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Delphi与各数据库数据类型比较

發布時間：2025/3/15 数据库 21 豆豆

生活随笔收集整理的這篇文章主要介紹了 Delphi与各数据库数据类型比较小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

Delphi數據類型與各數據庫數據類型對比如下表，如有具體說明見表中腳注：

Delphi ?Type	Oracle?Types	SQL?Server ?Types	MySQL? Types?[1]	InterBase ?Types	PostgreSQL ?Types	SQLite? Types
ftSmallint	NUMBER(p,?0)[2]? (p?<?5)	SMALLINT	TINYINT(M)?(M?>?1) SMALLINT	SMALLINT	SMALLINT	TINYINT SMALLINT
ftWord	-	TINYINT	TINYINT(M)?UNSIGNED?(M?>?1) SMALLINT?UNSIGNED YEAR	-	-	-
ftInteger	NUMBER(p,?0)[2] (4?<?p?<?10)	INT	MEDIUMINT MEDIUMINT?UNSIGNED INT	INTEGER	INTEGER	INTEGER INT
ftLargeint	NUMBER(p,?0)[2]? (9?<?p?<?19)	BIGINT	BIT? INT?UNSIGNED BIGINT BIGINT?UNSIGNED	BIGINT	BIGINT	BIGINT
ftFloat	NUMBER(p,?s)[2]? BINARY?FLOAT(FLOAT) BINARY?DOUBLE	DECIMAL(p,?s)[3]? FLOAT REAL	DECIMAL(p,?s)[3]? FLOAT DOUBLE	NUMBER(p,?s)[3]? FLOAT DOUBLE?PRECISION	DECIMAL[3]? REAL DOUBLE?PRECISION	DECIMAL(p,?s)[3] FLOAT DOUBLE?PRECISION
ftBCD	NUMBER(p,?s)[2]? (p?<?15)?and?(s?<?5)	DECIMAL(p,?s)[3]? (p?<?15)?and?(s?<?5)	DECIMAL(p,?s)[3]? (p?<?15)?and?(s?<?5)	DECIMAL(p,?s)[3]? (p?<?15)?and?(s?<?5)	DECIMAL[3]	DECIMAL[3]
ftFMTBcd	NUMBER(p,?s)[2]? (14?<?p?<?39)?and>? (4?<?s?<?39)	DECIMAL(p,?s)? (14?<?p?<?39)?and? (4?<?s?<?39)	DECIMAL(p,?s)[3]? (14?<?p?<?39)?and (4?<?s?<?39)	DECIMAL(p,?s)[3]? (14?<?p?<?19)?and (4?<?s?<?19)	DECIMAL[3]	DECIMAL[3]
ftCurrency	-	MONEY SMALLMONEY	-	-	MONEY	MONEY
?
ftBoolean	-	BIT	TINYINT[4]? BOOL[4]? BOOLEAN[4]	BOOLEAN	BOOLEAN	BOOLEAN
?
ftString	VARCHAR2 NVARCHAR2 VARCHAR CHAR NCHAR RAW[5]? INTERVAL?DAY?TO?SECOND INTERVAL?DAY?TO?MONTH ROWID UROWID	CHAR VARCHAR	CHAR VARCHAR ENUM SET BINARY[6]? VARBINARY[6]	CHAR VARCHAR	CHAR VARCHAR	CHAR VARCHAR
ftWideString	See?note?[7]	NCHAR NVARCHAR	See?note?[7]	See?note?[7]	See?note?[7]	See?note?[7]
ftMemo	LONG Also?see?note?[8]	TEXT NTEXT[9]	TINYTEXT TEXT MEDIUMTEXT LONGTEXT	BLOB?TEXT	TEXT	TEXT CLOB
ftWideMemo	See?note[10]	NTEXT[11]	See?note[10]	See?note[10]	See?note[10]	See?note[10]
ftOraClob	CLOB NCLOB	-	-	-	-	-
?
ftBlob	LONG?RAW	IMAGE	TINYBLOB BLOB MEDIUMBLOB LONGBLOB Spatial?Data?Types	BLOB?BINARY	BYTEA	BLOB
ftOraBlob	BLOB	-	-	-	LARGE?OBJECT	-
ftBytes	-	BINARY TIMESTAMP	BINARY	-	-	-
ftVarBytes	RAW	VARBINARY	VARBINARY	CHAR VARCHAR (CHARSET?=?OCTETS)	-	BINARY VARBINARY
?
ftDate	-	-	DATE	DATE	DATE	DATE
ftDateTime	DATE	DATE	DATETIME	TIMESTAMP	TIMESTAMP	TIMESTAMP DATETIME
ftTime	-	-	TIME	TIME	TIME	TIME
ftTimeStamp	TIMESTAMP TIMESTAMP?WITH?TIMEZONE	-	-	-	-	-
?
ftCursor	REF?CURSOR	-	-	-	REFCURSOR	-
ftGuid	-	UNIQUEIDENTIFIER	-	-	-	-
ftVariant	-	SQL_VARIANT	-	-	-	-
?
NOT?SUPPORTED	BFILE OBJECT XML	CURSOR XML TABLE	-	-	-	-

[1]?–?如果FieldsAsString?選項被設置?True，則除BLOB和TEXT數據類型外，全部做為ftString來處理

[2]?–?Oracle?NUMBER數據類型與Delphi數據類型對應方式:

if?scale?equals?zero,?provider?checks?values?of?the?specific?options?to?choose?the?correct?Delphi?type?in?the?following?order:?

1.1?field?precision?is?less?or?equal?Precision?Smallint?(default?is?4)?-?uses?ftSmallint;
1.2?field?precision?is?less?or?equal?Precision?Integer?(default?is?9)?-?uses?ftInteger;
1.3?field?precision?is?less?or?equal?Precision?LargeInt?(default?is?18)?-?uses?ftLargeint;

if?scale?is?greater?than?zero,?the?appropriate?Delphi?type?is?chosen?using?the?following?sequence?of?rules:.?

2.1?field?precision?is?less?or?equal?PrecisionFloat?(default?is?0)?-?uses?ftFloat;
2.2?EnableBCD?is?True?and?field?precision,?scale?is?less?or?equal?PrecisionBCD?(default?is?14,4)?-?uses?ftBCD;
2.3?EnableFMTBCD?is?True?and?field?precision,?scale?is?less?or?equal?PrecisionFMTBCD?(default?is?38,38)?-?uses?ftFMTBCD;
2.4?uses?ftFloat.

[3]?-?The?appropriate?Delphi?type?is?chosen?using?the?following?sequence?of?rules:

EnableBCD?is?True?and?field?precision,?scale?is?less?or?equal?14,4?-?uses?ftBCD;?

EnableFMTBCD?is?True?-?uses?ftFMTBCD;?

uses?ftFloat.?

[4]?-?If?the?EnableBoolean?option?is?True

[5]?-?If?the?RawAsString?option?is?True

[6]?-?If?the?BinaryAsString?is?True

[7]?-?If?the?UseUnicode?option?is?True,?all?server?types?mapped?to?ftString?will?be?mapped?to?ftWideString.

[8]?-?If?the?LongStrings?option?is?False,?and?the?field?length?is?greater?than?255,?all?server?types?mapped?to?ftString?will?be?mapped?to?ftMemo.

[9]?-?For?all?Delphi?versions?prior?to?BDS?2006.

[10]?-?If?the?UseUnicode?option?is?True,?in?BDS?2006?and?later?versions?all?server?types?mapped?to?ftMemo?will?be?mapped?to?ftWideMemo.

[11]?-?For?BDS?2006?and?higher?IDE?versions.

轉載于:https://www.cnblogs.com/Thenext/p/9951808.html

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