C# 数据类型映射 (SQLite,MySQL,MSSQL,Oracle)

一、C# vs SQLite:

C#		SQLite
字段名	类型	库类型	GetFieldType(#)	转换	备注
F_BOOL	bool	BIT NOT NULL	Boolean
F_BOOL_NULL	bool?	BIT	Boolean
F_SBYTE	sbyte	INT8 NOT NULL	SByte	sbyte_
F_SBYTE_NULL	sbyte?	INT8	SByte	sbyte_
F_BYTE	byte	UINT8 NOT NULL	Byte
F_BYTE_NULL	byte?	UINT8	Byte
F_SHORT	short	INT16 NOT NULL	Int16
F_SHORT_NULL	short?	INT16	Int16
F_USHORT	ushort	UINT16 NOT NULL	UInt16	ushort_
F_USHORT_NULL	ushort?	UINT16	UInt16	ushort_
F_INT	int	INT32 NOT NULL	Int32
F_INT_NULL	int?	INT32	Int32
F_UINT	uint	UINT32 NOT NULL	UInt32	uint_
F_UINT_NULL	uint?	UINT32	UInt32	uint_
F_LONG	long	INT64 NOT NULL	Int64
F_LONG_NULL	long?	INT64	Int64
F_ULONG	ulong	UINT64 NOT NULL	UInt64	ulong_
F_ULONG_NULL	ulong?	UINT64	UInt64	ulong_
F_FLOAT	float	FLOAT NOT NULL	Double		不转兼容
F_FLOAT_NULL	float?	FLOAT	Double		不转兼容
F_DOUBLE	double	DOUBLE NOT NULL	Double
F_DOUBLE_NULL	double?	DOUBLE	Double
F_DECIMAL	decimal	DECIMAL NOT NULL	Decimal		存取不一：<F_DECIMAL>: [-79228162514264300000000000000] != [-79228162514264337593543950335]
F_DECIMAL_NULL	decimal?	DECIMAL	Decimal		存取不一：<F_DECIMAL>: [-79228162514264300000000000000] != [-79228162514264337593543950335]
F_CHAR	char	TEXT NOT NULL	String
F_CHAR_NULL	char?	TEXT	String
F_STRING	string	TEXT NOT NULL	String
F_STRING_NULL	string	TEXT	String
F_DATETIME	DateTime	TEXT NOT NULL	String
F_DATETIME_NULL	DateTime?	TEXT	String

二、 C# vs MySQL:

C#		MySQL
字段名	类型	库类型	GetFieldType(#)	转换	备注
F_BOOL	bool	BOOL NOT NULL	Boolean
F_BOOL_NULL	bool?	BOOL NULL	Boolean
F_SBYTE	sbyte	TINYINT NOT NULL	SByte	sbyte_
F_SBYTE_NULL	sbyte?	TINYINT NULL	SByte	sbyte_
F_BYTE	byte	TINYINT UNSIGNED NOT NULL	Byte
F_BYTE_NULL	byte?	TINYINT UNSIGNED NULL	Byte
F_SHORT	short	SMALLINT NOT NULL	Int16
F_SHORT_NULL	short?	SMALLINT NULL	Int16
F_USHORT	ushort	SMALLINT UNSIGNED NOT NULL	UInt16	ushort_
F_USHORT_NULL	ushort?	SMALLINT UNSIGNED NULL	UInt16	ushort_
F_INT	int	INT NOT NULL	Int32
F_INT_NULL	int?	INT NULL	Int32
F_UINT	uint	INT UNSIGNED NOT NULL	UInt32	uint_
F_UINT_NULL	uint?	INT UNSIGNED NULL	UInt32	uint_
F_LONG	long	BIGINT NOT NULL	Int64
F_LONG_NULL	long?	BIGINT NULL	Int64
F_ULONG	ulong	BIGINT UNSIGNED NOT NULL	UInt64	ulong_
F_ULONG_NULL	ulong?	BIGINT UNSIGNED NULL	UInt64	ulong_
F_FLOAT	float	FLOAT NOT NULL	Single		极值溢出
F_FLOAT_NULL	float?	FLOAT NULL	Single		极值溢出
F_DOUBLE	double	DOUBLE NOT NULL	Double
F_DOUBLE_NULL	double?	DOUBLE NULL	Double
F_DECIMAL	decimal	DECIMAL NOT NULL	Decimal		极值溢出
F_DECIMAL_NULL	decimal?	DECIMAL NULL	Decimal		极值溢出
F_CHAR	char	CHARACTER NOT NULL	String		中文报错
F_CHAR_NULL	char?	CHARACTER NULL	String		中文报错
F_STRING	string	VARCHAR(50) NOT NULL	String
F_STRING_NULL	string	VARCHAR(50) NULL	String
F_DATETIME	DateTime	DATETIME NOT NULL	DateTime
F_DATETIME_NULL	DateTime?	DATETIME NULL	DateTime

三、 C# vs MSSQL：

C#		MSSQL
字段名	类型	库类型	GetFieldType(#)	转换	备注
F_BOOL	bool	bit NOT NULL	Boolean
F_BOOL_NULL	bool?	bit NULL	Boolean
F_SBYTE	sbyte	smallint NOT NULL	Int16	sbyte_short
F_SBYTE_NULL	sbyte?	smallint NULL	Int16	sbyte_short
F_BYTE	byte	tinyint NOT NUL;	Byte
F_BYTE_NULL	byte?	tinyint NULL	Byte
F_SHORT	short	smallint NOT NULL	Int16
F_SHORT_NULL	short?	smallint NULL	Int16
F_USHORT	ushort	int NOT NULL	Int32	ushort_int
F_USHORT_NULL	ushort?	int NULL	Int32	ushort_int
F_INT	int	int NOT NULL	Int32
F_INT_NULL	int?	int NULL	Int32
F_UINT	uint	bigint NOT NULL	Int64	uint_long
F_UINT_NULL	uint?	bigint NULL	Int64	uint_long
F_LONG	long	bigint NOT NULL	Int64
F_LONG_NULL	long?	bigint NULL	Int64
F_ULONG	ulong	real NOT NULL	Single	ulong_float
F_ULONG_NULL	ulong?	real NULL	Single	ulong_float
F_FLOAT	float	real NOT NULL	Single
F_FLOAT_NULL	float?	real NULL	Single
F_DOUBLE	double	float NOT NULL	Double
F_DOUBLE_NULL	double?	float NULL	Double
F_DECIMAL	decimal	decimal NOT NULL	Decimal		极值溢出
F_DECIMAL_NULL	decimal?	decimal NULL	Decimal		极值溢出
F_CHAR	char	char(1) NOT NULL	String
F_CHAR_NULL	char?	char(1) NULL	String
F_STRING	string	varchar(50) NOT NULL	F_STRING:
F_STRING_NULL	string	varchar(50) NULL	String
F_DATETIME	DateTime	datetime NOT NULL	DateTime		必须介于 1/1/1753 12:00:00 AM 和 12/31/9999 11:59:59 PM 之间。
F_DATETIME_NULL	DateTime?	datetime NULL	DateTime

四、C# vs Oracle：

C#		Oracle
字段名	类型	库类型	GetFieldType(#)	转换	备注
F_BOOL	bool	CHAR(1) NOT NULL	String	bool_string
F_BOOL_NULL	bool?	CHAR(1)	String	bool_string
F_SBYTE	sbyte	NUMBER(3) NOT NULL	Int16	sbyte_short
F_SBYTE_NULL	sbyte?	NUMBER(3)	Int16	sbyte_short
F_BYTE	byte	NUMBER(3) NOT NULL	Int16	byte_short
F_BYTE_NULL	byte?	NUMBER(3)	Int16	byte_short
F_SHORT	short	NUMBER(5) NOT NULL	Int32	short_int
F_SHORT_NULL	short?	NUMBER(5)	Int32	short_int
F_USHORT	ushort	NUMBER(5) NOT NULL	Int32	ushort_int
F_USHORT_NULL	ushort?	NUMBER(5)	Int32	ushort_int
F_INT	int	NUMBER(10) NOT NULL	Int64	int_long
F_INT_NULL	int?	NUMBER(10)	Int64	int_long
F_UINT	uint	NUMBER(10) NOT NULL	Int64	uint_long
F_UINT_NULL	uint?	NUMBER(10)	Int64	uint_long
F_LONG	long	NUMBER(19) NOT NULL	Decimal	long_decimal
F_LONG_NULL	long?	NUMBER(19)	Decimal	long_decimal
F_ULONG	ulong	NUMBER(19) NOT NULL	Decimal	ulong_decimal
F_ULONG_NULL	ulong?	NUMBER(19)	Decimal	ulong_decimal
F_FLOAT	float	BINARY_FLOAT NOT NULL	Single
F_FLOAT_NULL	float?	BINARY_FLOAT	Single
F_DOUBLE	double	BINARY_DOUBLE NOT NULL	Double		极值溢出
F_DOUBLE_NULL	double?	BINARY_DOUBLE	Double		极值溢出
F_DECIMAL	decimal	DECIMAL(33,3) NOT NULL	Decimal
F_DECIMAL_NULL	decimal?	DECIMAL(33,3)	Decimal
F_CHAR	char	CHAR(1) NOT NULL	String
F_CHAR_NULL	char?	CHAR(1)	String
F_STRING	string	VARCHAR(50) NOT NULL	String		不允许空字符
F_STRING_NULL	string	VARCHAR(50)	String		不允许空字符
F_DATETIME	DateTime	TIMESTAMP NOT NULL	DateTime		大值读取报错
F_DATETIME_NULL	DateTime?	TIMESTAMP	DateTime		大值读取报错

附、类型转换：

using System;
using System.Collections.Generic;
using System.Text;

namespace vJine.Core.ORM {
    public class TypeConverter {

        public class sbyte_ /*: IConverter<sbyte>*/ {
            public static sbyte CONV_Q(object V) {
                return (sbyte)V;
            }
        }

        public class ushort_ /*: IConverter<ushort>*/ {
            public static ushort CONV_Q(object V) {
                return (ushort)V;
            }
        }

        public class uint_ /*: IConverter<uint>*/ {
            public static uint CONV_Q(object V) {
                return (uint)V;
            }
        }

        public class ulong_ /*: IConverter<ulong>*/ {
            public static ulong CONV_Q(object V) {
                return (ulong)V;
            }
        }

        public class bool_string /*: IConverter<bool>*/ {
            public static object CONV_I(object V) {
                if ((bool)V == true) {
                    return "1";
                } else {
                    return "0";
                }
            }

            public static bool CONV_Q(object V) {
                if ((string)V == "1") {
                    return true;
                } else {
                    return false;
                }
            }
        }

        public class sbyte_short /*: IConverter<sbyte>*/ {

            public static object CONV_I(object V) {
                return Convert.ToInt16(V);
            }

            public static sbyte CONV_Q(object V) {
                return Convert.ToSByte(V);
            }
        }

        public class byte_short /*: IConverter<byte>*/ {
            public static object CONV_I(object V) {
                return Convert.ToInt16(V);
            }

            public static byte CONV_Q(object V) {
                return Convert.ToByte(V);
            }
        }

        public class short_int /*: IConverter<short>*/ {
            public static object CONV_I(object V) {
                return Convert.ToInt32(V);
            }

            public static short CONV_Q(object V) {
                return Convert.ToInt16(V);
            }
        }

        public class ushort_int /*: IConverter<ushort>*/ {
            public static object CONV_I(object V, string Name) {
                return Convert.ToInt32(V);
            }

            public static ushort CONV_Q(object V, string Name) {
                return Convert.ToUInt16(V);
            }
        }

        public class int_long /*: IConverter<int>*/ {
            public static object CONV_I(object V) {
                return Convert.ToInt64(V);
            }

            public static int CONV_Q(object V) {
                return Convert.ToInt32(V);
            }
        }

        public class uint_long /*: IConverter<uint>*/ {
            public static object CONV_I(object V) {
                return Convert.ToInt64(V);
            }

            public static uint CONV_Q(object V) {
                return Convert.ToUInt32(V);
            }
        }

        public class long_decimal /*: IConverter<long>*/ {
            public static object CONV_I(object V) {
                return decimal.Parse(V.ToString());
            }

            public static long CONV_Q(object V) {
                return long.Parse(V.ToString());
            }
        }

        public class ulong_float /*: IConverter<ulong>*/ {
            public static object CONV_I(object V) {
                return Convert.ToSingle(V);
            }

            public static ulong CONV_Q(object V) {
                return Convert.ToUInt64(V);
            }
        }

        public class ulong_decimal /*: IConverter<ulong>*/ {
            public static object CONV_I(object V) {
                return decimal.Parse(V.ToString());
            }

            public static ulong CONV_Q(object V) {
                return ulong.Parse(V.ToString());
            }
        }

        public class float_double /*: IConverter<float>*/ {
            public static object CONV_I(object V) {
                return Convert.ToDouble(V);
            }

            public static float CONV_Q(object V) {
                return Convert.ToSingle(V);
            }
        }

        public class char_string /*: IConverter<char>*/ {
            public static object CONV_I(object V) {
                if (V is Char) {
                    return V;
                } else if (V is string) {
                    string chars = (string)V;
                    if (chars == "") {
                        return '';
                    } else {
                        return chars[0];
                    }
                } else {
                    throw new OrmException("Fail To Convert String[{0}] To Char", V);
                }
            }

            public static char CONV_Q(object V) {
                return ((string)V)[0];
            }
        }

        public class DateTime_ /*: IConverter<DateTime>*/ {
            public static object CONV_I(object V) {
                return V;
            }

            public static DateTime CONV_Q(object V) {
                return (DateTime)V;
            }
        }
    }
}