orange-orm/src/table/relatedTable/joinSql.js

Object Relational Mapper

var newShallowJoinSql = require('../query/singleQuery/joinSql/newShallowJoinSql');
var newParameterized = require('../query/newParameterized');

function newJoinSql(context, relations, depth = 0) {
	var leftAlias,
		rightAlias;
	var relation;
	var c = {};
	var sql = newParameterized('');

	c.visitJoin = function(relation) {
		//todo fix discriminators on childTable
		sql = newShallowJoinSql(context, relation.parentTable, relation.childTable._primaryColumns, relation.columns, leftAlias, rightAlias).prepend(' INNER').prepend(sql);
	};

	c.visitOne = function(relation) {
		innerJoin(relation);
	};

	c.visitMany = c.visitOne;

	function innerJoin(relation) {
		var joinRelation = relation.joinRelation;
		var table = joinRelation.childTable;
		var rightColumns = table._primaryColumns;
		var leftColumns = joinRelation.columns;

		sql = newShallowJoinSql(context, table, leftColumns, rightColumns, leftAlias, rightAlias).prepend(' INNER').prepend(sql);
	}

	for (let i = relations.length - 1; i > depth; i--) {
		leftAlias = 'x' + (i + 1);
		rightAlias = 'x' + i;
		relation = relations[i];
		relation.accept(c);
	}
	return sql;
}

module.exports = newJoinSql;