public override TypeUsage GetStoreType(TypeUsage typeUsage)
{
Debug.Assert(typeUsage != null, "typeUsage != null");
Debug.Assert(typeUsage.EdmType.BuiltInTypeKind == BuiltInTypeKind.PrimitiveType, "Primitive type expected.");
Debug.Assert(typeUsage.EdmType.GetDataSpace() == DataSpace.CSpace, "Expected CSpace type.");
try
{
var legacyStoreTypeUsage = _wrappedProviderManifest.GetStoreType(typeUsage.ToLegacyEdmTypeUsage());
return(ConvertFromLegacyStoreTypeUsage(legacyStoreTypeUsage));
}
catch (SystemData.ProviderIncompatibleException exception)
{
throw new ProviderIncompatibleException(exception.Message, exception.InnerException);
}
}
public void GetStoreType_returns_correct_default_type_usages_for_all_primitive_types()
{
// SqlProvider does not support SByte
foreach (var legacyEdmPrimitiveType in LegacyEdmPrimitiveTypes.Where(t => t.Key != "SByte"))
{
TypeUsageVerificationHelper.VerifyTypeUsagesEquivalent(
LegacyProviderManifest.GetStoreType(
LegacyMetadata.TypeUsage.CreateDefaultTypeUsage(legacyEdmPrimitiveType.Value)),
ProviderManifestWrapper.GetStoreType(
TypeUsage.CreateDefaultTypeUsage(EdmPrimitiveTypes[legacyEdmPrimitiveType.Key])));
}
}
/// <summary>
/// Determines if this column is a narrower data type than another column.
/// Used to determine if altering the supplied column definition to this definition will result in data loss.
/// </summary>
/// <param name = "column">The column to compare to.</param>
/// <param name = "providerManifest">Details of the database provider being used.</param>
/// <returns>True if this column is of a narrower data type.</returns>
public bool IsNarrowerThan(ColumnModel column, DbProviderManifest providerManifest)
{
//Contract.Requires(column != null);
//Contract.Requires(providerManifest != null);
var typeUsage = providerManifest.GetStoreType(TypeUsage);
var otherTypeUsage = providerManifest.GetStoreType(column.TypeUsage);
return (_typeSize[Type] < _typeSize[column.Type])
|| !(IsUnicode ?? true) && (column.IsUnicode ?? true)
|| !(IsNullable ?? true) && (column.IsNullable ?? true)
|| IsNarrowerThan(typeUsage, otherTypeUsage);
}
