如何使用Spring的JdbcTemplate连接到一个简单的MySql数据库？
我试图使用Spring的JdbcTemplate类连接到基于本教程的简单MySql数据库。 实际上，我使用了他们的项目设置：
的pom.xml
4.0.0 test jdbc-test 0.0.1-SNAPSHOT org.springframework.boot spring-boot-starter-parent 1.2.2.RELEASE org.springframework.boot spring-boot-starter org.springframework spring-jdbc mysql mysql-connector-java org.projectlombok lombok 1.14.8 provided org.springframework.boot spring-boot-maven-plugin Lombok依赖是针对getter和setter的。
然后是Application类：
package test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.CommandLineRunner; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.jdbc.core.JdbcTemplate; @SpringBootApplication public class Application implements CommandLineRunner { public static void main(String args[]) { SpringApplication.run(Application.class, args); } @Autowired JdbcTemplate jdbcTemplate; @Override public void run(String... arg0) throws Exception { System.out.println("Creating tables"); jdbcTemplate.execute("drop table customers if exists"); jdbcTemplate.execute("create table customers(" + "id serial, first_name varchar(255), last_name varchar(255))"); } }
最后一个客户pojo：
package test; import lombok.AllArgsConstructor; import lombok.Data; @Data @AllArgsConstructor public class Customer { private long id; private String firstName, lastName; }
对于数据源配置，我的资源文件夹中有一个application.properties文件：
spring.datasource.url=jdbc:mysql://localhost:3306/test spring.datasource.username=test spring.datasource.password=test spring.datasource.driver-class-name=com.mysql.jdbc.Driver spring.jpa.database = MYSQL spring.jpa.show-sql = true spring.jpa.hibernate.ddl-auto = update spring.jpa.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect spring.jpa.hibernate.naming_strategy = org.hibernate.cfg.ImprovedNamingStrategy
数据库已启动并正在运行，但仍然无法使用autowirig。 以下是我尝试运行时遇到的exception：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'application': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory. BeanCreationException: Could not autowire field: org.springframework.jdbc.core.JdbcTemplate test.Application.jdbcTemplate; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.jdbc.core.JdbcTemplate] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1202) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686) at org.springframework.boot.SpringApplication.run(SpringApplication.java:320) at org.springframework.boot.SpringApplication.run(SpringApplication.java:957) at org.springframework.boot.SpringApplication.run(SpringApplication.java:946) at test.Application.main(Application.java:12) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:53) at java.lang.Thread.run(Unknown Source) Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: org.springframework.jdbc.core.JdbcTemplate test.Application.jdbcTemplate; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.jdbc.core.JdbcTemplate] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331) ... 21 common frames omitted Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [org.springframework.jdbc.core.JdbcTemplate] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)} at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1301) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533) ... 23 common frames omitted
我觉得奇怪的是，如果我用com.h2数据库替换mysql-connector-java dependeny，它就可以正常工作（如spring示例中所示）。
我是否需要以不同的方式配置mysql数据源？ 有什么建议么？
添加以下依赖项：
org.springframework.boot spring-boot-starter-jdbc
这将自动配置数据源