myBatis 基于javaBean配置

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MyBatis的持久化解决方案是将用户从原始的JDBC访问中解放出来,用户只需要定义需要操作的SQL语句,

无须关注底层的JDBC操作,就可以以面向对象的方式来进行持久化层操作.底层数据库连接的获取,数据访问的实现,事务控制等都无须用户关心,

从而将应用层从底层的JDBC/JTA API抽取出来.通过配置文件管理JDBC连接,让MyBatis解决持久化的实现.在MyBatis中的常见对象有SqlSessionFactory和SqlSession.

依赖

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency> <dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
<version>5.1.27</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies> <build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

use类

public class User {
private Long id;
private String username;
private String address; @Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
", address='" + address + '\'' +
'}';
} public Long getId() {
return id;
} public void setId(Long id) {
this.id = id;
} public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username;
} public String getAddress() {
return address;
} public void setAddress(String address) {
this.address = address;
}
}

DataSourceConfig 数据源配置类

import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;@Configuration
public class DataSourceConfig {
@Bean
@ConfigurationProperties(prefix = "spring.datasource.one")
DataSource dsOne() {
return DruidDataSourceBuilder.create().build();
} @Bean
@ConfigurationProperties(prefix = "spring.datasource.two")
DataSource dsTwo() {
return DruidDataSourceBuilder.create().build();
}
}

MyBatisConfigOne

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;@Configuration
@MapperScan(basePackages = "org.javaboy.mybatis.mapper1", sqlSessionFactoryRef = "sqlSessionFactory1", sqlSessionTemplateRef = "sqlSessionTemplate1")
public class MyBatisConfigOne {
@Autowired
@Qualifier("dsOne")
DataSource dsOne;
@Bean
SqlSessionFactory sqlSessionFactory1() {
SqlSessionFactory sessionFactory = null;
try {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dsOne);
sessionFactory = bean.getObject();
} catch (Exception e) {
e.printStackTrace();
}
return sessionFactory;
}
@Bean
SqlSessionTemplate sqlSessionTemplate1() {
return new SqlSessionTemplate(sqlSessionFactory1());
}
}

MyBatisConfigTwo

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;@Configuration
@MapperScan(basePackages = "org.javaboy.mybatis.mapper2", sqlSessionFactoryRef = "sqlSessionFactory2", sqlSessionTemplateRef = "sqlSessionTemplate2")
public class MyBatisConfigTwo {
@Autowired
@Qualifier("dsTwo")
DataSource dsOne;
@Bean
SqlSessionFactory sqlSessionFactory2() {
SqlSessionFactory sessionFactory = null;
try {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dsOne);
sessionFactory = bean.getObject();
} catch (Exception e) {
e.printStackTrace();
}
return sessionFactory;
}
@Bean
SqlSessionTemplate sqlSessionTemplate2() {
return new SqlSessionTemplate(sqlSessionFactory2());
}
}

UserMapper1

import org.javaboy.mybatis.bean.User;import java.util.List;//@Mapper
public interface UserMapper1 {
// @Select("select * from t_user")
List<User> getAllUser();
}

UserMapper1.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="org.javaboy.mybatis.mapper1.UserMapper1">
<select id="getAllUser" resultType="org.javaboy.mybatis.bean.User">
select * from t_user;
</select>
</mapper>

UserMapper2

import org.javaboy.mybatis.bean.User;import java.util.List;//@Mapper
public interface UserMapper2{
// @Select("select * from t_user")
List<User> getAllUser();
}

UserMapper2.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="org.javaboy.mybatis.mapper2.UserMapper2">
<select id="getAllUser" resultType="org.javaboy.mybatis.bean.User">
select * from t_user;
</select>
</mapper>

application.properties 配置文件

spring.datasource.one.url=jdbc:mysql:///test01
spring.datasource.one.username=root
spring.datasource.one.password=root
spring.datasource.one.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.one.driver-class-name=com.mysql.jdbc.Driverspring.datasource.two.url=jdbc:mysql:///test02
spring.datasource.two.username=root
spring.datasource.two.password=root
spring.datasource.two.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.two.driver-class-name=com.mysql.jdbc.Driver