Integrated approach
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New maven project
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Introduce dependency packages
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Configuration resource file
Case practice
New maven project
New maven project spring_mybatis
The directory structure is as follows:
Home directory package:
Com.xxx.dao 、
com.xxx.mapper、
com.xxx.service、
com.xxx.service.impl
Test package: spring_mybatis
Introduce dependency packages
Open pom.xml and start adding dependency packages
<?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.xxx</groupId>
<artifactId>test-xxxms</artifactId>
<version>1.0-SNAPSHOT</version>
<name>test-xxxms</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>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!-- spring 核心jar -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.2.RELEASE</version>
</dependency>
<!-- spring 测试jar -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>4.3.2.RELEASE</version>
</dependency>
<!-- spring jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.3.2.RELEASE</version>
</dependency>
<!-- spring事物 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.3.2.RELEASE</version>
</dependency>
<!-- c3p0 连接池 -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!-- mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.1</version>
</dependency>
<!-- 添加mybatis与Spring整合的核心包 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<!-- mysql 驱动包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.39</version>
</dependency>
<!-- 日志打印相关的jar -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.2</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.2</version>
</dependency>
</dependencies>
<build>
<finalName>tpl-web</finalName>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.xml</include>
<include>**/*.properties</include>
</includes>
</resource>
</resources>
</build>
</project>
Configuration resource file
a) Spring file spring.xml
b) Mybatis file mybatis.xml
c) Database connection properties file db.properties
d) Log output file log4j.properties
spring.xml file configuration
<?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"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
<context:component-scan base-package="com.xxx"/>
<context:property-placeholder location="db.properties"/>
<tx:annotation-driven transaction-manager="txManager"/>
<!-- 配置c3p0 数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<bean id="txManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 整合 框架（Spring与Mybatis） -->
<!-- 配置 sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 数据源 -->
<property name="dataSource" ref="dataSource"></property>
<!-- 框架的配置文件 -->
<property name="configLocation" value="classpath:mybatis.xml" />
<!-- 映射文件 -->
<property name="mapperLocations" value="classpath:com/xxx/dao/mapper/*.xml" />
</bean>
<!-- 配置扫描器 -->
<bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 扫描com.xxx.dao这个包以及它的子包下的所有映射接口类 -->
<property name="basePackage" value="com.xxx.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
</bean>
</beans>
mybatis.xml file configuration
<?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>
<!--别名的配置 每个人必须会 -->
<typeAliases>
<package name="com.xxx.model"/>
</typeAliases>
</configuration>
db.properties file configuration (for other data source property configuration, see c3p0 configuration explanation, here default property configuration is used)
Create a database mybatis ( note that the database, user name and password are subject to your own local database )
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=
utf8
jdbc.username=root
jdbc.password=
log4j.properties
Convenient for console log output
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
Expand
Start writing helloworld
User entity class definition
public class User {
private int id;
private String userName;
private String userPwd;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getUserPwd() {
return userPwd;
}
public void setUserPwd(String userPwd) {
this.userPwd = userPwd;
}
@Override
public String toString() {
return "User [id=" + id + ", userName=" + userName + ", userPwd="
\+ userPwd + "]";
}
}
UseDao interface and mapping file definition
UserDao interface
public interface UserDao {
public User queryUserById(int id);
}
UserMapper.xml ( Note: At this time, the mapping file namespace definition must comply with the rules: interface package name . interface class
Name , otherwise the cards are not played according to the rules, the test will report an error, and then you will be trapped! ! ! )
<?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.xxx.dao.UserDao">
<select id="queryUserById" parameterType="int" resultType="user">
select id,userName,userPwd from user where id=#{id}
</select>
</mapper>
UserService interface class and implementation class definition
public interface UserService {
public User queryUserById();
}
UserServiceImpl implementation class ( inject our UserDao interface directly at this time , and then call directly
The method, the matter is here, only one step away from success! )
@Service
public class UserServiceImpl implements UserService{
@Resource
private UserDao userDao;
public User queryUserById(){
return userDao.queryUserById(7);
}
}
junit test
Because of the integration with spring framework, we use spring framework to test spring Test
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = {
"classpath:spring.xml"} )
public class TestSpringMybatis {
@Autowired
private UserService userService;
@Test
public void testQueryUserById() {
System.out.println(userService.queryUserById(1));
}
}
Result output
