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<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" >
<!-- 读取配置文件 -->
<bean
class= "org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" >
<property name= "locations">
<value> classpath:jdbc.properties</value >
</property>
</bean >
<!--数据源 -->
<bean id="dataSource" destroy-method="close"
class= "org.apache.commons.dbcp.BasicDataSource" >
<property name= "driverClassName" value="${jdbc.driverClassName}" />
<property name= "url" value ="${jdbc.url}" />
<property name= "username" value="${jdbc.username}" />
<property name= "password" value="${jdbc.password}" />
</bean >
<!--方法一 继承JdbcDaoSupport -->
<bean id="classesDao" class="cn.itheima03.spring.jdbc.ClassesDaoImpl" >
<property name= "dataSource">
<ref bean= "dataSource"/>
</property>
</bean >
<!--方法二 引入JdbcTemplate，即让JdbcTemplate变成dao的成员变量-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" >
<constructor-arg index= "0" ref="dataSource" ></constructor-arg>
</bean >
<bean id="classesDao2" class="cn.itheima03.spring.jdbc.ClassesDaoImpl2" >
<property name= "jdbcTemplate">
<ref bean= "jdbcTemplate"/>
</property>
</bean >
<!--方法三 继承JdbcTemplate，需要在构造方法中提供数据源 -->
<bean id="classesDao3" class="cn.itheima03.spring.jdbc.ClassesDaoImpl3" >
<constructor-arg index= "0" ref="dataSource" ></constructor-arg>
</bean >
<!-- 方法四 自定义模板 -->
<bean id="itheimaTemplate" class="cn.itheima03.spring.itheima03db.ItHeimaTemplate" >
<constructor-arg index= "0" ref="dataSource" ></constructor-arg>
</bean >
<bean id="classesDao4" class="cn.itheima03.spring.itheima03db.ClassesDaoImpl4" >
<constructor-arg index= "0" ref="dataSource" ></constructor-arg>
</bean >
</beans>
==============================================
位于src目录下的配置文件:jdbc.properties
jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc\:mysql \://localhost\:3306/hibernate_itheima03
jdbc.username=root
jdbc.password=root
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/*
* 方式一：继承JdbcDaoSupport,需要使用数据源，在配置文件中应该配置。
*/
public class ClassesDaoImpl extends JdbcDaoSupport implements ClassesDao{
public void saveClasses()
{
this.getJdbcTemplate().execute("insert
into classes(cname,description) values(‘a‘,‘a‘)");
}
@Override
public List<Classes>
getClasses() {
return this .getJdbcTemplate().query("select
* from classes", new ClassesRowMapper()) ;
}
}
===================================================
/**
* 方式二:引入JdbcTemplate
*/
public class ClassesDaoImpl2 implements ClassesDao{
private JdbcTemplate jdbcTemplate;
public JdbcTemplate
getJdbcTemplate() {
return jdbcTemplate ;
}
public void setJdbcTemplate(JdbcTemplate
jdbcTemplate) {
this.jdbcTemplate =
jdbcTemplate;
}
public void saveClasses()
{
this.jdbcTemplate .execute("insert
into classes(cname,description) values(‘a‘,‘a‘)");
}
@Override
public List<Classes>
getClasses() {
return null ;
}
}
===================================================
/**
* 方式三：继承JdbcTemplate,写一个以DataSource作为参数的构造函数。
*/
public class ClassesDaoImpl3 extends JdbcTemplate implements ClassesDao{
public ClassesDaoImpl3(DataSource
dataSource){
super(dataSource);
}
public void saveClasses()
{
this.execute("insert
into classes(cname,description) values(‘a‘,‘a‘)");
}
@Override
public List<Classes> getClasses()
{
return null;
}
}
===================================================
/**
* 方式四：自定义模板。
*
* 在spring内部完成是面向接口编程
* 在spring的配置文件中,通过set方法或者构造器，给接口注入实现的类
*
*/
public class ItHeimaTemplate
{
private DataSource dataSource;
public DataSource
getDataSource() {
return dataSource ;
}
public void setDataSource(DataSource
dataSource) {
this.dataSource =
dataSource;
}
public ItHeimaTemplate(){}
public ItHeimaTemplate(DataSource
dataSource){
this.dataSource =
dataSource;
}
/**
* 实现插入数据
*/
public void insert(String
sql){
try {
Connection conn = this.dataSource .getConnection();
Statement statement = conn.createStatement();
statement.executeUpdate(sql);
} catch (Exception
e) {
}
}
}
---------------------------------------------------
public class ClassesDaoImpl4 extends ItHeimaTemplate{
public ClassesDaoImpl4(DataSource
dataSource){
super(dataSource);
}
public void insert(){
this.insert("insert
into classes(cname,description) values(‘a‘,‘a‘)");
}
}
===================================================
public class DataSourceTest
{
@Test
public void testDataSource(){
ApplicationContext context = new ClassPathXmlApplicationContext("cn/itheima03/spring/jdbc/applicationContext.xml" );
DataSource dataSource = (DataSource)context.getBean("dataSource" );
System. out.println(dataSource);
}
}
===================================================
/**
* 查询时，需要写一个类实现RowMapper
*/
public class ClassesRowMapper implements RowMapper{
@Override
public Object
mapRow(ResultSet rs, int rowNum) throws SQLException
{
Classes classes = new Classes();
classes.setCid(rs.getLong( "cid"));
classes.setCname(rs.getString( "cname"));
classes.setDescription(rs.getString( "description"));
return classes;
}
}
===================================================
public class ClassesDaoTest
{
@Test
public void testSaveClasses(){
ApplicationContext context = new ClassPathXmlApplicationContext("cn/itheima03/spring/jdbc/applicationContext.xml" );
ClassesDao classesDao = (ClassesDao)context.getBean("classesDao3" );
classesDao.saveClasses();
}
@Test
public void testSaveClasses4(){
ApplicationContext context = new ClassPathXmlApplicationContext("cn/itheima03/spring/jdbc/applicationContext.xml" );
ClassesDaoImpl4 classesDao = (ClassesDaoImpl4)context.getBean("classesDao4" );
classesDao.insert();
}
/**
* 测试查询
*/
@Test
public void testGetClasses(){
ApplicationContext context = new ClassPathXmlApplicationContext("cn/itheima03/spring/jdbc/applicationContext.xml" );
ClassesDao classesDao = (ClassesDao)context.getBean("classesDao" );
System. out.println(classesDao.getClasses().size());
}
}
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版权声明：本文为博主原创文章，未经博主允许不得转载。
原文地址：http://blog.csdn.net/damogu_arthur/article/details/46988425
