SQL Server类型与C#类型对应关系--好文要收藏[转载]

综合文章 2015-01-13 6339浏览 收藏本文

开发中遇到实体与数据表的字段映射时,我们需要清楚地知道SQL Server类型与C#类型的一一对应关系,现转载一篇SQL Server类型与C#类型对应关系的文章,具体对应表如下:

SQL Server类型 C#类型
bit bool
tinyint byte
smallint short
int int
bigint long
real float
float double
money decimal
datetime DateTime
char string
varchar string
nchar string
nvarchar string
text string
ntext string
image byte[]
binary byte[]
uniqueidentifier Guid
// SqlDbType转换为C#数据类型
public static Type SqlType2CsharpType(SqlDbType sqlType)
{
switch (sqlType)
{
       case SqlDbType.BigInt:
         return typeof(Int64);
       case SqlDbType.Binary:
         return typeof(Object);
       case SqlDbType.Bit:
         return typeof(Boolean);
       case SqlDbType.Char:
         return typeof(String);
       case SqlDbType.DateTime:
         return typeof(DateTime);
       case SqlDbType.Decimal:
         return typeof(Decimal);
       case SqlDbType.Float:
         return typeof(Double);
       case SqlDbType.Image:
         return typeof(Object);
       case SqlDbType.Int:
         return typeof(Int32);
       case SqlDbType.Money:
         return typeof(Decimal);
       case SqlDbType.NChar:
         return typeof(String);
       case SqlDbType.NText:
         return typeof(String);
       case SqlDbType.NVarChar:
         return typeof(String);
       case SqlDbType.Real:
         return typeof(Single);
       case SqlDbType.SmallDateTime:
         return typeof(DateTime);
       case SqlDbType.SmallInt:
         return typeof(Int16);
       case SqlDbType.SmallMoney:
         return typeof(Decimal);
       case SqlDbType.Text:
         return typeof(String);
       case SqlDbType.Timestamp:
         return typeof(Object);
       case SqlDbType.TinyInt:
         return typeof(Byte);
       case SqlDbType.Udt://自定义的数据类型
         return typeof(Object);
       case SqlDbType.UniqueIdentifier:
         return typeof(Object);
       case SqlDbType.VarBinary:
         return typeof(Object);
       case SqlDbType.VarChar:
         return typeof(String);
       case SqlDbType.Variant:
         return typeof(Object);
       case SqlDbType.Xml:
         return typeof(Object);
       default:
         return null;
}
}
// sql server数据类型(如:varchar)
// 转换为SqlDbType类型
public static SqlDbType SqlTypeString2SqlType(string sqlTypeString)
{
SqlDbType dbType = SqlDbType.Variant;//默认为Object

switch (sqlTypeString)
{
       case "int":
         dbType = SqlDbType.Int;
         break;
       case "varchar":
         dbType = SqlDbType.VarChar;
         break;
       case "bit":
         dbType = SqlDbType.Bit;
         break;
       case "datetime":
         dbType = SqlDbType.DateTime;
         break;
       case "decimal":
         dbType = SqlDbType.Decimal;
         break;
       case "float":
         dbType = SqlDbType.Float;
         break;
       case "image":
         dbType = SqlDbType.Image;
         break;
       case "money":
         dbType = SqlDbType.Money;
         break;
       case "ntext":
         dbType = SqlDbType.NText;
         break;
       case "nvarchar":
         dbType = SqlDbType.NVarChar;
         break;
       case "smalldatetime":
         dbType = SqlDbType.SmallDateTime;
         break;
       case "smallint":
         dbType = SqlDbType.SmallInt;
         break;
       case "text":
         dbType = SqlDbType.Text;
         break;
       case "bigint":
         dbType = SqlDbType.BigInt;
         break;
       case "binary":
         dbType = SqlDbType.Binary;
         break;
       case "char":
         dbType = SqlDbType.Char;
         break;
       case "nchar":
         dbType = SqlDbType.NChar;
         break;
       case "numeric":
         dbType = SqlDbType.Decimal;
         break;
       case "real":
         dbType = SqlDbType.Real;
         break;
       case "smallmoney":
         dbType = SqlDbType.SmallMoney;
         break;
       case "sql_variant":
         dbType = SqlDbType.Variant;
         break;
       case "timestamp":
         dbType = SqlDbType.Timestamp;
         break;
       case "tinyint":
         dbType = SqlDbType.TinyInt;
         break;
       case "uniqueidentifier":
         dbType = SqlDbType.UniqueIdentifier;
         break;
       case "varbinary":
         dbType = SqlDbType.VarBinary;
         break;
       case "xml":
         dbType = SqlDbType.Xml;
         break;
}
return dbType;
}
 
// sql server中的数据类型,转换为C#中的类型类型
public static Type SqlTypeString2CsharpType(string sqlTypeString)
{
SqlDbType dbTpe = SqlTypeString2SqlType(sqlTypeString);

return SqlType2CsharpType(dbTpe);
}

// 将sql server中的数据类型,转化为C#中的类型的字符串
public static string SqlTypeString2CsharpTypeString(string sqlTypeString)
{
Type type = SqlTypeString2CsharpType(sqlTypeString);

return type.Name;
}
 

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