1.1MyBatis简介
MyBatis 是一个可以自定义SQL、存储过程和高级映射的持久层框架。MyBatis 摒除了大部分的JDBC代码、手工设置参数和结果集重获。MyBatis 只使用简单的XML 和注解来配置和映射基本数据类型、Map 接口和POJO 到数据库记录。相对Hibernate和Apache OJB等“一站式”ORM解决方案而言,Mybatis 是一种“半自动化”的ORM实现。
需要使用的Jar包:mybatis-3.0.2.jar(mybatis核心包)。mybatis-spring-1.0.0.jar(与Spring结合包)。
下载地址:
http://ibatis.apache.org/tools/ibator
http://code.google.com/p/mybatis/
1.2MyBatis+Spring+MySql简单配置
1.2.1搭建Spring环境
1,建立maven的web项目;
2,加入Spring框架、配置文件;
3,在pom.xml中加入所需要的jar包(spring框架的、mybatis、mybatis-spring、junit等);
4,更改web.xml和spring的配置文件;
5,添加一个jsp页面和对应的Controller;
6,测试。
可参照:http://limingnihao.iteye.com/blog/830409。使用Eclipse的Maven构建SpringMVC项目
1.2.2建立MySql数据库
建立一个学生选课管理数据库。
表:学生表、班级表、教师表、课程表、学生选课表。
逻辑关系:每个学生有一个班级;每个班级对应一个班主任教师;每个教师只能当一个班的班主任;
使用下面的sql进行建数据库,先建立学生表,插入数据(2条以上)。
更多sql请下载项目源文件,在resource/sql中。
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/* 建立数据库 */
CREATE DATABASE STUDENT_MANAGER;
USE STUDENT_MANAGER;
/***** 建立student表 *****/
CREATE TABLE STUDENT_TBL
(
STUDENT_ID VARCHAR(255) PRIMARY KEY,
STUDENT_NAME VARCHAR(10) NOT NULL,
STUDENT_SEX VARCHAR(10),
STUDENT_BIRTHDAY DATE,
CLASS_ID VARCHAR(255)
);
/*插入学生数据*/
INSERT INTO STUDENT_TBL (STUDENT_ID,
STUDENT_NAME,
STUDENT_SEX,
STUDENT_BIRTHDAY,
CLASS_ID)
VALUES ( 123456 ,
'某某某' ,
'女' ,
'1980-08-01' ,
121546
)
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创建连接MySql使用的配置文件mysql.properties。
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jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql: //localhost:3306/student_manager?user=root&password=limingnihao&useUnicode=true&characterEncoding=UTF-8
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1.2.3搭建MyBatis环境
顺序随便,现在的顺序是因为可以尽量的少的修改写好的文件。
1.2.3.1创建实体类: StudentEntity
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public class StudentEntity implements Serializable {
private static final long serialVersionUID = 3096154202413606831L;
private ClassEntity classEntity;
private Date studentBirthday;
private String studentID;
private String studentName;
private String studentSex;
public ClassEntity getClassEntity() {
return classEntity;
}
public Date getStudentBirthday() {
return studentBirthday;
}
public String getStudentID() {
return studentID;
}
public String getStudentName() {
return studentName;
}
public String getStudentSex() {
return studentSex;
}
public void setClassEntity(ClassEntity classEntity) {
this .classEntity = classEntity;
}
public void setStudentBirthday(Date studentBirthday) {
this .studentBirthday = studentBirthday;
}
public void setStudentID(String studentID) {
this .studentID = studentID;
}
public void setStudentName(String studentName) {
this .studentName = studentName;
}
public void setStudentSex(String studentSex) {
this .studentSex = studentSex;
}
}
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1.2.3.2创建数据访问接口
Student类对应的dao接口:StudentMapper。
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public interface StudentMapper {
public StudentEntity getStudent(String studentID);
public StudentEntity getStudentAndClass(String studentID);
public List<StudentEntity> getStudentAll();
public void insertStudent(StudentEntity entity);
public void deleteStudent(StudentEntity entity);
public void updateStudent(StudentEntity entity);
}
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1.2.3.3创建SQL映射语句文件
Student类的sql语句文件StudentMapper.xml
resultMap标签:表字段与属性的映射。
Select标签:查询sql。
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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" >
<mapper namespace= "com.manager.data.StudentMapper" >
<resultMap type= "StudentEntity" id= "studentResultMap" >
<id property= "studentID" column= "STUDENT_ID" />
<result property= "studentName" column= "STUDENT_NAME" />
<result property= "studentSex" column= "STUDENT_SEX" />
<result property= "studentBirthday" column= "STUDENT_BIRTHDAY" />
</resultMap>
<!-- 查询学生,根据id -->
<select id= "getStudent" parameterType= "String" resultType= "StudentEntity" resultMap= "studentResultMap" >
<![CDATA[
SELECT * from STUDENT_TBL ST
WHERE ST.STUDENT_ID = #{studentID}
]]>
</select>
<!-- 查询学生列表 -->
<select id= "getStudentAll" resultType= "com.manager.data.model.StudentEntity" resultMap= "studentResultMap" >
<![CDATA[
SELECT * from STUDENT_TBL
]]>
</select>
</mapper>
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1.2.3.4创建MyBatis的mapper配置文件
在src/main/resource中创建MyBatis配置文件:mybatis-config.xml。
typeAliases标签:给类起一个别名。com.manager.data.model.StudentEntity类,可以使用StudentEntity代替。
Mappers标签:加载MyBatis中实体类的SQL映射语句文件。
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<?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 alias= "StudentEntity" type= "com.manager.data.model.StudentEntity" />
</typeAliases>
<mappers>
<mapper resource= "com/manager/data/maps/StudentMapper.xml" />
</mappers>
</configuration>
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1.2.3.5修改Spring 的配置文件
主要是添加SqlSession的制作工厂类的bean:SqlSessionFactoryBean,(在mybatis.spring包中)。需要指定配置文件位置和dataSource。
和数据访问接口对应的实现bean。通过MapperFactoryBean创建出来。需要执行接口类全称和SqlSession工厂bean的引用。
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<!-- 导入属性配置文件 -->
<context:property-placeholder location= "classpath:mysql.properties" />
<bean id= "dataSource" class = "org.springframework.jdbc.datasource.DriverManagerDataSource" >
<property name= "driverClassName" value= "${jdbc.driverClassName}" />
<property name= "url" value= "${jdbc.url}" />
</bean>
<bean id= "transactionManager" class = "org.springframework.jdbc.datasource.DataSourceTransactionManager" >
<property name= "dataSource" ref= "dataSource" />
</bean>
<bean id= "sqlSessionFactory" class = "org.mybatis.spring.SqlSessionFactoryBean" >
<property name= "configLocation" value= "classpath:mybatis-config.xml" />
<property name= "dataSource" ref= "dataSource" />
</bean>
<!— mapper bean -->
<bean id= "studentMapper" class = "org.mybatis.spring.MapperFactoryBean" >
<property name= "mapperInterface" value= "com.manager.data.StudentMapper" />
<property name= "sqlSessionFactory" ref= "sqlSessionFactory" />
</bean>
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也可以不定义mapper的bean,使用注解:
将StudentMapper加入注解
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@Repository
@Transactional
public interface StudentMapper {
}
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对应的需要在dispatcher-servlet.xml中加入扫描:
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<bean class = "org.mybatis.spring.mapper.MapperScannerConfigurer" >
<property name= "annotationClass" value= "org.springframework.stereotype.Repository" />
<property name= "basePackage" value= "com.liming.manager" />
<property name= "sqlSessionFactory" ref= "sqlSessionFactory" />
</bean>
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1.2.4测试StudentMapper
使用SpringMVC测试,创建一个TestController,配置tomcat,访问index.do页面进行测试:
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@Controller
public class TestController {
@Autowired
private StudentMapper studentMapper;
@RequestMapping (value = "index.do" )
public void indexPage() {
StudentEntity entity = studentMapper.getStudent( "10000013" );
System.out.println( "name:" + entity.getStudentName());
}
}
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使用Junit测试:
使用Junit测试:
Java代码
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@RunWith (value = SpringJUnit4ClassRunner. class )
@ContextConfiguration (value = "test-servlet.xml" )
public class StudentMapperTest {
@Autowired
private ClassMapper classMapper;
@Autowired
private StudentMapper studentMapper;
@Transactional
public void getStudentTest(){
StudentEntity entity = studentMapper.getStudent( "10000013" );
System.out.println( "" + entity.getStudentID() + entity.getStudentName());
List<StudentEntity> studentList = studentMapper.getStudentAll();
for ( StudentEntity entityTemp : studentList){
System.out.println(entityTemp.getStudentName());
}
}
}
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以上所述是小编给大家介绍的MyBatis简介与配置MyBatis+Spring+MySql的方法,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!