Comments - MariaDB server version for the right syntax to use near 'WHERE id =1'
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You should probably use a prepared statement instead of combining values into a string. That's a classic case for SQL injection to occur. Here's a short example of how you could add this into the code:
statement = con.prepareStatement("SELECT * FROM clinic WHERE id = ?"); statement.setInt(1, id); resultSet = statement.executeQuery();