為什麼我會收到'找不到合適的驅動程式”SQLException？

SQLException: No Suitable Driver Found

Problem:

When attempting to establish a database connection through JDBC, a "No Suitable Driver Found" error occurs. This suggests that the necessary JDBC driver for the database is missing or not properly loaded.

Possible Causes:

• JDBC driver not loaded
• Incorrectly configured connection URL

Relevant Trace:

ERROR IN makeStatement
ERROR - java.sql.SQLException: No suitable driver found for 
 ERROR CODE: 0
SQLSTATE: 08001
java.sql.SQLException: No suitable driver found for 
        at java.sql.DriverManager.getConnection(DriverManager.java:602) // Line 72
        at message.Message.makeStatement(Message.java:72) // Line 72

Solution:

Check JDBC Driver Loading:

Verify that the JDBC driver for your database is included in the classpath. Ensure that the driver JAR file is present in the WEB-INF/lib directory of your web application and has been added to the classpath of your Java project or IDE.

Configure Connection URL Correctly:

The connection URL should specify the database type, host, port, and database name according to the following format:

jdbc:databaseType://host:port/databaseName

For example, for MySQL, the URL would be:

jdbc:mysql://localhost:3306/mydatabase

Make sure that the URL in your code matches this format and points to the correct database.

Additional Notes:

• It is recommended to use a separate Java class for database operations, rather than mixing Java code in JSP files.
• Exceptions should be properly thrown to prevent execution of subsequent code and facilitate error handling.

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