protected override Expression VisitUpdate(UpdateCommand update)
{
this.Write("UPDATE ");
this.WriteTableName(update.Table.Name);
this.WriteLine(Indentation.Same);
bool hideColumnAliases = this.HideColumnAliases;
this.HideColumnAliases = true;
this.Write("SET ");
int num = 0;
int count = update.Assignments.Count;
while (num < count)
{
ColumnAssignment assignment = update.Assignments[num];
if (num > 0)
{
this.Write(", ");
}
this.Visit(assignment.Column);
this.Write(" = ");
this.Visit(assignment.Expression);
num++;
}
if (update.Where != null)
{
this.WriteLine(Indentation.Same);
this.Write("WHERE ");
this.VisitPredicate(update.Where);
}
this.HideColumnAliases = hideColumnAliases;
return(update);
}
protected virtual ColumnAssignment VisitColumnAssignment(ColumnAssignment ca)
{
ColumnExpression c = (ColumnExpression)this.Visit(ca.Column);
Expression e = this.Visit(ca.Expression);
return(this.UpdateColumnAssignment(ca, c, e));
}
protected virtual ReadOnlyCollection <ColumnAssignment> VisitColumnAssignments(ReadOnlyCollection <ColumnAssignment> assignments)
{
List <ColumnAssignment> list = null;
int count = 0;
int num2 = assignments.Count;
while (count < num2)
{
ColumnAssignment item = this.VisitColumnAssignment(assignments[count]);
if ((list == null) && (item != assignments[count]))
{
list = assignments.Take <ColumnAssignment>(count).ToList <ColumnAssignment>();
}
if (list != null)
{
list.Add(item);
}
count++;
}
if (list != null)
{
return(list.AsReadOnly());
}
return(assignments);
}
protected ColumnAssignment UpdateColumnAssignment(ColumnAssignment ca, ColumnExpression c, Expression e)
{
if ((c != ca.Column) || (e != ca.Expression))
{
return(new ColumnAssignment(c, e));
}
return(ca);
}
protected override ColumnAssignment VisitColumnAssignment(ColumnAssignment ca)
{
ca = base.VisitColumnAssignment(ca);
Expression e = ca.Expression;
NamedValueExpression expression2 = e as NamedValueExpression;
if (expression2 != null)
{
e = new NamedValueExpression(expression2.Name, ca.Column.QueryType, expression2.Value);
}
return(base.UpdateColumnAssignment(ca, ca.Column, e));
}
