[转] SQL和C数据类型的映射

SQL Data Types

PointBase supports the following data types for its column and parameter declarations.

• CHARACTER [(length)] or CHAR [(length)]
• VARCHAR (length)
• BOOLEAN
• SMALLINT
• INTEGER or INT
• DECIMAL [(p[,s])] or DEC [(p[,s])]
• NUMERIC [(p[,s])]
• REAL
• FLOAT(p)
• DOUBLE PRECISION
• DATE
• TIME
• TIMESTAMP
• CLOB [(length)] or CHARACTER LARGE OBJECT [(length)] or CHAR LARGE OBJECT [(length)]
• BLOB [(length)] or BINARY LARGE OBJECT [(length)]

在下表中，介绍了驱动程序将服务器数据类型映射为默认SQL和C数据类型的方法：

值	SQL类型	C类型
bit	SQL_BIT	SQL_C_BIT
tinyint	SQL_TINYINT	SQL_C_STINYINT
tinyint unsigned	SQL_TINYINT	SQL_C_UTINYINT
bigint	SQL_BIGINT	SQL_C_SBIGINT
bigint unsigned	SQL_BIGINT	SQL_C_UBIGINT
long varbinary	SQL_LONGVARBINARY	SQL_C_BINARY
blob	SQL_LONGVARBINARY	SQL_C_BINARY
longblob	SQL_LONGVARBINARY	SQL_C_BINARY
tinyblob	SQL_LONGVARBINARY	SQL_C_BINARY
mediumblob	SQL_LONGVARBINARY	SQL_C_BINARY
long varchar	SQL_LONGVARCHAR	SQL_C_CHAR
text	SQL_LONGVARCHAR	SQL_C_CHAR
mediumtext	SQL_LONGVARCHAR	SQL_C_CHAR
char	SQL_CHAR	SQL_C_CHAR
numeric	SQL_NUMERIC	SQL_C_CHAR
decimal	SQL_DECIMAL	SQL_C_CHAR
integer	SQL_INTEGER	SQL_C_SLONG
integer unsigned	SQL_INTEGER	SQL_C_ULONG
int	SQL_INTEGER	SQL_C_SLONG
int unsigned	SQL_INTEGER	SQL_C_ULONG
mediumint	SQL_INTEGER	SQL_C_SLONG
mediumint unsigned	SQL_INTEGER	SQL_C_ULONG
smallint	SQL_SMALLINT	SQL_C_SSHORT
smallint unsigned	SQL_SMALLINT	SQL_C_USHORT
real	SQL_FLOAT	SQL_C_DOUBLE
double	SQL_FLOAT	SQL_C_DOUBLE
float	SQL_REAL	SQL_C_FLOAT
double precision	SQL_DOUBLE	SQL_C_DOUBLE
date	SQL_DATE	SQL_C_DATE
time	SQL_TIME	SQL_C_TIME
year	SQL_SMALLINT	SQL_C_SHORT
datetime	SQL_TIMESTAMP	SQL_C_TIMESTAMP
timestamp	SQL_TIMESTAMP	SQL_C_TIMESTAMP
text	SQL_VARCHAR	SQL_C_CHAR
varchar	SQL_VARCHAR	SQL_C_CHAR
enum	SQL_VARCHAR	SQL_C_CHAR
set	SQL_VARCHAR	SQL_C_CHAR
bit	SQL_CHAR	SQL_C_CHAR
bool	SQL_CHAR	SQL_C_CHAR