下表展示了所有支持的YashanDB 外部数据类型：

外部数据类型标识符	外部数据类型定义	实际外部数据类型定义结构
YAC_SQLT_BOOL	YacBool	bool
YAC_SQLT_TINYINT	YacInt8	signed char
YAC_SQLT_SMALLINT	YacInt16	short
YAC_SQLT_INTEGER	YacInt32	int
YAC_SQLT_BIGINT	YacInt64	long long
YAC_SQLT_FLOAT	YacFloat	float
YAC_SQLT_DOUBLE	YacDouble	double
YAC_SQLT_NUMBER	YacNumber	#define YAC_NUMBER_SIZE 20 typedef struct StYacNumber { unsigned char numberPart[YAC_NUMBER_SIZE]; } YacNumber;
YAC_SQLT_DATE	YacDate	long long
YAC_SQLT_SHORTTIME	YacShortTime	long long
YAC_SQLT_TIMESTAMP	YacTimestamp	#define YAC_TIMESTAMP_SIZE 12 typedef struct StYacTimestamp { unsigned char timestampPart[YAC_TIMESTAMP_SIZE]; } YacTimestamp;
YAC_SQLT_YM_INTERVAL	YacYMInterval	int
YAC_SQLT_DS_INTERVAL	YacDSInterval	long long
YAC_SQLT_CHAR	YacChar*	char*
YAC_SQLT_VARCHAR	YacChar*	char*
YAC_SQLT_BINARY	YacChar*	char*
YAC_SQLT_CLOB	YacLobLocator	内部结构
YAC_SQLT_BLOB	YacLobLocator	内部结构
YAC_SQLT_NCLOB	YacLobLocator	内部结构
YAC_SQLT_BIT	YacChar*	char*
YAC_SQLT_ROWID	YacChar*	#define YAC_ROWID_SIZE 16 typedef struct StYacRowId { unsigned char rowIdPart[YAC_ROWID_SIZE]; } YacRowId;
YAC_SQLT_JSON	YacLobLocator	内部结构
YAC_SQLT_CHAR2	YacChar*	char*
YAC_SQLT_VARCHAR2	YacChar*	char*
YAC_SQLT_BINARY2	YacChar*	char*
YAC_SQLT_CURSOR	YacHandle	void*