public LikeExpressionBuilder(Operator oper)
{
_expression = new LikeExpression
{
Operator = oper
};
}
public override void Visit(LikeExpression e)
{
_expression.SetOperand(e);
}
public virtual void Visit(LikeExpression e)
{
throw new NotSupportedException();
}
public virtual void Visit(LikeExpression e)
{
e.Column.Accept(this);
switch (e.Operator)
{
case Operator.LikeStartsWith:
case Operator.LikeContains:
case Operator.LikeEndsWith:
_sql.Append(" LIKE ");
break;
case Operator.NotLikeStartsWith:
case Operator.NotLikeContains:
case Operator.NotLikeEndsWith:
_sql.Append(" NOT LIKE ");
break;
default:
throw new ArgumentOutOfRangeException();
}
var value = (string)e.Value.Value;
switch (e.Operator)
{
case Operator.LikeStartsWith:
case Operator.NotLikeStartsWith:
value = value + "%";
break;
case Operator.LikeEndsWith:
case Operator.NotLikeEndsWith:
value = "%" + value;
break;
case Operator.LikeContains:
case Operator.NotLikeContains:
value = "%" + value + "%";
break;
default:
throw new ArgumentOutOfRangeException();
}
e.Value.Value = value;
Visit(e.Value);
}
public override void Visit(LikeExpression e)
{
_expression.Operand = e;
}
