[SOLVED] How can I determine if the column name exist in the ResultSet?

How can I determine if the column name exist in the ResultSet?

As the ResultSet contains the data returned from the dynamic SQL, if there are any method to determine if the ResultSet contains a particular column name?

For example , if I run rs.getString("Column_ABC") but "Column_ABC" does not really exist, it will throw out the exception.

How can I test if the ResultSet can get a data from a column named "Column_ABC"?

Solution

Use the ResultSetMetaData class.

public static boolean hasColumn(ResultSet rs, String columnName) throws SQLException {
    ResultSetMetaData rsmd = rs.getMetaData();
    int columns = rsmd.getColumnCount();
    for (int x = 1; x <= columns; x++) {
        if (columnName.equals(rsmd.getColumnName(x))) {
            return true;
        }
    }
    return false;
}

The thing I don't understand is why this function would ever be needed. The query or stored procedure being executed should have known results. The columns of the query should be known. Needing a function like this may be a sign that there is a design problem somewhere.