How to Safely Store uint64 Values in PostgreSQL\'s int64 Field?
Converting uint64 to int64 for PostgreSQL Storage
To handle the storage of a uint64 value in PostgreSQL, which only supports signed 64-bit integers (BIGINT), a simple type conversion is most effective. This approach preserves the binary representation of the uint64 value while casting it to int64.
Consider the following Go code:
import ( "fmt" ) func main() { i := uint64(0xffffffffffffffff) // Example uint64 value // Cast the uint64 to int64 using a type conversion i2 := int64(i) fmt.Println(i, i2) }
This code outputs:
18446744073709551615 -1
As you can see, the type conversion of the uint64 value (18446744073709551615) to an int64 value (-1) is a success. This is because numeric conversion between uint64 and int64 doesn't alter the memory representation but only the type interpretation.
However, a caveat to note is that if you attempt to convert an untyped integer constant that exceeds the int64 value range, a compile-time error will occur. For example:
i3 := int64(0xffffffffffffffff) // Compile time error!
This error occurs because the constant value 0xffffffffffffffff overflows the int64 value range (0x7fffffffffffffff).
The above is the detailed content of How to Safely Store uint64 Values in PostgreSQL\'s int64 Field?. For more information, please follow other related articles on the PHP Chinese website!

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