writeRecord

writeRecord(handle, object, [offset=0], [length])

Convert DolphinDB objects such as tables or tuples to binary files. The function returns with the number of rows written to handle.

handle is a binary file handle.

object is a table or a tuple with array elements of equal sizes.

offset (optional) specifies the starting row position.

length (optional) indicates the number of rows to be written.

An integer scalar indicating the number of rows written to the file.

t=table(1..10000 as id, 1..10000+100 as value);

f1=file("C:/DolphinDB/a.bin", "w");
f1.writeRecord(t);
// output: 10000

f2=file("C:/DolphinDB/b.bin", "w");
f2.writeRecord(t, 100, 1000);
// output: 1000

f3=file("C:/DolphinDB/c.bin", "w");
f3.writeRecord(t, 100, 10000);
// output: The optional argument length is invalid.