手搭手Mybatis-Plus多数据源异构数据迁移案例
【摘要】 手搭手Mybatis-Plus多数据源异构数据迁移案例(oracle迁移至dm8,mysql迁移至dm8)
环境介绍
技术栈 |
springboot+mybatis-plus+druid+baomidou+mysql+oracle+dm |
软件 |
版本 |
8 |
|
IDEA |
IntelliJ IDEA 2022.2.1 |
JDK |
1.8 |
Spring Boot |
2.7.13 |
mybatis |
2.3.1 |
pom.xml所需依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.5.3.2</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>dynamic-datasource-spring-boot-starter</artifactId>
<version>3.5.0</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.14</version>
</dependency>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.15</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.dameng</groupId>
<artifactId>Dm8JdbcDriver18</artifactId>
<version>8.1.1.49</version>
</dependency>
<dependency>
<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc8</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
MybatisX逆向工程
逆向工程:通过数据库表接口,逆向生成java工程结构
实体类、mapper接口、mapper映射文件、Service接口、service实现类
application.yml
spring:
datasource:
dynamic:
primary: #设置默认的数据源或者数据源组,默认值即为master
strict: false #严格匹配数据源,默认false. true未匹配到指定数据源时抛异常,false使用默认数据源
datasource:
mysql1:
username: root
password: PWD
url: jdbc:mysql://IP:3306/mysql?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8
driver-class-name: com.mysql.cj.jdbc.Driver
# driver-class-name: com.mysql.jdbc.Driver
mysql2:
url: jdbc:mysql://IP:3306/sys?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8
username: root
password: PWD
driver-class-name: com.mysql.cj.jdbc.Driver
oracle:
username: system
password: PWD
url: jdbc:oracle:thin:@IP:1521:orcl
driver-class-name: oracle.jdbc.driver.OracleDriver
# driver-class-name: com.mysql.jdbc.Driver
dm:
url: jdbc:dm://127.0.0.1:5236/demo?
username: SYSDBA
password: SYSDBA
driver-class-name: dm.jdbc.driver.DmDriver
# driver-class-name: com.mysql.jdbc.Driver
server:
port: 8089
mybatis-plus:
configuration:
#输出日志
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
#配置映射规则
map-underscore-to-camel-case: true #表示支持下划线到驼蜂的映射
#隐藏mybatis图标
global-config:
banner: false
db-config:
logic-delete-field: status
logic-not-delete-value: 1
logic-delete-value: 0
spy.properties
#3.2.1以上使用
modulelist=com.baomidou.mybatisplus.extension.p6spy.MybatisPlusLogFactory,com.p6spy.engine.outage.P6OutageFactory
#3.2.1以下使用或者不配置
#modulelist=com.p6spy.engine.logging.P6LogFactory,com.p6spy.engine.outage.P6OutageFactory
# 自定义日志打印
logMessageFormat=com.baomidou.mybatisplus.extension.p6spy.P6SpyLogger
#日志输出到控制台
appender=com.baomidou.mybatisplus.extension.p6spy.StdoutLogger
# 使用日志系统记录 sql
#appender=com.p6spy.engine.spy.appender.Slf4JLogger
# 设置 p6spy driver 代理
deregisterdrivers=true
# 取消JDBC URL前缀
useprefix=true
# 配置记录 Log 例外,可去掉的结果集有error,info,batch,debug,statement,commit,rollback,result,resultset.
excludecategories=info,debug,result,commit,resultset
# 日期格式
dateformat=yyyy-MM-dd HH:mm:ss
# 实际驱动可多个
#driverlist=org.h2.Driver
# 是否开启慢SQL记录
outagedetection=true
# 慢SQL记录标准 2 秒
outagedetectioninterval=2
MybatisX逆向工程只是一个便携的工具,自定义接口和实现类还是要自己写
mapper(dao层)
@Mapper
public interface UserMapper extends BaseMapper<User> {
}
@Mapper
public interface TUserMapper extends BaseMapper<TUser> {
}
@Mapper
public interface TestMapper extends BaseMapper<Test> {
List<Test> selectTestAll();
}
@Mapper
public interface DmuserMapper extends BaseMapper<Dmuser> {
List<Dmuser> selectDmUserAll();
Integer addDmUser(Dmuser dmuser);
}
service接口层
public interface UserService extends IService<User> {
}
public interface TUserService extends IService<TUser> {
}
public interface TestService extends IService<Test> {
List<Test> selectTestAll();
}
public interface DmuserService extends IService<Dmuser> {
List<Dmuser> selectDmUserAll();
Integer addDmUser(Dmuser dmuser);
}
mapper映射文件
<mapper namespace="com.example.mapper.UserMapper">
<resultMap id="BaseResultMap" type="com.example.domain.User">
<id property="id" column="id" jdbcType="VARCHAR"/>
<result property="name" column="name" jdbcType="VARCHAR"/>
<result property="age" column="age" jdbcType="INTEGER"/>
<result property="email" column="email" jdbcType="VARCHAR"/>
<result property="status" column="status" jdbcType="INTEGER"/>
<result property="gender" column="gender" jdbcType="INTEGER"/>
<result property="contact" column="contact" jdbcType="VARCHAR"/>
<result property="createTime" column="create_time" jdbcType="TIMESTAMP"/>
<result property="updateTime" column="update_time" jdbcType="TIMESTAMP"/>
</resultMap>
<sql id="Base_Column_List">
id,name,age,
email,status,gender,
contact,create_time,update_time
</sql>
</mapper>
<mapper namespace="com.example.mapper.TUserMapper">
<resultMap id="BaseResultMap" type="com.example.domain.TUser">
<id property="id" column="id" jdbcType="BIGINT"/>
<result property="name" column="name" jdbcType="VARCHAR"/>
<result property="age" column="age" jdbcType="INTEGER"/>
<result property="email" column="email" jdbcType="VARCHAR"/>
</resultMap>
<sql id="Base_Column_List">
id,name,age,
email
</sql>
</mapper>
<mapper namespace="com.example.mapper.TestMapper">
<resultMap id="BaseResultMap" type="com.example.domain.Test">
<id property="id" column="id" jdbcType="DECIMAL"/>
<result property="name" column="name" jdbcType="VARCHAR"/>
</resultMap>
<sql id="Base_Column_List">
id,name
</sql>
<select id="selectTestAll" resultType="com.example.domain.Test">select * from "test"</select>
</mapper>
<mapper namespace="com.example.mapper.DmuserMapper">
<resultMap id="BaseResultMap" type="com.example.domain.Dmuser">
<id property="id" column="id" jdbcType="INTEGER"/>
<result property="name" column="name" jdbcType="CHAR"/>
<result property="address" column="address" jdbcType="CHAR"/>
</resultMap>
<sql id="Base_Column_List">
id,name,address
</sql>
<select id="selectDmUserAll" resultType="com.example.domain.Dmuser">select "id","name","address"from "SYSDBA"."DMUser";</select>
<insert id="addDmUser">
insert into "SYSDBA"."DMUser"("id", "name", "address") VALUES(#{id},#{name},#{address});
</insert>
</mapper>
serviceimpl类
@Service
@DS("mysql2")
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
implements UserService{
}
@Service
@DS("mysql1")
public class TUserServiceImpl extends ServiceImpl<TUserMapper, TUser>
implements TUserService{
}
@Service
@DS("oracle")
public class TestServiceImpl extends ServiceImpl<TestMapper, Test>
implements TestService{
@Autowired
private TestMapper testMapper;
@Override
public List<Test> selectTestAll() {
return testMapper.selectTestAll();
}
}
@Service
@DS("dm")
public class DmuserServiceImpl extends ServiceImpl<DmuserMapper, Dmuser>
implements DmuserService{
@Autowired
private DmuserMapper dmuserMapper;
@Override
public List<Dmuser> selectDmUserAll() {
return dmuserMapper.selectDmUserAll();
}
@Override
public Integer addDmUser(Dmuser dmuser) {
return dmuserMapper.addDmUser(dmuser);
}
}
测试类
@SpringBootTest
class DatasourcesApplicationTests {
@Autowired
private TUserService tUserService;
@Autowired
private UserService userService;
@Autowired
private TestService testService;
@Autowired
private DmuserService dmuserService;
@Test
void sys(){
userService.list();
}
@Test
void oracleDemo(){
testService.selectTestAll();
}
@Test
void dmDemo(){
dmuserService.selectDmUserAll();
}
@Test
void oracleToDMTest(){
List<com.example.domain.Test> oracles =testService.selectTestAll();
for (com.example.domain.Test oracle : oracles) {
Dmuser dmuser =new Dmuser();
dmuser.setId(Math.toIntExact(oracle.getId()));
dmuser.setName(oracle.getName());
dmuser.setAddress("null");
dmuserService.addDmUser(dmuser);
System.out.println(""+oracle);
}
}
@Test
void mysqlToDMTest(){
List<TUser> mysqls =tUserService.list();
for (TUser mysql : mysqls) {
Dmuser dmuser =new Dmuser();
dmuser.setId(Math.toIntExact(mysql.getId()));
dmuser.setName(mysql.getName());
dmuser.setAddress(mysql.getEmail());
dmuserService.addDmUser(dmuser);
System.out.println(""+mysql);
}
}
}
Mybatis-Plus介绍
为简化开发而生
MyBatis-Plus (opens new window)(简称 MP)是一个 MyBatis (opens new window) 的增强工具,在 MyBatis 的基础上只做增强不做改变,为简化开发、提高效率而生。
特性
- 无侵入:只做增强不做改变,引入它不会对现有工程产生影响,如丝般顺滑
- 损耗小:启动即会自动注入基本 CURD,性能基本无损耗,直接面向对象操作
- 强大的 CRUD 操作:内置通用 Mapper、通用 Service,仅仅通过少量配置即可实现单表大部分 CRUD 操作,更有强大的条件构造器,满足各类使用需求
- 支持 Lambda 形式调用:通过 Lambda 表达式,方便的编写各类查询条件,无需再担心字段写错
- 支持主键自动生成:支持多达 4 种主键策略(内含分布式唯一 ID 生成器 - Sequence),可自由配置,完美解决主键问题
- 支持 ActiveRecord 模式:支持 ActiveRecord 形式调用,实体类只需继承 Model 类即可进行强大的 CRUD 操作
- 支持自定义全局通用操作:支持全局通用方法注入( Write once, use anywhere )
- 内置代码生成器:采用代码或者 Maven 插件可快速生成 Mapper 、 Model 、 Service 、 Controller 层代码,支持模板引擎,更有超多自定义配置等您来使用
- 内置分页插件:基于 MyBatis 物理分页,开发者无需关心具体操作,配置好插件之后,写分页等同于普通 List 查询
- 分页插件支持多种数据库:支持 MySQL、MariaDB、Oracle、DB2、H2、HSQL、SQLite、Postgre、SQLServer 等多种数据库
- 内置性能分析插件:可输出 SQL 语句以及其执行时间,建议开发测试时启用该功能,能快速揪出慢查询
- 内置全局拦截插件:提供全表 delete 、 update 操作智能分析阻断,也可自定义拦截规则,预防误操作
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