public static SelectWhereColumnBase ParseWhereColumn(string name)
{
SelectWhereColumnBase columnBase = null;
int number;
if (name.IsQuoted() || int.TryParse(name, out number))
{
columnBase = new SelectWhereRawColumn(name);
}
else if (char.IsLetter(name[0]))
{
columnBase = new SelectWhereFieldColumn(name);
}
return(columnBase);
}
private string GetWhereClauseAttributeName(SelectWhereColumnBase whereColumn)
{
switch (whereColumn.Type)
{
case SelectColumnTypeEnum.Field:
var fieldColumn = (SelectWhereFieldColumn)whereColumn;
return(fieldColumn.Name);
case SelectColumnTypeEnum.Raw:
var rawColumn = (SelectWhereRawColumn)whereColumn;
return(rawColumn.Value.CleanRaw());
}
throw new NotSupportedException();
}
public SelectWhereComparison(SelectWhereColumnBase leftExpression, SelectWhereComparisonOperatorEnum @operator, SelectWhereColumnBase rightEpression)
{
LeftExpression = leftExpression;
Operator = @operator;
RightExpression = rightEpression;
}
public SelectWhereNull(SelectWhereColumnBase expression)
{
Expression = expression;
}
public SelectWhereLike(SelectWhereColumnBase leftExpression, SelectWhereColumnBase rightExpression)
{
LeftExpression = leftExpression;
RightExpression = rightExpression;
}