spring boot整合mybatis利用Mysql实现主键UUID的方法

 <properties>
  <java.version>1.8</java.version>
 </properties>
 <!-- Inherit defaults from Spring Boot -->
 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>1.5.9.RELEASE</version>
 </parent>
 <dependencies>
  <!--Spring Boot依赖-->
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-jdbc</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-test</artifactId>
   <scope>test</scope>
  </dependency>
  <!--常用库依赖-->
  <dependency>
   <groupId>commons-codec</groupId>
   <artifactId>commons-codec</artifactId>
  </dependency>
  <dependency>
   <groupId>org.apache.commons</groupId>
   <artifactId>commons-lang3</artifactId>
   <version>3.6</version>
  </dependency>
  <dependency>
   <groupId>com.google.guava</groupId>
   <artifactId>guava</artifactId>
   <version>23.0</version>
  </dependency>
  <!--MySQL JDBC驱动-->
  <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <scope>runtime</scope>
  </dependency>
  <!--MyBatis 及 插件依赖-->
  <dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis-spring</artifactId>
   <version>1.3.1</version>
  </dependency>
  <dependency>
   <groupId>org.mybatis</groupId>
   <artifactId>mybatis</artifactId>
   <version>3.4.5</version>
  </dependency>
  <dependency>
   <groupId>tk.mybatis</groupId>
   <artifactId>mapper</artifactId>
   <version>3.4.2</version>
  </dependency>
  <dependency>
   <groupId>com.github.pagehelper</groupId>
   <artifactId>pagehelper</artifactId>
   <version>4.2.1</version>
  </dependency>
  <!--阿里 FastJson依赖-->
  <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>fastjson</artifactId>
   <version>1.2.44</version>
  </dependency>
  <!--阿里 Druid Spring Boot Starter依赖-->
  <dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>druid-spring-boot-starter</artifactId>
   <version>1.1.6</version>
  </dependency>
 </dependencies>
</project>

@Bean
 public MapperScannerConfigurer mapperScannerConfigurer() {
  MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
  mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactoryBean");
  mapperScannerConfigurer.setBasePackage(MAPPER_PACKAGE);
  //配置通用Mapper，详情请查阅官方文档
  Properties properties = new Properties();
  properties.setProperty("mappers", MAPPER_INTERFACE_REFERENCE);
  properties.setProperty("notEmpty", "true");//insert、update是否判断字符串类型!='' 即 test="str != null"表达式内是否追加 and str != ''
  properties.setProperty("IDENTITY", "SELECT UUID()");//使用UUID作為主鍵
  properties.setProperty("ORDER","BEFORE");//将查询主键作为前置操作
  mapperScannerConfigurer.setProperties(properties);
  return mapperScannerConfigurer;
 }

public class User {
 @Id
 @Column(name = "ID")
 @GeneratedValue(strategy = GenerationType.IDENTITY)
 private String id;
 @Column(name = "CREATED_BY")
 private String createdBy;
 @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
 @Column(name = "CREATED_DATE")
 private Date createdDate;
 @Column(name = "LAST_MODIFIED_BY")
 private String lastModifiedBy;
 @DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
 @Column(name = "LAST_MODIFIED_DATE")
 private Date lastModifiedDate;

@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")

logging.level.com.你的dao或mapper包=debug

2018-03-06 17:59:22.612 DEBUG 6208 --- [nio-8686-exec-1] XXXXX: ==> Executing: SELECT UUID() 
2018-03-06 17:59:22.629 DEBUG 6208 --- [nio-8686-exec-1] XXXXX: <==  Total: 1
2018-03-06 17:59:22.651 DEBUG 6208 --- [nio-8686-exec-1] XXXXX: ==> Preparing: INSERT INTO user ( ID,USER_NAME,NICK_NAME,PWD_SALT,PWD_LOGIN,CREATED_BY,CREATED_DATE,LAST_MODIFIED_BY,LAST_MODIFIED_DATE,ACCOUNT_TYPE,ACCOUNT_LOCKED,ONLINE_STATUS,GROUP_ID,GROUP_NAME ) VALUES( ?,?,?,?,? ) 
2018-03-06 17:59:22.665 DEBUG 6208 --- [nio-8686-exec-1] XXXXX: ==> Parameters: 0b97ad1b-2125-11e8-9b42-704d7b7036d3(String), 2(String), 2018-01-01 01:07:05.0(Timestamp), 2(String), 2018-01-01 01:07:05.0(Timestamp)
2018-03-06 17:59:22.670 DEBUG 6208 --- [nio-8686-exec-1] XXXXX: <== Updates: 1