An alpha-level database driver for a new Neo4j remoting protocol.
Note: This is in active development, the API is not stable. Please try it out and give us feedback, but expect things to break in the medium term!
var neo4j = require('build/node/neo4j');A global object neo4j will be available.
<script src="build/browser/neo4j-web.min.js"></script>var statement = ['MERGE (alice:Person {name:{name_a},age:{age_a}})',
'MERGE (bob:Person {name:{name_b},age:{age_b}})',
'CREATE UNIQUE (alice)-[alice_knows_bob:KNOWS]->(bob)',
'RETURN alice, bob, alice_knows_bob'
];
var params = {
name_a: 'Alice',
age_a: 33,
name_b: 'Bob',
age_b: 44
};
// Create a Session object to contain all Cypher activity.
var driver = neo4j.driver("bolt://localhost");
var session = driver.session();
// Run a Cypher statement within an implicit transaction
// The streaming way:
session.run(statement.join(' '), params).subscribe({
onNext: function(record) {
// On receipt of RECORD
for(var i in record) {
console.log(i, ': ', record[i]);
}
}, onCompleted: function() {
session.close();
}, onError: function(error) {
console.log(error);
}
});
// or
// the Promise way, where the complete response is collected:
session.run(statement.join(' '), params)
.then(function(records){
records.forEach(function(record) {
for(var i in record) {
console.log(i, ': ', record[i]);
}
});
session.close();
})
.catch(function(error) {
console.log(error);
});npm install
npm build
This produces browser-compatible standalone files under build/browser and a Node.js module version under build/node.
See files under examples/ on how to use.
./runTests.sh
This runs the test suite against a fresh download of Neo4j.
Or npm test if you already have a running version of a compatible Neo4j server.
For this driver to fully map to the Neo4j type system handling of 64-bits Integers is needed.
Javascript can saftely represent numbers between -(253 - 1) and (253 - 1).
Therefore, an Integer type is introduced.
Number written directly e.g. session.run("CREATE (n:Node {age: {age}})", {age: 22}) will be of type Float in Neo4j.
To write the age as an integer the neo4j.int method should be used.
E.g. session.run("CREATE (n:Node {age: {age}})", {age: neo4j.int(22)}).
To get the value of a from Neo4j received integer, the safeast way would be to use the .toString() method on
an Integer object.
E.g. console.log(result.age.toString()).
To check if a variable is of the Integer type, the method neo4j.isInt(variable) can be used.