spring整合mybatis 查询和更新示例
spring+mybatis+mysql
mybatis jar包 https://code.google.com/p/mybatis/downloads/list?can=3&q=Product%3DMyBatis
mybatis整合springjar包 https://code.google.com/p/mybatis/downloads/list?can=3&q=Product%3DSpring
首先创建数据库
CREATE TABLE emp ( id int) auto_increment, name varchar(20) NOT NULL, age int NOT NULL, PRIMARY KEY (id) ) ENGINE=INNODB;
新建一个web项目
创建一个数据库实体类
package entity;
import java.io.Serializable;
public class Emp implements Serializable {
private static final long serialVersionUID = 1311811898794089205L;
private Integer id;
private String name;
private Integer age;
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;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
}
创建EmpDao(接口)
package dao;
import entity.Emp;
public interface EmpDao {
public Emp getById(Integer id);
public void update(Emp emp);
}
创建mybatis配置文件(名字可以随便起 这里使用的是mybatis-config.xml)
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases >
<typeAlias type="entity.Emp" alias="emp"/><!-- 给实体类起别名 -->
</typeAliases>
<mappers>
<mapper resource="mapper/EmpDaoMapper.xml"/> <!-- 导入子配置文件 -->
</mappers>
</configuration>
创建EmpDaoMapper.xml(EmpDao配置文件)
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="dao.EmpDao"><!-- 指向dao接口 -->
<select id="getById" parameterType="Integer" resultType="entity.Emp">
<![CDATA[
select * from emp where id=#{id}
]]>
</select>
<update id="update" parameterType="emp"><!-- emp 是 Emp实体类的别名 在总配置文件(在这里指的是mybatis-config.xml)中定义 -->
<![CDATA[
update emp set name=#{name},age=#{age} where id=#{id}
]]>
</update>
</mapper>
创建EmpService(接口)
package service;
import entity.Emp;
public interface EmpService {
public Emp getById(Integer id);
public void update(Emp emp);
}
创建EmpServiceImpl(EmpService实现类)
package service.impl;
import dao.EmpDao;
import entity.Emp;
import service.EmpService;
public class EmpServiceImpl implements EmpService {
private EmpDao empDao;
@Override
public Emp getById(Integer id) {
return empDao.getById(id);
}
public void setEmpDao(EmpDao empDao) {
this.empDao = empDao;
}
@Override
public void update(Emp emp) {
empDao.update(emp);
}
}
创建spring配置文件
<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
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
">
<!-- 需要导入context命名空间 是用来读取jdbc属性文件 -->
<context:property-placeholder location="classpath:mysql.properties"/>
<!-- 第一种数据源 不用导jar包 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${driverClassName}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</bean>
<!-- 第二种方式配置数据源(dbcp方式) 需要导commons-pool.jar 和 commons-dbcp.jar
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="${driverClassName}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</bean>
-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="dataSource" ref="dataSource"/>
</bean>
<bean id="empDao" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="dao.EmpDao"/>
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
<bean id="empService" class="service.impl.EmpServiceImpl">
<property name="empDao" ref="empDao"/>
</bean>
</beans>
如果配置数据源时，想引用属性文件中的字段 可以新建一个属性文件
driverClassName=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/xx username=root password=
测试
package test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import entity.Emp;
import service.EmpService;
public class TestMyBatis {
public static void main(String[] args) {
ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
EmpService empService= (EmpService) ac.getBean("empService");
Emp emp=empService.getById(1);
System.out.println(emp.getName());
emp.setName("少年2");
empService.update(emp);
emp=empService.getById(1);
System.out.println("新名字"+emp.getName());
}
}
结果
少年 新名字少年2