/* LiteSQL - Common routines for backends *  * By Tero Laitinen  *  * See LICENSE for copyright information. */#include "compatibility.hpp"#include "litesql/backend.hpp"#include "litesql/string.hpp"#include "litesql/types.hpp"namespace litesql {using namespace std;    string Backend::groupInsert(Record tables, Records fields, Records values,                   string sequence) const {    string id = values[0][0];        if (supportsSequences() && values[0][0] == "NULL")        id = execute("SELECT nextval('" + sequence + "');")->records()[0][0];    for (int i = tables.size()-1; i >= 0; i--) {        string fieldString = Split(fields[i]).join(",");        string valueString;        if (!values[i].empty())            values[i][0] = id;        Split valueSplit(values[i]);        for (size_t i2 = 0; i2 < valueSplit.size(); i2++)            valueSplit[i2] = escapeSQL(valueSplit[i2]);        valueString = valueSplit.join(",");        string query = "INSERT INTO " + tables[i] + " (" + fieldString            + ") VALUES (" + valueString + ");";        execute(query);        if (!supportsSequences() && id == "NULL")             id = getInsertID();            }    return id;}}