仰天大笑出门去,我辈岂是蓬蒿人。这篇文章主要讲述Spring整合MyBatis (使用扫描包配置mapper代理)相关的知识,希望能为你提供帮助。
Spring整合MyBatis (使用扫描包配置mapper代理)
pojo是根据表生成的实体类,属性名要跟字段名相同,不相同sql语句查询时用别名。
首先导jar包
实体类
public class User {
private Integer id;
private String username;
// 用户姓名
private String sex;
// 性别
private Date birthday;
// 生日
private String address;
// 地址
}
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编写MyBatis配置文件SqlMapConfig.xml(虽然里面可以什么也不写除了头,但是必须有)。
<
?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>
<
/configuration>
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编写Spring 配置文件applicationContext.xml
(
db.properties:文件里面放的是连接数据库的相关信息。
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/t003?characterEncoding=utf-8
jdbc.username=test01
jdbc.password=
)
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<
?xml version="1.0" encoding="UTF-8"?>
<
beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
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-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">
<
!-- 加载配置文件 -->
<
context:property-placeholder location="classpath:db.properties" />
<
!-- 数据库连接池 -->
<
bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<
property name="driverClassName" value="https://www.songbingjia.com/android/${jdbc.driver}" />
<
property name="url" value="https://www.songbingjia.com/android/${jdbc.url}" />
<
property name="username" value="https://www.songbingjia.com/android/${jdbc.username}" />
<
property name="password" value="https://www.songbingjia.com/android/${jdbc.password}" />
<
property name="maxActive" value="https://www.songbingjia.com/android/10" />
<
property name="maxIdle" value="https://www.songbingjia.com/android/5" />
<
/bean>
<
!-- sqlSessonFactory的配置 -->
<
bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<
!-- 配置数据库连接池 -->
<
property name="dataSource" ref="dataSource">
<
/property>
<
!-- 加载配置文件 -->
<
property name="configLocation" value="https://www.songbingjia.com/android/classpath:SqlMapConfig.xml">
<
/property>
<
/bean>
<
bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" >
<
property name="basePackage" value="https://www.songbingjia.com/android/cn.test" />
<
/bean>
<
/beans>
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<
?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">
<
!-- namespace是命名空间,作用sql语句的隔离,后面还有重要作用 #{}作用就是占位符,相当于jdbc的“?” parameterType:查询的参数类型
resultType:查询结果的数据类型,如果给pojo应该给全路径。 -->
<
!-- mapper代理的开发规则: 1、namespace必须时候接口的全限定名 2、Statementid必须和接口的方法名称一致 3、接口方法的参数类型要和parameterType要一致
4、接口方法的返回值类型要和resultType一致 -->
<
mapper namespace="cn.test.mybatis.po.UserMapper">
<
!-- 别名不区分大小写 -->
<
select id="getUserById" parameterType="int" resultType="cn.test.mybatis.po.User">
SELECT * FROM `user` WHERE id=#{id};
<
/select>
<
!-- 如果查询结果返回list, resultType设置为list中一个元素的数据类型 ${}字符串拼接指令 -->
<
select id="getUserByName" parameterType="string"
resultType="cn.test.mybatis.po.User">
SELECT * FROM `user` WHERE username LIKE ‘%${value}%‘
<
/select>
<
!--美丽的分界线 只测试最简单的上边两个方法-->
<
!-- 参数为pojo时,#{}中的名称就是pojo的属性 -->
<
!-- <
insert id="insertUser" parameterType="cn.test.mybatis.po.User">
keyProperty:对于pojo的主键属性 resultType:对应主键的数据类型 order:是在insert语句执行之前或者之后。
如果使用uuid做主键,应该先生成主键然后插入数据,此时应该使用Before
<
selectKey keyProperty="id" resultType="int" order="AFTER">
SELECT LAST_INSERT_ID()
<
/selectKey>
INSERT into user (username,birthday,sex,address)
values (#{username}, #{birthday}, #{sex}, #{address})
<
/insert>
-->
<
!-- <
select id="getUserByQueryVo" parameterType="queryvo"
resultType="user">
SELECT * FROM `user` WHERE id=#{user.id};
<
/select>
-->
<
!-- 查询用户表中的记录数 -->
<
!-- <
select id="getUserCount" resultType="int">
SELECT count(*) FROM `user`
<
/select>
<
sql id="find_user_list_where">
<
where>
<
if test="id!=null">
and id=#{id}
<
/if>
<
if test="username != null and username != ‘‘">
and username like ‘%${username}%‘
<
/if>
<
/where>
<
/sql>
<
sql id="user_field_list">
id,username,birthday,sex,address
<
/sql>
-->
<
!--<
select id="findUserList" parameterType="user" resultType="user">
select
<
include refid="user_field_list" />
from user
<
include refid="find_user_list_where" />
<
/select>
-->
<
!-- 动态sql foreach测试 -->
<
!-- <
select id="findUserByIds" parameterType="queryvo" resultType="user">
SELECT
<
include refid="user_field_list" />
FROM `user`
<
where>
and id in(1,10,20,21,31)
<
foreach collection="ids" item="id" open="and id in(" close=")"
separator=",">
#{id}
<
/foreach>
<
/where>
<
/select>
-->
<
/mapper>
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public class MyBatisTest {private ApplicationContext applicationContext;
@Before
public void init() throws Exception {
// 初始化spring容器
applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
}@Test
public void testFindUserById() {
UserMapper userMapper = applicationContext.getBean(UserMapper.class);
List<
User>
user = userMapper.getUserByName("王五");
for (User user2 : user) {System.out.println(user2.getUsername());
}
}@Test
public void test() {
UserMapper userMapper = applicationContext.getBean(UserMapper.class);
User userById = userMapper.getUserById(1);
System.out.println(userById);
}
}
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