Question

我是spring框架的新手，我想将位于MySQL的{{1}}数据库与spring boot应用程序连接。

Answer 1

要与mysql连接，需要以下依赖项

依赖关系（maven-> pom.xml）。

<dependencies>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
  <dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
  </dependency>
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
  </dependency>
</dependencies>

application.properties中的

需要一些额外的配置设置，必须像这样

application.properties（src / main / resources / application.properties）

# DataSource settings: set here your own configurations for the database 
# connection. In this example we have "netgloo_blog" as database name and 
# "root" as username and password.
spring.datasource.url = jdbc:mysql://localhost:8889/database_name
spring.datasource.username = mysql-userId
spring.datasource.password = mysql-pwd

# Keep the connection alive if idle for a long time (needed in production)
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1

# Show or not log for each sql query
spring.jpa.show-sql = true

# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update

# Naming strategy (Not necessary to add but you can use this too)
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy

# Use spring.jpa.properties.* for Hibernate native properties (the prefix is
# stripped before adding them to the entity manager)

# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

现在，当您启动spring boot配置时，您的EntityManager对象将被构造。

上面定义的配置足以连接您的本地my-sql数据库，但这是您需要使代码更具可读性的更多配置。

启用JPAR存储库，以便必须在已定义的程序包中定义CRUD存储库。

像这样将@EnableJPARepositories("basepackage.*")添加到您的SpringBootMainApplicationClass中。

@SpringBootApplication
@EnableJPARepositories("com.demo.application.*.repositories")
@ComponentScan("com.demo.application.*")
public class SpringBootMainApplicationClass {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootMainApplicationClass.class, args);
    }
}

通过在@EnableJPARepositories中添加MainClass注释，用户可以使您的代码更具可读性，并且EntityManager对象仅限于定义的包。

Answer 2

我正在列出最低配置：

在pom.xml中

<!-- JPA Data (We are going to use Repositories, Entities, Hibernate, etc...) -->

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <!-- Use MySQL Connector-J -->

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

在application.properties中

spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost:3306/db_example
spring.datasource.username=springuser
spring.datasource.password=ThePassword

到处都有这样的例子。喜欢阅读https://spring.io/guides/gs/accessing-data-mysql/

来源：https://spring.io

也请查看其他问题：

How to use Spring Boot with MySQL database and JPA?

Spring Boot MYSQL connection

Spring boot - MySQL settings are not working

Answer 3

您需要在application.properties中添加Mysql的数据库配置属性：

spring.jpa.hibernate.ddl-auto=create
spring.datasource.url=jdbc:mysql://localhost:3306/db_example
spring.datasource.username=mysql
spring.datasource.password=mysql

spring.jpa.hibernate.ddl-auto=create，此配置将根据您创建的实体创建表。
spring.datasource.url=jdbc:mysql://localhost:3306/db_example，此配置通过jdbc连接到名为db_example的数据库。您需要创建该数据库。
spring.datasource.username=mysql这种配置，您需要将要通过jdbc连接到您的mysql数据库的用户放进去。
spring.datasource.password=mysql这种配置，您需要提供由用户代表的密码，以便通过jdbc连接到您的mysql数据库。

除了您还需要添加Mysql和JPA的依赖项。

如果使用的是maven，请在pom.xml中添加依赖项：

<dependencies>
    <!-- JPA Data (We are going to use Repositories, Entities, Hibernate, etc...) -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>

    <!-- Use MySQL Connector-J -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
</dependencies>

如果使用的是gradle，请在build.gradle中添加依赖项：

dependencies {
    // JPA Data (We are going to use Repositories, Entities, Hibernate, etc...)
    compile 'org.springframework.boot:spring-boot-starter-data-jpa'

    // Use MySQL Connector-J
    compile 'mysql:mysql-connector-java' 
}

Answer 4

在pom.xml中添加以下依赖项。

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
</dependency>

在application.properties中添加以下数据库属性。

spring.datasource.url=jdbc:mysql://localhost:3306/dbname
spring.datasource.username=root
spring.datasource.password=root

有关更多详细信息，请参阅此link

Answer 5

application.properties

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/jpa
spring.datasource.username = root
spring.datasource.password =
spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto = update
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

build.gradle

implementation 'mysql:mysql-connector-java:8.0.15'

如何将Spring Boot Application与MySQL数据库连接？

5 个答案: