mybatis接入spring-boot
開發(fā)環(huán)境為idea，spring-boot項(xiàng)目，前期的準(zhǔn)備就跳過了
pom.xml配置
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.0</version>
</dependency>
首先是注解方式
application.yml配置
此處已配置完數(shù)據(jù)庫
spring:
profiles:
active: dev
datasource:
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/test
jpa:
hibernate:
ddl-auto: update
show-sql: true
首先注冊(cè)dao的接口
首先貼出bean
@Entity
public class Person {
@Id
@GeneratedValue
private int id;
private String name;
@Min(value=10,message = "too young")
private int age;
public Person(){
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
接下來是dao類
@Component
@Mapper
public interface PersonAnnotationDao {
@Select("SELECT * FROM person")
List<Person> findAll();
}
這里只是簡單的做了一個(gè)查詢方法
最后我們進(jìn)行junit test
具體的spring 單元測試請(qǐng)自行搜索
@Autowired
private PersonAnnotationDao personAnnotationDao;
@Test
public void testMyBatisFindAllPersons() {
Assert.assertEquals(1, personMapper.findAllPersons().size());
}
這里可以調(diào)試調(diào)取具體的數(shù)據(jù)
接下來看看xml方式的調(diào)用
application.yml配置
此處已配置完數(shù)據(jù)庫
mybatis:
mapper-locations: classpath:mybatis/mapper/*.xml
type-aliases-package: com.leo.domain
config-location: classpath:mybatis/mybatis-config.xml
注意路徑resources的子目錄為第一級(jí)目錄
配置mybatis-config.xml
<settings>
<setting name="cacheEnabled" value="true"/>
<setting name="lazyLoadingEnabled" value="true"/>
<setting name="multipleResultSetsEnabled" value="true"/>
<setting name="useColumnLabel" value="true"/>
<setting name="useGeneratedKeys" value="false"/>
<setting name="autoMappingBehavior" value="PARTIAL"/>
<setting name="autoMappingUnknownColumnBehavior" value="WARNING"/>
<setting name="defaultExecutorType" value="SIMPLE"/>
<setting name="defaultStatementTimeout" value="25"/>
<setting name="defaultFetchSize" value="100"/>
<setting name="safeRowBoundsEnabled" value="false"/>
<setting name="mapUnderscoreToCamelCase" value="false"/>
<setting name="localCacheScope" value="SESSION"/>
<setting name="jdbcTypeForNull" value="OTHER"/>
<setting name="lazyLoadTriggerMethods" value="equals,clone,hashCode,toString"/>
</settings>
相關(guān)屬性及意義請(qǐng)參考官方文檔
創(chuàng)建mapper接口
@Component
@Mapper
public interface PersonMapper {
List<Person> findAllPersons();
Person findById(int id);
void insertPerson(int age,String name);
}
這@Component->注入到spring容器中，使用的時(shí)候就可以不手動(dòng)初始化
@Mapper->聲明這是一個(gè)Mybatis的操作類，會(huì)被掃描到
配置mapper.xml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="com.leo.mapper.PersonMapper">
<resultMap id="person" type="Person">
<id property="id" column="id"/>
<result property="age" column="age"/>
<result property="name" column="name"/>
</resultMap>
<select id="findAllPersons" resultType="Person">
SELECT *
FROM person
</select>
<select id="findById" resultType="Person">
SELECT * FROM person WHERE id=#{id}
</select>
<insert id="insertPerson" keyProperty="id">
insert into person(age,name) values(#{age},#{name})
</insert>
</mapper>
文件頭可復(fù)制
mapper-namespace:與xml對(duì)應(yīng)的java文件的全限定名
resultMapr:一個(gè)封裝的結(jié)構(gòu)，可以組合復(fù)雜的返回類型提供下面的sql調(diào)用
<select>節(jié)點(diǎn):對(duì)應(yīng)上面mapper類的查詢方法
<insert>,<update>...對(duì)應(yīng)相應(yīng)的sql方法
select-id:對(duì)應(yīng)mapper類內(nèi)的方法名
select-resultType:對(duì)用返回類型，注意這里沒有集合類，可以用集合類的基本元素填入
select-resultMap:返回類型即為上訴定義的復(fù)雜類型
具體的完整屬性介紹
官方文檔-mapper配置
