Anyone feel like porting this to MySQL? Not everyone uses postgresql. The more formats available the better.
I am working on it for my perl library.
It's quite different from genjix's approach, though. In particular, I want to use triggers to create the chain tree structure. First I wanted to use ideas such as
this one, but I soon realized that with a long chain it would cost a lot of memory.
For instance with 200,000 chained blocks, the tree table would have 40 billion records. With at least 64 bytes per records, that would be about 1 Po, which is silly.
So I'm still thinking of better structures, since I don't quite understand Genjix's.
CREATE TABLE blocks (
hash char(32) binary primary key,
version integer,
hashPrev char(32) binary not null,
hashMerkleRoot char(32) binary not null,
nTime integer unsigned not null,
nBits integer unsigned not null,
nNonce integer unsigned not null,
key (hashMerkleRoot),
key (hashPrev)
);
CREATE TABLE transactions (
hash char(32) binary primary key,
version integer,
lockTime integer unsigned,
);
CREATE TABLE tx_in (
hash char(32) binary,
prevout_hash char(32) binary,
prevout_n integer unsigned,
scriptSig blob,
sequence integer unsigned,
primary key (hash, prevout_hash, prevout_n),
key(hash)
)
CREATE TABLE tx_out (
tx_out_id integer unsigned primary key auto_increment,
hash char(32) binary,
value integer,
scriptPubKey blob,
key (hash)
);
CREATE TABLE Merkle_trees (
root char(32) binary not null,
hash char(32) binary,
idx integer unsigned not null,
primary key (root, idx),
key (root)
);
CREATE TABLE block_tree (
leaf char(32) binary,
node char(32) binary,
length integer unsigned,
PRIMARY KEY (leaf, node)
);
CREATE VIEW view_blocks AS
SELECT
HEX(hash) as hash,
version,
HEX(hashPrev) as hashPrev,
HEX(hashMerkleRoot) as hashMerkleRoot,
nTime,
nBits,
nNonce
FROM blocks;
CREATE VIEW orphan_blocks AS
SELECT a.*
FROM blocks a LEFT JOIN blocks b
ON a.hashPrev = b.hash
WHERE b.hash IS NULL;
CREATE VIEW view_orphan_blocks AS
SELECT view_blocks.*
FROM view_blocks INNER JOIN orphan_blocks
ON view_blocks.hash = HEX(orphan_blocks.hash);
CREATE VIEW view_Merkle_trees AS
SELECT HEX(root) as root, HEX(hash) as hash, idx
FROM Merkle_trees;
CREATE VIEW view_block_tree AS
SELECT HEX(leaf) as leaf, HEX(node) as node, length
FROM block_tree;
CREATE VIEW chain_length AS
SELECT leaf, length FROM block_tree WHERE leaf = node;
CREATE VIEW chain_weight AS
SELECT leaf, SUM(work(target(b.nBits))) as weight
FROM block_tree INNER JOIN blocks
ON block_tree.node = blocks.hash
GROUP BY leaf;
CREATE VIEW longest_chain AS
SELECT leaf, max(length) as length
FROM chain_length;
CREATE VIEW heaviest_chain AS
SELECT leaf, max(weight) as weight
FROM chain_weight;
CREATE FUNCTION target (bits float)
RETURNS REAL DETERMINISTIC
RETURN mod(bits, 0x1000000) * pow( 256, bits div 0x1000000 - 3 );
CREATE TRIGGER update_block_tree AFTER INSERT ON blocks
FOR EACH ROW BEGIN
INSERT INTO block_tree (leaf, node, length)
SELECT new.hash, new.hash, length+1
FROM block_tree WHERE leaf = new.hashPrev;
UPDATE block_tree
SET leaf=new.hash
WHERE leaf=new.hashPrev;
END;
# vim: ft=mysql
