How Spring connects to Mysql database

1. Create a Maven project

##2. Import the coordinates

 Add the following coordinates in

pom.xml, And click refresh in the upper right corner.

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.3.15</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.3.15</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.25</version>
        </dependency>
    </dependencies>

3. Managed DataSource class

 Create a class named

AppConfig. Host the DataSource class and add the @Configuration annotation. Pay attention to setting the specified URL, username, and password to connect to the database.

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import javax.sql.DataSource;


@Configuration
public class AppConfig {

    @Bean
    public DataSource dataSource(){
        DriverManagerDataSource d = new DriverManagerDataSource() ;
        d.setUrl("jdbc:mysql://localhost:3306/test?serverTimezone=UTC"); //设置url
        // 上述的test为你的数据库名
        d.setUsername("root"); //设置账号
        d.setPassword("root"); //设置密码
        return d;
    }

}

4. Test

 Create a

Test class. Get the database connection through DataSource. and output.

import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;

public class Test {


    public static void main(String[] args) throws SQLException {
        ApplicationContext ac = new AnnotationConfigApplicationContext(AppConfig.class);
        DataSource d = (DataSource) ac.getBean("dataSource");
        Connection c = d.getConnection(); //获取连接
        System.out.println(c);
    }
}

The following code appears on the console, which means the connection is successful.

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