环境介绍
技术栈 | springboot+mybatis-plus+druid+baomidou+mysql+oracle+dm |
软件 | 版本 |
mysql | 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masterstrict: 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: rootpassword: PWDurl: jdbc:mysql://IP:3306/mysql?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8driver-class-name: com.mysql.cj.jdbc.Driver# driver-class-name: com.mysql.jdbc.Drivermysql2:url: jdbc:mysql://IP:3306/sys?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8username: rootpassword: PWDdriver-class-name: com.mysql.cj.jdbc.Driveroracle:username: systempassword: PWDurl: jdbc:oracle:thin:@IP:1521:orcldriver-class-name: oracle.jdbc.driver.OracleDriver# driver-class-name: com.mysql.jdbc.Driverdm:url: jdbc:dm://127.0.0.1:5236/demo?username: SYSDBApassword: SYSDBAdriver-class-name: dm.jdbc.driver.DmDriver# driver-class-name: com.mysql.jdbc.Driverserver:port: 8089mybatis-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: falsedb-config:logic-delete-field: statuslogic-not-delete-value: 1logic-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{@Autowiredprivate TestMapper testMapper;@Overridepublic List<Test> selectTestAll() {return testMapper.selectTestAll();}
}
@Service
@DS("dm")
public class DmuserServiceImpl extends ServiceImpl<DmuserMapper, Dmuser>implements DmuserService{@Autowiredprivate DmuserMapper dmuserMapper;@Overridepublic List<Dmuser> selectDmUserAll() {return dmuserMapper.selectDmUserAll();}@Overridepublic Integer addDmUser(Dmuser dmuser) {return dmuserMapper.addDmUser(dmuser);}
}
测试类
@SpringBootTest
class DatasourcesApplicationTests {@Autowiredprivate TUserService tUserService;@Autowiredprivate UserService userService;@Autowiredprivate TestService testService;@Autowiredprivate DmuserService dmuserService;@Testvoid sys(){userService.list();}@Testvoid oracleDemo(){testService.selectTestAll();}@Testvoid dmDemo(){dmuserService.selectDmUserAll();}@Testvoid 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);}}@Testvoid 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
https://baomidou.com/
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