您是否知道映射列表或理想情况下.NET标准类或函数将System.Data.DbType枚举选项转换为TSQL＆＃34;字符串＆＃34;对应于指定的SQL Server类型。
// Type: System.Data.DbType
// Assembly: System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
// MVID: CB77DBFA-81C4-4326-93F6-E2EEC5D3C28A
// Assembly location: C:\Windows\Microsoft.NET\Framework\v4.0.30319\System.Data.dll
namespace System.Data
{
/// <summary>
/// Specifies the data type of a field, a property, or a Parameter object of a .NET Framework data provider.
/// </summary>
/// <filterpriority>2</filterpriority>
public enum DbType
{
AnsiString = 0,
Binary = 1,
Byte = 2,
Boolean = 3,
Currency = 4,
Date = 5,
DateTime = 6,
Decimal = 7,
Double = 8,
Guid = 9,
Int16 = 10,
Int32 = 11,
Int64 = 12,
Object = 13,
SByte = 14,
Single = 15,
String = 16,
Time = 17,
UInt16 = 18,
UInt32 = 19,
UInt64 = 20,
VarNumeric = 21,
AnsiStringFixedLength = 22,
StringFixedLength = 23,
Xml = 25,
DateTime2 = 26,
DateTimeOffset = 27,
}
}
示例：
DbType.Int32 -> INT
DbType.AnsiString -> VARCHAR
DbType.String -> NVARCHAR
DbType.Guid -> UNIQUEIDENTIFIER
感谢您的帮助。
答案 0 :(得分：0)
这里我写过一些代码行：
public enum Recurring_DayOfWeek
{
Sunday = 2,
Monday = 4,
Tuesday = 8,
Wednesday = 16,
Thursday = 32,
Friday = 64,
Saturday = 128
}
Req_Param是Enum的描述，但是如果你没有描述可行，那么在EnumHelper中我会留下例子....
System.Data.SqlDbType sqlDatatype = (System.Data.SqlDbType)Enum.Parse(typeof(System.Data.SqlDbType), EnumHelper.EnumDescription(Req_Param), true);
using System.ComponentModel;
public static class EnumHelper
{
public enum Speed
{
[Description("5 metters per second")]
Five = 5,
[Description("10 metters per second")]
Ten = 10,
[Description("15 metters per second")]
Fifteen = 15,
[Description("20 metters per second")]
Twenty = 20,
//[Description("25 metters per second")]
TwentyFive = 25,
[Description("30 metters per second")]
Thirty = 30
}
/// <summary>
/// get the string value of Enum Attribute
/// </summary>
/// <param name="EnumConstant"></param>
/// <returns>
/// string enumDesctiption = EnumHelper.EnumDescription(EnumHelper.Speed.Thirty);
/// enumDesctiption = EnumHelper.EnumDescription(DayOfWeek.Monday); when there is no desc returns as string the ENUM property
/// </returns>
public static string EnumDescription(Enum EnumConstant)
{
System.Reflection.FieldInfo fi = EnumConstant.GetType().GetField(EnumConstant.ToString());
DescriptionAttribute[] aattr = (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
if (aattr.Length > 0)
{
return aattr[0].Description;
}
else
{
return EnumConstant.ToString();
}
}
}
小心BIT和验证C＃，VB.NET＆lt; - ＆gt; SQL
答案 1 :(得分：0)
我无法记住从哪里获得此信息，但我会将其发布以供将来参考。
namespace CodeInsiders.SharpQL
{
using System;
using System.Collections.Generic;
using System.Data;
public static class SqlMapper
{
private static readonly Dictionary<DbType, Type> DbTypeMapToNullableType = new Dictionary<DbType, Type>
{
{ DbType.Byte, typeof(byte?) },
{ DbType.SByte, typeof(sbyte?) },
{ DbType.Int16, typeof(short?) },
{ DbType.UInt16, typeof(ushort?) },
{ DbType.Int32, typeof(int?) },
{ DbType.UInt32, typeof(uint?) },
{ DbType.Int64, typeof(long?) },
{ DbType.UInt64, typeof(ulong?) },
{ DbType.Single, typeof(float?) },
{ DbType.Double, typeof(double?) },
{ DbType.Decimal, typeof(decimal?) },
{ DbType.Boolean, typeof(bool?) },
{ DbType.StringFixedLength, typeof(char?) },
{ DbType.Guid, typeof(Guid?) },
{ DbType.DateTime, typeof(DateTime?) },
{ DbType.DateTimeOffset, typeof(DateTimeOffset?) },
{ DbType.Binary, typeof(byte[]) }
};
private static readonly Dictionary<DbType, Type> DbTypeMapToType = new Dictionary<DbType, Type>
{
{ DbType.Byte, typeof(byte) },
{ DbType.SByte, typeof(sbyte) },
{ DbType.Int16, typeof(short) },
{ DbType.UInt16, typeof(ushort) },
{ DbType.Int32, typeof(int) },
{ DbType.UInt32, typeof(uint) },
{ DbType.Int64, typeof(long) },
{ DbType.UInt64, typeof(ulong) },
{ DbType.Single, typeof(float) },
{ DbType.Double, typeof(double) },
{ DbType.Decimal, typeof(decimal) },
{ DbType.Boolean, typeof(bool) },
{ DbType.String, typeof(string) },
{ DbType.StringFixedLength, typeof(char) },
{ DbType.Guid, typeof(Guid) },
{ DbType.DateTime, typeof(DateTime) },
{ DbType.DateTimeOffset, typeof(DateTimeOffset) },
{ DbType.Binary, typeof(byte[]) }
};
private static readonly Dictionary<SqlDbType, Type> SqlDbTypeToNullableType = new Dictionary<SqlDbType, Type>
{
{ SqlDbType.BigInt, typeof(long?) },
{ SqlDbType.Binary, typeof(byte[]) },
{ SqlDbType.Image, typeof(byte[]) },
{ SqlDbType.Timestamp, typeof(byte[]) },
{ SqlDbType.VarBinary, typeof(byte[]) },
{ SqlDbType.Bit, typeof(bool?) },
{ SqlDbType.Char, typeof(string) },
{ SqlDbType.NChar, typeof(string) },
{ SqlDbType.NText, typeof(string) },
{ SqlDbType.NVarChar, typeof(string) },
{ SqlDbType.Text, typeof(string) },
{ SqlDbType.VarChar, typeof(string) },
{ SqlDbType.Xml, typeof(string) },
{ SqlDbType.DateTime, typeof(DateTime?) },
{ SqlDbType.SmallDateTime, typeof(DateTime?) },
{ SqlDbType.Date, typeof(DateTime?) },
{ SqlDbType.Time, typeof(DateTime?) },
{ SqlDbType.DateTime2, typeof(DateTime?) },
{ SqlDbType.Decimal, typeof(decimal?) },
{ SqlDbType.Money, typeof(decimal?) },
{ SqlDbType.SmallMoney, typeof(decimal?) },
{ SqlDbType.Float, typeof(double?) },
{ SqlDbType.Int, typeof(int?) },
{ SqlDbType.Real, typeof(float?) },
{ SqlDbType.UniqueIdentifier, typeof(Guid?) },
{ SqlDbType.SmallInt, typeof(short?) },
{ SqlDbType.TinyInt, typeof(byte?) },
{ SqlDbType.Variant, typeof(object) },
{ SqlDbType.Udt, typeof(object) },
{ SqlDbType.Structured, typeof(DataTable) },
{ SqlDbType.DateTimeOffset, typeof(DateTimeOffset) }
};
private static readonly Dictionary<SqlDbType, Type> SqlDbTypeToType = new Dictionary<SqlDbType, Type>
{
{ SqlDbType.BigInt, typeof(long) },
{ SqlDbType.Binary, typeof(byte[]) },
{ SqlDbType.Image, typeof(byte[]) },
{ SqlDbType.Timestamp, typeof(byte[]) },
{ SqlDbType.VarBinary, typeof(byte[]) },
{ SqlDbType.Bit, typeof(bool) },
{ SqlDbType.Char, typeof(string) },
{ SqlDbType.NChar, typeof(string) },
{ SqlDbType.NText, typeof(string) },
{ SqlDbType.NVarChar, typeof(string) },
{ SqlDbType.Text, typeof(string) },
{ SqlDbType.VarChar, typeof(string) },
{ SqlDbType.Xml, typeof(string) },
{ SqlDbType.DateTime, typeof(DateTime) },
{ SqlDbType.SmallDateTime, typeof(DateTime) },
{ SqlDbType.Date, typeof(DateTime) },
{ SqlDbType.Time, typeof(DateTime) },
{ SqlDbType.DateTime2, typeof(DateTime) },
{ SqlDbType.Decimal, typeof(decimal) },
{ SqlDbType.Money, typeof(decimal) },
{ SqlDbType.SmallMoney, typeof(decimal) },
{ SqlDbType.Float, typeof(double) },
{ SqlDbType.Int, typeof(int) },
{ SqlDbType.Real, typeof(float) },
{ SqlDbType.UniqueIdentifier, typeof(Guid) },
{ SqlDbType.SmallInt, typeof(short) },
{ SqlDbType.TinyInt, typeof(byte) },
{ SqlDbType.Variant, typeof(object) },
{ SqlDbType.Udt, typeof(object) },
{ SqlDbType.Structured, typeof(DataTable) },
{ SqlDbType.DateTimeOffset, typeof(DateTimeOffset) }
};
private static readonly Dictionary<Type, DbType> TypeToDbType = 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(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
},
};
public static Type ToClrType(this DbType dbType) {
Type type;
if (DbTypeMapToType.TryGetValue(dbType, out type)) {
return type;
}
throw new ArgumentOutOfRangeException("dbType", dbType, "Cannot map the DbType to Type");
}
public static Type ToClrType(this SqlDbType sqlDbType) {
Type type;
if (SqlDbTypeToType.TryGetValue(sqlDbType, out type)) {
return type;
}
throw new ArgumentOutOfRangeException("sqlDbType", sqlDbType, "Cannot map the SqlDbType to Type");
}
public static DbType ToDbType(this Type type) {
DbType dbType;
if (TypeToDbType.TryGetValue(type, out dbType)) {
return dbType;
}
throw new ArgumentOutOfRangeException("type", type, "Cannot map the Type to DbType");
}
public static Type ToNullableClrType(this DbType dbType) {
Type type;
if (DbTypeMapToNullableType.TryGetValue(dbType, out type)) {
return type;
}
throw new ArgumentOutOfRangeException("dbType", dbType, "Cannot map the DbType to Nullable Type");
}
public static Type ToNullableClrType(this SqlDbType sqlDbType) {
Type type;
if (SqlDbTypeToNullableType.TryGetValue(sqlDbType, out type)) {
return type;
}
throw new ArgumentOutOfRangeException("sqlDbType", sqlDbType, "Cannot map the SqlDbType to Nullable Type");
}
}
}