/// <summary>
/// This method takes a type and a set of facets and returns the best mapped equivalent type
/// in SQL Server, taking the store version into consideration.
/// </summary>
/// <param name="storeType">A TypeUsage encapsulating an EDM type and a set of facets</param>
/// <returns>A TypeUsage encapsulating a store type and a set of facets</returns>
public override TypeUsage GetStoreType(TypeUsage edmType)
{
if (edmType == null)
{
throw new ArgumentNullException("edmType");
}
Debug.Assert(edmType.EdmType.BuiltInTypeKind == BuiltInTypeKind.PrimitiveType);
if (!(edmType.EdmType is PrimitiveType primitiveType))
{
throw new ArgumentException(string.Format("The underlying provider does not support the type '{0}'.", edmType));
}
var facets = edmType.Facets;
switch (primitiveType.PrimitiveTypeKind)
{
case PrimitiveTypeKind.Boolean:
return(TypeUsage.CreateDefaultTypeUsage(StoreTypeNameToStorePrimitiveType["smallint_bool"]));
case PrimitiveTypeKind.Int16:
return(TypeUsage.CreateDefaultTypeUsage(StoreTypeNameToStorePrimitiveType["smallint"]));
case PrimitiveTypeKind.Int32:
return(TypeUsage.CreateDefaultTypeUsage(StoreTypeNameToStorePrimitiveType["int"]));
case PrimitiveTypeKind.Int64:
return(TypeUsage.CreateDefaultTypeUsage(StoreTypeNameToStorePrimitiveType["bigint"]));
case PrimitiveTypeKind.Double:
return(TypeUsage.CreateDefaultTypeUsage(StoreTypeNameToStorePrimitiveType["double"]));
case PrimitiveTypeKind.Single:
return(TypeUsage.CreateDefaultTypeUsage(StoreTypeNameToStorePrimitiveType["float"]));
case PrimitiveTypeKind.Decimal: // decimal, numeric
{
if (!TypeHelpers.TryGetPrecision(edmType, out var precision))
{
precision = 9;
}
if (!TypeHelpers.TryGetScale(edmType, out var scale))
{
scale = 0;
}
return(TypeUsage.CreateDecimalTypeUsage(StoreTypeNameToStorePrimitiveType["decimal"], precision, scale));
}
case PrimitiveTypeKind.Binary: // blob
{
var isFixedLength = null != facets[MetadataHelpers.FixedLengthFacetName].Value && (bool)facets[MetadataHelpers.FixedLengthFacetName].Value;
var f = facets[MetadataHelpers.MaxLengthFacetName];
var isMaxLength = f.IsUnbounded || null == f.Value || (int)f.Value > BinaryMaxSize;
var maxLength = !isMaxLength ? (int)f.Value : Int32.MinValue;
TypeUsage tu;
if (isFixedLength)
{
tu = TypeUsage.CreateBinaryTypeUsage(StoreTypeNameToStorePrimitiveType["blob"], true, maxLength);
}
else
{
if (isMaxLength)
{
tu = TypeUsage.CreateBinaryTypeUsage(StoreTypeNameToStorePrimitiveType["blob"], false);
Debug.Assert(tu.Facets["MaxLength"].Description.IsConstant, "blob is not constant!");
}
else
{
tu = TypeUsage.CreateBinaryTypeUsage(StoreTypeNameToStorePrimitiveType["blob"], false, maxLength);
}
}
return(tu);
}
case PrimitiveTypeKind.String: // char, varchar, text blob
{
var isUnicode = null == facets[MetadataHelpers.UnicodeFacetName].Value || (bool)facets[MetadataHelpers.UnicodeFacetName].Value;
var isFixedLength = null != facets[MetadataHelpers.FixedLengthFacetName].Value && (bool)facets[MetadataHelpers.FixedLengthFacetName].Value;
var f = facets[MetadataHelpers.MaxLengthFacetName];
// maxlen is true if facet value is unbounded, the value is bigger than the limited string sizes *or* the facet
// value is null. this is needed since functions still have maxlength facet value as null
var isMaxLength = f.IsUnbounded || null == f.Value || (int)f.Value > (isUnicode ? UnicodeVarcharMaxSize : AsciiVarcharMaxSize);
var maxLength = !isMaxLength ? (int)f.Value : Int32.MinValue;
TypeUsage tu;
if (isUnicode)
{
if (isFixedLength)
{
tu = TypeUsage.CreateStringTypeUsage(StoreTypeNameToStorePrimitiveType["char"], true, true, maxLength);
}
else
{
if (isMaxLength)
{
tu = TypeUsage.CreateStringTypeUsage(StoreTypeNameToStorePrimitiveType["clob"], true, false);
}
else
{
tu = TypeUsage.CreateStringTypeUsage(StoreTypeNameToStorePrimitiveType["varchar"], true, false, maxLength);
}
}
}
else
{
if (isFixedLength)
{
tu = TypeUsage.CreateStringTypeUsage(StoreTypeNameToStorePrimitiveType["char"], false, true, maxLength);
}
else
{
if (isMaxLength)
{
tu = TypeUsage.CreateStringTypeUsage(StoreTypeNameToStorePrimitiveType["clob"], false, false);
}
else
{
tu = TypeUsage.CreateStringTypeUsage(StoreTypeNameToStorePrimitiveType["varchar"], false, false, maxLength);
}
}
}
return(tu);
}
case PrimitiveTypeKind.DateTime: // datetime, date
{
bool useTimestamp;
if (TypeHelpers.TryGetPrecision(edmType, out var precision))
{
if (precision == 0)
{
useTimestamp = false;
}
else
{
useTimestamp = true;
}
}
else
{
useTimestamp = true;
}
return(TypeUsage.CreateDefaultTypeUsage(useTimestamp ? StoreTypeNameToStorePrimitiveType["timestamp"] : StoreTypeNameToStorePrimitiveType["date"]));
}
case PrimitiveTypeKind.Time:
return(TypeUsage.CreateDefaultTypeUsage(StoreTypeNameToStorePrimitiveType["time"]));
case PrimitiveTypeKind.Guid:
return(TypeUsage.CreateDefaultTypeUsage(StoreTypeNameToStorePrimitiveType["guid"]));
default:
throw new NotSupportedException(string.Format("There is no store type corresponding to the EDM type '{0}' of primitive type '{1}'.", edmType, primitiveType.PrimitiveTypeKind));
}
}
/// <summary>
/// This method takes a type and a set of facets and returns the best mapped equivalent type
/// in EDM.
/// </summary>
/// <param name="storeType">A TypeUsage encapsulating a store type and a set of facets</param>
/// <returns>A TypeUsage encapsulating an EDM type and a set of facets</returns>
public override TypeUsage GetEdmType(TypeUsage storeType)
{
if (storeType == null)
{
throw new ArgumentNullException("storeType");
}
var storeTypeName = storeType.EdmType.Name.ToLowerInvariant();
if (!StoreTypeNameToEdmPrimitiveType.ContainsKey(storeTypeName))
{
throw new ArgumentException(string.Format("The underlying provider does not support the type '{0}'.", storeTypeName));
}
var edmPrimitiveType = base.StoreTypeNameToEdmPrimitiveType[storeTypeName];
var maxLength = 0;
var isUnicode = true;
var isFixedLen = false;
var isUnbounded = true;
PrimitiveTypeKind newPrimitiveTypeKind;
switch (storeTypeName)
{
// for some types we just go with simple type usage with no facets
case "smallint":
case "int":
case "bigint":
case "smallint_bool":
case "float":
case "double":
case "guid":
return(TypeUsage.CreateDefaultTypeUsage(edmPrimitiveType));
case "decimal":
case "numeric":
if (TypeHelpers.TryGetPrecision(storeType, out var precision) && TypeHelpers.TryGetScale(storeType, out var scale))
{
return(TypeUsage.CreateDecimalTypeUsage(edmPrimitiveType, precision, scale));
}
else
{
return(TypeUsage.CreateDecimalTypeUsage(edmPrimitiveType));
}
case "varchar":
newPrimitiveTypeKind = PrimitiveTypeKind.String;
isUnbounded = !TypeHelpers.TryGetMaxLength(storeType, out maxLength);
isUnicode = true; //TODO: hardcoded
isFixedLen = false;
break;
case "char":
newPrimitiveTypeKind = PrimitiveTypeKind.String;
isUnbounded = !TypeHelpers.TryGetMaxLength(storeType, out maxLength);
isUnicode = true; //TODO: hardcoded
isFixedLen = true;
break;
case "timestamp":
return(TypeUsage.CreateDateTimeTypeUsage(edmPrimitiveType, null));
case "date":
return(TypeUsage.CreateDateTimeTypeUsage(edmPrimitiveType, null));
case "time":
return(TypeUsage.CreateTimeTypeUsage(edmPrimitiveType, null));
case "blob":
newPrimitiveTypeKind = PrimitiveTypeKind.Binary;
isUnbounded = true;
isFixedLen = false;
break;
case "clob":
newPrimitiveTypeKind = PrimitiveTypeKind.String;
isUnbounded = true;
isUnicode = true; //TODO: hardcoded
isFixedLen = false;
break;
default:
throw new NotSupportedException(string.Format("The underlying provider does not support the type '{0}'.", storeTypeName));
}
Debug.Assert(newPrimitiveTypeKind == PrimitiveTypeKind.String || newPrimitiveTypeKind == PrimitiveTypeKind.Binary, "at this point only string and binary types should be present");
switch (newPrimitiveTypeKind)
{
case PrimitiveTypeKind.String:
if (!isUnbounded)
{
return(TypeUsage.CreateStringTypeUsage(edmPrimitiveType, isUnicode, isFixedLen, maxLength));
}
else
{
return(TypeUsage.CreateStringTypeUsage(edmPrimitiveType, isUnicode, isFixedLen));
}
case PrimitiveTypeKind.Binary:
if (!isUnbounded)
{
return(TypeUsage.CreateBinaryTypeUsage(edmPrimitiveType, isFixedLen, maxLength));
}
else
{
return(TypeUsage.CreateBinaryTypeUsage(edmPrimitiveType, isFixedLen));
}
default:
throw new NotSupportedException(string.Format("The underlying provider does not support the type '{0}'.", storeTypeName));
}
}
