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Zero/ZeroLevel.SQL/DbTypeMapper.cs

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using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
namespace ZeroLevel.SqlServer
{
public static class DbTypeMapper
{
static Dictionary<Type, DbType> typeMap;
static DbTypeMapper()
{
typeMap = new Dictionary<Type, DbType>
{
[typeof(byte)] = DbType.Byte,
[typeof(sbyte)] = DbType.SByte,
[typeof(short)] = DbType.Int16,
[typeof(ushort)] = DbType.UInt16,
[typeof(int)] = DbType.Int32,
[typeof(uint)] = DbType.UInt32,
[typeof(long)] = DbType.Int64,
[typeof(ulong)] = DbType.UInt64,
[typeof(float)] = DbType.Single,
[typeof(double)] = DbType.Double,
[typeof(decimal)] = DbType.Decimal,
[typeof(bool)] = DbType.Boolean,
[typeof(string)] = DbType.String,
[typeof(char)] = DbType.StringFixedLength,
[typeof(Guid)] = DbType.Guid,
[typeof(DateTime)] = DbType.DateTime,
[typeof(DateTimeOffset)] = DbType.DateTimeOffset,
[typeof(TimeSpan)] = DbType.Time,
[typeof(byte[])] = DbType.Binary,
[typeof(byte?)] = DbType.Byte,
[typeof(sbyte?)] = DbType.SByte,
[typeof(short?)] = DbType.Int16,
[typeof(ushort?)] = DbType.UInt16,
[typeof(int?)] = DbType.Int32,
[typeof(uint?)] = DbType.UInt32,
[typeof(long?)] = DbType.Int64,
[typeof(ulong?)] = DbType.UInt64,
[typeof(float?)] = DbType.Single,
[typeof(double?)] = DbType.Double,
[typeof(decimal?)] = DbType.Decimal,
[typeof(bool?)] = DbType.Boolean,
[typeof(char?)] = DbType.StringFixedLength,
[typeof(Guid?)] = DbType.Guid,
[typeof(DateTime?)] = DbType.DateTime,
[typeof(DateTimeOffset?)] = DbType.DateTimeOffset,
[typeof(TimeSpan?)] = DbType.Time,
[typeof(object)] = DbType.Object
};
}
/// <summary>
/// Для value типов помеченных как Nullable вытаскивает оригинальный value тип
/// Не value и не nullable типы не преобразуются
/// </summary>
private static Type GetNonNullableType(Type t)
{
if (t.IsValueType)
{
// Detect Nullable<T>
if (Nullable.GetUnderlyingType(t) != null)
{
return t.GenericTypeArguments.Length > 0 ? t.GenericTypeArguments[0] : t;
}
}
return t;
}
public static DbType ToDbType(this Type type)
{
DbType dbType;
var theType = GetNonNullableType(type);
if (theType.IsEnum && !typeMap.ContainsKey(type))
{
theType = Enum.GetUnderlyingType(theType);
}
if (typeMap.TryGetValue(theType, out dbType))
{
return dbType;
}
return DbType.Object;
}
public static SqlDbType ToSqlDbType(this Type testType)
{
var theType = GetNonNullableType(testType);
if (theType.IsEnum)
{
return Enum.GetUnderlyingType(theType).ToSqlDbType();
}
if (theType == typeof(Byte[]) || theType == typeof(byte[])) return SqlDbType.Image;
if (theType == typeof(UInt16) || theType == typeof(ushort)) return SqlDbType.Int;
if (theType == typeof(UInt32) || theType == typeof(uint)) return SqlDbType.BigInt;
if (theType == typeof(UInt64) || theType == typeof(ulong)) return SqlDbType.Decimal;
if (theType == typeof(TimeSpan)) return SqlDbType.Time;
return new SqlParameter() { DbType = (DbType)Enum.Parse(typeof(DbType), theType.Name) }.SqlDbType;
}
public static Type ToClrType(string sqlType)
{
switch (sqlType.Trim().ToLowerInvariant())
{
case "bigint":
return typeof(long);
case "binary":
case "image":
case "timestamp":
case "varbinary":
return typeof(byte[]);
case "bit":
return typeof(bool);
case "char":
case "nchar":
case "ntext":
case "nvarchar":
case "text":
case "varchar":
case "xml":
return typeof(string);
case "datetime":
case "smalldatetime":
case "date":
case "datetime2":
return typeof(DateTime);
case "time":
return typeof(TimeSpan);
case "decimal":
case "money":
case "smallmoney":
return typeof(decimal);
case "float":
return typeof(double);
case "int":
return typeof(int);
case "real":
return typeof(float);
case "uniqueidentifier":
return typeof(Guid);
case "smallint":
return typeof(short);
case "tinyint":
return typeof(byte);
case "variant":
case "udt":
return typeof(object);
case "structured":
return typeof(DataTable);
case "datetimeoffset":
return typeof(DateTimeOffset);
default:
throw new ArgumentOutOfRangeException(sqlType);
}
}
}
}

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