java - 尝试进行数据库连接时出现 InvalidConnectionAttributeException

Question

尝试获取数据库连接时遇到 InvalidConnectionAttributeException。

    import java.sql.*;

    public class JdbcTest {

        public static void main (String[] args) throws SQLException {

            Connection con= null;
            Statement st=  null;
            ResultSet rs= null;

            try {
                // get connection to database

                con= DriverManager.getConnection("jdbc:mysql://localhost:3306/demo", "st", "st");
                System.out.println("Connection has created successfuly !");

                // create a statement

                st= con.createStatement();

                // Execute sql query

                rs= st.executeQuery("SELECT * FROM demo.employees;");

                // process the result set

                while (rs.next()) {
                    System.out.println(rs.getString("last_name")+", "+rs.getString("first_name"));
                }

                con.close();
            }
            catch (Exception exc){

                exc.printStackTrace();

            }

        }

    }

这是我的程序的输出:

 at java.sql.DriverManager.getConnection(Unknown Source)
        at JdbcTest.main(JdbcTest.java:15)
    Caused by: com.mysql.cj.exceptions.InvalidConnectionAttributeException: The server time zone value 'Maroc' is unrecognized or represents more than one time zone. You must configure either the server or JDBC driver (via the serverTimezone configuration property) to use a more specifc time zone value if you want to utilize time zone support.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
        at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:85)
        at com.mysql.cj.util.TimeUtil.getCanonicalTimezone(TimeUtil.java:132)
        at com.mysql.cj.protocol.a.NativeProtocol.configureTimezone(NativeProtocol.java:2243)
        at com.mysql.cj.protocol.a.NativeProtocol.initServerSession(NativeProtocol.java:2267)
        at com.mysql.cj.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:1319)
        at com.mysql.cj.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:966)
        at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:825)
        ... 6 more

有人可以告诉我问题是什么吗？谢谢。

Answer 1

正在使用的服务器时区“Maroc”无效。

要查看设置为什么值，请使用SELECT @@global.time_zone;

尝试在 my.cnf 文件中通过 default-time-zone 设置时区 例如: default-time-zone='+00:00'

要将其设置为当前 session ，请执行以下操作: SET time_zone = timezonename;