node-query/node_modules/mysql2/lib/sql_string.js

146 lines
3.5 KiB
JavaScript

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