protected virtual bool CompareUpdate(UpdateExpression a, UpdateExpression b)
{
return(a.Table == b.Table &&
CompareList(a.Assigments, b.Assigments, CompareAssigment) &&
Compare(a.Source, b.Source) &&
Compare(a.Where, b.Where));
}
protected internal override Expression VisitUpdate(UpdateExpression update)
{
sb.Append("UPDATE ");
sb.Append(update.Name.ToString());
sb.Append(" SET");
this.AppendNewLine(Indentation.Inner);
for (int i = 0, n = update.Assigments.Count; i < n; i++)
{
ColumnAssignment assignment = update.Assigments[i];
if (i > 0)
{
sb.Append(",");
this.AppendNewLine(Indentation.Same);
}
sb.Append(assignment.Column.SqlEscape());
sb.Append(" = ");
this.Visit(assignment.Expression);
}
this.AppendNewLine(Indentation.Outer);
sb.Append("FROM ");
VisitSource(update.Source);
if (update.Where != null)
{
this.AppendNewLine(Indentation.Same);
sb.Append("WHERE ");
Visit(update.Where);
}
return(update);
}
protected virtual bool CompareUpdate(UpdateExpression a, UpdateExpression b)
{
return(a.Table == b.Table &&
a.UseHistoryTable == b.UseHistoryTable &&
CompareList(a.Assigments, b.Assigments, CompareAssigment) &&
Compare(a.Source, b.Source) &&
Compare(a.Where, b.Where) &&
a.ReturnRowCount == b.ReturnRowCount);
}
protected internal override Expression VisitUpdate(UpdateExpression update)
{
if (update.ReturnRowCount == false)
{
return(update);
}
return(new UpdateExpression(update.Table, update.UseHistoryTable, update.Source, update.Where, update.Assigments, returnRowCount: false));
}
protected internal override Expression VisitUpdate(UpdateExpression update)
{
var where = Visit(update.Where);
var assigments = Visit(update.Assigments, VisitColumnAssigment);
var source = Visit(update.Source);
if (source != update.Source || where != update.Where || assigments != update.Assigments)
{
return(new UpdateExpression(update.Table, update.UseHistoryTable, (SourceWithAliasExpression)source, where, assigments));
}
return(update);
}
protected internal override Expression VisitUpdate(UpdateExpression update)
{
var source = Visit(update.Source);
var where = Visit(update.Where);
var assigments = Visit(update.Assigments, c =>
{
var exp = MakeSqlValue(Visit(c.Expression));
if (exp != c.Expression)
{
return(new ColumnAssignment(c.Column, exp));
}
return(c);
});
if (source != update.Source || where != update.Where || assigments != update.Assigments)
{
return(new UpdateExpression(update.Table, update.UseHistoryTable, (SelectExpression)source, where, assigments));
}
return(update);
}
protected internal override Expression VisitUpdate(UpdateExpression update)
{
var coll = GetColumnCollector(update.Source.KnownAliases);
coll.Visit(update.Where);
foreach (var ca in update.Assigments)
{
coll.Visit(ca.Expression);
}
var source = Visit(update.Source);
var where = Visit(update.Where);
var assigments = Visit(update.Assigments, VisitColumnAssigment);
if (source != update.Source || where != update.Where || assigments != update.Assigments)
{
return(new UpdateExpression(update.Table, update.UseHistoryTable, (SourceWithAliasExpression)source, where, assigments));
}
return(update);
}
