internal DynamicUpdateCommand(TableChangeProcessor processor, UpdateTranslator translator, ModificationOperator op,
PropagatorResult originalValues, PropagatorResult currentValues, DbModificationCommandTree tree,
Dictionary<int, string> outputIdentifiers)
: base(originalValues, currentValues)
{
m_processor = EntityUtil.CheckArgumentNull(processor, "processor");
m_operator = op;
m_modificationCommandTree = EntityUtil.CheckArgumentNull(tree, "commandTree");
m_outputIdentifiers = outputIdentifiers; // may be null (not all commands have output identifiers)
// initialize identifier information (supports lateral propagation of server gen values)
if (ModificationOperator.Insert == op || ModificationOperator.Update == op)
{
const int capacity = 2; // "average" number of identifiers per row
m_inputIdentifiers = new List<KeyValuePair<int ,DbSetClause>>(capacity);
foreach (KeyValuePair<EdmMember, PropagatorResult> member in
Helper.PairEnumerations(TypeHelpers.GetAllStructuralMembers(this.CurrentValues.StructuralType),
this.CurrentValues.GetMemberValues()))
{
DbSetClause setter;
int identifier = member.Value.Identifier;
if (PropagatorResult.NullIdentifier != identifier &&
TryGetSetterExpression(tree, member.Key, op, out setter)) // can find corresponding setter
{
foreach (int principal in translator.KeyManager.GetPrincipals(identifier))
{
m_inputIdentifiers.Add(new KeyValuePair<int, DbSetClause>(principal, setter));
}
}
}
}
}
/// <summary>
/// Builds insert command.
/// </summary>
/// <param name="newRow">Row to insert.</param>
/// <param name="processor">Context for the table we're inserting into.</param>
/// <returns>Insert command.</returns>
internal UpdateCommand BuildInsertCommand(PropagatorResult newRow, TableChangeProcessor processor)
{
// Bind the insert target
DbExpressionBinding target = GetTarget(processor);
// Create set clauses and returning parameter
Dictionary <int, string> outputIdentifiers;
DbExpression returning;
bool rowMustBeTouched = true; // for inserts, the row must always be touched
List <DbModificationClause> setClauses = new List <DbModificationClause>();
foreach (DbModificationClause clause in BuildSetClauses(target, newRow, null, processor, /* insertMode */ true, out outputIdentifiers,
out returning, ref rowMustBeTouched))
{
setClauses.Add(clause);
}
// Initialize DML command tree
DbInsertCommandTree commandTree =
new DbInsertCommandTree(m_translator.MetadataWorkspace, DataSpace.SSpace, target, setClauses.AsReadOnly(), returning);
// Create command
UpdateCommand command = new DynamicUpdateCommand(processor, m_translator, ModificationOperator.Insert, null, newRow, commandTree, outputIdentifiers);
return(command);
}
// Effects: initializes the target (table being modified) for the given DML command tree according
// to the table managed by the processor.
// Requires: all arguments set
private static DbExpressionBinding GetTarget(TableChangeProcessor processor)
{
Debug.Assert(null != processor);
// use a fixed var name since the command trees all have exactly one binding
return(processor.Table.Scan().BindAs(s_targetVarName));
}
internal DynamicUpdateCommand(TableChangeProcessor processor, UpdateTranslator translator, ModificationOperator op,
PropagatorResult originalValues, PropagatorResult currentValues, DbModificationCommandTree tree,
Dictionary <int, string> outputIdentifiers)
: base(originalValues, currentValues)
{
m_processor = EntityUtil.CheckArgumentNull(processor, "processor");
m_operator = op;
m_modificationCommandTree = EntityUtil.CheckArgumentNull(tree, "commandTree");
m_outputIdentifiers = outputIdentifiers; // may be null (not all commands have output identifiers)
// initialize identifier information (supports lateral propagation of server gen values)
if (ModificationOperator.Insert == op || ModificationOperator.Update == op)
{
const int capacity = 2; // "average" number of identifiers per row
m_inputIdentifiers = new List <KeyValuePair <int, DbSetClause> >(capacity);
foreach (KeyValuePair <EdmMember, PropagatorResult> member in
Helper.PairEnumerations(TypeHelpers.GetAllStructuralMembers(this.CurrentValues.StructuralType),
this.CurrentValues.GetMemberValues()))
{
DbSetClause setter;
int identifier = member.Value.Identifier;
if (PropagatorResult.NullIdentifier != identifier &&
TryGetSetterExpression(tree, member.Key, op, out setter)) // can find corresponding setter
{
foreach (int principal in translator.KeyManager.GetPrincipals(identifier))
{
m_inputIdentifiers.Add(new KeyValuePair <int, DbSetClause>(principal, setter));
}
}
}
}
}
/// <summary>
/// Builds an update command.
/// </summary>
/// <param name="oldRow">Old value of the row being updated.</param>
/// <param name="newRow">New value for the row being updated.</param>
/// <param name="processor">Context for the table containing row.</param>
/// <returns>Update command.</returns>
internal UpdateCommand BuildUpdateCommand(
PropagatorResult oldRow,
PropagatorResult newRow, TableChangeProcessor processor)
{
// If we're updating a row, the row may not need to be touched (e.g., no concurrency validation required)
var rowMustBeTouched = false;
var target = GetTarget(processor);
// Create set clauses and returning parameter
Dictionary<int, string> outputIdentifiers;
DbExpression returning;
var setClauses = new List<DbModificationClause>();
foreach (var clause in BuildSetClauses(
target, newRow, oldRow, processor, /* insertMode */ false, out outputIdentifiers, out returning,
ref rowMustBeTouched))
{
setClauses.Add(clause);
}
// Construct predicate identifying the row to modify
var predicate = BuildPredicate(target, oldRow, newRow, processor, ref rowMustBeTouched);
if (0 == setClauses.Count)
{
if (rowMustBeTouched)
{
var stateEntries = new List<IEntityStateEntry>();
stateEntries.AddRange(
SourceInterpreter.GetAllStateEntries(
oldRow, m_translator, processor.Table));
stateEntries.AddRange(
SourceInterpreter.GetAllStateEntries(
newRow, m_translator, processor.Table));
if (stateEntries.All(it => (it.State == EntityState.Unchanged)))
{
rowMustBeTouched = false;
}
}
// Determine if there is nothing to do (i.e., no values to set,
// no computed columns, and no concurrency validation required)
if (!rowMustBeTouched)
{
return null;
}
}
// Initialize DML command tree
var commandTree =
new DbUpdateCommandTree(
m_translator.MetadataWorkspace, DataSpace.SSpace, target, predicate, setClauses.AsReadOnly(), returning);
// Create command
UpdateCommand command = new DynamicUpdateCommand(
processor, m_translator, ModificationOperator.Update, oldRow, newRow, commandTree, outputIdentifiers);
return command;
}
/// <summary>
/// Builds an update command.
/// </summary>
/// <param name="oldRow">Old value of the row being updated.</param>
/// <param name="newRow">New value for the row being updated.</param>
/// <param name="processor">Context for the table containing row.</param>
/// <returns>Update command.</returns>
internal UpdateCommand BuildUpdateCommand(PropagatorResult oldRow,
PropagatorResult newRow, TableChangeProcessor processor)
{
// If we're updating a row, the row may not need to be touched (e.g., no concurrency validation required)
bool rowMustBeTouched = false;
DbExpressionBinding target = GetTarget(processor);
// Create set clauses and returning parameter
Dictionary <int, string> outputIdentifiers;
DbExpression returning;
List <DbModificationClause> setClauses = new List <DbModificationClause>();
foreach (DbModificationClause clause in BuildSetClauses(
target, newRow, oldRow, processor, /* insertMode */ false, out outputIdentifiers, out returning,
ref rowMustBeTouched))
{
setClauses.Add(clause);
}
// Construct predicate identifying the row to modify
DbExpression predicate = BuildPredicate(target, oldRow, newRow, processor, ref rowMustBeTouched);
if (0 == setClauses.Count)
{
if (rowMustBeTouched)
{
List <IEntityStateEntry> stateEntries = new List <IEntityStateEntry>();
stateEntries.AddRange(SourceInterpreter.GetAllStateEntries(
oldRow, m_translator, processor.Table));
stateEntries.AddRange(SourceInterpreter.GetAllStateEntries(
newRow, m_translator, processor.Table));
if (stateEntries.All(it => (it.State == EntityState.Unchanged)))
{
rowMustBeTouched = false;
}
}
// Determine if there is nothing to do (i.e., no values to set,
// no computed columns, and no concurrency validation required)
if (!rowMustBeTouched)
{
return(null);
}
}
// Initialize DML command tree
DbUpdateCommandTree commandTree =
new DbUpdateCommandTree(m_translator.MetadataWorkspace, DataSpace.SSpace, target, predicate, setClauses.AsReadOnly(), returning);
// Create command
UpdateCommand command = new DynamicUpdateCommand(processor, m_translator, ModificationOperator.Update, oldRow, newRow, commandTree, outputIdentifiers);
return(command);
}
/// <summary>
/// Determines predicate used to identify a row in a table.
/// </summary>
/// <remarks>
/// Columns are included in the list when:
/// <list>
/// <item>They are keys for the table</item>
/// <item>They are concurrency values</item>
/// </list>
/// </remarks>
/// <param name="target">Expression binding representing the table containing the row</param>
/// <param name="referenceRow">Values for the row being located.</param>
/// <param name="current">Values being updated (may be null).</param>
/// <param name="processor">Context for the table containing the row.</param>
/// <param name="rowMustBeTouched">Output parameter indicating whether a row must be touched
/// (whether it's being modified or not) because it contains a concurrency value</param>
/// <returns>Column/value pairs.</returns>
private DbExpression BuildPredicate(DbExpressionBinding target, PropagatorResult referenceRow, PropagatorResult current,
TableChangeProcessor processor, ref bool rowMustBeTouched)
{
Dictionary <EdmProperty, PropagatorResult> whereClauses = new Dictionary <EdmProperty, PropagatorResult>();
// add all concurrency tokens (note that keys are always concurrency tokens as well)
int propertyOrdinal = 0;
foreach (EdmProperty member in processor.Table.ElementType.Properties)
{
// members and result values are ordinally aligned
PropagatorResult expectedValue = referenceRow.GetMemberValue(propertyOrdinal);
PropagatorResult newValue = null == current ? null : current.GetMemberValue(propertyOrdinal);
// check if the rowMustBeTouched value should be set to true (if it isn't already
// true and we've come across a concurrency value)
if (!rowMustBeTouched &&
(HasFlag(expectedValue, PropagatorFlags.ConcurrencyValue) ||
HasFlag(newValue, PropagatorFlags.ConcurrencyValue)))
{
rowMustBeTouched = true;
}
// determine if this is a concurrency value
if (!whereClauses.ContainsKey(member) && // don't add to the set clause twice
(HasFlag(expectedValue, PropagatorFlags.ConcurrencyValue | PropagatorFlags.Key) ||
HasFlag(newValue, PropagatorFlags.ConcurrencyValue | PropagatorFlags.Key))) // tagged as concurrency value
{
whereClauses.Add(member, expectedValue);
}
propertyOrdinal++;
}
// Build a binary AND expression tree from the clauses
DbExpression predicate = null;
foreach (KeyValuePair <EdmProperty, PropagatorResult> clause in whereClauses)
{
DbExpression clauseExpression = GenerateEqualityExpression(target, clause.Key, clause.Value);
if (null == predicate)
{
predicate = clauseExpression;
}
else
{
predicate = predicate.And(clauseExpression);
}
}
Debug.Assert(null != predicate, "some predicate term must exist");
return(predicate);
}
/// <summary>
/// Builds a delete command.
/// </summary>
/// <param name="oldRow">Value of the row being deleted.</param>
/// <param name="processor">Context for the table containing row.</param>
/// <returns>Delete command.</returns>
internal UpdateCommand BuildDeleteCommand(PropagatorResult oldRow, TableChangeProcessor processor)
{
// If we're deleting a row, the row must always be touched
bool rowMustBeTouched = true;
// Initialize DML command tree
DbExpressionBinding target = GetTarget(processor);
// Create delete predicate
DbExpression predicate = BuildPredicate(target, oldRow, null, processor, ref rowMustBeTouched);
DbDeleteCommandTree commandTree = new DbDeleteCommandTree(m_translator.MetadataWorkspace, DataSpace.SSpace, target, predicate);
// Set command
// Initialize delete command
UpdateCommand command = new DynamicUpdateCommand(processor, m_translator, ModificationOperator.Delete, oldRow, null, commandTree, null);
return command;
}
/// <summary>
/// Builds a delete command.
/// </summary>
/// <param name="oldRow">Value of the row being deleted.</param>
/// <param name="processor">Context for the table containing row.</param>
/// <returns>Delete command.</returns>
internal UpdateCommand BuildDeleteCommand(PropagatorResult oldRow, TableChangeProcessor processor)
{
// If we're deleting a row, the row must always be touched
bool rowMustBeTouched = true;
// Initialize DML command tree
DbExpressionBinding target = GetTarget(processor);
// Create delete predicate
DbExpression predicate = BuildPredicate(target, oldRow, null, processor, ref rowMustBeTouched);
DbDeleteCommandTree commandTree = new DbDeleteCommandTree(m_translator.MetadataWorkspace, DataSpace.SSpace, target, predicate);
// Set command
// Initialize delete command
UpdateCommand command = new DynamicUpdateCommand(processor, m_translator, ModificationOperator.Delete, oldRow, null, commandTree, null);
return(command);
}
internal DynamicUpdateCommand(
TableChangeProcessor processor, UpdateTranslator translator,
ModificationOperator modificationOperator, PropagatorResult originalValues, PropagatorResult currentValues,
DbModificationCommandTree tree, Dictionary<int, string> outputIdentifiers)
: base(translator, originalValues, currentValues)
{
//Contract.Requires(processor != null);
//Contract.Requires(translator != null);
//Contract.Requires(tree != null);
_processor = processor;
_operator = modificationOperator;
_modificationCommandTree = tree;
_outputIdentifiers = outputIdentifiers; // may be null (not all commands have output identifiers)
// initialize identifier information (supports lateral propagation of server gen values)
if (ModificationOperator.Insert == modificationOperator
|| ModificationOperator.Update == modificationOperator)
{
const int capacity = 2; // "average" number of identifiers per row
_inputIdentifiers = new List<KeyValuePair<int, DbSetClause>>(capacity);
foreach (var member in
Helper.PairEnumerations(
TypeHelpers.GetAllStructuralMembers(CurrentValues.StructuralType),
CurrentValues.GetMemberValues()))
{
DbSetClause setter;
var identifier = member.Value.Identifier;
if (PropagatorResult.NullIdentifier != identifier
&&
TryGetSetterExpression(tree, member.Key, modificationOperator, out setter)) // can find corresponding setter
{
foreach (var principal in translator.KeyManager.GetPrincipals(identifier))
{
_inputIdentifiers.Add(new KeyValuePair<int, DbSetClause>(principal, setter));
}
}
}
}
}
// Effects: initializes the target (table being modified) for the given DML command tree according
// to the table managed by the processor.
// Requires: all arguments set
private static DbExpressionBinding GetTarget(TableChangeProcessor processor)
{
Debug.Assert(null != processor);
// use a fixed var name since the command trees all have exactly one binding
return processor.Table.Scan().BindAs(s_targetVarName);
}
/// <summary>
/// Determines predicate used to identify a row in a table.
/// </summary>
/// <remarks>
/// Columns are included in the list when:
/// <list>
/// <item>They are keys for the table</item>
/// <item>They are concurrency values</item>
/// </list>
/// </remarks>
/// <param name="target">Expression binding representing the table containing the row</param>
/// <param name="referenceRow">Values for the row being located.</param>
/// <param name="current">Values being updated (may be null).</param>
/// <param name="processor">Context for the table containing the row.</param>
/// <param name="rowMustBeTouched">Output parameter indicating whether a row must be touched
/// (whether it's being modified or not) because it contains a concurrency value</param>
/// <returns>Column/value pairs.</returns>
private DbExpression BuildPredicate(DbExpressionBinding target, PropagatorResult referenceRow, PropagatorResult current,
TableChangeProcessor processor, ref bool rowMustBeTouched)
{
Dictionary<EdmProperty, PropagatorResult> whereClauses = new Dictionary<EdmProperty, PropagatorResult>();
// add all concurrency tokens (note that keys are always concurrency tokens as well)
int propertyOrdinal = 0;
foreach (EdmProperty member in processor.Table.ElementType.Properties)
{
// members and result values are ordinally aligned
PropagatorResult expectedValue = referenceRow.GetMemberValue(propertyOrdinal);
PropagatorResult newValue = null == current ? null : current.GetMemberValue(propertyOrdinal);
// check if the rowMustBeTouched value should be set to true (if it isn't already
// true and we've come across a concurrency value)
if (!rowMustBeTouched &&
(HasFlag(expectedValue, PropagatorFlags.ConcurrencyValue) ||
HasFlag(newValue, PropagatorFlags.ConcurrencyValue)))
{
rowMustBeTouched = true;
}
// determine if this is a concurrency value
if (!whereClauses.ContainsKey(member) && // don't add to the set clause twice
(HasFlag(expectedValue, PropagatorFlags.ConcurrencyValue | PropagatorFlags.Key) ||
HasFlag(newValue, PropagatorFlags.ConcurrencyValue | PropagatorFlags.Key))) // tagged as concurrency value
{
whereClauses.Add(member, expectedValue);
}
propertyOrdinal++;
}
// Build a binary AND expression tree from the clauses
DbExpression predicate = null;
foreach (KeyValuePair<EdmProperty, PropagatorResult> clause in whereClauses)
{
DbExpression clauseExpression = GenerateEqualityExpression(target, clause.Key, clause.Value);
if (null == predicate) { predicate = clauseExpression; }
else { predicate = predicate.And(clauseExpression); }
}
Debug.Assert(null != predicate, "some predicate term must exist");
return predicate;
}
/// <summary>
/// Determines column/value used to set values for a row.
/// </summary>
/// <remarks>
/// The following columns are not included in the result:
/// <list>
/// <item>Keys in non-insert operations (keys are only set for inserts).</item>
/// <item>Values flagged 'preserve' (these are values the propagator claims are untouched).</item>
/// <item>Server generated values.</item>
/// </list>
/// </remarks>
/// <param name="target">Expression binding representing the table.</param>
/// <param name="row">Row containing values to set.</param>
/// <param name="processor">Context for table.</param>
/// <param name="insertMode">Determines whether key columns and 'preserve' columns are
/// omitted from the list.</param>
/// <param name="outputIdentifiers">Dictionary listing server generated identifiers.</param>
/// <param name="returning">DbExpression describing result projection for server generated values.</param>
/// <param name="rowMustBeTouched">Indicates whether the row must be touched
/// because it produces a value (e.g. computed)</param>
/// <returns>Column value pairs.</returns>
private IEnumerable<DbModificationClause> BuildSetClauses(DbExpressionBinding target, PropagatorResult row,
PropagatorResult originalRow, TableChangeProcessor processor, bool insertMode, out Dictionary<int, string> outputIdentifiers, out DbExpression returning,
ref bool rowMustBeTouched)
{
Dictionary<EdmProperty, PropagatorResult> setClauses = new Dictionary<EdmProperty, PropagatorResult>();
List<KeyValuePair<string, DbExpression>> returningArguments = new List<KeyValuePair<string, DbExpression>>();
outputIdentifiers = new Dictionary<int, string>();
// Determine which flags indicate a property should be omitted from the set list.
PropagatorFlags omitMask = insertMode ? PropagatorFlags.NoFlags :
PropagatorFlags.Preserve | PropagatorFlags.Unknown;
for (int propertyOrdinal = 0; propertyOrdinal < processor.Table.ElementType.Properties.Count; propertyOrdinal++)
{
EdmProperty property = processor.Table.ElementType.Properties[propertyOrdinal];
// Type members and result values are ordinally aligned
PropagatorResult propertyResult = row.GetMemberValue(propertyOrdinal);
if (PropagatorResult.NullIdentifier != propertyResult.Identifier)
{
// retrieve principal value
propertyResult = propertyResult.ReplicateResultWithNewValue(
m_translator.KeyManager.GetPrincipalValue(propertyResult));
}
bool omitFromSetList = false;
Debug.Assert(propertyResult.IsSimple);
// Determine if this is a key value
bool isKey = false;
for (int i = 0; i < processor.KeyOrdinals.Length; i++)
{
if (processor.KeyOrdinals[i] == propertyOrdinal)
{
isKey = true;
break;
}
}
// check if this value should be omitted
PropagatorFlags flags = PropagatorFlags.NoFlags;
if (!insertMode && isKey)
{
// Keys are only set for inserts
omitFromSetList = true;
}
else
{
// See if this value has been marked up with some context. If so, add the flag information
// from the markup. Markup includes information about whether the property is a concurrency value,
// whether it is known (it may be a property that is preserved across an update for instance)
flags |= propertyResult.PropagatorFlags;
}
// Determine if this value is server-generated
StoreGeneratedPattern genPattern = MetadataHelper.GetStoreGeneratedPattern(property);
bool isServerGen = genPattern == StoreGeneratedPattern.Computed ||
(insertMode && genPattern == StoreGeneratedPattern.Identity);
if (isServerGen)
{
DbPropertyExpression propertyExpression = target.Variable.Property(property);
returningArguments.Add(new KeyValuePair<string, DbExpression>(property.Name, propertyExpression));
// check if this is a server generated identifier
int identifier = propertyResult.Identifier;
if (PropagatorResult.NullIdentifier != identifier)
{
if (m_translator.KeyManager.HasPrincipals(identifier))
{
throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.Update_GeneratedDependent(property.Name));
}
outputIdentifiers.Add(identifier, property.Name);
// If this property maps an identifier (in the update pipeline) it may
// also be a store key. If so, the pattern had better be "Identity"
// since otherwise we're dealing with a mutable key.
if (genPattern != StoreGeneratedPattern.Identity &&
processor.IsKeyProperty(propertyOrdinal))
{
throw EntityUtil.NotSupported(System.Data.Entity.Strings.Update_NotSupportedComputedKeyColumn(
EdmProviderManifest.StoreGeneratedPatternFacetName,
XmlConstants.Computed,
XmlConstants.Identity,
property.Name,
property.DeclaringType.FullName));
}
}
}
if (PropagatorFlags.NoFlags != (flags & (omitMask)))
{
// column value matches "omit" pattern, therefore should not be set
omitFromSetList = true;
}
else if (isServerGen)
{
// column value does not match "omit" pattern, but it is server generated
// so it cannot be set
omitFromSetList = true;
// if the row has a modified value overridden by server gen,
// it must still be touched in order to retrieve the value
rowMustBeTouched = true;
}
// make the user is not updating an identity value
if (!omitFromSetList && !insertMode && genPattern == StoreGeneratedPattern.Identity)
{
//throw the error only if the value actually changed
Debug.Assert(originalRow != null, "Updated records should have a original row");
PropagatorResult originalPropertyResult = originalRow.GetMemberValue(propertyOrdinal);
Debug.Assert(originalPropertyResult.IsSimple, "Server Gen property that is not primitive?");
Debug.Assert(propertyResult.IsSimple, "Server Gen property that is not primitive?");
if (!ByValueEqualityComparer.Default.Equals(originalPropertyResult.GetSimpleValue(), propertyResult.GetSimpleValue()))
{
throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.Update_ModifyingIdentityColumn(
XmlConstants.Identity,
property.Name,
property.DeclaringType.FullName));
}
else
{
omitFromSetList = true;
}
}
if (!omitFromSetList) { setClauses.Add(property, propertyResult); }
}
// Construct returning projection
if (0 < returningArguments.Count)
{
returning = DbExpressionBuilder.NewRow(returningArguments);
}
else
{
returning = null;
}
// Construct clauses corresponding to the set clauses
List<DbModificationClause> result = new List<DbModificationClause>(setClauses.Count);
foreach (KeyValuePair<EdmProperty, PropagatorResult> setClause in setClauses)
{
EdmProperty property = setClause.Key;
result.Add(new DbSetClause(
GeneratePropertyExpression(target, setClause.Key),
GenerateValueExpression(setClause.Key, setClause.Value)));
}
return result;
}
/// <summary>
/// Builds insert command.
/// </summary>
/// <param name="newRow">Row to insert.</param>
/// <param name="processor">Context for the table we're inserting into.</param>
/// <returns>Insert command.</returns>
internal UpdateCommand BuildInsertCommand(PropagatorResult newRow, TableChangeProcessor processor)
{
// Bind the insert target
DbExpressionBinding target = GetTarget(processor);
// Create set clauses and returning parameter
Dictionary<int, string> outputIdentifiers;
DbExpression returning;
bool rowMustBeTouched = true; // for inserts, the row must always be touched
List<DbModificationClause> setClauses = new List<DbModificationClause>();
foreach (DbModificationClause clause in BuildSetClauses(target, newRow, null, processor, /* insertMode */ true, out outputIdentifiers,
out returning, ref rowMustBeTouched))
{
setClauses.Add(clause);
}
// Initialize DML command tree
DbInsertCommandTree commandTree =
new DbInsertCommandTree(m_translator.MetadataWorkspace, DataSpace.SSpace, target, setClauses.AsReadOnly(), returning);
// Create command
UpdateCommand command = new DynamicUpdateCommand(processor, m_translator, ModificationOperator.Insert, null, newRow, commandTree, outputIdentifiers);
return command;
}
/// <summary>
/// Produce dynamic store commands for this translator's changes.
/// </summary>
/// <returns>Database commands in a safe order</returns>
private IEnumerable<UpdateCommand> ProduceDynamicCommands()
{
// Initialize DBCommand update compiler
UpdateCompiler updateCompiler = new UpdateCompiler(this);
// Determine affected
Set<EntitySet> tables = new Set<EntitySet>();
foreach (EntitySetBase extent in GetDynamicModifiedExtents())
{
Set<EntitySet> affectedTables = m_viewLoader.GetAffectedTables(extent, m_metadataWorkspace);
//Since these extents don't have Functions defined for update operations,
//the affected tables should be provided via MSL.
//If we dont find any throw an exception
if (affectedTables.Count == 0)
{
throw EntityUtil.Update(System.Data.Entity.Strings.Update_MappingNotFound(
extent.Name), null /*stateEntries*/);
}
foreach (EntitySet table in affectedTables)
{
tables.Add(table);
}
}
// Determine changes to apply to each table
foreach (EntitySet table in tables)
{
DbQueryCommandTree umView = m_connection.GetMetadataWorkspace().GetCqtView(table);
// Propagate changes to root of tree (at which point they are S-Space changes)
ChangeNode changeNode = Propagator.Propagate(this, table, umView);
// Process changes for the table
TableChangeProcessor change = new TableChangeProcessor(table);
foreach (UpdateCommand command in change.CompileCommands(changeNode, updateCompiler))
{
yield return command;
}
}
}
/// <summary>
/// Determines column/value used to set values for a row.
/// </summary>
/// <remarks>
/// The following columns are not included in the result:
/// <list>
/// <item>Keys in non-insert operations (keys are only set for inserts).</item>
/// <item>Values flagged 'preserve' (these are values the propagator claims are untouched).</item>
/// <item>Server generated values.</item>
/// </list>
/// </remarks>
/// <param name="target">Expression binding representing the table.</param>
/// <param name="row">Row containing values to set.</param>
/// <param name="processor">Context for table.</param>
/// <param name="insertMode">Determines whether key columns and 'preserve' columns are
/// omitted from the list.</param>
/// <param name="outputIdentifiers">Dictionary listing server generated identifiers.</param>
/// <param name="returning">DbExpression describing result projection for server generated values.</param>
/// <param name="rowMustBeTouched">Indicates whether the row must be touched
/// because it produces a value (e.g. computed)</param>
/// <returns>Column value pairs.</returns>
private IEnumerable <DbModificationClause> BuildSetClauses(DbExpressionBinding target, PropagatorResult row,
PropagatorResult originalRow, TableChangeProcessor processor, bool insertMode, out Dictionary <int, string> outputIdentifiers, out DbExpression returning,
ref bool rowMustBeTouched)
{
Dictionary <EdmProperty, PropagatorResult> setClauses = new Dictionary <EdmProperty, PropagatorResult>();
List <KeyValuePair <string, DbExpression> > returningArguments = new List <KeyValuePair <string, DbExpression> >();
outputIdentifiers = new Dictionary <int, string>();
// Determine which flags indicate a property should be omitted from the set list.
PropagatorFlags omitMask = insertMode ? PropagatorFlags.NoFlags :
PropagatorFlags.Preserve | PropagatorFlags.Unknown;
for (int propertyOrdinal = 0; propertyOrdinal < processor.Table.ElementType.Properties.Count; propertyOrdinal++)
{
EdmProperty property = processor.Table.ElementType.Properties[propertyOrdinal];
// Type members and result values are ordinally aligned
PropagatorResult propertyResult = row.GetMemberValue(propertyOrdinal);
if (PropagatorResult.NullIdentifier != propertyResult.Identifier)
{
// retrieve principal value
propertyResult = propertyResult.ReplicateResultWithNewValue(
m_translator.KeyManager.GetPrincipalValue(propertyResult));
}
bool omitFromSetList = false;
Debug.Assert(propertyResult.IsSimple);
// Determine if this is a key value
bool isKey = false;
for (int i = 0; i < processor.KeyOrdinals.Length; i++)
{
if (processor.KeyOrdinals[i] == propertyOrdinal)
{
isKey = true;
break;
}
}
// check if this value should be omitted
PropagatorFlags flags = PropagatorFlags.NoFlags;
if (!insertMode && isKey)
{
// Keys are only set for inserts
omitFromSetList = true;
}
else
{
// See if this value has been marked up with some context. If so, add the flag information
// from the markup. Markup includes information about whether the property is a concurrency value,
// whether it is known (it may be a property that is preserved across an update for instance)
flags |= propertyResult.PropagatorFlags;
}
// Determine if this value is server-generated
StoreGeneratedPattern genPattern = MetadataHelper.GetStoreGeneratedPattern(property);
bool isServerGen = genPattern == StoreGeneratedPattern.Computed ||
(insertMode && genPattern == StoreGeneratedPattern.Identity);
if (isServerGen)
{
DbPropertyExpression propertyExpression = target.Variable.Property(property);
returningArguments.Add(new KeyValuePair <string, DbExpression>(property.Name, propertyExpression));
// check if this is a server generated identifier
int identifier = propertyResult.Identifier;
if (PropagatorResult.NullIdentifier != identifier)
{
if (m_translator.KeyManager.HasPrincipals(identifier))
{
throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.Update_GeneratedDependent(property.Name));
}
outputIdentifiers.Add(identifier, property.Name);
// If this property maps an identifier (in the update pipeline) it may
// also be a store key. If so, the pattern had better be "Identity"
// since otherwise we're dealing with a mutable key.
if (genPattern != StoreGeneratedPattern.Identity &&
processor.IsKeyProperty(propertyOrdinal))
{
throw EntityUtil.NotSupported(System.Data.Entity.Strings.Update_NotSupportedComputedKeyColumn(
EdmProviderManifest.StoreGeneratedPatternFacetName,
XmlConstants.Computed,
XmlConstants.Identity,
property.Name,
property.DeclaringType.FullName));
}
}
}
if (PropagatorFlags.NoFlags != (flags & (omitMask)))
{
// column value matches "omit" pattern, therefore should not be set
omitFromSetList = true;
}
else if (isServerGen)
{
// column value does not match "omit" pattern, but it is server generated
// so it cannot be set
omitFromSetList = true;
// if the row has a modified value overridden by server gen,
// it must still be touched in order to retrieve the value
rowMustBeTouched = true;
}
// make the user is not updating an identity value
if (!omitFromSetList && !insertMode && genPattern == StoreGeneratedPattern.Identity)
{
//throw the error only if the value actually changed
Debug.Assert(originalRow != null, "Updated records should have a original row");
PropagatorResult originalPropertyResult = originalRow.GetMemberValue(propertyOrdinal);
Debug.Assert(originalPropertyResult.IsSimple, "Server Gen property that is not primitive?");
Debug.Assert(propertyResult.IsSimple, "Server Gen property that is not primitive?");
if (!ByValueEqualityComparer.Default.Equals(originalPropertyResult.GetSimpleValue(), propertyResult.GetSimpleValue()))
{
throw EntityUtil.InvalidOperation(System.Data.Entity.Strings.Update_ModifyingIdentityColumn(
XmlConstants.Identity,
property.Name,
property.DeclaringType.FullName));
}
else
{
omitFromSetList = true;
}
}
if (!omitFromSetList)
{
setClauses.Add(property, propertyResult);
}
}
// Construct returning projection
if (0 < returningArguments.Count)
{
returning = DbExpressionBuilder.NewRow(returningArguments);
}
else
{
returning = null;
}
// Construct clauses corresponding to the set clauses
List <DbModificationClause> result = new List <DbModificationClause>(setClauses.Count);
foreach (KeyValuePair <EdmProperty, PropagatorResult> setClause in setClauses)
{
EdmProperty property = setClause.Key;
result.Add(new DbSetClause(
GeneratePropertyExpression(target, setClause.Key),
GenerateValueExpression(setClause.Key, setClause.Value)));
}
return(result);
}
