146 lines
3.5 KiB
JavaScript
146 lines
3.5 KiB
JavaScript
var SqlString = exports;
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SqlString.escapeId = function (val, forbidQualified) {
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if (forbidQualified) {
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return '`' + val.replace(/`/g, '``') + '`';
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}
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return '`' + val.replace(/`/g, '``').replace(/\./g, '`.`') + '`';
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};
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SqlString.escape = function(val, stringifyObjects, timeZone) {
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if (val === undefined || val === null) {
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return 'NULL';
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}
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switch (typeof val) {
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case 'boolean': return (val) ? 'true' : 'false';
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case 'number': return val+'';
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}
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if (val instanceof Date) {
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val = SqlString.dateToString(val, timeZone || "Z");
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}
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if (Buffer.isBuffer(val)) {
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return SqlString.bufferToString(val);
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}
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if (Array.isArray(val)) {
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return SqlString.arrayToList(val, timeZone);
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}
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if (typeof val === 'object') {
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if (stringifyObjects) {
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val = val.toString();
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} else {
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return SqlString.objectToValues(val, timeZone);
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}
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}
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val = val.replace(/[\0\n\r\b\t\\\'\"\x1a]/g, function(s) {
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switch(s) {
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case "\0": return "\\0";
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case "\n": return "\\n";
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case "\r": return "\\r";
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case "\b": return "\\b";
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case "\t": return "\\t";
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case "\x1a": return "\\Z";
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default: return "\\"+s;
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}
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});
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return "'"+val+"'";
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};
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SqlString.arrayToList = function(array, timeZone) {
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return array.map(function(v) {
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if (Array.isArray(v)) return '(' + SqlString.arrayToList(v) + ')';
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return SqlString.escape(v, true, timeZone);
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}).join(', ');
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};
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SqlString.format = function(sql, values, timeZone) {
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values = [].concat(values);
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return sql.replace(/\?\??/g, function(match) {
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if (!values.length) {
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return match;
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}
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if (match == "??") {
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return SqlString.escapeId(values.shift());
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}
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return SqlString.escape(values.shift(), false, timeZone);
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});
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};
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SqlString.dateToString = function(date, timeZone) {
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var dt = new Date(date);
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if (timeZone != 'local') {
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var tz = convertTimezone(timeZone);
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dt.setTime(dt.getTime() + (dt.getTimezoneOffset() * 60000));
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if (tz !== false) {
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dt.setTime(dt.getTime() + (tz * 60000));
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}
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}
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var year = dt.getFullYear();
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var month = zeroPad(dt.getMonth() + 1, 2);
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var day = zeroPad(dt.getDate(), 2);
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var hour = zeroPad(dt.getHours(), 2);
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var minute = zeroPad(dt.getMinutes(), 2);
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var second = zeroPad(dt.getSeconds(), 2);
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var millisecond = zeroPad(dt.getMilliseconds(), 3);
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return year + '-' + month + '-' + day + ' ' + hour + ':' + minute + ':' + second + '.' + millisecond;
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};
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SqlString.bufferToString = function(buffer) {
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var hex = '';
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try {
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hex = buffer.toString('hex');
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} catch (err) {
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// node v0.4.x does not support hex / throws unknown encoding error
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for (var i = 0; i < buffer.length; i++) {
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var byte = buffer[i];
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hex += zeroPad(byte.toString(16));
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}
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}
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return "X'" + hex+ "'";
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};
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SqlString.objectToValues = function(object, timeZone) {
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var values = [];
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for (var key in object) {
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var value = object[key];
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if(typeof value === 'function') {
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continue;
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}
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values.push(this.escapeId(key) + ' = ' + SqlString.escape(value, true, timeZone));
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}
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return values.join(', ');
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};
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function zeroPad(number, length) {
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number = number.toString();
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while (number.length < length) {
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number = '0' + number;
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}
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return number;
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}
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function convertTimezone(tz) {
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if (tz == "Z") return 0;
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var m = tz.match(/([\+\-\s])(\d\d):?(\d\d)?/);
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if (m) {
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return (m[1] == '-' ? -1 : 1) * (parseInt(m[2], 10) + ((m[3] ? parseInt(m[3], 10) : 0) / 60)) * 60;
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}
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return false;
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}
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