我想在Spring启动时在mysql中创建新的数据库模式,因为它是通过命令行完成的 - > 创建数据库[schema-name]
我该如何实现?
我正在使用hibernate,jpa
答案 0 :(得分:0)
我想你想以编程方式创建数据库。
您可以使用以下代码来完成此任务:
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
@Component
public class ApplicationStartup implements ApplicationListener<ApplicationReadyEvent> {
@Value("${database:DEMODB}")
private String database;
/**
* This event is executed as late as conceivably possible to indicate that
* the application is ready to service requests.
*/
@Override
public void onApplicationEvent(final ApplicationReadyEvent event) {
// Defines the JDBC URL. As you can see, we are not specifying
// the database name in the URL.
String url = "jdbc:mysql://localhost";
// Defines username and password to connect to database server.
String username = "root";
String password = "master";
// SQL command to create a database in MySQL.
String sql = "CREATE DATABASE IF NOT EXISTS " + database;
try (Connection conn = DriverManager.getConnection(url, username, password);
PreparedStatement stmt = conn.prepareStatement(sql)) {
stmt.execute();
} catch (Exception e) {
e.printStackTrace();
}
}
}
确保在运行时通过组件扫描发现此组件。
您可以使用命令行传递数据库名称,如下所示:
java -jar spring-boot-app.jar --database = test_db
如果未指定数据库 - 此代码将创建名为DEMODB的DB。 请参阅&#39;数据库中的@Value注释。字段。