[英]How to create a simple CRUD application using Spring Data JPA and MYSQas DB using SpringBoot?
I'm trying to create a simple dummy application using Spring Boot Version 1.4.4. 我正在尝试使用Spring Boot版本1.4.4创建一个简单的虚拟应用程序。 Here is how my pom.xml
looks like : 这是我的pom.xml
样子:
<?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>
<groupId>com.bootstrap</groupId>
<artifactId>bootstrap</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>tsqln</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</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>
My application class looks like: 我的应用程序类如下:
package com.bootstrap;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class TsqlnApplication {
public static void main(String[] args) {
SpringApplication.run(TsqlnApplication.class, args);
}
}
And my application.properties looks like : 我的application.properties看起来像:
spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost:3306/lostandfound
spring.datasource.username=root
spring.datasource.password=root
But when I run the application I get the following error stating : 但是,当我运行该应用程序时,出现以下错误说明:
*****************************
APPLICATION FAILED TO START
***************************
Description:
Parameter 0 of constructor in org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration required a bean of type 'javax.sql.DataSource' that could not be found.
- Bean method 'dataSource' not loaded because @ConditionalOnClass did not find required class 'org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType'
- Bean method 'dataSource' not loaded because @ConditionalOnClass did not find required class 'org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType'
Action:
Consider revisiting the conditions above or defining a bean of type 'javax.sql.DataSource' in your configuration.
2017-01-29 17:32:44.645 ERROR 4316 --- [ main] o.s.test.context.TestContextManager : Caught exception while allowing TestExecutionListener [org.springframework.test.context.web.ServletTestExecutionListener@516be40f] to prepare test instance [com.bootstrap.TsqlnApplicationTests@9573b3b]**
My directory structure for project is : 我的项目目录结构是:
However with the same approach the above application works with SpringBoot version 1.3. 但是,使用相同的方法,上述应用程序可用于SpringBoot 1.3版。 Any suggestions how to make it work with version 1.4.4? 关于如何使其与1.4.4版兼容的任何建议?
Make sure your mysql-connector is actually there in the classpath at runtime (if your using Tomcat, then it should be in the lib folder). 确保您的mysql-connector实际上在运行时位于类路径中(如果使用的是Tomcat,则它应位于lib文件夹中)。
If you do not have it there add a compile dependency in your pom.xml 如果没有,则在pom.xml中添加一个编译依赖项
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.36</version>
</dependency>
Also you forgot about this line in your application.properties
: 您也忘记了application.properties
这一行:
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
in your application.properties add this lines 在您的application.properties中添加以下行
spring.datasource.url = jdbc:mysql://localhost:3306/yourdatabase
# Username and password
spring.datasource.username = root
spring.datasource.password =
# Show or not log for each sql query
spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto = create
# Naming strategy
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
# Allows Hibernate to generate SQL optimized for a particular DBMS
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
You can restore that behaviour by creating your own datasource bean: 您可以通过创建自己的数据源bean来恢复该行为:
@Bean
public DataSource dataSource() {
return DataSourceBuilder
.create()
.username("")
.password("")
.url("")
.driverClassName("")
.build();
}
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