Loaded JDBC driver: com.mysql.cj.jdbc.Driver
时间: 2023-11-16 21:57:25 浏览: 61
这个引用提到了在数据库版本为8.0时,需要将jdbc.driver修改为com.mysql.cj.jdbc.Driver。这个修改是因为在8.0版本中,MySQL Connector/J驱动程序已经升级到了8.0版本,而这个驱动程序的类名也发生了变化。因此,如果你想在8.0版本中使用MySQL数据库,就需要将jdbc.driver修改为com.mysql.cj.jdbc.Driver。
相关问题
An error occurred: com.mysql.cj.jdbc.Driver怎么回事
The error message "An error occurred: com.mysql.cj.jdbc.Driver" usually occurs when you're trying to connect to a MySQL database using Java, specifically using the JDBC (Java Database Connectivity) API and the MySQL Connector/J driver. The `com.mysql.cj.jdbc.Driver` is the JDBC driver for MySQL, but it seems there's an issue during the connection.
Here are some possible reasons and solutions:
1. **Driver not found or loaded**: Make sure that the MySQL Connector/J jar (mysql-connector-java-x.x.x.jar) is in your classpath or added as a dependency to your project. You can download it from the official website and add it manually or via build tools like Maven or Gradle.
2. **Incorrect JDBC URL**: Double-check your JDBC URL format, which should look like `jdbc:mysql://[hostname]:[port]/[database]?serverTimezone=[timezone]`. Ensure all parts are correct.
3. **Incorrect credentials**: Verify that you have provided valid username and password for the MySQL user you're trying to connect as.
4. **Database not running**: Confirm if the MySQL server is up and running, and that the specified database exists.
5. **Incompatible versions**: If you're using an older version of the driver with a newer MySQL server, compatibility issues might arise. Upgrade or adjust accordingly.
6. **Error in code**: There could be a coding error, like a missing connection statement, wrong handling of exceptions, or incorrect use of the driver.
To resolve this, try these steps, and if the issue persists, please provide more context or the exact code snippet where the error is occurring so I can help further.
Class.forName(com.mysql.cj.jdbc.Driver)
`Class.forName` 是Java中的一个静态方法,用于加载给定的类。在与MySQL数据库交互时,`com.mysql.cj.jdbc.Driver` 是MySQL Connector/J驱动程序的类名,它允许Java应用程序连接到MySQL数据库。
当你调用 `Class.forName("com.mysql.cj.jdbc.Driver")` 时,它会尝试查找并加载这个类。这通常在尝试执行数据库操作(如创建`Connection`对象)之前进行,因为Java虚拟机需要知道如何解析数据库连接的JDBC URL。
以下是一个简单的示例,展示了如何使用`Class.forName`来动态加载MySQL驱动:
```java
try {
Class.forName("com.mysql.cj.jdbc.Driver");
System.out.println("MySQL JDBC driver loaded successfully.");
} catch (ClassNotFoundException e) {
System.err.println("Error loading MySQL JDBC driver: " + e.getMessage());
}
```
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