VS Code中Telosys连接MySQL数据库失败问题求助

Let’s walk through the common issues that might be causing this connection failure when using Telosys with MySQL 8.0, and fix them step by step:

• Fix the JDBC URL for MySQL 8.0 compatibility
  MySQL 8.0 requires explicit timezone configuration in the JDBC URL, and local setups often need SSL disabled to avoid certificate errors. Your current URL is missing these critical parameters. Update it to:

url = "jdbc:mysql://localhost:3306/your_actual_db_name?serverTimezone=UTC&useSSL=false&allowPublicKeyRetrieval=true"

Replace your_actual_db_name with the exact name of your MySQL database (skip "MySQL80" unless that’s the real DB name you created). The allowPublicKeyRetrieval=true flag resolves common authentication hiccups with MySQL 8.0.

• Correct the metadata schema and table pattern
  In your metadata section:
  • Replace the **** placeholder in schema="****" with your actual database name (MySQL uses the database name as the default schema).
  • The table-name-pattern="%user" will only match tables ending with "user". If you want to fetch all tables in the database, change this to table-name-pattern="%".

Updated metadata snippet:

<metadata catalog="" schema="your_actual_db_name" table-name-pattern="%" table-types="TABLE VIEW" table-name-exclude="" table-name-include="" />

• Verify the JDBC driver setup

  • Ensure the mysql-connector-java-8.0.19.jar is placed directly in the TelosysTools/lib folder (no nested subfolders—Telosys needs direct access to the jar).
  • Check for older MySQL JDBC drivers (like 5.x versions) in the lib folder—these can cause version conflicts with MySQL 8.0. Delete any outdated drivers if present.

• Confirm database user access

  • Test your root credentials directly in MySQL to rule out permission issues:

    mysql -u root -p
    USE your_actual_db_name;
    SHOW TABLES;
    

  If this fails, reset the root password or grant the user full access to the target database from localhost.

• Validate the driver class
  You’re using com.mysql.cj.jdbc.Driver which is the correct driver class for MySQL 8.0 (the old com.mysql.jdbc.Driver is deprecated). This part of your config is already set up correctly.

After applying these changes, run the cdb command again to test the connection.

内容的提问来源于stack exchange，提问作者Philip