import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;

public final class DbQuery {
    public static void main(String[] args) throws Exception {
        if (args.length < 2) {
            throw new IllegalArgumentException("usage: DbQuery <database> <sql>");
        }
        String url = "jdbc:mysql://127.0.0.1:3306/" + args[0]
            + "?useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai"
            + "&useSSL=false&allowPublicKeyRetrieval=true";
        try (Connection connection = DriverManager.getConnection(url, "root", "123456");
             Statement statement = connection.createStatement()) {
            boolean hasResult = statement.execute(args[1]);
            if (!hasResult) {
                System.out.println("updateCount=" + statement.getUpdateCount());
                return;
            }
            try (ResultSet result = statement.getResultSet()) {
                ResultSetMetaData meta = result.getMetaData();
                for (int column = 1; column <= meta.getColumnCount(); column++) {
                    if (column > 1) System.out.print("\t");
                    System.out.print(meta.getColumnLabel(column));
                }
                System.out.println();
                while (result.next()) {
                    for (int column = 1; column <= meta.getColumnCount(); column++) {
                        if (column > 1) System.out.print("\t");
                        System.out.print(String.valueOf(result.getObject(column)));
                    }
                    System.out.println();
                }
            }
        }
    }
}