springboot整合mybatis使用Mysql实现主键UUID

实现

基础项目的pom.xml部分代码如下

<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>

具体的mybatis配置如下

@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;
    }

实体如下

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;

下面这一行代码是为了解决spring MVC在入参是Date类型时或出现异常的问题

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

测试

配置文件配置输出mybatis的sql日志

logging.level.com.你的dao或mapper包=debug

执行对应插入操作观察控制台

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

可以看到,首先执行了查询UUID的操作,然后将执行结果作为插入的主键执行插入操作.