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

org.mybatis.spring.boot

mybatis-spring-boot-starter

2.1.0

com.gitee.sunchenbin.mybatis.actable

mybatis-enhance-actable

1.0.1

mysql

mysql-connector-java

runtime

com.alibaba

druid-spring-boot-starter

1.1.10

org.apache.commons

commons-lang3

3.4

net.sf.json-lib

json-lib

2.4

jdk15

commons-logging

commons-logging

添加数据库配置文件application.properties

application.properties这里是单独配置mybatis自动建表的相关信息。

mybatis.table.auto=update

mybatis.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_t

2020-07-08 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:\mysoft\kaifasoft\kaifa_code\idea\myiperf_springboot\target\classes started by DD in E:\mysoft\kaifasoft\kaifa_code\idea\myiperf_springboot)

2020-07-08 11:02:11.266 INFO 48536 --- [ main] com.qiaoyuantest.www.WwwApplication : The following profiles are active: prod

2020-07-08 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 WebApplicationContext

2020-07-08 11:02:13.036 INFO 48536 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1732 ms

2020-07-08 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} inited

file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_t

2020-07-08 11:02:13.983 INFO 48536 --- [ main] s.m.a.m.s.SysMysqlCreateTableManagerImpl : 完成创建表：em_t

2020-07-08 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

org.apache.commons

commons-lang3

3.4

net.sf.json-lib

json-lib

2.4

jdk15

commons-logging

commons-logging

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

到此这篇关于springboot+mybatis通过实体类自动生成数据库表的方法的文章就介绍到这了,更多相关springboot mybatis实体类生成数据库表内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！