BigIntAsNullableSqlInt64 do transform a big.Int into an int64 object that nullable in the underlying database, if the pointer is NIL, it will be NULL.

BooleanAsSqlNullableBoolean do transform a boolean into a boolean object that nullable in the underlying database, if the boolean value is FALSE, it will be NULL.

JsonAsSqlNullableString do transform an object into a string that nullable in the underlying database.

StringAsSqlNullableString do transform a string into a string object that nullable in the underlying database, if the string is empty, it will be NULL.

ToPostgresArray transforms the input array into array in underlying database.

Utf8StringAsSqlNullableString receives a string, then remove invalid UTF characters and then transform the string into a string object that nullable in the underlying database, if the string is empty, it will be NULL.