IDEA连接Database报错Driver class ‘com.mysql.cj.jdbc.Driver

这个错误可能是由于没有正确配置 MySQL 数据库驱动程序引起的。您可以按照以下步骤解决此问题：

1. 确保您已经下载了 MySQL JDBC 驱动程序，可以从MySQL官方网站下载。

2. 在 IDEA 中打开项目，单击 File -> Project Structure。

3. 在左侧面板中选择 "Libraries" ，然后单击右侧面板的 “+” 添加新的库。

4. 选择 "Java" ，然后选择 MySQL JDBC 驱动程序的 JAR 文件。单击 OK 以添加该库。

5. 在 IDEA 中打开 Database 工具窗口。

6. 单击 “+” 添加新的数据源，选择 MySQL。

7. 在 “Driver” 字段中，确保已经选择了正确的 MySQL JDBC 驱动程序。

8. 在 “URL” 字段中，输入您的 MySQL 数据库连接信息，例如：jdbc:mysql://localhost:3306/mydatabase。

9. 输入您的用户名和密码，然后单击 “Test Connection” 按钮，确保可以成功连接到 MySQL 数据库。

10. 单击 “Apply” 和 “OK” 按钮，保存更改并关闭窗口。

现在，您应该能够成功连接到您的 MySQL 数据库了。如果问题仍然存在，请检查您的 MySQL 数据库连接信息以及 MySQL JDBC 驱动程序是否正确配置。

相关问题

Driver class 'com.mysql.cj.jdbc.Driver' not found.

This error message typically occurs when attempting to establish a connection to a MySQL database using JDBC, but the MySQL JDBC driver is not included in the classpath of the application or server.

To resolve this issue, you should download the MySQL JDBC driver from the official website and add it to the classpath. This can be done by either adding the JAR file to the project dependencies or by adding it to the server's classpath.

If you are using an IDE, such as Eclipse or IntelliJ IDEA, you can add the MySQL JDBC driver to your project by right-clicking on the project and selecting "Build Path" > "Configure Build Path" > "Libraries" > "Add External JARs" and selecting the downloaded JAR file.

If you are running a Java application from the command line, you can add the MySQL JDBC driver to the classpath using the "-cp" or "-classpath" option. For example:

java -cp mysql-connector-java-8.0.26.jar MyApplication

Alternatively, you can set the CLASSPATH environment variable to include the path to the MySQL JDBC driver.

It is important to ensure that the driver class name used in the JDBC connection URL matches the actual driver class name in the JAR file. For MySQL 8.0 or later, the driver class name is "com.mysql.cj.jdbc.Driver".

n thread "main" java.lang.ClassNotFoundException: com.mysql.jdbc.Driver

This error occurs when the Java Virtual Machine (JVM) is unable to find the required JDBC driver for connecting to a MySQL database. Here are some possible solutions to fix this error:

1. Check if the MySQL JDBC driver JAR file is included in the classpath of your Java project. You can download the latest version of the driver from the official MySQL website and add it to your project's build path.

2. Check if the class name for the JDBC driver is spelled correctly. The correct class name for MySQL JDBC driver is "com.mysql.cj.jdbc.Driver".

3. Check if the JDBC URL for connecting to the MySQL database is correct. It should be in the format "jdbc:mysql://hostname:port/databaseName".

4. Check if the MySQL server is running and accessible from your Java application. You can test the connection using a MySQL client tool like MySQL Workbench.

5. If you are using an IDE like Eclipse or IntelliJ IDEA, try refreshing the project or rebuilding it to ensure that all dependencies are properly resolved.

6. If none of the above solutions work, try restarting your computer or IDE as sometimes the JVM can get stuck and fail to load the driver.