Constructs a hash fingerprint based on the 64-bit bitmap. Set the 64-bit bitmap to a 64-bit long integer as a hash fingerprint.
根据 64 位的比特指纹构造出哈希指纹。将 64 位的比特指纹设置为一个 64 位的长整型作为哈希指纹
For example, if you change a field from Double to Long Integer, decimal numbers are rounded to the nearest whole number.
例如,如果将字段从"双精度"更改为"长整型",小数位将会四舍五入为最接近的整数。
return value Long integer returned after conversion, Otherwise, it returns an error code and ERANGE is stored in errno.
返回值 返回转换后的长整型数,否则返回ERANGE并将错误代码存入errno中。
an unsigned long integer representing the type of access requested
the value range includes string, integer, short integer, long integer, floating single precision, floating double precision, numeric type, date type, and time stamp etc.
取值范围包括字符串、整形、短整、长整、浮点单精度、浮点双精度、数值型、日期型、时间戳等。
return value Long integer returned after conversion.
The size and type of numbers to enter in the field. The most common settings are Double and Long Integer. If this field will be joined to an AutoNumber field in a many-to-one relationship, this setting must be Long Integer.
在此字段所输入数字的类型及大小。最常用的设置为双精确度和长整型。如要将该字段添加到多对一关系中的"自动编号"字段,则该此设置必须为长整型。