Javascript中的Neo4j：参数未放入查询中

Question

I'm running into trouble when using the neo4j plugin of thingdom . It seems like the plugin is not able to recognize {mlabel} and {mdata} as placeholders. Code and error follows.

Thank you very much!

var query = [
    'CREATE (p:{mlabel} {{mdata}})',
    'RETURN p'
].join('\n');

var params = {
    mlabel : 'person',
    mdata  : {
        name: 'Pete',
        surname: 'Strutton',
        age: 35
    }
};

this.db.query(query, params, function (err, results) {
    if (err) throw err;
    return result;
});

 Error: Invalid input '{': expected whitespace or a label name (line 1, column 11) "CREATE (p:{mlabel} {{mdata}})" ^ at exports.adjustError (C:\\Spree Github Repository\\Phone\\express\\SpreeRouter \\node_modules\\neo4j\\lib\\util.js:71:15) at __$GraphDatabase_prototype_query__20 (C:\\Spree Github Repository\\Phone\\ex press\\SpreeRouter\\node_modules\\neo4j\\lib\\GraphDatabase.js:942:26) at C:\\Spree Github Repository\\Phone\\express\\SpreeRouter\\node_modules\\neo4j\\l ib\\GraphDatabase.js:2:6247 at Object.__g.trampoline.flush (C:\\Spree Github Repository\\Phone\\express\\Spr eeRouter\\node_modules\\neo4j\\lib\\Node.js:2:3552) at Request.___ [as _callback] (C:\\Spree Github Repository\\Phone\\express\\Spre eRouter\\node_modules\\neo4j\\lib\\GraphDatabase.js:2:5602) at Request.self.callback (C:\\Spree Github Repository\\Phone\\express\\SpreeRout er\\node_modules\\neo4j\\node_modules\\request\\request.js:372:22) at Request.emit (events.js:98:17) at Request.<anonymous> (C:\\Spree Github Repository\\Phone\\express\\SpreeRouter \\node_modules\\neo4j\\node_modules\\request\\request.js:1317:14) at Request.emit (events.js:117:20) at IncomingMessage.<anonymous> (C:\\Spree Github Repository\\Phone\\express\\Spr eeRouter\\node_modules\\neo4j\\node_modules\\request\\request.js:1265:12) 

Answer 1

Solution:

You cannot parametrize your query-selectors anywhere. It is only possible on data that you put into your query. The above wouldn't work, but following query would:

var query = [
    'CREATE (p:LABEL {mdata})',
    'RETURN p'
].join('\n').replace('LABEL', label);

var params = {
    mdata  : data
};

this.db.query(query, params, function (err, results) {
    if (err) throw err;
    console.log(results);
    return results[0];
});