/// <summary>
/// Returns a query that identifies the entity.
/// </summary>
/// <typeparam name="TModel"></typeparam>
/// <param name="entity"></param>
/// <returns></returns>
public static DataModelQuery <TModel> EntityToIdentifyingQuery <TModel>(TModel model) where TModel : DataModel
{
var query = new DataModelQuery <TModel>();
bool pkfound = false;
int pkc = 0;
if (model.EntityMappings.PrimaryKeyColumns.Length > 0)
{
foreach (var field_kvp in model.EntityMappings.FieldMappings)
{
DataModelColumnAttribute field = field_kvp.Value;
if (field.IsPrimaryKey)
{
string memName = field_kvp.Key;
pkfound = (model[memName] != null);
if (pkfound)
{
query.WhereProperty[memName].IsEqualTo(model[memName]);
pkc++;
}
}
}
}
if (!pkfound || model.EntityMappings.PrimaryKeyColumns.Length != pkc)
{
foreach (var field_kvp in model.EntityMappings.FieldMappings)
{
string memName = field_kvp.Key;
query.WhereProperty[memName].IsEqualTo(model[memName]);
}
}
return(query);
}
/// <summary>
/// Loads the full object graph for the
/// <see cref="DataModel"/> objects that are returned from the specified
/// <paramref name="query"/>, within the specified database
/// <paramref name="transactionContext"/>.
/// </summary>
/// <param name="query"></param>
/// <param name="transactionContext"></param>
/// <param name="depth"></param>
/// <param name="loadedModels">
/// Used for keeping recursive loading from resulting
/// in infinite loops. Evaluate each loaded item from
/// a database result set against this collection; if
/// there is a match, use the collection item,
/// otherwise use the database loaded item, deep-load
/// it, and add it to this collection.
/// </param>
/// <returns></returns>
public virtual DataModelCollection <TModel> DeepLoadModels <TModel>(
DataModelQuery <TModel> query, int?depth, DbTransaction transactionContext,
List <DataModel> loadedModels) where TModel : DataModel
{
DataModelCollection <TModel> entities = LoadModels(query);
DataModel e;
bool hasForeignKey = false;
if (entities.Count > 0)
{
e = entities[0];
foreach (var field_kvp in e.EntityMappings.FieldMappings)
{
DataModelColumnAttribute field = field_kvp.Value;
if (field.IsForeignKey)
{
hasForeignKey = true;
break;
}
}
if (!hasForeignKey &&
(e.EntityMappings.ForeignModelMappings == null ||
e.EntityMappings.ForeignModelMappings.Count == 0))
{
return(entities);
}
}
for (int i = 0; i < entities.Count; i++)
{
if (depth == null || depth > 0)
{
TModel entity = entities[i];
if (hasForeignKey && !loadedModels.Contains(entity))
{
foreach (var field_kvp in entity.EntityMappings.FieldMappings)
{
DataModelColumnAttribute field = field_kvp.Value;
if (field.IsForeignKey && field.ForeignKeyMapping.AssignToMember != null)
{
LoadMember(entity, field, field_kvp.Key,
transactionContext, loadedModels);
loadedModels.Add(entity);
}
}
}
if (entity.EntityMappings.ForeignModelMappings != null &&
entity.EntityMappings.ForeignModelMappings.Count > 0
)
{
DataModelQuery <TModel> query2 = EntityToIdentifyingQuery(entity);
entity = (depth == null)
? DeepLoadModel(query2, transactionContext, loadedModels)
: DeepLoadModel(query2, depth - 1, transactionContext, loadedModels);
//loadedModels.Add(entity);
entities[i] = entity;
}
}
}
return(entities);
}
private void LoadMember(
DataModel dataModel,
DataModelColumnAttribute fieldMapping,
string memberName,
DbTransaction transactionContext,
List <DataModel> loadedModels)
{
LoadMember(dataModel, null, fieldMapping, memberName,
transactionContext, loadedModels);
}
/// <summary>
/// Saves the changes that were made to the
/// specified <paramref name="dataModel"/>, within the specified
/// database <paramref name="transactionContext"/>.
/// <remarks>
/// The specified object must have the Deleted property set to true,
/// IsDirty evaluated as true, or IsNew evaluated as true, or else
/// the entity will not be saved.
/// </remarks>
/// </summary>
/// <param name="dataModel"></param>
/// <param name="transactionContext"></param>
public override void SaveModel <TModel>(TModel dataModel, DbTransaction transactionContext)
{
if (!dataModel.IsNew &&
!dataModel.IsDirty &&
!dataModel.MarkDeleted)
{
return;
}
DataModelMap demap = DataModelMap.GetEntityMapping(dataModel.GetType());
DbConnection tmpConn = null;
if (transactionContext == null)
{
tmpConn = CreateAndOpenConnection();
transactionContext = tmpConn.BeginTransaction();
}
try
{
DbDataProviderCommandBuilder <TModel> cmdBuilder = CreateCommandBuilder(dataModel);
using (DbCommand cmd = cmdBuilder.CreateDbCommand(transactionContext))
{
cmd.Transaction = transactionContext;
bool wasNew = dataModel.IsNew;
cmd.ExecuteNonQuery();
if (wasNew)
{
foreach (var field in demap.FieldMappings)
{
DataModelColumnAttribute f = field.Value;
if (f.ReturnAsOutputOnInsert)
{
dataModel[f.TargetMember.Name] = cmd.Parameters[f.InsertParam].Value;
}
}
}
}
}
finally
{
if (tmpConn != null)
{
transactionContext.Commit();
tmpConn.Close();
}
}
}
private void LoadMember(
DataModel dataModel,
int?depth,
DataModelColumnAttribute fieldMapping,
string memberName,
DbTransaction transactionContext,
List <DataModel> loadedModels)
{
DataModelColumnAttribute field = fieldMapping;
DataModel e = dataModel;
ForeignKeyAttribute fkmapping = field.ForeignKeyMapping;
string fMemberName = field.ForeignKeyMapping.AssignToMember;
FieldInfo memField = e.Entity.GetType().GetField(fMemberName);
PropertyInfo memProp = e.Entity.GetType().GetProperty(fMemberName);
Type memberType = memField != null
? memField.FieldType
: memProp.PropertyType;
bool useAssignWrapper = false;
if (!memberType.IsDataModel())
{
useAssignWrapper = true;
}
Type dataMemberType;
dataMemberType = useAssignWrapper
? typeof(DataModel <>).MakeGenericType(memberType)
: memberType;
Type queryType = typeof(DataModelQuery <>).MakeGenericType(dataMemberType);
IDataModelQuery subquery = ((IDataModelQuery)Activator.CreateInstance(queryType))
.WhereProperty[fkmapping.ForeignEntityProperty].IsEqualTo(e[memberName]);
if (depth != null)
{
depth = depth - 1;
}
DataModel subentity = DeepLoadModel(dataMemberType, subquery, depth, transactionContext, loadedModels);
if (useAssignWrapper)
{
memProp.SetValue(
e.Entity, subentity.Entity, new object[] {});
}
else
{
memProp.SetValue(e, subentity, new object[] {});
}
}
private string ValueToExpression(DataModelColumnAttribute fieldMetadata, object value)
{
return(ValueToExpression(fieldMetadata.DbType, value));
}
/// <summary>
/// Returns a generated array of <see cref="DbParameter"/>s
/// that should be passed in with the command.
/// </summary>
/// <returns></returns>
protected virtual DbParameter[] CreateParameters()
{
// add insert/update values
var ret = new List <DbParameter>();
foreach (var colmap_kvp in ModelMap.FieldMappings)
{
string fld = colmap_kvp.Key;
DataModelColumnAttribute colmap = colmap_kvp.Value;
DbParameter param = null;
switch (StatementCommand)
{
case SqlStatement.INSERT:
if (string.IsNullOrEmpty(colmap.InsertParam))
{
continue;
}
if (colmap.IncludeOnInsert ||
colmap.ReturnAsOutputOnInsert)
{
param = Provider.DbFactory.CreateParameter();
param.ParameterName = !colmap.InsertParam.StartsWith("@")
? "@" + colmap.InsertParam
: colmap.InsertParam;
if (colmap.ReturnAsOutputOnInsert)
{
param.Direction = ParameterDirection.Output;
}
}
break;
case SqlStatement.UPDATE:
if (string.IsNullOrEmpty(colmap.UpdateParam))
{
continue;
}
bool add = true;
if (!CommandBuilder.SetAllValues)
{
add = DataModel.ModifiedProperties.Contains(fld);
}
if (add)
{
param = Provider.DbFactory.CreateParameter();
param.ParameterName = !colmap.UpdateParam.StartsWith("@")
? "@" + colmap.UpdateParam
: colmap.UpdateParam;
}
break;
}
if (param != null && ret.Find(p => p.ParameterName == param.ParameterName) == null)
{
if (param is SqlParameter)
{
((SqlParameter)param).SqlDbType = colmap.SqlDbType;
}
else
{
param.DbType = colmap.DbType;
}
if (colmap.ColumnSize.HasValue)
{
param.Value = colmap.ColumnSize.Value;
}
else if (colmap.DataType == typeof(string))
{
param.Size = (DataModel[fld] ?? string.Empty).ToString().Length;
}
if (param.Direction == ParameterDirection.Input ||
param.Direction == ParameterDirection.InputOutput)
{
param.IsNullable = colmap.IsNullable;
param.Value = DataModel[fld] ?? DBNull.Value;
}
ret.Add(param);
}
}
foreach (var foreignMapping_kvp in ModelMap.ForeignModelMappings)
{
ForeignDataModelAttribute foreignMapping = foreignMapping_kvp.Value;
if (foreignMapping.TargetMemberType.IsOrInherits(typeof(IEnumerable)))
{
continue;
}
switch (StatementCommand)
{
case SqlStatement.INSERT:
var fieldValue = DataModel.ColumnMappedValue[foreignMapping.LocalColumn];
var paramName = "@" + foreignMapping.LocalColumn;
if (ret.Find(p => p.ParameterName == paramName) == null)
{
if (ret.Find(p => p.ParameterName == paramName) != null)
{
continue;
}
var param = Provider.DbFactory.CreateParameter();
param.ParameterName = paramName;
if (param is SqlParameter)
{
((SqlParameter)param).SqlDbType = foreignMapping.LocalColumnSqlDbType;
}
else
{
param.DbType = foreignMapping.LocalColumnDbType;
}
if (foreignMapping.LocalColumnSize.HasValue)
{
param.Value = foreignMapping.LocalColumnSize.Value;
}
else if (foreignMapping.TargetMemberType == typeof(string))
{
param.Size = (fieldValue ?? string.Empty).ToString().Length;
}
if (param.Direction == ParameterDirection.Input ||
param.Direction == ParameterDirection.InputOutput)
{
param.IsNullable = foreignMapping.LocalColumnIsNullable;
param.Value = fieldValue ?? DBNull.Value;
}
ret.Add(param);
}
break;
}
}
// add query conditions
if (Query != null)
{
foreach (DataModelQueryCondition <TModel> cond in Query.Conditions)
{
DataModelColumnAttribute fm = cond.FieldMap;
if (fm == null)
{
switch (cond.FindFieldMappingBy)
{
case FieldMappingKeyType.ClrMember:
fm = ModelMap[cond.EvalSubject];
break;
case FieldMappingKeyType.DbColumn:
fm = ModelMap.GetFieldMappingByDbColumnName(cond.EvalSubject);
break;
}
}
string paramName = string.Empty;
if (fm != null)
{
switch (StatementCommand)
{
case SqlStatement.SELECT:
if (string.IsNullOrEmpty(fm.SelectParam))
{
continue;
}
paramName = fm.SelectParam;
break;
case SqlStatement.INSERT:
if (string.IsNullOrEmpty(fm.InsertParam))
{
continue;
}
paramName = fm.InsertParam;
break;
case SqlStatement.UPDATE:
if (string.IsNullOrEmpty(fm.UpdateParam))
{
continue;
}
paramName = fm.UpdateParam;
break;
case SqlStatement.DELETE:
if (string.IsNullOrEmpty(fm.DeleteParam))
{
continue;
}
paramName = fm.DeleteParam;
break;
}
if (ret.Find(p => p.ParameterName == paramName) == null)
{
if (UsesSproc && cond.CompareOp != Compare.Equal)
{
throw new InvalidOperationException(
"Cannot produce an ad hoc WHERE clause with a SQL Stored Procedure.");
}
DbParameter param = Provider.DbFactory.CreateParameter();
param.ParameterName = !paramName.StartsWith("@")
? "@" + paramName
: paramName;
if (param is SqlParameter)
{
((SqlParameter)param).SqlDbType = fm.SqlDbType;
}
else
{
param.DbType = fm.DbType;
}
if (fm.ColumnSize.HasValue)
{
param.Value = fm.ColumnSize.Value;
}
else if (fm.DataType == typeof(string))
{
fm.ColumnSize =
(cond.CompareValue ?? string.Empty).ToString().Length;
}
param.IsNullable = fm.IsNullable;
param.Value = cond.CompareValue ?? DBNull.Value;
ret.Add(param);
}
}
else
{
if (cond.CompareValue != null)
{
paramName = "@" + cond.EvalSubject;
if (ret.Find(p => p.ParameterName == paramName) == null)
{
DbParameter param = Provider.DbFactory.CreateParameter();
param.ParameterName = paramName;
if (param is SqlParameter)
{
((SqlParameter)param).SqlDbType
= DbTypeConverter.ToSqlDbType(cond.CompareValue);
}
else
{
param.DbType = DbTypeConverter.ToDbType(cond.CompareValue);
}
if (cond.CompareValue is string)
{
param.Size = ((string)cond.CompareValue).Length;
}
param.IsNullable = true;
param.Value = cond.CompareValue;
ret.Add(param);
}
}
}
}
}
return(ret.ToArray());
}
/// <summary>
/// When implemented, loads the full object graph for the first
/// <see cref="DataModel"/> that is returned from the specified
/// <paramref name="query"/>, within the specified database
/// <paramref name="transactionContext"/>.
/// </summary>
/// <param name="query"></param>
/// <param name="transactionContext"></param>
/// <param name="depth"></param>
/// <param name="loadedModels">
/// Used for keeping recursive loading from resulting
/// in infinite loops. Evaluate each loaded item from
/// a database result set against this collection; if
/// there is a match, use the collection item,
/// otherwise use the database loaded item, deep-load
/// it, and add it to this collection.
/// </param>
/// <returns></returns>
public virtual TModel DeepLoadModel <TModel>(
DataModelQuery <TModel> query, int?depth, DbTransaction transactionContext,
List <DataModel> loadedModels
) where TModel : DataModel
{
TModel e = LoadModel(query, transactionContext);
if (e == null)
{
return(e);
}
if (loadedModels == null)
{
loadedModels = new List <DataModel>();
}
if (loadedModels.Contains(e))
{
return((TModel)loadedModels[loadedModels.IndexOf(e)]);
}
foreach (DataModel previouslyLoadedModel in loadedModels)
{
if (query.GetType().IsGenericType)
{
Type qt = query.GetType().GetGenericArguments()[0];
if (previouslyLoadedModel.GetType().IsOrInherits(qt) &&
previouslyLoadedModel.Equals(e) &&
previouslyLoadedModel is TModel)
{
return((TModel)previouslyLoadedModel);
}
}
}
if (!loadedModels.Contains(e))
{
loadedModels.Add(e);
}
foreach (var fe_kvp in e.EntityMappings.ForeignModelMappings)
{
if (depth == null || depth > 0)
{
ForeignDataModelAttribute fe = fe_kvp.Value;
Type targetEntityType = fe.TargetMemberType;
while (targetEntityType.IsGenericType &&
targetEntityType.IsOrInherits(typeof(IEnumerable)))
{
targetEntityType = targetEntityType.GetGenericArguments().Last();
}
if (!targetEntityType.IsDataModel())
{
targetEntityType = typeof(DataModel <>).MakeGenericType(targetEntityType);
}
Type subQueryType = typeof(DataModelQuery <>).MakeGenericType(targetEntityType);
Relationship relationship = fe.Relationship;
if (relationship == Relationship.ManyToMany &&
string.IsNullOrEmpty(fe.MappingTable))
{
relationship = Relationship.OneToMany;
}
switch (relationship)
{
case Relationship.OneToOne:
case Relationship.ManyToOne:
IDataModelQuery subQuery = ((IDataModelQuery)Activator.CreateInstance(subQueryType))
.WhereColumn[fe.RelatedTableColumn].IsEqualTo(
e.ColumnMappedValue[fe.LocalColumn]);
DataModel e2 = DeepLoadModel(targetEntityType, subQuery,
depth == null ? null : depth - 1,
transactionContext, loadedModels);
object e2o = e2;
if (!fe.TargetMemberType.IsDataModel())
{
e2o = (e2).Entity;
}
if (fe.TargetMember.MemberType == MemberTypes.Field)
{
((FieldInfo)fe.TargetMember).SetValue(e.Entity, e2o);
}
else if (fe.TargetMember.MemberType == MemberTypes.Property)
{
((PropertyInfo)fe.TargetMember).SetValue(e.Entity, e2o, new object[] {});
}
break;
case Relationship.OneToMany:
IDataModelQuery subQuery2 = ((IDataModelQuery)Activator.CreateInstance(subQueryType))
.WhereColumn[fe.RelatedTableColumn].IsEqualTo(
e.ColumnMappedValue[fe.LocalColumn]);
IDataModelCollection e2c = DeepLoadModels(targetEntityType, subQuery2, depth,
transactionContext, loadedModels);
object e2ct = Activator.CreateInstance(fe.TargetMemberType);
if (e2ct is IList)
{
bool de = fe.TargetMemberType.IsGenericType &&
fe.TargetMemberType.GetGenericArguments().Last().IsDataModel();
foreach (object e2cx in e2c)
{
if (de)
{
((IList)e2ct).Add(e2cx);
}
else
{
object e2cx2 = ((DataModel)e2cx).Entity;
((IList)e2ct).Add(e2cx2);
}
}
}
else
{
e2ct = ((IList)e2c)[0];
}
if (fe.TargetMember.MemberType == MemberTypes.Field)
{
((FieldInfo)fe.TargetMember).SetValue(e.Entity, e2ct);
}
else if (fe.TargetMember.MemberType == MemberTypes.Property)
{
((PropertyInfo)fe.TargetMember).SetValue(e.Entity, e2ct, new object[] {});
}
break;
case Relationship.ManyToMany:
if (!fe.TargetMemberType.IsOrInherits(typeof(IList)))
{
throw new InvalidCastException(
"Cannot apply ManyToMany binding to a non-IList property.");
}
Type tleft = fe.DeclaringType;
Type tleftEntity = tleft;
while (tleftEntity.IsDataModelWrapper(true))
{
if (tleftEntity.BaseType != (typeof(DataModel <>)).BaseType)
{
tleftEntity = tleftEntity.BaseType;
}
else
{
tleftEntity = tleftEntity.GetGenericArguments()[0];
}
}
Type tright = (fe.TargetMemberType.IsGenericType &&
!fe.TargetMemberType.IsDataModel() &&
fe.TargetMemberType.IsOrInherits(typeof(IList)))
? fe.TargetMemberType.GetGenericArguments()[0]
:
fe.TargetMemberType;
Type trightEntity = tright;
if (!tright.IsDataModel())
{
tright = typeof(DataModel <>).MakeGenericType(tright);
}
Type mapType = typeof(DataModelMap.RuntimeMappingTable <,>)
.MakeGenericType(
// left side of mapping table
fe.TargetMember.DeclaringType,
// right side
tright);
var mapObj = (DataModel)Activator.CreateInstance(mapType);
mapObj.EntityMappings.TableMapping.Schema = fe.MappingTableSchema ??
ProviderDefaults.DefaultSchema;
mapObj.EntityMappings.TableMapping.Table = fe.MappingTable ??
(string.Compare(trightEntity.Name,
tleftEntity.Name) == -1
? trightEntity.Name +
tleftEntity.Name
: tleftEntity.Name +
trightEntity.Name);
DataModelColumnAttribute mapLeftCol = mapObj.EntityMappings.FieldMappings["LeftColumn"];
mapLeftCol.ColumnName = fe.LocalColumn;
mapLeftCol.DbType = e.EntityMappings
.GetFieldMappingByDbColumnName(fe.LocalColumn).DbType;
mapLeftCol.TargetMemberType = e.EntityMappings
.GetFieldMappingByDbColumnName(fe.LocalColumn).TargetMemberType;
Type mapQueryType = typeof(DataModelQuery <>).MakeGenericType(new[] { mapType });
var mapQuery = (IDataModelQuery)Activator.CreateInstance(mapQueryType);
mapQuery.WhereColumn[fe.LocalColumn].IsEqualTo(
e.ColumnMappedValue[fe.LocalColumn]);
IDataModelCollection mapdes = LoadModels(mapType, mapQuery, transactionContext);
var mappedDEs = new DataModelCollection <DataModel>();
foreach (DataModel de in mapdes) // de is a MappingTable<L,R>
{
var mappedDEQuery = (IDataModelQuery)
Activator.CreateInstance(typeof(DataModelQuery <>)
.MakeGenericType(targetEntityType));
mappedDEQuery.WhereColumn[fe.RelatedTableColumn]
.IsEqualTo(de.ColumnMappedValue[fe.RelatedTableColumn]);
DataModel mappedDE = DeepLoadModel(targetEntityType, mappedDEQuery,
depth == null ? null : depth - 1,
transactionContext, loadedModels);
if (mappedDE != null)
{
mappedDEs.Add(mappedDE);
}
}
Type mmtargtype = fe.TargetMemberType;
var mmtargcol = (IList)Activator.CreateInstance(fe.TargetMemberType);
Type mapdeType = null;
foreach (DataModel mapde in mappedDEs)
{
if (mapdeType == null)
{
mapdeType = mapde.GetType();
}
object deinst = mapde;
if (mmtargtype.IsGenericType &&
!mmtargtype.GetGenericArguments()[0].IsDataModel())
{
deinst = mapde.Entity;
}
mmtargcol.Add(deinst);
}
if (fe.TargetMember is FieldInfo)
{
((FieldInfo)fe.TargetMember).SetValue(e, mmtargcol);
}
else if (fe.TargetMember is PropertyInfo)
{
((PropertyInfo)fe.TargetMember).SetValue(
e.Entity, mmtargcol, new object[] {});
}
break;
}
}
}
foreach (var field_kvp in e.EntityMappings.FieldMappings)
{
DataModelColumnAttribute field = field_kvp.Value;
if (field.IsForeignKey &&
field.ForeignKeyMapping.AssignToMember != null)
{
LoadMember(e, field, field_kvp.Key, transactionContext, loadedModels);
}
}
return(e);
}
