PostgreSQL prep

Update of vendored SQL libs and refactoring of store provider layer.

core/database/params.go

@@ -0,0 +1,39 @@
+// Copyright 2016 Documize Inc. <legal@documize.com>. All rights reserved.
+//
+// This software (Documize Community Edition) is licensed under
+// GNU AGPL v3 http://www.gnu.org/licenses/agpl-3.0.en.html
+//
+// You can operate outside the AGPL restrictions by purchasing
+// Documize Enterprise Edition and obtaining a commercial license
+// by contacting <sales@documize.com>.
+//
+// https://documize.com
+
+package database
+
+import (
+	"github.com/documize/community/core/env"
+	"github.com/jmoiron/sqlx"
+)
+
+// RebindParams changes MySQL query parameter placeholder from "?" to
+// correct value for given database provider.
+//
+// MySQL uses ?, ?, ? (default for all Documize queries)
+// PostgreSQL uses $1, $2, $3
+// MS SQL Server uses @p1, @p2, @p3
+func RebindParams(sql string, s env.StoreType) string {
+	bindParam := sqlx.QUESTION
+
+	switch s {
+	case env.StoreTypePostgreSQL:
+		bindParam = sqlx.DOLLAR
+	}
+
+	return sqlx.Rebind(bindParam, sql)
+}
+
+// RebindPostgreSQL is a helper method on top of RebindParams.
+func RebindPostgreSQL(sql string) string {
+	return RebindParams(sql, env.StoreTypePostgreSQL)
+}