// effects: try to find setter expression for the given member
// requires: command tree must be an insert or update tree (since other DML trees hnabve
private static bool TryGetSetterExpression(
DbModificationCommandTree tree, EdmMember member, ModificationOperator op, out DbSetClause setter)
{
Debug.Assert(op == ModificationOperator.Insert || op == ModificationOperator.Update, "only inserts and updates have setters");
IEnumerable<DbModificationClause> clauses;
if (ModificationOperator.Insert == op)
{
clauses = ((DbInsertCommandTree)tree).SetClauses;
}
else
{
clauses = ((DbUpdateCommandTree)tree).SetClauses;
}
foreach (DbSetClause setClause in clauses)
{
// check if this is the correct setter
if (((DbPropertyExpression)setClause.Property).Property.EdmEquals(member))
{
setter = setClause;
return true;
}
}
// no match found
setter = null;
return false;
}
/// <summary>
/// Gets DB command definition encapsulating store logic for this command.
/// </summary>
protected virtual DbCommand CreateCommand(Dictionary<int, object> identifierValues)
{
var commandTree = _modificationCommandTree;
// check if any server gen identifiers need to be set
if (null != _inputIdentifiers)
{
var modifiedClauses = new Dictionary<DbSetClause, DbSetClause>();
for (var idx = 0; idx < _inputIdentifiers.Count; idx++)
{
var inputIdentifier = _inputIdentifiers[idx];
object value;
if (identifierValues.TryGetValue(inputIdentifier.Key, out value))
{
// reset the value of the identifier
var newClause = new DbSetClause(inputIdentifier.Value.Property, DbExpressionBuilder.Constant(value));
modifiedClauses[inputIdentifier.Value] = newClause;
_inputIdentifiers[idx] = new KeyValuePair<int, DbSetClause>(inputIdentifier.Key, newClause);
}
}
commandTree = RebuildCommandTree(commandTree, modifiedClauses);
}
return Translator.CreateCommand(commandTree);
}
protected virtual void VisitSetClause(DbSetClause setClause)
{
Contract.Requires(setClause != null);
VisitExpression(setClause.Property);
VisitExpression(setClause.Value);
}
/// <summary>Implements the visitor pattern for the set clause.</summary>
/// <param name="setClause">The set clause.</param>
protected virtual void VisitSetClause(DbSetClause setClause)
{
Check.NotNull(setClause, "setClause");
VisitExpression(setClause.Property);
VisitExpression(setClause.Value);
}
/// <summary>Implements the visitor pattern for the set clause.</summary>
/// <param name="setClause">The set clause.</param>
protected virtual void VisitSetClause(DbSetClause setClause)
{
Check.NotNull <DbSetClause>(setClause, nameof(setClause));
this.VisitExpression(setClause.Property);
this.VisitExpression(setClause.Value);
}
/// <summary>Implements the visitor pattern for the set clause.</summary>
/// <param name="setClause">The set clause.</param>
protected virtual void VisitSetClause(DbSetClause setClause)
{
Check.NotNull(setClause, "setClause");
VisitExpression(setClause.Property);
VisitExpression(setClause.Value);
}