C#等效的SQL Server数据类型
Geo*_*ker 551 .net c# sql-server
对于以下SQL Server数据类型,C#中相应的数据类型是什么？
精确的数字
bigint
numeric
bit
smallint
decimal
smallmoney
int
tinyint
money
近似数字
float
real
日期和时间
date
datetimeoffset
datetime2
smalldatetime
datetime
time
字符串
char
varchar
text
Unicode字符串
nchar
nvarchar
ntext
二进制字符串
binary
varbinary
image
其他数据类型
cursor
timestamp
hierarchyid
uniqueidentifier
sql_variant
xml
table
(来源:MSDN)
Örj*_*mte 1024
这适用于SQL Server 2005.SQL Server 2008,SQL Server 2008 R2,SQL Server 2012和SQL Server 2014的表的更新版本.
SQL Server数据类型及其.NET Framework等价物
下表列出了Microsoft SQL Server数据类型,它们在System.Data.SqlTypes命名空间中SQL Server的公共语言运行时(CLR)中的等效项,以及Microsoft .NET Framework中它们的本机CLR等效项.
SQL Server data type CLR data type (SQL Server) CLR data type (.NET Framework)
varbinary SqlBytes, SqlBinary Byte[]
binary SqlBytes, SqlBinary Byte[]
varbinary(1), binary(1) SqlBytes, SqlBinary byte, Byte[]
image None None
varchar None None
char None None
nvarchar(1), nchar(1) SqlChars, SqlString Char, String, Char[]
nvarchar SqlChars, SqlString String, Char[]
nchar SqlChars, SqlString String, Char[]
text None None
ntext None None
uniqueidentifier SqlGuid Guid
rowversion None Byte[]
bit SqlBoolean Boolean
tinyint SqlByte Byte
smallint SqlInt16 Int16
int SqlInt32 Int32
bigint SqlInt64 Int64
smallmoney SqlMoney Decimal
money SqlMoney Decimal
numeric SqlDecimal Decimal
decimal SqlDecimal Decimal
real SqlSingle Single
float SqlDouble Double
smalldatetime SqlDateTime DateTime
datetime SqlDateTime DateTime
sql_variant None Object
User-defined type(UDT) None user-defined type
table None None
cursor None None
timestamp None None
xml SqlXml None
- .NET中的int与此表中的Int32相同,因此它也是SQL Server中的int. (2认同)
- @yogeshpatel，“ short”（https://docs.microsoft.com/zh-cn/dotnet/csharp/language-reference/keywords/short）等于此清单中的System.Int16。因此，在SQL Server中将为smallint。 (2认同)
And*_*ijo 13
如果有人正在寻找从/向 C# 和 SQL Server 格式转换的方法，这里有一个简单的实现：
private readonly string[] SqlServerTypes = { "bigint", "binary", "bit", "char", "date", "datetime", "datetime2", "datetimeoffset", "decimal", "filestream", "float", "geography", "geometry", "hierarchyid", "image", "int", "money", "nchar", "ntext", "numeric", "nvarchar", "real", "rowversion", "smalldatetime", "smallint", "smallmoney", "sql_variant", "text", "time", "timestamp", "tinyint", "uniqueidentifier", "varbinary", "varchar", "xml" };
private readonly string[] CSharpTypes = { "long", "byte[]", "bool", "char", "DateTime", "DateTime", "DateTime", "DateTimeOffset", "decimal", "byte[]", "double", "Microsoft.SqlServer.Types.SqlGeography", "Microsoft.SqlServer.Types.SqlGeometry", "Microsoft.SqlServer.Types.SqlHierarchyId", "byte[]", "int", "decimal", "string", "string", "decimal", "string", "Single", "byte[]", "DateTime", "short", "decimal", "object", "string", "TimeSpan", "byte[]", "byte", "Guid", "byte[]", "string", "string" };
public string ConvertSqlServerFormatToCSharp(string typeName)
{
var index = Array.IndexOf(SqlServerTypes, typeName);
return index > -1
? CSharpTypes[index]
: "object";
}
public string ConvertCSharpFormatToSqlServer(string typeName)
{
var index = Array.IndexOf(CSharpTypes, typeName);
return index > -1
? SqlServerTypes[index]
: null;
}
编辑：修正错别字
- 您的方法 ConvertCSharpFormatToSqlServer 将始终仅返回找到的第一个实例，因为 CSharp 类型不是唯一的，即“byte[]”将始终返回“二进制”，即使它映射到 5 个其他 Sql Server 类型。 (2认同)
小智 7
SQL Server和.NET Framework基于不同类型的系统.例如,.NET Framework Decimal结构的最大比例为28,而SQL Server十进制和数字数据类型的最大比例为38.单击此处为链接!细节
https://msdn.microsoft.com/en-us/library/cc716729(v=vs.110).aspx
- 倾向于答案的不是我,但理想情况下你应该回答这个问题,而不是提供与之相关的链接. (7认同)
public static string FromSqlType(string sqlTypeString)
{
if (! Enum.TryParse(sqlTypeString, out Enums.SQLType typeCode))
{
throw new Exception("sql type not found");
}
switch (typeCode)
{
case Enums.SQLType.varbinary:
case Enums.SQLType.binary:
case Enums.SQLType.filestream:
case Enums.SQLType.image:
case Enums.SQLType.rowversion:
case Enums.SQLType.timestamp://?
return "byte[]";
case Enums.SQLType.tinyint:
return "byte";
case Enums.SQLType.varchar:
case Enums.SQLType.nvarchar:
case Enums.SQLType.nchar:
case Enums.SQLType.text:
case Enums.SQLType.ntext:
case Enums.SQLType.xml:
return "string";
case Enums.SQLType.@char:
return "char";
case Enums.SQLType.bigint:
return "long";
case Enums.SQLType.bit:
return "bool";
case Enums.SQLType.smalldatetime:
case Enums.SQLType.datetime:
case Enums.SQLType.date:
case Enums.SQLType.datetime2:
return "DateTime";
case Enums.SQLType.datetimeoffset:
return "DateTimeOffset";
case Enums.SQLType.@decimal:
case Enums.SQLType.money:
case Enums.SQLType.numeric:
case Enums.SQLType.smallmoney:
return "decimal";
case Enums.SQLType.@float:
return "double";
case Enums.SQLType.@int:
return "int";
case Enums.SQLType.real:
return "Single";
case Enums.SQLType.smallint:
return "short";
case Enums.SQLType.uniqueidentifier:
return "Guid";
case Enums.SQLType.sql_variant:
return "object";
case Enums.SQLType.time:
return "TimeSpan";
default:
throw new Exception("none equal type");
}
}
public enum SQLType
{
varbinary,//(1)
binary,//(1)
image,
varchar,
@char,
nvarchar,//(1)
nchar,//(1)
text,
ntext,
uniqueidentifier,
rowversion,
bit,
tinyint,
smallint,
@int,
bigint,
smallmoney,
money,
numeric,
@decimal,
real,
@float,
smalldatetime,
datetime,
sql_variant,
table,
cursor,
timestamp,
xml,
date,
datetime2,
datetimeoffset,
filestream,
time,
}