springboot+mybatis通过实体类自动生成数据库表的方法

前言

本章介绍使用mybatis结合mysql数据库自动根据实体类生成相关的数据库表。

首先引入相关的pom包我这里使用的是springboot2.1.8.RELEASE的版本

<dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.0</version></dependency><dependency><groupId>com.gitee.sunchenbin.mybatis.actable</groupId><artifactId>mybatis-enhance-actable</artifactId><version>1.0.1</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.1.10</version></dependency><!--以下两个类需要加入，否则报错无法注入--><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.4</version></dependency><dependency><groupId>net.sf.json-lib</groupId><artifactId>json-lib</artifactId><version>2.4</version><classifier>jdk15</classifier><exclusions><exclusion><artifactId>commons-logging</artifactId><groupId>commons-logging</groupId></exclusion></exclusions></dependency>

添加数据库配置文件application.propertiesapplication.properties这里是单独配置mybatis自动建表的相关信息。

mybatis.table.auto=updatemybatis.model.pack=com.xxx.xxx.entity//实体类的路径mybatis.database.type=mysql

mybatis.table.auto=

create：每次加载hibernate会自动创建表，以后启动会覆盖之前的表，所以这个值基本不用，严重会导致的数据的丢失。

create-drop ：每次加载hibernate时根据model类生成表，但是sessionFactory一关闭，表就自动删除，下一次启动会重新创建。

update：加载hibernate时根据实体类model创建数据库表，这是表名的依据是@Entity注解的值或者@Table注解的值，sessionFactory关闭表不会删除，且下一次启动会根据实体。

model：更新结构或者有新的实体类会创建新的表。

validate：启动时验证表的结构，不会创建表 none：启动时不做任何操作

mybatis.model.pack=com.xxx.xxx.entity//你实体类的路径

个人项目配置文件，非统一，根据项目需求配置

进行生成数据库表相关配置

TestConfig配置文件

import com.alibaba.druid.pool.DruidDataSource;import org.mybatis.spring.SqlSessionFactoryBean;import org.springframework.beans.factory.annotation.Value;import org.springframework.beans.factory.config.PropertiesFactoryBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.core.io.support.PathMatchingResourcePatternResolver;import org.springframework.jdbc.datasource.DataSourceTransactionManager;@Configuration@ComponentScan(basePackages = {'com.gitee.sunchenbin.mybatis.actable.manager.*'})//固定的包public class TestConfig {//连接数据库配置文件的地址，具体查阅配置文件的结构 @Value('${spring.datasource.druid.driver-class-name}') private String driver;//连接数据库配置文件的地址，具体查阅配置文件的结构 @Value('${spring.datasource.druid.url}') private String url;//连接数据库配置文件的地址，具体查阅配置文件的结构 @Value('${spring.datasource.druid.username}') private String username;//连接数据库配置文件的地址，具体查阅配置文件的结构 @Value('${spring.datasource.druid.password}') private String password; @Bean public PropertiesFactoryBean configProperties() throws Exception{ PropertiesFactoryBean propertiesFactoryBean = new PropertiesFactoryBean(); PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(); propertiesFactoryBean.setLocations(resolver.getResources('classpath*:application.properties'));//classpath*:application.properties是mybatis的生成表配置文件 return propertiesFactoryBean; } @Bean public DruidDataSource dataSource() { DruidDataSource dataSource = new DruidDataSource(); dataSource.setDriverClassName(driver); dataSource.setUrl(url); dataSource.setUsername(username); dataSource.setPassword(password); dataSource.setMaxActive(30); dataSource.setInitialSize(10); dataSource.setValidationQuery('SELECT 1'); dataSource.setTestOnBorrow(true); return dataSource; } @Bean public DataSourceTransactionManager dataSourceTransactionManager() { DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager(); dataSourceTransactionManager.setDataSource(dataSource()); return dataSourceTransactionManager; } @Bean public SqlSessionFactoryBean sqlSessionFactory() throws Exception{ SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); sqlSessionFactoryBean.setDataSource(dataSource()); PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(); sqlSessionFactoryBean.setMapperLocations(resolver.getResources('classpath*:com/gitee/sunchenbin/mybatis/actable/mapping/*/*.xml')); sqlSessionFactoryBean.setTypeAliasesPackage('com.xxx.xxx.entity.*'); //上述classpath*:com/gitee/sunchenbin/mybatis/actable/mapping/*/*.xml固定的包路径 //com.xxx.xxx.entity.*替换成你的实体类地址 return sqlSessionFactoryBean; }}

MyBatisMapperScannerConfig配置文件

import org.mybatis.spring.mapper.MapperScannerConfigurer;import org.springframework.boot.autoconfigure.AutoConfigureAfter;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configuration@AutoConfigureAfter(TestConfig.class)//上面第一点配置文件类public class MyBatisMapperScannerConfig { @Bean public MapperScannerConfigurer mapperScannerConfigurer() throws Exception{ MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer(); mapperScannerConfigurer.setBasePackage('com.xxx.xxx.mapper.*;com.gitee.sunchenbin.mybatis.actable.dao.*'); mapperScannerConfigurer.setSqlSessionFactoryBeanName('sqlSessionFactory'); //com.xxx.xxx.mapper.*替换成你的mapper地址 //com.gitee.sunchenbin.mybatis.actable.dao.*固定的包 return mapperScannerConfigurer; }}

新建实体进行测试

注：@Table(name = “”)及@Column（name = “id”）注解使用，实体类继承BaseModel。

import com.gitee.sunchenbin.mybatis.actable.annotation.Column;import com.gitee.sunchenbin.mybatis.actable.annotation.Table;import com.gitee.sunchenbin.mybatis.actable.command.BaseModel;import com.gitee.sunchenbin.mybatis.actable.constants.MySqlTypeConstant;@Table(name = 'em_t')//新建表数据库表名public class EmpAttr extends BaseModel{ private static final long serialVersionUID = 5199244153134426433L; @Column(name = 'id',type = MySqlTypeConstant.INT,length = 11,isKey = true,isAutoIncrement = true) private String id; @Column(name='ename',type= MySqlTypeConstant.VARCHAR) private String ename; @Column(name='sal',type= MySqlTypeConstant.VARCHAR) private String sal; @Column(name='job',type= MySqlTypeConstant.VARCHAR) private String job; //...省略get，set方法}

运行项目

会控制台会显示说新建表完成2020-07-08 11:02:13.895 INFO 48536 — [ main] s.m.a.m.s.SysMysqlCreateTableManagerImpl : 开始创建表：em_t2020-07-08 11:02:13.983 INFO 48536 — [ main] s.m.a.m.s.SysMysqlCreateTableManagerImpl : 完成创建表：em_t

. ____ _ __ _ _ / / ___’_ __ _ _(_)_ __ __ _ ( ( )___ | ’_ | ’_| | ’_ / _` | / ___)| |_)| | | | | || (_| | ) ) ) ) ’ |____| .__|_| |_|_| |___, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v2.1.8.RELEASE)2020-07-08 11:02:11.264 INFO 48536 --- [ main] com.qiaoyuantest.www.WwwApplication : Starting WwwApplication on DD-HP with PID 48536 (E:mysoftkaifasoftkaifa_codeideamyiperf_springboottargetclasses started by DD in E:mysoftkaifasoftkaifa_codeideamyiperf_springboot)2020-07-08 11:02:11.266 INFO 48536 --- [ main] com.qiaoyuantest.www.WwwApplication : The following profiles are active: prod2020-07-08 11:02:12.207 INFO 48536 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Multiple Spring Data modules found, entering strict repository configuration mode!2020-07-08 11:02:12.208 INFO 48536 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.2020-07-08 11:02:12.228 INFO 48536 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 10ms. Found 0 repository interfaces.2020-07-08 11:02:12.301 INFO 48536 --- [ main] o.s.c.a.ConfigurationClassPostProcessor : Cannot enhance @Configuration bean definition ’myBatisMapperScannerConfig’ since its singleton instance has been created too early. The typical cause is a non-static @Bean method with a BeanDefinitionRegistryPostProcessor return type: Consider declaring such methods as ’static’.2020-07-08 11:02:12.522 INFO 48536 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean ’org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration’ of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$54b62352] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)2020-07-08 11:02:12.613 INFO 48536 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean ’redisConfiguration’ of type [com.qiaoyuantest.www.config.RedisConfiguration$$EnhancerBySpringCGLIB$$9518fca7] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)2020-07-08 11:02:12.651 ERROR 48536 --- [ main] o.a.catalina.core.AprLifecycleListener : An incompatible version [1.2.7] of the APR based Apache Tomcat Native library is installed, while Tomcat requires version [1.2.14]2020-07-08 11:02:12.808 ERROR 48536 --- [ main] o.a.catalina.core.AprLifecycleListener : An incompatible version [1.2.7] of the APR based Apache Tomcat Native library is installed, while Tomcat requires version [1.2.14]2020-07-08 11:02:12.927 INFO 48536 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8910 (http)2020-07-08 11:02:12.937 ERROR 48536 --- [ main] o.a.catalina.core.AprLifecycleListener : An incompatible version [1.2.7] of the APR based Apache Tomcat Native library is installed, while Tomcat requires version [1.2.14]2020-07-08 11:02:12.937 INFO 48536 --- [ main] o.a.coyote.http11.Http11NioProtocol : Initializing ProtocolHandler ['http-nio-8910']2020-07-08 11:02:12.944 INFO 48536 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]2020-07-08 11:02:12.944 INFO 48536 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.24]2020-07-08 11:02:13.035 INFO 48536 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext2020-07-08 11:02:13.036 INFO 48536 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1732 ms2020-07-08 11:02:13.623 INFO 48536 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService ’applicationTaskExecutor’2020-07-08 11:02:13.676 INFO 48536 --- [ main] c.g.s.m.a.m.handler.StartUpHandlerImpl : databaseType=mysql，开始执行mysql的处理方法Loading class `com.mysql.jdbc.Driver’. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver’. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.2020-07-08 11:02:13.829 INFO 48536 --- [ main] com.alibaba.druid.pool.DruidDataSource : {dataSource-1} initedfile类型的扫描2020-07-08 11:02:13.895 INFO 48536 --- [ main] s.m.a.m.s.SysMysqlCreateTableManagerImpl : 开始创建表：em_t2020-07-08 11:02:13.983 INFO 48536 --- [ main] s.m.a.m.s.SysMysqlCreateTableManagerImpl : 完成创建表：em_t2020-07-08 11:02:14.002 INFO 48536 --- [ main] c.q.www.config.RedisConfiguration : 自定义RedisCacheManager加载完成2020-07-08 11:02:14.826 INFO 48536 --- [ main] o.a.coyote.http11.Http11NioProtocol : Starting ProtocolHandler ['http-nio-8910']2020-07-08 11:02:14.849 INFO 48536 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8910 (http) with context path ’’2020-07-08 11:02:14.851 INFO 48536 --- [ main] com.qiaoyuantest.www.WwwApplication : Started WwwApplication in 4.162 seconds (JVM running for 4.863)

此时查看一下数据库表会发现新建有em_t表

新建表就这样完成。

如出现Error creating bean with name ‘startUpHandlerImpl’: Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/lang/ArrayUtils错误

说明pom缺省包或者包不正确

<!--以下两个类需要加入，否则报错无法注入--><dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.4</version></dependency><dependency><groupId>net.sf.json-lib</groupId><artifactId>json-lib</artifactId><version>2.4</version><classifier>jdk15</classifier><exclusions><exclusion><artifactId>commons-logging</artifactId><groupId>commons-logging</groupId></exclusion></exclusions></dependency>

如需要项目源码或者对代码有疑问的评论留言，下期会动手实现mybatis plus内嵌的CRUD自动增删改查

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