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etl-db.js
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etl-db.js
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"use strict";
var mysql = require('mysql');
var settings = require('./conf/settings.js');
var squel = require ('squel');
var _ = require('underscore');
module.exports = function() {
var service = {};
var pool = mysql.createPool(settings.mysqlPoolSettings);
var getServerConnection = function(connectHandler) {
pool.getConnection(function(err, connection) {
if (err) {
console.log('Error While connecting to the database', err);
return connectHandler(err, null);
}
return connectHandler(null, connection);
});
};
//order=columname|asc,columnName|desc
var getSortOrder = function(param) {
if(!param) return null;
var parts;
var order = [];
_.each(param.split(','),function(order_by) {
parts = order_by.split('|');
order.push({column:parts[0],asc:(parts[1].toLowerCase() === "asc")});
})
return order;
}
var getFilters = function(filters) {
var s="";
var vals = [],column;
_.each(filters,function(item) {
column = item.column;
for(var f in item.filters) {
if(item.filters[f] === undefined || item.filters[f] === null || item.filters[f] === "") continue;
console.log(item.filters[f]);
s += column;
if(f === "start") s += " >= ?";
else if(f === "end") s += " <= ?";
else s+= " like ?"
vals.push(item.filters[f]);
s += " AND "
}
});
s = s.substring(0, s.length-5)
if(s !== "")
s = "(" + s + ")";
console.log(s);
console.log(vals);
return {s:s,vals:vals};
}
var queryLimit = 300;
var queryOffset = 0;
service.queryServer = function(queryParts, callback) {
var result = {};
var sql = queryParts.sql;
var values = queryParts.values;
// var queryHandler = queryParts.callback;
console.log('Sql query', sql);
getServerConnection(function(err, connection) {
if (err) return queryHandler(err, null);
connection.query(sql, values, function(err, rows, fields) {
if(err) {
result.errorMessage = "Error querying server"
result.error = err;
}
else {
result.startIndex = queryOffset;
result.size = rows.length;
result.result = rows;
}
// queryHandler(err, result);
callback(result);
connection.release();
});
});
};
service.queryServer_test = function(queryParts, callback) {
var result = {};
var tableAlias='t1';
if(queryParts['alias'])tableAlias=queryParts['alias'];
var s = squel.select()
.from(queryParts['table'],tableAlias);
_.each(queryParts['joins'],function(join) {
s.join(join[0],join[1],join[2]);
});
_.each(queryParts['outerJoins'],function(join) {
s.outer_join(join[0],join[1],join[2]);
});
_.each(queryParts['leftOuterJoins'],function(join) {
s.left_outer_join(join[0],join[1],join[2]);
});
if (queryParts.columns && queryParts.columns !== "*" ) {
if(typeof queryParts.columns === "string") {
// if (queryParts.columns.substring(0, 1) === "(")
// queryParts.columns = queryParts.columns.substring(1, -1);
queryParts.columns = queryParts.columns.split(',');
}
var i = 0;
_.each(queryParts.columns, function (columnName) {
if (i === 0 && columnName.substring(0,1) === "(")
s.field(columnName.split("(")[1]);
else if (i === queryParts.columns.length-1)
{
var col = columnName;
var n = columnName.split(")").length-1;
if(n === 1 && !_.contains(col,"("))
s.field(columnName.split(")")[0]);
else s.field(col);
}
else s.field(columnName);
i++;
});
}
if (queryParts.concatColumns && queryParts.concatColumns !== "*" ) {
if(typeof queryParts.concatColumns === "string") {
// if (queryParts.columns.substring(0, 1) === "(")
// queryParts.columns = queryParts.columns.substring(1, -1);
queryParts.concatColumns = queryParts.concatColumns.split(';');
}
var i = 0;
_.each(queryParts.concatColumns, function (columnName) {
if (i === 0 && columnName.substring(0,1) === "(")
s.field(columnName.split("(")[1]);
else if (i === queryParts.concatColumns.length-1)
{
var col = columnName;
var n = columnName.split(")").length-1;
if(n === 1 && !_.contains(col,"("))
s.field(columnName.split(")")[0]);
else s.field(col);
}
else s.field(columnName);
i++;
});
}
s.where.apply(this,queryParts['where']);
_.each(queryParts['order'], function(param) {s.order(param.column, param.asc);});
s.limit(queryParts['limit'] || queryLimit);
s.offset(queryParts['offset'] || queryOffset);
_.each(queryParts['group'],function(col) {s.group(col);});
var q = s.toParam();
console.log(q.text.replace("\\",""));
console.log(q.values);
var sql = q.text.replace("\\","");
var values = q.values;
//var queryHandler = params.callback;
getServerConnection(function(err, connection) {
if (err) return queryHandler(err, null);
connection.query(sql, values, function(err, rows, fields) {
if(err) {
result.errorMessage = "Error querying server";
result.error = err;
result.sql=sql;
result.sqlParams=values;
}
else {
result.startIndex = queryParts.offset || queryOffset;
result.size = rows.length;
result.result = rows;
result.sql=sql;
result.sqlParams=values;
}
// queryHandler(err, result);
callback(result);
connection.release();
});
});
// pool.getConnection(function (err, connection) {
// if(err) {
// result.errorMessage = "Database Connection Error";
// result.error = err;
// console.log('Database Connection Error');
// callback(result);
// return;
// }
// connection.query((q.text.replace("\\","")), q.values,
// function (err, rows, fields) {
// connection.release();
// if(err) {
// result.errorMessage = "Error querying server"
// result.error = err;
// }
// else {
// result.startIndex = queryParts.offset || queryOffset;
// result.size = rows.length;
// result.result = rows;
// }
// callback(result);
// });
// });
};
service.ExecuteMultiReport = function(sql,values, callback) {
var result = {};
var tableAlias='t1';
getServerConnection(function(err, connection) {
if (err) return queryHandler(err, null);
connection.query(sql, values, function(err, rows, fields) {
if(err) {
result.errorMessage = "Error querying server";
result.error = err;
result.sql=sql;
result.sqlParams=values;
}
else {
// result.startIndex = queryParts.offset || queryOffset;
result.size = rows.length;
result.result = rows;
result.sql=sql;
result.sqlParams=values;
}
// queryHandler(err, result);
callback(result);
connection.release();
});
});
};
service.reportQueryServer = function(queryParts, callback) {
console.log(queryParts,"current query part")
var result = {};
var tableAlias='t1';
if(queryParts['alias'])tableAlias=queryParts['alias'];
var s = squel.select()
.from(queryParts['table'],tableAlias);
_.each(queryParts['joins'],function(join) {
if (join[3]=='JOIN') s.join(join[0],join[1],join[2]);
if (join[3]=='INNER JOIN') s.join(join[0],join[1],join[2]);
if (join[3]=='OUTER JOIN') s.outer_join(join[0],join[1],join[2]);
if (join[3]=='LEFT OUTER JOIN') s.left_outer_join(join[0],join[1],join[2]);
});
if (queryParts.columns && queryParts.columns !== "*" ) {
if(typeof queryParts.columns === "string") {
// if (queryParts.columns.substring(0, 1) === "(")
// queryParts.columns = queryParts.columns.substring(1, -1);
queryParts.columns = queryParts.columns.split(',');
}
var i = 0;
_.each(queryParts.columns, function (columnName) {
if (i === 0 && columnName.substring(0,1) === "(")
s.field(columnName.split("(")[1]);
else if (i === queryParts.columns.length-1)
{
var col = columnName;
var n = columnName.split(")").length-1;
if(n === 1 && !_.contains(col,"("))
s.field(columnName.split(")")[0]);
else s.field(col);
}
else s.field(columnName);
i++;
});
}
if (queryParts.concatColumns && queryParts.concatColumns !== "*" ) {
if(typeof queryParts.concatColumns === "string") {
// if (queryParts.columns.substring(0, 1) === "(")
// queryParts.columns = queryParts.columns.substring(1, -1);
queryParts.concatColumns = queryParts.concatColumns.split(';');
}
var i = 0;
_.each(queryParts.concatColumns, function (columnName) {
if (i === 0 && columnName.substring(0,1) === "(")
s.field(columnName.split("(")[1]);
else if (i === queryParts.concatColumns.length-1)
{
var col = columnName;
var n = columnName.split(")").length-1;
if(n === 1 && !_.contains(col,"("))
s.field(columnName.split(")")[0]);
else s.field(col);
}
else s.field(columnName);
i++;
});
}
s.where.apply(this,queryParts['where']);
_.each(queryParts['order'], function(param) {s.order(param.column, param.asc);});
s.limit(queryParts['limit'] || queryLimit);
s.offset(queryParts['offset'] || queryOffset);
_.each(queryParts['group'],function(col) {s.group(col);});
var q = s.toParam();
console.log(q.text.replace("\\",""));
console.log(q.values);
var sql = q.text.replace("\\","");
var values = q.values;
// var queryHandler = params.callback;
getServerConnection(function(err, connection) {
if (err) return queryHandler(err, null);
connection.query(sql, values, function(err, rows, fields) {
if(err) {
result.errorMessage = "Error querying server";
result.error = err;
result.sql=sql;
result.sqlParams=values;
}
else {
result.startIndex = queryParts.offset || queryOffset;
result.size = rows.length;
result.result = rows;
result.sql=sql;
result.sqlParams=values;
}
// queryHandler(err, result);
callback(result);
connection.release();
});
});
};
service.reportMultiQueryServer = function(queryPartsArray) {
var multiquery="";
var multuvalues=[];
var result = {};
var tableAlias='t1';
_.each(queryPartsArray,function(queryParts){
// console.log(queryParts,"current query part")
if(queryParts!==undefined)
{
var result = {};
var tableAlias='t1';
if(queryParts['alias'])tableAlias=queryParts['alias'];
var s = squel.select()
.from(queryParts['table'],tableAlias);
_.each(queryParts['joins'],function(join) {
if (join[3]=='JOIN') s.join(join[0],join[1],join[2]);
if (join[3]=='INNER JOIN') s.join(join[0],join[1],join[2]);
if (join[3]=='OUTER JOIN') s.outer_join(join[0],join[1],join[2]);
if (join[3]=='LEFT OUTER JOIN') s.left_outer_join(join[0],join[1],join[2]);
});
if (queryParts.columns && queryParts.columns !== "*" ) {
if(typeof queryParts.columns === "string") {
// if (queryParts.columns.substring(0, 1) === "(")
// queryParts.columns = queryParts.columns.substring(1, -1);
queryParts.columns = queryParts.columns.split(',');
}
var i = 0;
_.each(queryParts.columns, function (columnName) {
if (i === 0 && columnName.substring(0,1) === "(")
s.field(columnName.split("(")[1]);
else if (i === queryParts.columns.length-1)
{
var col = columnName;
var n = columnName.split(")").length-1;
if(n === 1 && !_.contains(col,"("))
s.field(columnName.split(")")[0]);
else s.field(col);
}
else s.field(columnName);
i++;
});
}
if (queryParts.concatColumns && queryParts.concatColumns !== "*" ) {
if(typeof queryParts.concatColumns === "string") {
// if (queryParts.columns.substring(0, 1) === "(")
// queryParts.columns = queryParts.columns.substring(1, -1);
queryParts.concatColumns = queryParts.concatColumns.split(';');
}
var i = 0;
_.each(queryParts.concatColumns, function (columnName) {
if (i === 0 && columnName.substring(0,1) === "(")
s.field(columnName.split("(")[1]);
else if (i === queryParts.concatColumns.length-1)
{
var col = columnName;
var n = columnName.split(")").length-1;
if(n === 1 && !_.contains(col,"("))
s.field(columnName.split(")")[0]);
else s.field(col);
}
else s.field(columnName);
i++;
});
}
s.where.apply(this,queryParts['where']);
_.each(queryParts['order'], function(param) {s.order(param.column, param.asc);});
s.limit(queryParts['limit'] || queryLimit);
s.offset(queryParts['offset'] || queryOffset);
_.each(queryParts['group'],function(col) {s.group(col);});
var q = s.toParam();
console.log(q.text.replace("\\",""));
console.log(q.values,"Values passed");
var sql = q.text.replace("\\","");
var values = q.values;
// var queryHandler = params.callback;
if( multiquery===""){
multiquery=sql;}else{
multiquery= multiquery+";"+sql;
}
_.each(values,function(res){
multuvalues.push(res);
})
}
});
return [ multiquery,multuvalues];
};
return service;
}();