這篇文章主要介紹springboot+mybatis通過實體類如何自動生成數據庫表，文中介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們一定要看完！
前言
==9
首先引入相關的pom包我這里使用的是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> <!--以下兩個類需要加入，否則報錯無法注入--> <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>
添加數據庫配置文件application.properties
application.properties這里是單獨配置mybatis自動建表的相關信息。
mybatis.table.auto=update mybatis.model.pack=com.xxx.xxx.entity//實體類的路徑 mybatis.database.type=mysql
mybatis.table.auto=
create：
每次加載hibernate會自動創建表，以后啟動會覆蓋之前的表，所以這個值基本不用，嚴重會導致的數據的丟失。
create-drop ：
每次加載hibernate時根據model類生成表，但是sessionFactory一關閉，表就自動刪除，下一次啟動會重新創建。
update：
加載hibernate時根據實體類model創建數據庫表，這是表名的依據是@Entity注解的值或者@Table注解的值，sessionFactory關閉表不會刪除，且下一次啟動會根據實體。
model：
更新結構或者有新的實體類會創建新的表。
validate：
啟動時驗證表的結構，不會創建表 none：啟動時不做任何操作
mybatis.model.pack=com.xxx.xxx.entity//你實體類的路徑
個人項目配置文件，非統一，根據項目需求配置
進行生成數據庫表相關配置
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 {
//連接數據庫配置文件的地址，具體查閱配置文件的結構
@Value("${spring.datasource.druid.driver-class-name}")
private String driver;
//連接數據庫配置文件的地址，具體查閱配置文件的結構
@Value("${spring.datasource.druid.url}")
private String url;
//連接數據庫配置文件的地址，具體查閱配置文件的結構
@Value("${spring.datasource.druid.username}")
private String username;
//連接數據庫配置文件的地址，具體查閱配置文件的結構
@Value("${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固定的包路徑
//com.xxx.xxx.entity.*替換成你的實體類地址
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)//上面第一點配置文件類
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.*替換成你的mapper地址
//com.gitee.sunchenbin.mybatis.actable.dao.*固定的包
return mapperScannerConfigurer;
}
}新建實體進行測試
注：@Table(name = “”)及@Column（name = “id”）注解使用，實體類繼承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")//新建表數據庫表名
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
}運行項目
會控制臺會顯示說新建表完成
2020-07-08 11:02:13.895 INFO 48536 — [ main] s.m.a.m.s.SysMysqlCreateTableManagerImpl : 開始創建表：em_t
2020-07-08 11:02:13.983 INFO 48536 — [ main] s.m.a.m.s.SysMysqlCreateTableManagerImpl : 完成創建表：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，開始執行mysql的處理方法 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類型的掃描 2020-07-08 11:02:13.895 INFO 48536 --- [ main] s.m.a.m.s.SysMysqlCreateTableManagerImpl : 開始創建表：em_t 2020-07-08 11:02:13.983 INFO 48536 --- [ main] s.m.a.m.s.SysMysqlCreateTableManagerImpl : 完成創建表：em_t 2020-07-08 11:02:14.002 INFO 48536 --- [ main] c.q.www.config.RedisConfiguration : 自定義RedisCacheManager加載完成 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)
此時查看一下數據庫表會發現新建有em_t表
新建表就這樣完成。
如出現
Error creating bean with name ‘startUpHandlerImpl': Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: org/apache/commons/lang/ArrayUtils錯誤
說明pom缺省包或者包不正確
<!--以下兩個類需要加入，否則報錯無法注入--> <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>
如需要項目源碼或者對代碼有疑問的評論留言，下期會動手實現mybatis plus內嵌的CRUD自動增刪改查
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