static {
dataSource = hotel.information.peohotel.dbutil.ConnectionFactory
.getDataSource();
}
// 初始化的时候实例化JdbcTemplate,后面用来实现数据库序列化.
public PeoHotelLoactionDAO() {
this.jt = new JdbcTemplate(dataSource);
}
// 按bookCode查询
public Book findBook(String bookCode) {
String sql = "select bookId,bookName from BookDB where bookCode=?";
RowMapper mapper = new RowMapper() {
public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
Book book = new Book();
book.setBookId(rs.getString("bookId"));
book.setBookName(rs.getString("bookName"));
return book;
}
};
List<Book> list = jt.query(sql, new Object[] { bookCode }, mapper);
Book bookResult = (Book)list.get(0);
return bookResult;
}
//查询所有Book
public List<Book> findBookList() {
String sql = "select bookId,bookName from BookDB ";
RowMapper mapper = new RowMapper() {
public Object mapRow(ResultSet rs, int rowNum) throws SQLException {
Book book = new Book();
book.setBookId(rs.getString("bookId"));
book.setBookName(rs.getString("bookName"));
return book;
}
};
List list = jt.query(sql, new Object[] {}, mapper);
return list;
}
}
==============================================
5.数据源对象 com/badpeas/bean/Book.java
==============================================
package com/badpeas/bean;
import java.io.Serializable;
/**
* 书籍bean
* @author badpeas
*
*/
public class Book implements Serializable{
private String bookId;
private String bookName;
public String getBookId() {
return bookId;
}
public void setBookId(String bookId) {
this.bookId = bookId;
}
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
}
==============================================
这里我的数据库是采用mySQL,调用的是我的BookDB表,采用的是JDBC链接,其他数据库和方式基本类同!
操作数据库的时候直接在要操作的类里面调用DAO类的方法就可以了.