6、spring数据库操作
1.目录结构:
2.数据表结构:
3.代码如下:
Person.java
package db.entity;
public class Person {
private String username;
private String password;
public Person(){}
public Person(String username) {
this.username = username;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}PersonService.java
package db.service;
import java.util.List;
import db.entity.Person;
public interface PersonService {
public void save(Person person);
public void update(Person person);
public Person getPerson(String username);
public List<Person> getPersons();
public void delete(String uersname);
}PersonServiceBean.java
package db.service.impl;
import java.util.List;
import javax.sql.DataSource;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.transaction.annotation.Transactional;
import db.entity.Person;
import db.service.PersonService;
@Transactional
public class PersonServiceBean implements PersonService {
private JdbcTemplate jdbcTemplate;
public void setDataSource(DataSource dataSource) {
this.jdbcTemplate = new JdbcTemplate(dataSource);
}
@Override
public void save(Person person) {
// TODO Auto-generated method stub
jdbcTemplate.update("insert into s1 (username, password) values(?, ?)", new Object[] {person.getUsername(), person.getPassword()},
new int[] {java.sql.Types.VARCHAR, java.sql.Types.VARCHAR});
}
@Override
public void update(Person person) {
jdbcTemplate.update("update s1 set password=? where username=?", new Object[]{person.getPassword(), person.getUsername()},
new int[]{java.sql.Types.VARCHAR, java.sql.Types.VARCHAR});
}
@SuppressWarnings("unchecked")
@Override
public Person getPerson(String username) {
return (Person) jdbcTemplate.queryForObject("select * from s1 where username=?", new Object[]{username},
new int[] {java.sql.Types.VARCHAR}, new PersonRowManager());
}
@SuppressWarnings("unchecked")
@Override
public List<Person> getPersons() {
// TODO Auto-generated method stub
return (List<Person>) jdbcTemplate.query("select * from s1", new PersonRowManager());
}
@Override
public void delete(String uersname) {
jdbcTemplate.update("delete from s1 where username=?", new Object[]{uersname},
new int[]{java.sql.Types.VARCHAR});
}
}PersonRowManager.java
package db.service.impl;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
import db.entity.Person;
public class PersonRowManager implements RowMapper{
@Override
public Object mapRow(ResultSet rs, int index) throws SQLException {
// TODO Auto-generated method stub
Person person = new Person(rs.getString("username"));
person.setPassword(rs.getString("password"));
return person;
}
}
PersonServiceBeanTest.java
package db.junit;
import static org.junit.Assert.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import db.entity.Person;
import db.service.PersonService;
public class PersonServiceBeanTest {
private PersonService personService;
@Before
public void setUp() throws Exception {
try {
ApplicationContext cxt = new ClassPathXmlApplicationContext("beans.xml");
personService = (PersonService) cxt.getBean("personService");
} catch (RuntimeException e) {
e.printStackTrace();
}
}
@After
public void tearDown() throws Exception {
}
@Test
public void testSetDataSource() {
fail("Not yet implemented");
}
@Test
public void testSave() {
Person person = new Person("wxt");
person.setPassword("3546832");
System.out.println(person.getUsername() + " " + person.getPassword());
personService.save(person);
}
@Test
public void testUpdate() {
Person person = new Person("zmp");
person.setPassword("changed");
personService.update(person);
}
@Test
public void testGetPerson() {
Person person = personService.getPerson("zmp");
System.out.println(person.getUsername());
}
@Test
public void testGetPersons() {
for(Person person : personService.getPersons()){
System.out.println(person.getUsername());
}
}
@Test
public void testDelete() {
personService.delete("zmpandzmp");
}
}4.配置如下:
beans.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-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<context:property-placeholder location="classpath: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>
<tx:annotation-driven transaction-manager="txManager"/>
<bean id="personService" class="db.service.impl.PersonServiceBean">
<property name="dataSource" ref="dataSource"/>
</bean>
</beans>jdbc.properties
driverClassName=org.gjt.mm.mysql.Driver
url=jdbc\:mysql\://localhost\:3306/spring?useUnicode\=true&characterEncoding\=UTF-8
username=root
password=123456
initialSize=1
maxActive=500
maxIdle=2
minIdle=15.运行结果如下(只测试getPersons()方法):
与数据库的内容比较:
