Spring提供了强大的JDBC Template来操纵数据库。
先看一段线上实例代码：
/src/main/resource/conf/jdbc.properties:
driverClassName=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/preson_db?useUnicode=true&characterEncoding=gbk&autoReconnect=true
username=root
password=123
initialSize=1 <!--连接池启动时的初始值 -->
maxActive=500 <!-- 连接池的最大值-->
minIdle=1 <!--
/src/main/resource/conf/jdbcTemplate.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"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
<context:property-placeholder location="conf/jdbc.properties"/>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="${driverClassName}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
<!-- 连接池启动时的初始值 -->
<property name="initialSize" value="${initialSize}"/>
<!-- 连接池的最大值 -->
<property name="maxActive" value="${maxActive}"/>
<!-- 最大空闲值.当经过一个高峰时间后，连接池可以慢慢将已经用不到的连接慢慢释放一部分，一直减少到maxIdle为止 -->
<property name="maxIdle" value="${maxIdle}"/>
<!-- 最小空闲值.当空闲的连接数少于阀值时，连接池就会预申请去一些连接，以免洪峰来时来不及申请 -->
<property name="minIdle" value="${minIdle}"/>
</bean>
<bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<aop:config>
<aop:pointcut id="transactionPointcut" expression="execution(* cn.comp.service..*.*(..))"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="transactionPointcut"/>
</aop:config>
<tx:advice id="txAdvice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="get*" read-only="true" propagation="NOT_SUPPORTED"/>
<tx:method name="*"/>
</tx:attributes>
</tx:advice>
<bean id="fileService" class="com.koubei.syn.service.impl.FileServiceBean">
<property name="dataSource" ref="dataSource"/>
</bean>
</beans>
/src/main/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"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
<import resource="conf/quartz.xml"/>
<import resource="conf/jdbcTemplate.xml"/>
</beans>
POJO类：
package com.koubei.jdbctemplate;
/**
* Hello world!
*
*/
public class Person
{
private Integer id;
private String name;
public Person(){}
public Person(String name) {
this.name = name;
}
public Person(int id,String name){
this.id = id;
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
提供对Person的操作接口：PersonService.java
package com.koubei.jdbctemplate;
import java.util.List;
public interface PersonService {
public void save(Person person);
public void update(Person person);
public Person getPerson(Integer personid);
public List<Person> getPersons();
public void delete(Integer personid) throws Exception;
}
提供对接口的实现类：PersonServiceBean.java
package com.koubei.jdbctemplate;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.transaction.annotation.Propagation;
import org.springframework.transaction.annotation.Transactional;
@Transactional
public class PersonServiceBean implements PersonService {
private JdbcTemplate jdbcTemplate;
public void setDataSource(DataSource dataSource) {
this.jdbcTemplate = new JdbcTemplate(dataSource);
}
@Transactional(noRollbackFor=RuntimeException.class)
public void delete(Integer personid) throws Exception{
jdbcTemplate.update("delete from person where id=?", new Object[]{personid},
new int[]{java.sql.Types.INTEGER});
throw new RuntimeException("运行期例外");
}
@Transactional(propagation=Propagation.NOT_SUPPORTED)
public Person getPerson(Integer personid) {
return (Person)jdbcTemplate.queryForObject("select * from person where id=?", new Object[]{personid},
new int[]{java.sql.Types.INTEGER}, new PersonRowMapper());
}
@SuppressWarnings("unchecked")
public List<Person> getPersons() {
return (List<Person>)jdbcTemplate.query("select * from person", new PersonRowMapper());
}
public void save(Person person) {
jdbcTemplate.update("insert into person(id,name) values(?,?)", new Object[]{person.getId(),person.getName()},
new int[]{java.sql.Types.INTEGER,java.sql.Types.VARCHAR});
}
public void update(Person person) {
jdbcTemplate.update("update person set name=? where id=?", new Object[]{person.getName(), person.getId()},
new int[]{java.sql.Types.VARCHAR, java.sql.Types.INTEGER});
}
}
package com.koubei.jdbctemplate;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
public class PersonRowMapper implements RowMapper {
public Object mapRow(ResultSet rs, int index) throws SQLException {
Person person = new Person(rs.getString("name"));
person.setId(rs.getInt("id"));
return person;
}
}
测试类：
package com.koubei.jdbctemplate;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Test {
public static void main(String[] args) throws Exception {
String[] config={"beans.xml"};
PersonServiceBean person = (PersonServiceBean) new ClassPathXmlApplicationContext(config).getBean("personService");
Person person1 = new Person(1,"zhangsan");
person.save(person1);
}
}
需要引入的jar包有：
commons-logging.jar
commons-dbcp.jar
commons-collections.jar
jta.jar
aspectjweaver
aspectjrt
spring.jar