• Sqlserver中数据类型与C#中数据类型转换


    // 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;
    }

    // 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;
    }

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  • 原文地址:https://www.cnblogs.com/guzhengtao/p/16396794.html
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