Improve pragma handling for sqlite3

lib/dialects/sqlite/connector-manager.js

@@ -5,22 +5,17 @@ var Utils   = require("../../utils")
 module.exports = (function() {
 module.exports = (function() {
   var ConnectorManager = function(sequelize) {
   var ConnectorManager = function(sequelize) {
     this.sequelize = sequelize
     this.sequelize = sequelize
-    this.database  = new sqlite3.Database(sequelize.options.storage || ':memory:')
-    this.opened    = false
+    this.database  = db = new sqlite3.Database(sequelize.options.storage || ':memory:', function(err) {
+      if(!err && sequelize.options.foreignKeys !== false) {
+        // Make it possible to define and use foreign key constraints unelss
+        // explicitly disallowed. It's still opt-in per relation
+        db.run('PRAGMA FOREIGN_KEYS=ON')
       }
       }
-  Utils._.extend(ConnectorManager.prototype, require("../connector-manager").prototype)
-
-  ConnectorManager.prototype.query = function(sql, callee, options) {
-    var self = this
-    // Turn on foreign key checking (if the database has any) unless explicitly
-    // disallowed globally.
-    if(!this.opened && this.sequelize.options.foreignKeys !== false) {
-      this.database.serialize(function() {
-        self.database.run("PRAGMA FOREIGN_KEYS = ON")
-        self.opened = true
     })
     })
   }
   }
+  Utils._.extend(ConnectorManager.prototype, require("../connector-manager").prototype)
 
 
+  ConnectorManager.prototype.query = function(sql, callee, options) {
     return new Query(this.database, this.sequelize, callee, options).run(sql)
     return new Query(this.database, this.sequelize, callee, options).run(sql)
   }
   }