tg-knex-query-resolver/scratch/whereParser.js

TeselaGen's Knex based query resolver

var knex = require('knex')({ client: 'pg' });
var parse = require('node-sqlparser').parse;
var qry = knex.select("id", "name").from("user");
var log = require('./log');

var qry2 = knex.where({ id: 1});
console.log(qry2.toString());
// var filter = [
//     { op: "where", args: ["name", "like", "%adam%"]}
// ];

// var filter = [
//     { op: "where", args: ["name", "like", "%adam%"]},
//     { op: "andWhere", args: [{id:3}]}
// ];

// var filter = [
//     { op: "where", args: ["name", "like", "%adam%"]},
//     { op: "orWhere", grp: [
//         { op: "where", args:[{ role: "admin" }]},
//         { op: "andWhere", args: [{ id: 2}]}
//     ]}
// ];

// var filter = [
//     { op: "where", args: ["name", "like", "%adam%"]},
//     { op: "orWhere", grp: [
//         { op: "where", args:[{ role: "admin" }]},
//         { op: "andWhereIn", args: ['id', [1,2,3]]}
//     ]}
// ];

// var qry3 = knex.select("id", "name").from("user")
//             .where("id",1).andWhereIn(function(){
//                 this.select("id").from("access_control").where({id:5});
//             });
// console.log("QRY3: " + qry.toString());

var filter = [
    { op: "where", args: ["name", "like", "%adam%"]},
    { op: "orWhere", grp: [
        { col: "id", op: "whereIn", subqry: [
            { op: "select", args: ["id"]},
            { op: "from", args: ["access_control"]},
            { op: "where", args: [{id: 5}]}
        ]},
        { col: "id", op: "between", subqry: [
            { op: "select", args: ["id"]},
            { op: "from", args: ["access_control"]},
            { op: "where", args: [{id: 5}]}
        ]},
        { op: "andWhere", args:[{ role: "admin" }]}
    ]}
];

resolveFilter(qry, filter);

console.log(qry.toSQL());
var queryAsStr = qry.toString();
console.log(queryAsStr);
log(parse(queryAsStr));

function resolveFilter(qb, filter){

    filter.forEach((op) => {    
        // log("\nQB=========");
        // log(qb);
        // log("\n");
        // log("OP>>>>>>>>>>");
        // log(op);
        if(isDefined(op, "args") && Array.isArray(op.args)){
            qb = qb[op.op].apply(qb, op.args);
        }else if(isDefined(op, "grp") && Array.isArray(op.grp)){
            qb = qb[op.op](function(){ resolveFilter(this, op.grp); });
        }else if(isDefined(op, "subqry") && Array.isArray(op.subqry)){
            qb = qb[op.op](op.col, function(){ resolveFilter(this, op.subqry); });
        }else{
            throw new Error("Unknown operation format: " + op);
        }

        //console.log(qry.toString());
    });

    function isDefined(obj, key){
        return (typeof obj[key] !== 'undefined');
    }
}