SqlServer数据类型、C#SqlDbType对应关系及转换

// 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;
}