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|
//------------------------------------------------------------------------------
// <copyright file="MetaDataUtilsSmi.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
namespace Microsoft.SqlServer.Server {
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.Sql;
using System.Data.Common;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using System.Diagnostics;
// Utilities for manipulating smi-related metadata.
//
// THIS CLASS IS BUILT ON TOP OF THE SMI INTERFACE -- SMI SHOULD NOT DEPEND ON IT!
//
// These are all based off of knowing the clr type of the value
// as an ExtendedClrTypeCode enum for rapid access (lookup in static array is best, if possible).
internal class MetaDataUtilsSmi {
internal const SqlDbType InvalidSqlDbType = (SqlDbType) (-1);
internal const long InvalidMaxLength = -2;
// Standard type inference map to get SqlDbType when all you know is the value's type (typecode)
// This map's index is off by one (add one to typecode locate correct entry) in order
// support ExtendedSqlDbType.Invalid
// ONLY ACCESS THIS ARRAY FROM InferSqlDbTypeFromTypeCode!!!
static readonly SqlDbType[] __extendedTypeCodeToSqlDbTypeMap = {
InvalidSqlDbType, // Invalid extended type code
SqlDbType.Bit, // System.Boolean
SqlDbType.TinyInt, // System.Byte
SqlDbType.NVarChar, // System.Char
SqlDbType.DateTime, // System.DateTime
InvalidSqlDbType, // System.DBNull doesn't have an inferable SqlDbType
SqlDbType.Decimal, // System.Decimal
SqlDbType.Float, // System.Double
InvalidSqlDbType, // null reference doesn't have an inferable SqlDbType
SqlDbType.SmallInt, // System.Int16
SqlDbType.Int, // System.Int32
SqlDbType.BigInt, // System.Int64
InvalidSqlDbType, // System.SByte doesn't have an inferable SqlDbType
SqlDbType.Real, // System.Single
SqlDbType.NVarChar, // System.String
InvalidSqlDbType, // System.UInt16 doesn't have an inferable SqlDbType
InvalidSqlDbType, // System.UInt32 doesn't have an inferable SqlDbType
InvalidSqlDbType, // System.UInt64 doesn't have an inferable SqlDbType
InvalidSqlDbType, // System.Object doesn't have an inferable SqlDbType
SqlDbType.VarBinary, // System.ByteArray
SqlDbType.NVarChar, // System.CharArray
SqlDbType.UniqueIdentifier, // System.Guid
SqlDbType.VarBinary, // System.Data.SqlTypes.SqlBinary
SqlDbType.Bit, // System.Data.SqlTypes.SqlBoolean
SqlDbType.TinyInt, // System.Data.SqlTypes.SqlByte
SqlDbType.DateTime, // System.Data.SqlTypes.SqlDateTime
SqlDbType.Float, // System.Data.SqlTypes.SqlDouble
SqlDbType.UniqueIdentifier, // System.Data.SqlTypes.SqlGuid
SqlDbType.SmallInt, // System.Data.SqlTypes.SqlInt16
SqlDbType.Int, // System.Data.SqlTypes.SqlInt32
SqlDbType.BigInt, // System.Data.SqlTypes.SqlInt64
SqlDbType.Money, // System.Data.SqlTypes.SqlMoney
SqlDbType.Decimal, // System.Data.SqlTypes.SqlDecimal
SqlDbType.Real, // System.Data.SqlTypes.SqlSingle
SqlDbType.NVarChar, // System.Data.SqlTypes.SqlString
SqlDbType.NVarChar, // System.Data.SqlTypes.SqlChars
SqlDbType.VarBinary, // System.Data.SqlTypes.SqlBytes
SqlDbType.Xml, // System.Data.SqlTypes.SqlXml
SqlDbType.Structured, // System.Data.DataTable
SqlDbType.Structured, // System.Collections.IEnumerable, used for TVPs it must return IDataRecord
SqlDbType.Structured, // System.Collections.Generic.IEnumerable<Microsoft.SqlServer.Server.SqlDataRecord>
SqlDbType.Time, // System.TimeSpan
SqlDbType.DateTimeOffset, // System.DateTimeOffset
};
// Hash table to map from clr type object to ExtendedClrTypeCodeMap enum
// ONLY ACCESS THIS HASH TABLE FROM DetermineExtendedTypeCode METHOD!!! (and class ctor for setup)
static readonly Hashtable __typeToExtendedTypeCodeMap;
// class ctor
static MetaDataUtilsSmi() {
// set up type mapping hash table
// keep this initialization list in the same order as ExtendedClrTypeCode for ease in validating!
Hashtable ht = new Hashtable(42);
ht.Add( typeof( System.Boolean ), ExtendedClrTypeCode.Boolean );
ht.Add( typeof( System.Byte ), ExtendedClrTypeCode.Byte );
ht.Add( typeof( System.Char ), ExtendedClrTypeCode.Char );
ht.Add( typeof( System.DateTime ), ExtendedClrTypeCode.DateTime );
ht.Add( typeof( System.DBNull ), ExtendedClrTypeCode.DBNull );
ht.Add( typeof( System.Decimal ), ExtendedClrTypeCode.Decimal );
ht.Add( typeof( System.Double ), ExtendedClrTypeCode.Double );
// lookup code will have to special-case null-ref anyway, so don't bother adding ExtendedTypeCode.Empty to the table
ht.Add( typeof( System.Int16 ), ExtendedClrTypeCode.Int16 );
ht.Add( typeof( System.Int32 ), ExtendedClrTypeCode.Int32 );
ht.Add( typeof( System.Int64 ), ExtendedClrTypeCode.Int64 );
ht.Add( typeof( System.SByte ), ExtendedClrTypeCode.SByte );
ht.Add( typeof( System.Single ), ExtendedClrTypeCode.Single );
ht.Add( typeof( System.String ), ExtendedClrTypeCode.String );
ht.Add( typeof( System.UInt16 ), ExtendedClrTypeCode.UInt16 );
ht.Add( typeof( System.UInt32 ), ExtendedClrTypeCode.UInt32 );
ht.Add( typeof( System.UInt64 ), ExtendedClrTypeCode.UInt64 );
ht.Add( typeof( System.Object ), ExtendedClrTypeCode.Object );
ht.Add( typeof( System.Byte[] ), ExtendedClrTypeCode.ByteArray );
ht.Add( typeof( System.Char[] ), ExtendedClrTypeCode.CharArray );
ht.Add( typeof( System.Guid ), ExtendedClrTypeCode.Guid );
ht.Add( typeof( SqlBinary ), ExtendedClrTypeCode.SqlBinary );
ht.Add( typeof( SqlBoolean ), ExtendedClrTypeCode.SqlBoolean );
ht.Add( typeof( SqlByte ), ExtendedClrTypeCode.SqlByte );
ht.Add( typeof( SqlDateTime ), ExtendedClrTypeCode.SqlDateTime );
ht.Add( typeof( SqlDouble ), ExtendedClrTypeCode.SqlDouble );
ht.Add( typeof( SqlGuid ), ExtendedClrTypeCode.SqlGuid );
ht.Add( typeof( SqlInt16 ), ExtendedClrTypeCode.SqlInt16 );
ht.Add( typeof( SqlInt32 ), ExtendedClrTypeCode.SqlInt32 );
ht.Add( typeof( SqlInt64 ), ExtendedClrTypeCode.SqlInt64 );
ht.Add( typeof( SqlMoney ), ExtendedClrTypeCode.SqlMoney );
ht.Add( typeof( SqlDecimal ), ExtendedClrTypeCode.SqlDecimal );
ht.Add( typeof( SqlSingle ), ExtendedClrTypeCode.SqlSingle );
ht.Add( typeof( SqlString ), ExtendedClrTypeCode.SqlString );
ht.Add( typeof( SqlChars ), ExtendedClrTypeCode.SqlChars );
ht.Add( typeof( SqlBytes ), ExtendedClrTypeCode.SqlBytes );
ht.Add( typeof( SqlXml ), ExtendedClrTypeCode.SqlXml );
ht.Add( typeof( DataTable ), ExtendedClrTypeCode.DataTable );
ht.Add( typeof( DbDataReader ), ExtendedClrTypeCode.DbDataReader );
ht.Add( typeof( IEnumerable<SqlDataRecord> ), ExtendedClrTypeCode.IEnumerableOfSqlDataRecord );
ht.Add( typeof( System.TimeSpan ), ExtendedClrTypeCode.TimeSpan );
ht.Add( typeof( System.DateTimeOffset ), ExtendedClrTypeCode.DateTimeOffset );
__typeToExtendedTypeCodeMap = ht;
}
internal static bool IsCharOrXmlType(SqlDbType type) {
return IsUnicodeType(type) ||
IsAnsiType(type) ||
type == SqlDbType.Xml;
}
internal static bool IsUnicodeType(SqlDbType type) {
return type == SqlDbType.NChar ||
type == SqlDbType.NVarChar ||
type == SqlDbType.NText;
}
internal static bool IsAnsiType(SqlDbType type) {
return type == SqlDbType.Char ||
type == SqlDbType.VarChar ||
type == SqlDbType.Text;
}
internal static bool IsBinaryType(SqlDbType type) {
return type == SqlDbType.Binary ||
type == SqlDbType.VarBinary ||
type == SqlDbType.Image;
}
// Does this type use PLP format values?
internal static bool IsPlpFormat(SmiMetaData metaData) {
return metaData.MaxLength == SmiMetaData.UnlimitedMaxLengthIndicator ||
metaData.SqlDbType == SqlDbType.Image ||
metaData.SqlDbType == SqlDbType.NText ||
metaData.SqlDbType == SqlDbType.Text ||
metaData.SqlDbType == SqlDbType.Udt;
}
// If we know we're only going to use this object to assign to a specific SqlDbType back end object,
// we can save some processing time by only checking for the few valid types that can be assigned to the dbType.
// This assumes a switch statement over SqlDbType is faster than getting the ClrTypeCode and iterating over a
// series of if statements, or using a hash table.
// NOTE: the form of these checks is taking advantage of a feature of the JIT compiler that is supposed to
// optimize checks of the form '(xxx.GetType() == typeof( YYY ))'. The JIT team claimed at one point that
// this doesn't even instantiate a Type instance, thus was the fastest method for individual comparisions.
// Given that there's a known SqlDbType, thus a minimal number of comparisions, it's likely this is faster
// than the other approaches considered (both GetType().GetTypeCode() switch and hash table using Type keys
// must instantiate a Type object. The typecode switch also degenerates into a large if-then-else for
// all but the primitive clr types.
internal static ExtendedClrTypeCode DetermineExtendedTypeCodeForUseWithSqlDbType(
SqlDbType dbType,
bool isMultiValued,
object value,
Type udtType,
ulong smiVersion) {
ExtendedClrTypeCode extendedCode = ExtendedClrTypeCode.Invalid;
// fast-track null, which is valid for all types
if ( null == value ) {
extendedCode = ExtendedClrTypeCode.Empty;
}
else if ( DBNull.Value == value ) {
extendedCode = ExtendedClrTypeCode.DBNull;
}
else {
switch(dbType)
{
case SqlDbType.BigInt:
if (value.GetType() == typeof(Int64))
extendedCode = ExtendedClrTypeCode.Int64;
else if (value.GetType() == typeof(SqlInt64))
extendedCode = ExtendedClrTypeCode.SqlInt64;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.Int64)
extendedCode = ExtendedClrTypeCode.Int64;
break;
case SqlDbType.Binary:
case SqlDbType.VarBinary:
case SqlDbType.Image:
case SqlDbType.Timestamp:
if (value.GetType() == typeof( byte[] ))
extendedCode = ExtendedClrTypeCode.ByteArray;
else if (value.GetType() == typeof( SqlBinary ))
extendedCode = ExtendedClrTypeCode.SqlBinary;
else if (value.GetType() == typeof( SqlBytes ))
extendedCode = ExtendedClrTypeCode.SqlBytes;
else if (value.GetType() == typeof(StreamDataFeed))
extendedCode = ExtendedClrTypeCode.Stream;
break;
case SqlDbType.Bit:
if (value.GetType() == typeof( bool ))
extendedCode = ExtendedClrTypeCode.Boolean;
else if (value.GetType() == typeof( SqlBoolean ))
extendedCode = ExtendedClrTypeCode.SqlBoolean;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.Boolean)
extendedCode = ExtendedClrTypeCode.Boolean;
break;
case SqlDbType.Char:
case SqlDbType.NChar:
case SqlDbType.NText:
case SqlDbType.NVarChar:
case SqlDbType.Text:
case SqlDbType.VarChar:
if (value.GetType() == typeof( string ))
extendedCode = ExtendedClrTypeCode.String;
if (value.GetType() == typeof(TextDataFeed))
extendedCode = ExtendedClrTypeCode.TextReader;
else if (value.GetType() == typeof(SqlString))
extendedCode = ExtendedClrTypeCode.SqlString;
else if (value.GetType() == typeof(char[]))
extendedCode = ExtendedClrTypeCode.CharArray;
else if (value.GetType() == typeof(SqlChars))
extendedCode = ExtendedClrTypeCode.SqlChars;
else if (value.GetType() == typeof(char))
extendedCode = ExtendedClrTypeCode.Char;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.Char)
extendedCode = ExtendedClrTypeCode.Char;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.String)
extendedCode = ExtendedClrTypeCode.String;
break;
case SqlDbType.Date:
case SqlDbType.DateTime2:
if (smiVersion >= SmiContextFactory.KatmaiVersion) {
goto case SqlDbType.DateTime;
}
break;
case SqlDbType.DateTime:
case SqlDbType.SmallDateTime:
if (value.GetType() == typeof( DateTime ))
extendedCode = ExtendedClrTypeCode.DateTime;
else if (value.GetType() == typeof( SqlDateTime ))
extendedCode = ExtendedClrTypeCode.SqlDateTime;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.DateTime)
extendedCode = ExtendedClrTypeCode.DateTime;
break;
case SqlDbType.Decimal:
if (value.GetType() == typeof( Decimal ))
extendedCode = ExtendedClrTypeCode.Decimal;
else if (value.GetType() == typeof( SqlDecimal ))
extendedCode = ExtendedClrTypeCode.SqlDecimal;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.Decimal)
extendedCode = ExtendedClrTypeCode.Decimal;
break;
case SqlDbType.Real:
if (value.GetType() == typeof( Single ))
extendedCode = ExtendedClrTypeCode.Single;
else if (value.GetType() == typeof( SqlSingle ))
extendedCode = ExtendedClrTypeCode.SqlSingle;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.Single)
extendedCode = ExtendedClrTypeCode.Single;
break;
case SqlDbType.Int:
if (value.GetType() == typeof( Int32 ))
extendedCode = ExtendedClrTypeCode.Int32;
else if (value.GetType() == typeof( SqlInt32 ))
extendedCode = ExtendedClrTypeCode.SqlInt32;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.Int32)
extendedCode = ExtendedClrTypeCode.Int32;
break;
case SqlDbType.Money:
case SqlDbType.SmallMoney:
if (value.GetType() == typeof( SqlMoney ))
extendedCode = ExtendedClrTypeCode.SqlMoney;
else if (value.GetType() == typeof( Decimal ))
extendedCode = ExtendedClrTypeCode.Decimal;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.Decimal)
extendedCode = ExtendedClrTypeCode.Decimal;
break;
case SqlDbType.Float:
if (value.GetType() == typeof( SqlDouble ))
extendedCode = ExtendedClrTypeCode.SqlDouble;
else if (value.GetType() == typeof( Double ))
extendedCode = ExtendedClrTypeCode.Double;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.Double)
extendedCode = ExtendedClrTypeCode.Double;
break;
case SqlDbType.UniqueIdentifier:
if (value.GetType() == typeof( SqlGuid ))
extendedCode = ExtendedClrTypeCode.SqlGuid;
else if (value.GetType() == typeof( Guid ))
extendedCode = ExtendedClrTypeCode.Guid;
break;
case SqlDbType.SmallInt:
if (value.GetType() == typeof( Int16 ))
extendedCode = ExtendedClrTypeCode.Int16;
else if (value.GetType() == typeof( SqlInt16 ))
extendedCode = ExtendedClrTypeCode.SqlInt16;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.Int16)
extendedCode = ExtendedClrTypeCode.Int16;
break;
case SqlDbType.TinyInt:
if (value.GetType() == typeof( Byte ))
extendedCode = ExtendedClrTypeCode.Byte;
else if (value.GetType() == typeof( SqlByte ))
extendedCode = ExtendedClrTypeCode.SqlByte;
else if (Type.GetTypeCode(value.GetType()) == TypeCode.Byte)
extendedCode = ExtendedClrTypeCode.Byte;
break;
case SqlDbType.Variant:
// SqlDbType doesn't help us here, call general-purpose function
extendedCode = DetermineExtendedTypeCode( value );
// Some types aren't allowed for Variants but are for the general-purpos function.
// Match behavior of other types and return invalid in these cases.
if ( ExtendedClrTypeCode.SqlXml == extendedCode ) {
extendedCode = ExtendedClrTypeCode.Invalid;
}
break;
case SqlDbType.Udt:
// Validate UDT type if caller gave us a type to validate against
if ( null == udtType ||
value.GetType() == udtType
) {
extendedCode = ExtendedClrTypeCode.Object;
}
else {
extendedCode = ExtendedClrTypeCode.Invalid;
}
break;
case SqlDbType.Time:
if (value.GetType() == typeof(TimeSpan) && smiVersion >= SmiContextFactory.KatmaiVersion)
extendedCode = ExtendedClrTypeCode.TimeSpan;
break;
case SqlDbType.DateTimeOffset:
if (value.GetType() == typeof(DateTimeOffset) && smiVersion >= SmiContextFactory.KatmaiVersion)
extendedCode = ExtendedClrTypeCode.DateTimeOffset;
break;
case SqlDbType.Xml:
if (value.GetType() == typeof( SqlXml ))
extendedCode = ExtendedClrTypeCode.SqlXml;
if (value.GetType() == typeof(XmlDataFeed))
extendedCode = ExtendedClrTypeCode.XmlReader;
else if (value.GetType() == typeof( System.String ))
extendedCode = ExtendedClrTypeCode.String;
break;
case SqlDbType.Structured:
if (isMultiValued) {
if (value is DataTable) {
extendedCode = ExtendedClrTypeCode.DataTable;
}
// Order is important, since some of these types are base types of the others.
// Evaluate from most derived to parent types
else if (value is IEnumerable<SqlDataRecord>) {
extendedCode = ExtendedClrTypeCode.IEnumerableOfSqlDataRecord;
}
else if (value is DbDataReader) {
extendedCode = ExtendedClrTypeCode.DbDataReader;
}
}
break;
default:
// Leave as invalid
break;
}
}
return extendedCode;
}
// Method to map from Type to ExtendedTypeCode
static internal ExtendedClrTypeCode DetermineExtendedTypeCodeFromType(Type clrType) {
object result = __typeToExtendedTypeCodeMap[clrType];
ExtendedClrTypeCode resultCode;
if ( null == result ) {
resultCode = ExtendedClrTypeCode.Invalid;
}
else {
resultCode = (ExtendedClrTypeCode) result;
}
return resultCode;
}
// Returns the ExtendedClrTypeCode that describes the given value
//
static internal ExtendedClrTypeCode DetermineExtendedTypeCode( object value ) {
ExtendedClrTypeCode resultCode;
if ( null == value ) {
resultCode = ExtendedClrTypeCode.Empty;
}
else {
resultCode = DetermineExtendedTypeCodeFromType(value.GetType());
}
return resultCode;
}
// returns a sqldbtype for the given type code
static internal SqlDbType InferSqlDbTypeFromTypeCode( ExtendedClrTypeCode typeCode ) {
Debug.Assert( typeCode >= ExtendedClrTypeCode.Invalid && typeCode <= ExtendedClrTypeCode.Last, "Someone added a typecode without adding support here!" );
return __extendedTypeCodeToSqlDbTypeMap[ (int) typeCode+1 ];
}
// Infer SqlDbType from Type in the general case. Katmai-only (or later) features that need to
// infer types should use InferSqlDbTypeFromType_Katmai.
static internal SqlDbType InferSqlDbTypeFromType(Type type) {
ExtendedClrTypeCode typeCode = DetermineExtendedTypeCodeFromType(type);
SqlDbType returnType;
if (ExtendedClrTypeCode.Invalid == typeCode) {
returnType = InvalidSqlDbType; // Return invalid type so caller can generate specific error
}
else {
returnType = InferSqlDbTypeFromTypeCode(typeCode);
}
return returnType;
}
// Inference rules changed for Katmai-or-later-only cases. Only features that are guaranteed to be
// running against Katmai and don't have backward compat issues should call this code path.
// example: TVP's are a new Katmai feature (no back compat issues) so can infer DATETIME2
// when mapping System.DateTime from DateTable or DbDataReader. DATETIME2 is better because
// of greater range that can handle all DateTime values.
static internal SqlDbType InferSqlDbTypeFromType_Katmai(Type type) {
SqlDbType returnType = InferSqlDbTypeFromType(type);
if (SqlDbType.DateTime == returnType) {
returnType = SqlDbType.DateTime2;
}
return returnType;
}
static internal bool IsValidForSmiVersion(SmiExtendedMetaData md, ulong smiVersion) {
if (SmiContextFactory.LatestVersion == smiVersion) {
return true;
}
else {
// Yukon doesn't support Structured nor the new time types
Debug.Assert(SmiContextFactory.YukonVersion == smiVersion, "Other versions should have been eliminated during link stage");
return md.SqlDbType != SqlDbType.Structured &&
md.SqlDbType != SqlDbType.Date &&
md.SqlDbType != SqlDbType.DateTime2 &&
md.SqlDbType != SqlDbType.DateTimeOffset &&
md.SqlDbType != SqlDbType.Time;
}
}
static internal SqlMetaData SmiExtendedMetaDataToSqlMetaData(SmiExtendedMetaData source) {
if (SqlDbType.Xml == source.SqlDbType) {
return new SqlMetaData(source.Name,
source.SqlDbType,
source.MaxLength,
source.Precision,
source.Scale,
source.LocaleId,
source.CompareOptions,
source.TypeSpecificNamePart1,
source.TypeSpecificNamePart2,
source.TypeSpecificNamePart3,
true,
source.Type);
}
return new SqlMetaData(source.Name,
source.SqlDbType,
source.MaxLength,
source.Precision,
source.Scale,
source.LocaleId,
source.CompareOptions,
source.Type);
}
// Convert SqlMetaData instance to an SmiExtendedMetaData instance.
internal static SmiExtendedMetaData SqlMetaDataToSmiExtendedMetaData( SqlMetaData source ) {
// now map everything across to the extended metadata object
string typeSpecificNamePart1 = null;
string typeSpecificNamePart2 = null;
string typeSpecificNamePart3 = null;
if (SqlDbType.Xml == source.SqlDbType) {
typeSpecificNamePart1 = source.XmlSchemaCollectionDatabase;
typeSpecificNamePart2 = source.XmlSchemaCollectionOwningSchema;
typeSpecificNamePart3 = source.XmlSchemaCollectionName;
}
else if (SqlDbType.Udt == source.SqlDbType) {
// Split the input name. UdtTypeName is specified as single 3 part name.
// NOTE: ParseUdtTypeName throws if format is incorrect
string typeName = source.ServerTypeName;
if (null != typeName) {
String[] names = SqlParameter.ParseTypeName(typeName, true /* is for UdtTypeName */);
if (1 == names.Length) {
typeSpecificNamePart3 = names[0];
}
else if (2 == names.Length) {
typeSpecificNamePart2 = names[0];
typeSpecificNamePart3 = names[1];
}
else if (3 == names.Length) {
typeSpecificNamePart1 = names[0];
typeSpecificNamePart2 = names[1];
typeSpecificNamePart3 = names[2];
}
else {
throw ADP.ArgumentOutOfRange("typeName");
}
if ((!ADP.IsEmpty(typeSpecificNamePart1) && TdsEnums.MAX_SERVERNAME < typeSpecificNamePart1.Length)
|| (!ADP.IsEmpty(typeSpecificNamePart2) && TdsEnums.MAX_SERVERNAME < typeSpecificNamePart2.Length)
|| (!ADP.IsEmpty(typeSpecificNamePart3) && TdsEnums.MAX_SERVERNAME < typeSpecificNamePart3.Length)) {
throw ADP.ArgumentOutOfRange("typeName");
}
}
}
return new SmiExtendedMetaData( source.SqlDbType,
source.MaxLength,
source.Precision,
source.Scale,
source.LocaleId,
source.CompareOptions,
source.Type,
source.Name,
typeSpecificNamePart1,
typeSpecificNamePart2,
typeSpecificNamePart3 );
}
// compare SmiMetaData to SqlMetaData and determine if they are compatible.
static internal bool IsCompatible(SmiMetaData firstMd, SqlMetaData secondMd) {
return firstMd.SqlDbType == secondMd.SqlDbType &&
firstMd.MaxLength == secondMd.MaxLength &&
firstMd.Precision == secondMd.Precision &&
firstMd.Scale == secondMd.Scale &&
firstMd.CompareOptions == secondMd.CompareOptions &&
firstMd.LocaleId == secondMd.LocaleId &&
firstMd.Type == secondMd.Type &&
firstMd.SqlDbType != SqlDbType.Structured && // SqlMetaData doesn't support Structured types
!firstMd.IsMultiValued; // SqlMetaData doesn't have a "multivalued" option
}
static internal long AdjustMaxLength(SqlDbType dbType, long maxLength) {
if (SmiMetaData.UnlimitedMaxLengthIndicator != maxLength) {
if (maxLength < 0) {
maxLength = InvalidMaxLength;
}
switch(dbType) {
case SqlDbType.Binary:
if (maxLength > SmiMetaData.MaxBinaryLength) {
maxLength = InvalidMaxLength;
}
break;
case SqlDbType.Char:
if (maxLength > SmiMetaData.MaxANSICharacters) {
maxLength = InvalidMaxLength;
}
break;
case SqlDbType.NChar:
if (maxLength > SmiMetaData.MaxUnicodeCharacters) {
maxLength = InvalidMaxLength;
}
break;
case SqlDbType.NVarChar:
// Promote to MAX type if it won't fit in a normal type
if (SmiMetaData.MaxUnicodeCharacters < maxLength) {
maxLength = SmiMetaData.UnlimitedMaxLengthIndicator;
}
break;
case SqlDbType.VarBinary:
// Promote to MAX type if it won't fit in a normal type
if (SmiMetaData.MaxBinaryLength < maxLength) {
maxLength = SmiMetaData.UnlimitedMaxLengthIndicator;
}
break;
case SqlDbType.VarChar:
// Promote to MAX type if it won't fit in a normal type
if (SmiMetaData.MaxANSICharacters < maxLength) {
maxLength = SmiMetaData.UnlimitedMaxLengthIndicator;
}
break;
default:
break;
}
}
return maxLength;
}
// Extract metadata for a single DataColumn
static internal SmiExtendedMetaData SmiMetaDataFromDataColumn(DataColumn column, DataTable parent) {
SqlDbType dbType = InferSqlDbTypeFromType_Katmai(column.DataType);
if (InvalidSqlDbType == dbType) {
throw SQL.UnsupportedColumnTypeForSqlProvider(column.ColumnName, column.DataType.Name);
}
long maxLength = AdjustMaxLength(dbType, column.MaxLength);
if (InvalidMaxLength == maxLength) {
throw SQL.InvalidColumnMaxLength(column.ColumnName, maxLength);
}
byte precision;
byte scale;
if (column.DataType == typeof(SqlDecimal)) {
// Must scan all values in column to determine best-fit precision & scale
Debug.Assert(null != parent);
scale = 0;
byte nonFractionalPrecision = 0; // finds largest non-Fractional portion of precision
foreach (DataRow row in parent.Rows) {
object obj = row[column];
if (!(obj is DBNull)) {
SqlDecimal value = (SqlDecimal) obj;
if (!value.IsNull) {
byte tempNonFractPrec = checked((byte) (value.Precision - value.Scale));
if (tempNonFractPrec > nonFractionalPrecision) {
nonFractionalPrecision = tempNonFractPrec;
}
if (value.Scale > scale) {
scale = value.Scale;
}
}
}
}
precision = checked((byte)(nonFractionalPrecision + scale));
if (SqlDecimal.MaxPrecision < precision) {
throw SQL.InvalidTableDerivedPrecisionForTvp(column.ColumnName, precision);
}
else if (0 == precision) {
precision = 1;
}
}
else if (dbType == SqlDbType.DateTime2 || dbType == SqlDbType.DateTimeOffset || dbType == SqlDbType.Time) {
// Time types care about scale, too. But have to infer maximums for these.
precision = 0;
scale = SmiMetaData.DefaultTime.Scale;
}
else if (dbType == SqlDbType.Decimal) {
// Must scan all values in column to determine best-fit precision & scale
Debug.Assert(null != parent);
scale = 0;
byte nonFractionalPrecision = 0; // finds largest non-Fractional portion of precision
foreach (DataRow row in parent.Rows) {
object obj = row[column];
if (!(obj is DBNull)) {
SqlDecimal value = (SqlDecimal)(Decimal)obj;
byte tempNonFractPrec = checked((byte)(value.Precision - value.Scale));
if (tempNonFractPrec > nonFractionalPrecision) {
nonFractionalPrecision = tempNonFractPrec;
}
if (value.Scale > scale) {
scale = value.Scale;
}
}
}
precision = checked((byte)(nonFractionalPrecision + scale));
if (SqlDecimal.MaxPrecision < precision) {
throw SQL.InvalidTableDerivedPrecisionForTvp(column.ColumnName, precision);
}
else if (0 == precision) {
precision = 1;
}
}
else {
precision = 0;
scale = 0;
}
return new SmiExtendedMetaData(
dbType,
maxLength,
precision,
scale,
column.Locale.LCID,
SmiMetaData.DefaultNVarChar.CompareOptions,
column.DataType,
false, // no support for multi-valued columns in a TVP yet
null, // no support for structured columns yet
null, // no support for structured columns yet
column.ColumnName,
null,
null,
null);
}
// Map SmiMetaData from a schema table.
// DEVNOTE: since we're using SchemaTable, we can assume that we aren't directly using a SqlDataReader
// so we don't support the Sql-specific stuff, like collation
static internal SmiExtendedMetaData SmiMetaDataFromSchemaTableRow(DataRow schemaRow) {
// One way or another, we'll need column name, so put it in a local now to shorten code later.
string colName = "";
object temp = schemaRow[SchemaTableColumn.ColumnName];
if (DBNull.Value != temp) {
colName = (string)temp;
}
// Determine correct SqlDbType.
temp = schemaRow[SchemaTableColumn.DataType];
if (DBNull.Value == temp) {
throw SQL.NullSchemaTableDataTypeNotSupported(colName);
}
Type colType = (Type)temp;
SqlDbType colDbType = InferSqlDbTypeFromType_Katmai(colType);
if (InvalidSqlDbType == colDbType) {
// Unknown through standard mapping, use VarBinary for columns that are Object typed, otherwise error
if (typeof(object) == colType) {
colDbType = SqlDbType.VarBinary;
}
else {
throw SQL.UnsupportedColumnTypeForSqlProvider(colName, colType.ToString());
}
}
// Determine metadata modifier values per type (maxlength, precision, scale, etc)
long maxLength = 0;
byte precision = 0;
byte scale = 0;
switch (colDbType) {
case SqlDbType.BigInt:
case SqlDbType.Bit:
case SqlDbType.DateTime:
case SqlDbType.Float:
case SqlDbType.Image:
case SqlDbType.Int:
case SqlDbType.Money:
case SqlDbType.NText:
case SqlDbType.Real:
case SqlDbType.UniqueIdentifier:
case SqlDbType.SmallDateTime:
case SqlDbType.SmallInt:
case SqlDbType.SmallMoney:
case SqlDbType.Text:
case SqlDbType.Timestamp:
case SqlDbType.TinyInt:
case SqlDbType.Variant:
case SqlDbType.Xml:
case SqlDbType.Date:
// These types require no metadata modifies
break;
case SqlDbType.Binary:
case SqlDbType.VarBinary:
// These types need a binary max length
temp = schemaRow[SchemaTableColumn.ColumnSize];
if (DBNull.Value == temp) {
// source isn't specifying a size, so assume the worst
if (SqlDbType.Binary == colDbType) {
maxLength = SmiMetaData.MaxBinaryLength;
}
else {
maxLength = SmiMetaData.UnlimitedMaxLengthIndicator;
}
}
else {
// We (should) have a valid maxlength, so use it.
maxLength = Convert.ToInt64(temp, null);
// Max length must be 0 to MaxBinaryLength or it can be UnlimitedMAX if type is varbinary
// If it's greater than MaxBinaryLength, just promote it to UnlimitedMAX, if possible
if (maxLength > SmiMetaData.MaxBinaryLength) {
maxLength = SmiMetaData.UnlimitedMaxLengthIndicator;
}
if ((maxLength < 0 &&
(maxLength != SmiMetaData.UnlimitedMaxLengthIndicator ||
SqlDbType.Binary == colDbType))) {
throw SQL.InvalidColumnMaxLength(colName, maxLength);
}
}
break;
case SqlDbType.Char:
case SqlDbType.VarChar:
// These types need an ANSI max length
temp = schemaRow[SchemaTableColumn.ColumnSize];
if (DBNull.Value == temp) {
// source isn't specifying a size, so assume the worst
if (SqlDbType.Char == colDbType) {
maxLength = SmiMetaData.MaxANSICharacters;
}
else {
maxLength = SmiMetaData.UnlimitedMaxLengthIndicator;
}
}
else {
// We (should) have a valid maxlength, so use it.
maxLength = Convert.ToInt64(temp, null);
// Max length must be 0 to MaxANSICharacters or it can be UnlimitedMAX if type is varbinary
// If it's greater than MaxANSICharacters, just promote it to UnlimitedMAX, if possible
if (maxLength > SmiMetaData.MaxANSICharacters) {
maxLength = SmiMetaData.UnlimitedMaxLengthIndicator;
}
if ((maxLength < 0 &&
(maxLength != SmiMetaData.UnlimitedMaxLengthIndicator ||
SqlDbType.Char == colDbType))) {
throw SQL.InvalidColumnMaxLength(colName, maxLength);
}
}
break;
case SqlDbType.NChar:
case SqlDbType.NVarChar:
// These types need a unicode max length
temp = schemaRow[SchemaTableColumn.ColumnSize];
if (DBNull.Value == temp) {
// source isn't specifying a size, so assume the worst
if (SqlDbType.NChar == colDbType) {
maxLength = SmiMetaData.MaxUnicodeCharacters;
}
else {
maxLength = SmiMetaData.UnlimitedMaxLengthIndicator;
}
}
else {
// We (should) have a valid maxlength, so use it.
maxLength = Convert.ToInt64(temp, null);
// Max length must be 0 to MaxUnicodeCharacters or it can be UnlimitedMAX if type is varbinary
// If it's greater than MaxUnicodeCharacters, just promote it to UnlimitedMAX, if possible
if (maxLength > SmiMetaData.MaxUnicodeCharacters) {
maxLength = SmiMetaData.UnlimitedMaxLengthIndicator;
}
if ((maxLength < 0 &&
(maxLength != SmiMetaData.UnlimitedMaxLengthIndicator ||
SqlDbType.NChar == colDbType))) {
throw SQL.InvalidColumnMaxLength(colName, maxLength);
}
}
break;
case SqlDbType.Decimal:
// Decimal requires precision and scale
temp = schemaRow[SchemaTableColumn.NumericPrecision];
if (DBNull.Value == temp) {
precision = SmiMetaData.DefaultDecimal.Precision;
}
else {
precision = Convert.ToByte(temp, null);
}
temp = schemaRow[SchemaTableColumn.NumericScale];
if (DBNull.Value == temp) {
scale = SmiMetaData.DefaultDecimal.Scale;
}
else {
scale = Convert.ToByte(temp, null);
}
if (precision < SmiMetaData.MinPrecision ||
precision > SqlDecimal.MaxPrecision ||
scale < SmiMetaData.MinScale ||
scale > SqlDecimal.MaxScale ||
scale > precision) {
throw SQL.InvalidColumnPrecScale();
}
break;
case SqlDbType.Time:
case SqlDbType.DateTime2:
case SqlDbType.DateTimeOffset:
// requires scale
temp = schemaRow[SchemaTableColumn.NumericScale];
if (DBNull.Value == temp) {
scale = SmiMetaData.DefaultTime.Scale;
}
else {
scale = Convert.ToByte(temp, null);
}
if (scale > SmiMetaData.MaxTimeScale) {
throw SQL.InvalidColumnPrecScale();
}
else if (scale < 0) {
scale = SmiMetaData.DefaultTime.Scale;
}
break;
case SqlDbType.Udt:
case SqlDbType.Structured:
default:
// These types are not supported from SchemaTable
throw SQL.UnsupportedColumnTypeForSqlProvider(colName, colType.ToString());
}
return new SmiExtendedMetaData(
colDbType,
maxLength,
precision,
scale,
System.Globalization.CultureInfo.CurrentCulture.LCID,
SmiMetaData.GetDefaultForType(colDbType).CompareOptions,
null, // no support for UDTs from SchemaTable
false, // no support for multi-valued columns in a TVP yet
null, // no support for structured columns yet
null, // no support for structured columns yet
colName,
null,
null,
null);
}
}
}
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