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sql.js
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sql.js
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'use strict';
/*
* MySQL object-relational mapping
* ===============================
*
* (C) 2014 Mark K Cowan <mark@battlesnake.co.uk>
*
* https://github.com/battlesnake/node-mysql-orm
*
* Released under GNU General Public License, Version 2
*
*/
var mysql = require('mysql');
var async = require('async');
var _ = require('underscore');
var utils = require('./utils');
var names = utils.names;
var shift = utils.shift;
// sql
// ===
// SQL clause generators
//
//
// SELECT <fields>
// ------
//
// `$fields` can contain a mix of field references and field names.
// Defaults to '*' if no fields are specified.
//
module.exports.select = function (self, fields, callback) {
if (fields) {
fields = fields.map(
function (field) {
if (field.$type === 'field') {
return field.$name;
}
else {
return field;
}
}
);
return callback(null, mysql.format('SELECT ??', [fields]));
}
else {
return callback(null, 'SELECT *');
}
};
//
// DELETE
// ------
//
// No point making this async-style, it can never take parameters. QUICK and
// IGNORE are irrelevant as performance is not an objective of this package.
//
// Then again, I like having my clause lists in async.parallel, and as stated,
// performance is not important in this library, so "async style" it is.
//
module.exports.delete = function (callback) {
callback(null, 'DELETE');
}
//
// table name
// ----------
//
// Table can be a string or a table reference.
//
function tableName(table, callback) {
if (_(table).isString()) {
return callback(null, mysql.escapeId(table));
}
else if (table.$type === 'table') {
return callback(null, mysql.escapeId(table.$name));
}
else {
return callback(new Error('Unknown table specification: "' + table +
'"'));
}
}
//
// INSERT INTO <table name>
// -----------
//
// Table can be a table reference or a table name.
//
module.exports.insertInto = function (self, table, callback) {
tableName(table, function (err, res) {
if (err) {
return callback(err);
}
callback(null, 'INSERT INTO ' + res);
});
};
//
// UPDATE <table name>
// ------
//
// Table can be a table reference or a table name.
//
module.exports.update = function (self, table, callback) {
tableName(table, function (err, res) {
if (err) {
return callback(err);
}
callback(null, 'UPDATE ' + res);
});
};
//
// FROM <table name>
// ----
//
// Table can be a table reference or a table name.
//
module.exports.from = function (self, table, callback) {
tableName(table, function (err, res) {
if (err) {
return callback(err);
}
callback(null, 'FROM ' + res);
});
};
//
// WHERE <criteria>
// -----
//
// Properties of criteria are used to generate search constraints. Foreign row
// IDs are looked up where necessary to generate these constraints.
//
module.exports.where = function (self, query, table, criteria, callback) {
var cols = _(criteria).keys();
criteria = _(criteria).clone();
if (table.$primary.length === 1 && _(criteria).has(table.$primary)) {
var primary = table.$primary[0];
criteria = _.object([primary], [criteria[primary]]);
cols = [primary]
}
if (cols.length) {
if (_(table).isString()) {
table = self.schema[table];
}
var refs = self.listForeignKeys(table);
if (refs.length) {
self.lookupForeignIds(query, table, criteria, { cols: cols }, function (err, res) {
if (err) {
return callback(err);
}
generateClause(res);
});
}
else {
generateClause(criteria);
}
}
else {
return callback(null);
}
function generateClause(row) {
cols.forEach(function (fieldName) {
var field = table[fieldName];
if (field.serialize) {
row[fieldName] = field.serialize(row[fieldName]);
}
});
return callback(null,
'WHERE\n\t' + cols
.map(function (col) {
return mysql.format('??=?', [col, row[col]]);
})
.join(' AND\n\t'));
}
};
//
// ORDER BY <field [direction]>
// --------
//
// criteria.$sort property, or (as fallback) table.$sort are used to generate
// sorting instructions. $sort can be a field name/reference or an array of
// such. Begin field names with +/- to specify ascending or descending sort
// order.
//
module.exports.orderby = function (self, table, sort, callback) {
var sort = sort || table.$sort || [];
if (sort.length) {
if (_(sort).isString()) {
sort = [sort];
}
return callback(null, 'ORDER BY\n\t' + sort.map(function (field) {
if (field.$type === 'field') {
field = field.$name;
}
if (!_(field).isString()) {
return callback(new Error('$sort must either be a field ' +
'name a field reference, or an array of field ' +
'names/references'));
}
if (field.charAt(0) === '-') {
return mysql.escapeId(field.substr(1)) + ' DESC';
}
else if (field.charAt(0) === '+') {
return mysql.escapeId(field.substr(1)) + ' ASC';
}
else {
return mysql.escapeId(field);
}
}).join(',\n\t'));
}
else {
return callback(null);
}
};
//
// LIMIT <count> [OFFSET <start>]
// -----
//
// Uses a combination of $first, $last and $count to generate a LIMIT clause.
//
module.exports.limit = function (self, options, callback) {
var lparams =
_(options).has('first')?1:0 +
_(options).has('count')?2:0 +
_(options).has('last') ?4:0;
var first = options.first, last = options.last, count = options.count;
switch (lparams) {
case 0: return callback(null);
case 1: return callback(new Error('first value for LIMIT specified, but no last or count value'));
case 2: return callback(null, mysql.format('LIMIT ?', [count])); break;
case 3: return callback(null, mysql.format('LIMIT ?\nOFFSET ?', [count, first])); break;
case 4: return callback(new Error('last value for LIMIT specified, but no first or count value'));
case 5: return callback(null, mysql.format('LIMIT ?\nOFFSET ?', [last - first, first])); break;
case 6: return callback(null, mysql.format('LIMIT ?\nOFFSET ?', [count, last - count])); break;
case 7: return callback(new Error('first, last, count were all specified for LIMIT'));
}
};
//
// ON DUPLICATE KEY UPDATE <name = VALUES(name), ...>
// -----------------------
//
// Generates a list of copy assignments
//
module.exports.onDuplicateKeyUpdate = function (self, keys, callback) {
callback(null,
'ON DUPLICATE KEY UPDATE\n\t' + keys.map(
function (key) {
return mysql.format('?? = VALUES(??)', [key, key]);
}
).join(',\n\t'));
};
//
// SET <name = value, ...>
// ---
//
// Generates a list of assignments
//
module.exports.set = function (self, keys, row, callback) {
if (!keys) {
keys = names(row);
}
callback(null,
'SET\n\t' + keys.map(
function (key) {
return mysql.format('?? = ?', [key, row[key]]);
}
).join(',\n\t'));
};