Created
August 9, 2012 01:40
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massive-js postgres.js workaround
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var events =require('events'); | |
var util = require('util'); | |
var _ = require('underscore')._; | |
var pg = require("pg"); | |
var Query = require('./query'); | |
var Table = require('./table'); | |
var Postgres = function(connection){ | |
events.EventEmitter.call(this); | |
var self = this; | |
this.dbType = "PostgreSQL"; | |
this.tables = []; | |
this.connectionString = connection; | |
this.sql = ""; | |
this.params = []; | |
this.tableSQL = "SELECT \ | |
table_name as name, \ | |
(select cu.column_name \ | |
from \ | |
information_schema.key_column_usage cu, \ | |
information_schema.table_constraints tc \ | |
where \ | |
cu.constraint_name = tc.constraint_name \ | |
and tc.constraint_type = 'PRIMARY KEY' \ | |
and tc.table_name = ist.table_name \ | |
) as pk \ | |
from information_schema.tables ist \ | |
where table_schema NOT IN ('pg_catalog', 'information_schema')"; | |
this.end = function() { pg.end(); }; | |
this.insertKludge = function() { return " \nRETURNING *"; } | |
this.placeholder = function(seed) { return '$' + seed; } | |
this.execute = function(sql, params, callback) { | |
pg.connect(self.connectionString, function(err,db){ | |
self.emit("beforeExecute", self); | |
db.query(sql, params,function(err, results){ | |
if(err && callback) { | |
callback(err,null,db) | |
self.emit("error", err); | |
}else { | |
if(results && results.rows.length > 0){ | |
if(callback)callback(null,results.rows,db); | |
}else { | |
if(callback)callback(null,results,db); | |
} | |
self.emit("executed"); | |
} | |
}); | |
}); | |
}; | |
this.run = function(sql,params) { | |
return new Query(sql,params, this); | |
}; | |
this.loadTables = function(callback) { | |
self.execute(self.tableSQL, [], function(err, tables){ | |
_.each(tables, function(table){ | |
var t = new Table(table.name, table.pk, self); | |
self.tables.push(t); | |
self[t.name] = t; | |
}); | |
callback(null,self); | |
}); | |
}; | |
var _translateType = function(typeName) { | |
var _result = typeName; | |
switch(typeName){ | |
case "pk" : | |
_result ="serial PRIMARY KEY"; | |
break; | |
case "money" : | |
_result ="decimal(8,2)"; | |
break; | |
case "date" : | |
_result = "timestamptz"; | |
break; | |
case "string" : | |
_result ="varchar(255)"; | |
break; | |
case "search" : | |
_result ="tsvector"; | |
break; | |
case "int" : | |
_result ="int4"; | |
break; | |
} | |
return _result; | |
} | |
var _containsPK = function(columns) { | |
return _.any(columns.values,"pk"); | |
} | |
this.dropTable = function(tableName) { | |
return new Query("DROP TABLE IF EXISTS " + tableName + ";", [], new Table(tableName, "", self)); | |
} | |
this.createTable = function(tableName, columns) { | |
var _sql ="CREATE TABLE " + tableName + "("; | |
var _cols = []; | |
//force a PK | |
if(!_containsPK(columns)){ | |
columns.id = "pk"; | |
} | |
for(var c in columns){ | |
if(c == "timestamps"){ | |
_cols.push("created_at timestamptz not null default 'now'"); | |
_cols.push("updated_at timestamptz not null default 'now'"); | |
}else{ | |
var colName = c; | |
var colParts = columns[c].split(" "); | |
var colType = colParts[0]; | |
var translated = _translateType(colType); | |
var extras = _.without(colParts,colType).join(" "); | |
var declaration = colName + " " + translated + " " + extras; | |
//console.log(declaration); | |
_cols.push(declaration); | |
} | |
} | |
_sql+= _cols.join(",") + ");"; | |
//console.log(_sql); | |
return new Query(_sql, [], new Table(tableName, columns.id, self)); | |
}; | |
}; | |
util.inherits(Postgres,events.EventEmitter); | |
module.exports = Postgres; |
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