Spring整合Mybatis实例
2021/10/18 23:16:36
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Spring整合mybatis
1、创建数据库springdb,新建表Student
2、新建maven项目,选maven-archetype-quickstart
Groupid:com.bjpowernode
3、删除默认创建的App类文件以及AppTest测试文件<不删也可以>
4、pom.xml文件中加入依赖
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.bjpowernode</groupId> <artifactId>spring_mybatis</artifactId> <version>1.0-SNAPSHOT</version> <name>spring_mybatis</name> <!-- FIXME change it to the project's website --> <url>http://www.example.com</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> </properties> <dependencies> <!--单元测试--> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <!--Spring核心ioc--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>5.2.5.RELEASE</version> </dependency> <!--做spring事务用到的--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>5.2.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.2.5.RELEASE</version> </dependency> <!--mybatis依赖--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.1</version> </dependency> <!--mybatis和spring集成的依赖,由mybatis提供--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency> <!--mybatis驱动--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.9</version> </dependency> <!--阿里公司数据库连接池--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.12</version> </dependency> </dependencies> <build> <!--目的是把src/main/java目录中的xml文件包含到输出结果中。输出到classes目录中--> <resources> <resource> <directory>src/main/java</directory><!--所在的目录--> <includes><!--包括目录下的.properties,.xml 文件都会扫描到--> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>false</filtering> </resource> </resources> <!--指定jdk的版本--> <plugins> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.1</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> </project>
5、新建domain包并定义实体类Student.java
package com.bjpowernode.domain; public class Student { //属性名和列名一样。 private Integer id; private String name; private String email; private Integer age; public Student() { } public Student(Integer id, String name, String email, Integer age) { this.id = id; this.name = name; this.email = email; this.age = 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 String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "Student{" + "id=" + id + ", name='" + name + '\'' + ", email='" + email + '\'' + ", age=" + age + '}'; } }
6、新建dao包并定义StudentDao.java接口
package com.bjpowernode.dao; import com.bjpowernode.domain.Student; import java.util.List; public interface StudentDao { int insertStudent(Student student); List<Student> selectStudents(); }
7、在dao包中定义映射文件StudentDao.xml
<?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.bjpowernode.dao.StudentDao"> <insert id="insertStudent"> insert into student values(#{id},#{name},#{email},#{age}) </insert> <select id="selectStudents" resultType="Student"> select id,name,email,age from student order by id desc </select> </mapper>
8、新建service包并定义Service.java接口和ServiceImpl.java实现类
package com.bjpowernode.service; import com.bjpowernode.domain.Student; import java.util.List; public interface StudentService { int addStudent(Student student); List<Student> queryStudents(); }
package com.bjpowernode.service.impl; import com.bjpowernode.dao.StudentDao; import com.bjpowernode.domain.Student; import com.bjpowernode.service.StudentService; import java.util.List; public class StudentServiceImpl implements StudentService { //引用类型 private StudentDao studentDao; //使用set注入,赋值 public void setStudentDao(StudentDao studentDao) { this.studentDao = studentDao; } @Override public int addStudent(Student student) { int nums = studentDao.insertStudent(student); return nums; } @Override public List<Student> queryStudents() { List<Student> students = studentDao.selectStudents(); return students; } }
9、main文件夹下新建resources包,并标记为Resources根并定义Mybatis.xml主配置文件
<?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> <!--settings:控制mybatis全局行为--> <settings> <!--设置mybatis输出日志--> <setting name="logImpl" value="STDOUT_LOGGING"/> </settings> <!--设置别名--> <typeAliases> <!--name:实体类所在的包名 表示com.bjpowernode.domain包中的列名就是别名 你可以使用student表示com.bjpowenrode.domain.Student --> <package name="com.bjpowernode.domain"/> </typeAliases> <!-- sql mapper(sql映射文件)的位置--> <mappers> <!-- name:是包名, 这个包中的所有mapper.xml一次都能加载 --> <package name="com.bjpowernode.dao"/> </mappers> </configuration>
10、resources包下新建applicationContext.xml 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:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd"> <!-- 把数据库的配置信息,写在一个独立的文件,编译修改数据库的配置内容 spring知道jdbc.properties文件的位置 --> <context:property-placeholder location="classpath:jdbc.properties" /> <!--声明数据源DataSource, 作用是连接数据库的--> <bean id="myDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!--set注入给DruidDataSource提供连接数据库信息 --> <!-- 使用属性配置文件中的数据,语法 ${key} --> <property name="url" value="${jdbc.url}" /><!--setUrl()--> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.passwd}" /> <property name="maxActive" value="${jdbc.max}" /> </bean> <!--声明的是mybatis中提供的SqlSessionFactoryBean类,这个类内部创建SqlSessionFactory的 SqlSessionFactory sqlSessionFactory = new .. --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!--set注入,把数据库连接池付给了dataSource属性--> <property name="dataSource" ref="myDataSource" /> <!--mybatis主配置文件的位置 configLocation属性是Resource类型,读取配置文件 它的赋值,使用value,指定文件的路径,使用classpath:表示文件的位置 --> <property name="configLocation" value="classpath:mybatis.xml" /> </bean> <!--创建dao对象,使用SqlSession的getMapper(StudentDao.class) MapperScannerConfigurer:在内部调用getMapper()生成每个dao接口的代理对象。 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!--指定SqlSessionFactory对象的id--> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> <!--指定包名, 包名是dao接口所在的包名。 MapperScannerConfigurer会扫描这个包中的所有接口,把每个接口都执行 一次getMapper()方法,得到每个接口的dao对象。 创建好的dao对象放入到spring的容器中的。 dao对象的默认名称是 接口名首字母小写 --> <property name="basePackage" value="com.bjpowernode.dao"/> </bean> <!--声明service--> <bean id="studentService" class="com.bjpowernode.service.impl.StudentServiceImpl"> <property name="studentDao" ref="studentDao" /> </bean> </beans>
10、新建jdbc.properties文件
jdbc.url=jdbc:mysql://localhost:3306/springdb jdbc.username=root jdbc.passwd=root jdbc.max=30
11、test/ java/com/bjpowernode下新建测试类MyTest.java
package com.bjpowernode; import com.bjpowernode.dao.StudentDao; import com.bjpowernode.domain.Student; import com.bjpowernode.service.StudentService; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.util.List; public class MyTest { @Test public void test01(){ String config="applicationContext.xml"; ApplicationContext ctx = new ClassPathXmlApplicationContext(config); String names[] = ctx.getBeanDefinitionNames(); for(String na:names){ System.out.println("容器中对象名称:"+na+"|"+ctx.getBean(na)); } } @Test public void testDaoInsert(){ String config="applicationContext.xml"; ApplicationContext ctx = new ClassPathXmlApplicationContext(config); //获取spring容器中的dao对象 StudentDao dao = (StudentDao) ctx.getBean("studentDao"); Student student = new Student(); student.setId(1013); student.setName("周锋"); student.setEmail("zhoufeng@qq.com"); student.setAge(20); int nums = dao.insertStudent(student); System.out.println("nums="+nums); } @Test public void testServiceInsert(){ String config="applicationContext.xml"; ApplicationContext ctx = new ClassPathXmlApplicationContext(config); //获取spring容器中的dao对象 StudentService service = (StudentService) ctx.getBean("studentService"); Student student = new Student(); student.setId(1015); student.setName("李胜利"); student.setEmail("zhoufeng@qq.com"); student.setAge(26); int nums = service.addStudent(student); //spring和mybatis整合在一起使用,事务是自动提交的。 无需执行SqlSession.commit(); System.out.println("nums="+nums); } @Test public void testServiceSelect(){ String config="applicationContext.xml"; ApplicationContext ctx = new ClassPathXmlApplicationContext(config); //获取spring容器中的dao对象 StudentService service = (StudentService) ctx.getBean("studentService"); List<Student> students = service.queryStudents(); for (Student stu:students){ System.out.println(stu); } } }
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