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  • SQL Server类型与C#类型对应关系[转]

    SQL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;
    }
    }

    代码:
    // 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;
    }
    代码:

    // 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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  • 原文地址:https://www.cnblogs.com/cnwhm/p/4106896.html
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