java.sql.SQLSyntaxErrorException: Unknown database ‘covid‘

java.sql.SQLSyntaxErrorException: Unknown database 'covid'
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120) ~[mysql-connector-java-8.0.18.jar:8.0.18]
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97) ~[mysql-connector-java-8.0.18.jar:8.0.18]
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122) ~[mysql-connector-java-8.0.18.jar:8.0.18]
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836) ~[mysql-connector-java-8.0.18.jar:8.0.18]
	at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:456) ~[mysql-connector-java-8.0.18.jar:8.0.18]
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246) ~[mysql-connector-java-8.0.18.jar:8.0.18]
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199) ~[mysql-connector-java-8.0.18.jar:8.0.18]
	at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:138) ~[HikariCP-3.4.1.jar:na]
	at com.zaxxer.hikari.pool.Poolbase.newConnection(Poolbase.java:353) ~[HikariCP-3.4.1.jar:na]
	```
	![在这里插入图片描述](https://img-blog.csdnimg.cn/226704515508444cac02c03af8c3b6bb.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5rGq56iL5bqP54y_,size_20,color_FFFFFF,t_70,g_se,x_16)
这时候，去数据库建库covid。
![在这里插入图片描述](https://img-blog.csdnimg.cn/619756d27a484163bade2d701015f250.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5rGq56iL5bqP54y_,size_15,color_FFFFFF,t_70,g_se,x_16)

再次运行。

![在这里插入图片描述](https://img-blog.csdnimg.cn/6ec18dd3950f4a428b2c2e9d879a69b3.png?x-oss-process=image/watermark,type_d3F5LXplbmhlaQ,shadow_50,text_Q1NETiBA5rGq56iL5bqP54y_,size_20,color_FFFFFF,t_70,g_se,x_16)
成功！！！