System.Data.DbType与各类数据库的数据类型的映射关系

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转载最新推荐文章于 2026-04-05 23:32:10 发布 708 阅读 AI 写同款· GEO 优化 ›

C#的数据类型及数据类型的转换一、C#的数据类型 在 C# 中，变量分为以下几种类型：值类型（Value types）引用类型（Reference types）指针类型（Pointer types） 1、值类型（Value types）值类型变量可以直接分配给一个值。它们是从类 System.ValueType 中派生的。值类型直接包含数据。比如 int、char、float，它们分别存储数字、字符、浮点数。当您... 阅读详情

有如下类型的映射对照：

System.Data.SqlClient.SqlDbType
System.Data.OleDb.OleDbType
System.Data.Odbc.OdbcType
System.Data.OracleClient.OracleType
Oracle.ManagedDataAccess.ClientOracleDbType

格式：

DbType.枚举名（枚举值） = DbType.枚举名（枚举值）

1、与 `System.Data.SqlClient.SqlDbType`转换

System.Data.SqlClient.SqlDbType.BigInt(0)  = System.Data.DbType.Int64(12)
System.Data.SqlClient.SqlDbType.Binary(1)  = System.Data.DbType.Binary(1)
System.Data.SqlClient.SqlDbType.Bit(2)  = System.Data.DbType.Boolean(3)
System.Data.SqlClient.SqlDbType.Char(3)  = System.Data.DbType.AnsiStringFixedLength(22)
System.Data.SqlClient.SqlDbType.DateTime(4)  = System.Data.DbType.DateTime(6)
System.Data.SqlClient.SqlDbType.Decimal(5)  = System.Data.DbType.Decimal(7)
System.Data.SqlClient.SqlDbType.Float(6)  = System.Data.DbType.Double(8)
System.Data.SqlClient.SqlDbType.Image(7)  = System.Data.DbType.Binary(1)
System.Data.SqlClient.SqlDbType.Int(8)  = System.Data.DbType.Int32(11)
System.Data.SqlClient.SqlDbType.Money(9)  = System.Data.DbType.Currency(4)
System.Data.SqlClient.SqlDbType.NChar(10)  = System.Data.DbType.StringFixedLength(23)
System.Data.SqlClient.SqlDbType.NText(11)  = System.Data.DbType.String(16)
System.Data.SqlClient.SqlDbType.NVarChar(12)  = System.Data.DbType.String(16)
System.Data.SqlClient.SqlDbType.Real(13)  = System.Data.DbType.Single(15)
System.Data.SqlClient.SqlDbType.UniqueIdentifier(14)  = System.Data.DbType.Guid(9)
System.Data.SqlClient.SqlDbType.SmallDateTime(15)  = System.Data.DbType.DateTime(6)
System.Data.SqlClient.SqlDbType.SmallInt(16)  = System.Data.DbType.Int16(10)
System.Data.SqlClient.SqlDbType.SmallMoney(17)  = System.Data.DbType.Currency(4)
System.Data.SqlClient.SqlDbType.Text(18)  = System.Data.DbType.AnsiString(0)
System.Data.SqlClient.SqlDbType.Timestamp(19)  = System.Data.DbType.Binary(1)
System.Data.SqlClient.SqlDbType.TinyInt(20)  = System.Data.DbType.Byte(2)
System.Data.SqlClient.SqlDbType.VarBinary(21)  = System.Data.DbType.Binary(1)
System.Data.SqlClient.SqlDbType.VarChar(22)  = System.Data.DbType.AnsiString(0)
System.Data.SqlClient.SqlDbType.Variant(23)  = System.Data.DbType.Object(13)
System.Data.SqlClient.SqlDbType.Xml(25)  = System.Data.DbType.Xml(25)
System.Data.SqlClient.SqlDbType.Udt(29)  = System.Data.DbType.Object(13)
System.Data.SqlClient.SqlDbType.Structured(30)  = System.Data.DbType.Object(13)
System.Data.SqlClient.SqlDbType.Date(31)  = System.Data.DbType.Date(5)
System.Data.SqlClient.SqlDbType.Time(32)  = System.Data.DbType.Time(17)
System.Data.SqlClient.SqlDbType.DateTime2(33)  = System.Data.DbType.DateTime2(26)
System.Data.SqlClient.SqlDbType.DateTimeOffset(34)  = System.Data.DbType.DateTimeOffset(27)

2、与 `System.Data.OleDb.OleDbType`转换

System.Data.OleDb.OleDbType.Empty(0)  = System.Data.DbType.Object(13)
System.Data.OleDb.OleDbType.SmallInt(2)  = System.Data.DbType.Int16(10)
System.Data.OleDb.OleDbType.Integer(3)  = System.Data.DbType.Int32(11)
System.Data.OleDb.OleDbType.Single(4)  = System.Data.DbType.Single(15)
System.Data.OleDb.OleDbType.Double(5)  = System.Data.DbType.Double(8)
System.Data.OleDb.OleDbType.Currency(6)  = System.Data.DbType.Currency(4)
System.Data.OleDb.OleDbType.Date(7)  = System.Data.DbType.DateTime(6)
System.Data.OleDb.OleDbType.BSTR(8)  = System.Data.DbType.String(16)
System.Data.OleDb.OleDbType.IDispatch(9)  = System.Data.DbType.Object(13)
System.Data.OleDb.OleDbType.Error(10)  = System.Data.DbType.Int32(11)
System.Data.OleDb.OleDbType.Boolean(11)  = System.Data.DbType.Boolean(3)
System.Data.OleDb.OleDbType.Variant(12)  = System.Data.DbType.Object(13)
System.Data.OleDb.OleDbType.IUnknown(13)  = System.Data.DbType.Object(13)
System.Data.OleDb.OleDbType.Decimal(14)  = System.Data.DbType.Decimal(7)
System.Data.OleDb.OleDbType.TinyInt(16)  = System.Data.DbType.SByte(14)
System.Data.OleDb.OleDbType.UnsignedTinyInt(17)  = System.Data.DbType.Byte(2)
System.Data.OleDb.OleDbType.UnsignedSmallInt(18)  = System.Data.DbType.UInt16(18)
System.Data.OleDb.OleDbType.UnsignedInt(19)  = System.Data.DbType.UInt32(19)
System.Data.OleDb.OleDbType.BigInt(20)  = System.Data.DbType.Int64(12)
System.Data.OleDb.OleDbType.UnsignedBigInt(21)  = System.Data.DbType.UInt64(20)
System.Data.OleDb.OleDbType.Filetime(64)  = System.Data.DbType.DateTime(6)
System.Data.OleDb.OleDbType.Guid(72)  = System.Data.DbType.Guid(9)
System.Data.OleDb.OleDbType.Binary(128)  = System.Data.DbType.Binary(1)
System.Data.OleDb.OleDbType.Char(129)  = System.Data.DbType.AnsiStringFixedLength(22)
System.Data.OleDb.OleDbType.WChar(130)  = System.Data.DbType.StringFixedLength(23)
System.Data.OleDb.OleDbType.Numeric(131)  = System.Data.DbType.Decimal(7)
System.Data.OleDb.OleDbType.DBDate(133)  = System.Data.DbType.Date(5)
System.Data.OleDb.OleDbType.DBTime(134)  = System.Data.DbType.Time(17)
System.Data.OleDb.OleDbType.DBTimeStamp(135)  = System.Data.DbType.DateTime(6)
System.Data.OleDb.OleDbType.PropVariant(138)  = System.Data.DbType.Object(13)
System.Data.OleDb.OleDbType.VarNumeric(139)  = System.Data.DbType.VarNumeric(21)
System.Data.OleDb.OleDbType.VarChar(200)  = System.Data.DbType.AnsiString(0)
System.Data.OleDb.OleDbType.LongVarChar(201)  = System.Data.DbType.AnsiString(0)
System.Data.OleDb.OleDbType.VarWChar(202)  = System.Data.DbType.String(16)
System.Data.OleDb.OleDbType.LongVarWChar(203)  = System.Data.DbType.String(16)
System.Data.OleDb.OleDbType.VarBinary(204)  = System.Data.DbType.Binary(1)
System.Data.OleDb.OleDbType.LongVarBinary(205)  = System.Data.DbType.Binary(1)

3、与`System.Data.Odbc.OdbcType`转换

System.Data.Odbc.OdbcType.BigInt(1)  = System.Data.DbType.Int64(12)
System.Data.Odbc.OdbcType.Binary(2)  = System.Data.DbType.Binary(1)
System.Data.Odbc.OdbcType.Bit(3)  = System.Data.DbType.Boolean(3)
System.Data.Odbc.OdbcType.Char(4)  = System.Data.DbType.AnsiStringFixedLength(22)
System.Data.Odbc.OdbcType.DateTime(5)  = System.Data.DbType.DateTime(6)
System.Data.Odbc.OdbcType.Decimal(6)  = System.Data.DbType.Decimal(7)
System.Data.Odbc.OdbcType.Numeric(7)  = System.Data.DbType.Decimal(7)
System.Data.Odbc.OdbcType.Double(8)  = System.Data.DbType.Double(8)
System.Data.Odbc.OdbcType.Image(9)  = System.Data.DbType.Binary(1)
System.Data.Odbc.OdbcType.Int(10)  = System.Data.DbType.Int32(11)
System.Data.Odbc.OdbcType.NChar(11)  = System.Data.DbType.StringFixedLength(23)
System.Data.Odbc.OdbcType.NText(12)  = System.Data.DbType.String(16)
System.Data.Odbc.OdbcType.NVarChar(13)  = System.Data.DbType.String(16)
System.Data.Odbc.OdbcType.Real(14)  = System.Data.DbType.Single(15)
System.Data.Odbc.OdbcType.UniqueIdentifier(15)  = System.Data.DbType.Guid(9)
System.Data.Odbc.OdbcType.SmallDateTime(16)  = System.Data.DbType.DateTime(6)
System.Data.Odbc.OdbcType.SmallInt(17)  = System.Data.DbType.Int16(10)
System.Data.Odbc.OdbcType.Text(18)  = System.Data.DbType.AnsiString(0)
System.Data.Odbc.OdbcType.Timestamp(19)  = System.Data.DbType.Binary(1)
System.Data.Odbc.OdbcType.TinyInt(20)  = System.Data.DbType.Byte(2)
System.Data.Odbc.OdbcType.VarBinary(21)  = System.Data.DbType.Binary(1)
System.Data.Odbc.OdbcType.VarChar(22)  = System.Data.DbType.AnsiString(0)
System.Data.Odbc.OdbcType.Date(23)  = System.Data.DbType.Date(5)
System.Data.Odbc.OdbcType.Time(24)  = System.Data.DbType.Time(17)

4、与`System.Data.OracleClient.OracleType`转换

System.Data.OracleClient.OracleType.BFile(1)  = System.Data.DbType.Binary(1)
System.Data.OracleClient.OracleType.Blob(2)  = System.Data.DbType.Binary(1)
System.Data.OracleClient.OracleType.Char(3)  = System.Data.DbType.AnsiStringFixedLength(22)
System.Data.OracleClient.OracleType.Clob(4)  = System.Data.DbType.AnsiString(0)
System.Data.OracleClient.OracleType.Cursor(5)  = System.Data.DbType.Object(13)
System.Data.OracleClient.OracleType.DateTime(6)  = System.Data.DbType.DateTime(6)
System.Data.OracleClient.OracleType.IntervalDayToSecond(7)  = System.Data.DbType.Object(13)
System.Data.OracleClient.OracleType.IntervalYearToMonth(8)  = System.Data.DbType.Int32(11)
System.Data.OracleClient.OracleType.LongRaw(9)  = System.Data.DbType.Binary(1)
System.Data.OracleClient.OracleType.LongVarChar(10)  = System.Data.DbType.AnsiString(0)
System.Data.OracleClient.OracleType.NChar(11)  = System.Data.DbType.StringFixedLength(23)
System.Data.OracleClient.OracleType.NClob(12)  = System.Data.DbType.String(16)
System.Data.OracleClient.OracleType.Number(13)  = System.Data.DbType.VarNumeric(21)
System.Data.OracleClient.OracleType.NVarChar(14)  = System.Data.DbType.String(16)
System.Data.OracleClient.OracleType.Raw(15)  = System.Data.DbType.Binary(1)
System.Data.OracleClient.OracleType.RowId(16)  = System.Data.DbType.AnsiString(0)
System.Data.OracleClient.OracleType.Timestamp(18)  = System.Data.DbType.DateTime(6)
System.Data.OracleClient.OracleType.TimestampLocal(19)  = System.Data.DbType.DateTime(6)
System.Data.OracleClient.OracleType.TimestampWithTZ(20)  = System.Data.DbType.DateTime(6)
System.Data.OracleClient.OracleType.VarChar(22)  = System.Data.DbType.AnsiString(0)
System.Data.OracleClient.OracleType.Byte(23)  = System.Data.DbType.Byte(2)
System.Data.OracleClient.OracleType.UInt16(24)  = System.Data.DbType.UInt16(18)
System.Data.OracleClient.OracleType.UInt32(25)  = System.Data.DbType.UInt32(19)
System.Data.OracleClient.OracleType.SByte(26)  = System.Data.DbType.SByte(14)
System.Data.OracleClient.OracleType.Int16(27)  = System.Data.DbType.Int16(10)
System.Data.OracleClient.OracleType.Int32(28)  = System.Data.DbType.Int32(11)
System.Data.OracleClient.OracleType.Float(29)  = System.Data.DbType.Single(15)
System.Data.OracleClient.OracleType.Double(30)  = System.Data.DbType.Double(8)

5、与`Oracle.ManagedDataAccess.ClientOracleDbType`转换

Oracle.ManagedDataAccess.ClientOracleDbType.BFile = System.Data.DbType.Binary(1)
Oracle.ManagedDataAccess.ClientOracleDbType.Blob = 102,
Oracle.ManagedDataAccess.ClientOracleDbType.Byte = 103,
Oracle.ManagedDataAccess.ClientOracleDbType.Char = 104,
Oracle.ManagedDataAccess.ClientOracleDbType.Clob = 105,
Oracle.ManagedDataAccess.ClientOracleDbType.Date = 106,
Oracle.ManagedDataAccess.ClientOracleDbType.Decimal = 107,
Oracle.ManagedDataAccess.ClientOracleDbType.Double = 108,
Oracle.ManagedDataAccess.ClientOracleDbType.Long = 109,
Oracle.ManagedDataAccess.ClientOracleDbType.LongRaw = 110,
Oracle.ManagedDataAccess.ClientOracleDbType.Int16 = 111,
Oracle.ManagedDataAccess.ClientOracleDbType.Int32 = 112,
Oracle.ManagedDataAccess.ClientOracleDbType.Int64 = 113,
Oracle.ManagedDataAccess.ClientOracleDbType.IntervalDS = 114,
Oracle.ManagedDataAccess.ClientOracleDbType.IntervalYM = 115,
Oracle.ManagedDataAccess.ClientOracleDbType.NClob = 116,
Oracle.ManagedDataAccess.ClientOracleDbType.NChar = 117,
Oracle.ManagedDataAccess.ClientOracleDbType.NVarchar2 = 119,
Oracle.ManagedDataAccess.ClientOracleDbType.Raw = 120,
Oracle.ManagedDataAccess.ClientOracleDbType.RefCursor = 121,
Oracle.ManagedDataAccess.ClientOracleDbType.Single = 122,
Oracle.ManagedDataAccess.ClientOracleDbType.TimeStamp = 123,
Oracle.ManagedDataAccess.ClientOracleDbType.TimeStampLTZ = 124,
Oracle.ManagedDataAccess.ClientOracleDbType.TimeStampTZ = 125,
Oracle.ManagedDataAccess.ClientOracleDbType.Varchar2 = 126,
Oracle.ManagedDataAccess.ClientOracleDbType.XmlType = 127,
Oracle.ManagedDataAccess.ClientOracleDbType.BinaryDouble = 132,   
Oracle.ManagedDataAccess.ClientOracleDbType.BinaryFloat = 133,
Oracle.ManagedDataAccess.ClientOracleDbType.Boolean = 134,

从 Stored Procedure 取得资料 - 单一参数

步骤

建立 Stored Procedure
建立对应 Stored Procedure 同名的 Entity Model
以 DbContext.SpEntityModel.FromSqlRaw(sqlScript, sqlParameter) 的方式来取出结果FromSqlRaw 不支援 IQueryable 接上 FirstOrDefault()，所以先透过 AsEnumerable() 再转成 IEnumerable，再取第一笔

Stored Procedure

DROP PROCEDURE IF EXISTS [dbo].[usp_Test];  
GO

CREATE PROCEDURE [dbo].[usp_Test]
    @Id varchar(10)
AS
    SELECT @Id as Id;
GO

using Microsoft.Data.SqlClient;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Linq;

namespace EfCoreStoredProcedure
{
    class Program
    {
        static void Main(string[] args)
        {
            var context = DiFactory.GetService<NorthwindContext>();

            var parameter = new SqlParameter { 
                ParameterName = "@Id",
                DbType =  System.Data.DbType.AnsiString,
                Size = 10,
                Value = "1"
            };
            var result = context.usp_Tests.FromSqlRaw("exec [dbo].[usp_Test] @Id", parameter)
                                // 因为 FromSqlRaw 不支援 IQueryable<T> 接上 FirstOrDefault()，所以先转成 IEnumerable<T>，再取第一笔
                                .AsEnumerable()        
                                .FirstOrDefault();
            Console.WriteLine(result.Id);
        }
    }

    public static class DiFactory
    {
        private static readonly ServiceProvider _provider;

        static DiFactory()
        {
            var _services = new ServiceCollection();

            var configuration = new ConfigurationBuilder()
                                .AddJsonFile("appsettings.json", optional: true)
                                .Build();
            _services.AddSingleton(_ => configuration);

            _services.AddDbContext<NorthwindContext>(
                options =>
                    options.UseSqlServer(configuration.GetConnectionString("DefaultConnection")));

            _provider = _services.BuildServiceProvider();
        }

        public static T GetService<T>()
        {
            return _provider.GetService<T>();
        }
    }

    public class NorthwindContext : DbContext
    {
        public NorthwindContext(DbContextOptions<NorthwindContext> options) : base(options) { }
        public DbSet<usp_Test> usp_Tests { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
        }
    }

    public class usp_Test
    {
        public string Id { get; set; }
    }
}

从 `Stored Procedure` 取得资料 - 一个资料表参数

前置范例

User Defined Table Type

IF type_id('[dbo].[tIdName]') IS NOT NULL
        DROP TYPE [dbo].[tIdName];

CREATE TYPE [dbo].[tIdName] AS TABLE
    (
        [Id] int,
        [Name] nvarchar(10)
    );

Stored Procedure

DROP PROCEDURE IF EXISTS [dbo].[usp_Test];  
GO

CREATE PROCEDURE [dbo].[usp_Test]
    @input [dbo].[tIdName] READONLY
AS
    SELECT * from @input
GO

C#

using Microsoft.Data.SqlClient;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Data;
using System.Linq;

namespace EfCoreStoredProcedure
{
    class Program
    {
        static void Main(string[] args)
        {
            var context = DiFactory.GetService<NorthwindContext>();

            var parameterDataTable = new SqlParameter
            {
                ParameterName = "@input",
                SqlDbType = SqlDbType.Structured,
                TypeName = "[dbo].[tIdName]",
                Value = GenerateDataTable()
            };

            var result = context.usp_Tests.FromSqlInterpolated($"exec [dbo].[usp_Test] {parameterDataTable}")
                                .AsEnumerable();

            foreach (var item in result)
            {
                Console.WriteLine(item.Id);
                Console.WriteLine(item.Name);
            }
        }

        private static DataTable GenerateDataTable()
        {
            var result = new DataTable();
            result.Columns.Add("Id", typeof(int));
            result.Columns.Add("Name", typeof(string));

            var row = result.NewRow();
            row[0] = 1;
            row[1] = "A";
            result.Rows.Add(row);

            row = result.NewRow();
            row[0] = 2;
            row[1] = "B";
            result.Rows.Add(row);

            return result;
        }
    }

    public static class DiFactory
    {
        private static readonly ServiceProvider _provider;

        static DiFactory()
        {
            var _services = new ServiceCollection();

            var configuration = new ConfigurationBuilder()
                                .AddJsonFile("appsettings.json", optional: true)
                                .Build();
            _services.AddSingleton(_ => configuration);

            _services.AddDbContext<NorthwindContext>(
                options =>
                    options.UseSqlServer(configuration.GetConnectionString("DefaultConnection")));

            _provider = _services.BuildServiceProvider();
        }

        public static T GetService<T>()
        {
            return _provider.GetService<T>();
        }
    }

    public class NorthwindContext : DbContext
    {
        public NorthwindContext(DbContextOptions<NorthwindContext> options) : base(options) { }
        public DbSet<usp_Test> usp_Tests { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
        }
    }

    public class usp_Test
    {
        public int Id { get; set; }
        public string Name { get; set; }
    }
}