怕忘记了，简单做个备份
参考博客 https://blog.csdn.net/shenzhibiao/article/details/102665931
load方法：
LOAD CSV WITH HEADERS FROM “file:///book.csv” AS line
CREATE (b:Book{book_id:toInteger(line.book_id),title:line.title,original_publication_year:toInteger(line.original_publication_year),average_rating:toFloat(line.average_rating),language_code:line.language_code,alias:line.alias})
LOAD CSV WITH HEADERS FROM “file:///author1.csv” AS line
CREATE (a:Author{author_id:toInteger(line.author_id),author_name:line.author_name})
LOAD CSV WITH HEADERS FROM “file:///book2genre.csv” AS line
match (from:Book{book_id:toInteger(line.book_id)}),(to:Genre{genre_id:toInteger(line.genre_id)})
merge (from)-[r:belong_to{pro:line.rela}]->(to)
