public static QueryExpresion Append(this QueryExpresion expr, string junction, string nextExpression)
{
if (!string.IsNullOrEmpty(nextExpression) && !string.IsNullOrEmpty(junction))
{
expr.Junction = junction;
expr.Last().NextExpression = new QueryExpresion(nextExpression);
}
return(expr);
}
public static QueryExpresion And(this QueryExpresion expr, string nextExpression)
{
if (!string.IsNullOrEmpty(nextExpression))
{
expr.Junction = SqlUtil.AND;
expr.Last().NextExpression = new QueryExpresion(SqlUtil.AND, nextExpression);
}
return(expr);
}
/// <summary>
/// Returns the last expression of the query string
/// </summary>
/// <param name="expr"></param>
/// <returns></returns>
public static QueryExpresion Last(this QueryExpresion expr)
{
QueryExpresion result = expr;
while (expr.NextExpression != null)
{
result = expr.NextExpression;
expr = result;
}
return(result);
}
public virtual string ToString(QueryExpresion last)
{
return(last.ToString());
}