CURSOR/KEY

Sets the cursor at the current key value

Input stack: cursor

Output stack: key

If there is a current key/value pair set in the cursor, the key will be pushed onto the stack.

PumpkinDB> ["1" "2" ASSOC COMMIT] WRITE [CURSOR DUP CURSOR/FIRST DROP CURSOR/KEY] READ
"1"

Allocation

Allocates for values to be put onto the stack

Errors

NoTransaction error if there's no current write transaction

InvalidValue error if the cursor identifier is incorrect or expired

NoValue error if the cursor hasn't been positioned.

Tests

works : ["1" "2" ASSOC COMMIT] WRITE [CURSOR DUP CURSOR/FIRST SWAP CURSOR/KEY "1" EQUAL? AND] READ.
requires_txn : ["1" CURSOR/KEY] TRY UNWRAP 0x08 EQUAL?.
empty_stack : [[CURSOR/KEY] TRY] READ UNWRAP 0x04 EQUAL?.
invalid_cursor : [["1" CURSOR/KEY] READ] TRY UNWRAP 0x03 EQUAL?.

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