如何将mariadb连接到springboot项目？
我根据mybatis/Spring-boot-starter.的Github主页指南制作了一个项目。
但是，在此项目中，正在创建db文件并正在编写代码。
但是我已经使用mariadb Tool制作了数据库。
所以我做了所有的事情。您现在要做的就是连接db。 db如何工作？
myDirectory：
我的pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>monitoring-smartcore</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>monitoring</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
MonitoringApplication.java
package com.smartcore.monitoring;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class MonitoringApplication {
public static void main(String[] args) {
SpringApplication.run(MonitoringApplication.class, args);
}
private final User_infoMapper user_infoMapper;
public MonitoringApplication(User_infoMapper user_infoMapper) {
this.user_infoMapper = user_infoMapper;
}
@Bean
CommandLineRunner sampleCommandLineRunner() {
return args -> {
User_info user_info = new User_info();
user_info.set_user_login_id("Testid");
user_info.set_password("test");
user_info.set_nick_name("testnickname");
user_info.set_real_name("testrealname");
user_info.set_wallet_address("testwalladdress");
user_infoMapper.insert(user_info);
System.out.println(this.user_infoMapper.findById(user_info.getId()));
};
}
}
MonitoringApplicationTests：
package com.example.monitoringsmartcore;
import static org.hamcrest.CoreMatchers.containsString;
import org.junit.ClassRule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.boot.test.rule.OutputCapture;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class MonitoringApplicationTests {
@ClassRule
public static OutputCapture out = new OutputCapture();
@Test
public void contextLoads() {
out.expect(containsString("idss,passwordd nickkk,reallnameee,testaddressssssss"));
}
}
** DatabaseConfig.java **
package com.smartcore.monitoring.db;
import javax.sql.DataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@Configuration
@MapperScan(basePackages="com.smartcore.monitoring.db.mapper")
@EnableTransactionManagement
public class DatabaseConfig {
@Bean
public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {
final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
sessionFactory.setDataSource(dataSource);
PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
sessionFactory.setMapperLocations(resolver.getResources("classpath:mybatis/mapper/*.xml"));
return sessionFactory.getObject();
}
@Bean
public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) throws Exception {
final SqlSessionTemplate sqlSessionTemplate = new SqlSessionTemplate(sqlSessionFactory);
return sqlSessionTemplate;
}
}
application.properties文件是
spring.datasource.url=jdbc:mariadb://localhost:3306/mydb
spring.datasource.username=mydb
spring.datasource.password=mydb
spring.datasource.driver-class-name=org.mariadb.jdbc.Driver
您需要一个解决方案。
谢谢。
我的错误是
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.6.RELEASE)
2019-06-26 18:16:37.232 INFO 3064 --- [ main] c.s.monitoring.MonitoringApplication : Starting MonitoringApplication on ttttt-MacBookPro.local with PID 3064 (/Users/tttttt/Documents/workspace-spring-tool-suite-4-4.3.0.RELEASE/monitoring-smartcore/target/classes started by tttttt in /Users/tttttttt/Documents/workspace-spring-tool-suite-4-4.3.0.RELEASE/monitoring-smartcore)
2019-06-26 18:16:37.236 INFO 3064 --- [ main] c.s.monitoring.MonitoringApplication : No active profile set, falling back to default profiles: default
2019-06-26 18:16:38.044 WARN 3064 --- [ main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'monitoringApplication': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'user_infoMapper' defined in file [/Users/tttttttt/Documents/workspace-spring-tool-suite-4-4.3.0.RELEASE/monitoring-smartcore/target/classes/com/smartcore/monitoring/db/mapper/User_infoMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'sqlSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: org.mysql.jdbc.Driver
2019-06-26 18:16:38.056 INFO 3064 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-06-26 18:16:38.081 ERROR 3064 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'monitoringApplication': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'user_infoMapper' defined in file [/Users/tttttt/Documents/workspace-spring-tool-suite-4-4.3.0.RELEASE/monitoring-smartcore/target/classes/com/smartcore/monitoring/db/mapper/User_infoMapper.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'sqlSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: org.mysql.jdbc.Driver
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:769) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:218) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1341) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1187) ~[spring-beans-5.1.8.RELEASE.jar:5.1.8
1 个答案:
答案 0 :(得分：0)
好吧，首先，您应该在pom.xml中添加依赖项
[INFO ] [Base ] Start application main loop
[ERROR ] [Base ] No event listeners have been created
[ERROR ] [Base ] Application will leave
[INFO ] [Base ] Leaving application in progress...
[INFO ] [Base ] Leaving application in progress...
Traceback (most recent call last):
File "<ipython-input-2-30ebdb31c7db>", line 17, in <module>
PongApp().run()
File "C:\Users\almig\Anaconda3\lib\site-packages\kivy\app.py", line 855, in run
runTouchApp()
File "C:\Users\almig\Anaconda3\lib\site-packages\kivy\base.py", line 506, in runTouchApp
stopTouchApp()
File "C:\Users\almig\Anaconda3\lib\site-packages\kivy\base.py", line 521, in stopTouchApp
EventLoop.close()
File "C:\Users\almig\Anaconda3\lib\site-packages\kivy\base.py", line 172, in close
self.stop()
File "C:\Users\almig\Anaconda3\lib\site-packages\kivy\base.py", line 184, in stop
provider.stop()
File "C:\Users\almig\Anaconda3\lib\site-packages\kivy\input\providers\wm_pen.py", line 111, in stop
SetWindowLong_WndProc_wrapper(self.hwnd, self.old_windProc)
File "C:\Users\almig\Anaconda3\lib\site-packages\kivy\input\providers\wm_common.py", line 122, in _closure
oldAddr = func(hWnd, GWL_WNDPROC, cast(wndProc, c_void_p).value)
ArgumentError: argument 3: <class 'TypeError'>: wrong type
注意：您已经在.properties文件中写入了数据源。所以跳过这一步。
第二，设置数据访问类。或使用方便的模块。例如）DAO，Data JPA，MyBatis等... 就我而言，我只是使用DAO。
<dependency>
<groupId>org.mariadb.jdbc</groupId>
<artifactId>mariadb-java-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
第三，对其进行测试。
@Repository
public class SimpleMessageDAO {
@Autowired JdbcTemplate jt;
public List<Map<String, ?>> selectAll() {
// if you don't know lambda, don't use it.
return jt.query("select * from simple_message", (rs, rowNum) -> {
Map<String, Object> map = new HashMap<>();
map.put("user_login_id", rs.getInt(1));
map.put("password", rs.getString(2));
map.put("nick_name", rs.getString(3));
return map;
});
}
}
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