protected virtual Expression VisitUpdate(DbUpdateExpression update)
{
DbTableExpression table = (DbTableExpression)Visit(update.Table);
Expression where = Visit(update.Where);
ReadOnlyCollection <DbColumnAssignment> assignments =
VisitColumnAssignments(update.Assignments);
return(UpdateUpdate(update, table, where, assignments));
}
protected DbUpdateExpression UpdateUpdate(DbUpdateExpression update,
DbTableExpression table, Expression where, IEnumerable <DbColumnAssignment> assignments)
{
if (table != update.Table || where != update.Where ||
assignments != update.Assignments)
{
return(new DbUpdateExpression(table, where, assignments));
}
return(update);
}
protected DbUpdateExpression UpdateUpdate(DbUpdateExpression update,
DbTableExpression table, Expression where, IEnumerable<DbColumnAssignment> assignments)
{
if (table != update.Table || where != update.Where ||
assignments != update.Assignments)
return new DbUpdateExpression(table, where, assignments);
return update;
}
protected virtual Expression VisitUpdate(DbUpdateExpression update)
{
DbTableExpression table = (DbTableExpression)Visit(update.Table);
Expression where = Visit(update.Where);
ReadOnlyCollection<DbColumnAssignment> assignments =
VisitColumnAssignments(update.Assignments);
return UpdateUpdate(update, table, where, assignments);
}
protected virtual bool CompareUpdate(DbUpdateExpression x, DbUpdateExpression y)
{
return(Compare(x.Table, y.Table) && Compare(x.Where, y.Where) &&
CompareColumnAssignments(x.Assignments, y.Assignments));
}
protected override Expression VisitUpdate(DbUpdateExpression update)
{
return(this.BuildExecuteCommand(update));
}
protected override Expression VisitUpdate(DbUpdateExpression update)
{
this.Write("UPDATE ");
this.WriteTableName(update.Table.Name);
this.WriteLine(Indentation.Same);
bool saveHide = this.HideColumnAliases;
this.HideColumnAliases = true;
this.Write("SET ");
for (int i = 0, n = update.Assignments.Count; i < n; i++)
{
DbColumnAssignment ca = update.Assignments[i];
if (i > 0) this.Write(", ");
this.Visit(ca.Column);
this.Write(" = ");
this.Visit(ca.Expression);
}
if (update.Where != null)
{
this.WriteLine(Indentation.Same);
this.Write("WHERE ");
this.Visit(update.Where);
}
this.HideColumnAliases = saveHide;
return update;
}
protected virtual bool CompareUpdate(DbUpdateExpression x, DbUpdateExpression y)
{
return Compare(x.Table, y.Table) && Compare(x.Where, y.Where) &&
CompareColumnAssignments(x.Assignments, y.Assignments);
}
