Spring对持久层技术支持
JDBC : org.springframework.jdbc.core.JdbcTemplate
Hibernate3.0 : org.springframework.orm.hibernate3.HibernateTemplate
IBatis(MyBatis) : org.springframework.orm.ibatis.SqlMapClientTemplate
JPA : org.springframework.orm.jpa.JpaTemplate
开发JDBCTemplate入门
第一步:引入相应jar包
spring-tx-3.2.0.RELEASE.jar
spring-jdbc-3.2.0.RELEASE.jar
mysql驱动.
第二步:编写一个测试类
@Test
public void demo1(){
// 创建连接池:
DriverManagerDataSource dataSource = new DriverManagerDataSource();
// 设置参数:
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql:///spring3_day02");
dataSource.setUsername("root");
dataSource.setPassword("123");
// 使用JDBC的模板:
JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);
jdbcTemplate.execute("create table user (id int primary key auto_increment,name varchar(20))");
}
配置连接池
Spring默认的连接池
<!-- 配置Spring默认的连接池 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql:///spring3_day02"/>
<property name="username" value="root"/>
<property name="password" value="123"/>
</bean>
<!-- 定义jdbctemplate -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
</bean>
测试类
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class SpringTest1 {
@Autowired
@Qualifier("jdbcTemplate")
private JdbcTemplate jdbcTemplate;
@Test
public void demo2(){
jdbcTemplate.execute("create table user (id int primary key auto_increment,name varchar(20))");
}
}
DBCP连接池
导入jar包
com.springsource.org.apache.commons.dbcp-1.2.2.osgi.jar
com.springsource.org.apache.commons.pool-1.5.3.jar
<!-- 配置DBCP连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql:///spring3_day02"/>
<property name="username" value="root"/>
<property name="password" value="123"/>
</bean>
C3P0连接池
导入jar包
com.springsource.com.mchange.v2.c3p0-0.9.1.2.jar
<!-- 配置c3p0连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="com.mysql.jdbc.Driver"/>
<property name="jdbcUrl" value="jdbc:mysql:///spring3_day02"/>
<property name="user" value="root"/>
<property name="password" value="123"/>
</bean>
参数设置到属性文件中
在src下创建jdbc.properties
jdbc.driver = com.mysql.jdbc.Driver
jdbc.url = jdbc:mysql:///spring3_day02
jdbc.user = root
jdbc.password = 123
需要在applicationContext.xml 中使用属性文件配置的内容.
第一种写法
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties"></property>
</bean>
第二种写法(需要引入context标签的头)
<context:property-placeholder location="classpath:jdbc.properties"/>
案例
<?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">
<!--
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties"></property>
</bean>
-->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 配置c3p0连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!-- 定义jdbctemplate -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
</bean>
</beans>
JdbcTemplate的CRUD的操作
Spring框架中提供了对持久层技术支持的类
JDBC : org.springframework.jdbc.core.support.JdbcDaoSupport
Hibernate 3.0 : org.springframework.orm.hibernate3.support.HibernateDaoSupport
iBatis : org.springframework.orm.ibatis.support.SqlMapClientDaoSupport
<?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">
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 配置c3p0连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!-- 定义jdbctemplate -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="userDao" class="cn.yzu.spring3.demo2.UserDao">
<property name="jdbcTemplate" ref="jdbcTemplate"/>
</bean>
</beans>
public class UserDao extends JdbcDaoSupport{
public void add(User user){
String sql = "insert into user values (null,?)";
this.getJdbcTemplate().update(sql, user.getName());
}
public void update(User user){
String sql = "update user set name = ? where id = ?";
this.getJdbcTemplate().update(sql, user.getName(),user.getId());
}
public void delete(User user){
String sql = "delete from user where id = ?";
this.getJdbcTemplate().update(sql, user.getId());
}
public int findCount(){
String sql = "select count(*) from user";
return this.getJdbcTemplate().queryForInt(sql);
}
public String findNameById(int id){
String sql = "select name from user where id = ?";
return this.getJdbcTemplate().queryForObject(sql, String.class, id);
}
public User findById(int id){
String sql = "select * from user where id = ?";
User user = this.getJdbcTemplate().queryForObject(sql, new UserRowMapper(), id);
return user;
}
public List<User> findAll(){
String sql = "select * from user";
return this.getJdbcTemplate().query(sql, new UserRowMapper());
}
class UserRowMapper implements RowMapper<User>{
/**
* rs:结果集.
* rowNum:行号
*/
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
User user = new User();
user.setId(rs.getInt("id"));
user.setName(rs.getString("name"));
return user;
}
}
}