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sql.js
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192 lines (162 loc) · 4.07 KB
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require('../index');
function SQL(query) {
var self = this;
self.options = {};
self.builder = new framework_nosql.DatabaseBuilder(null);
self.query = query;
var type = self.parseType();
switch (type) {
case 'select':
self.parseLimit();
self.parseOrder();
self.parseWhere();
self.parseJoins();
self.parseTable();
self.parseNames();
break;
case 'update':
self.parseWhere();
self.parseTable();
self.parseUpdate();
break;
case 'insert':
self.parseWhere();
self.parseInsert();
break;
case 'delete':
self.parseWhere();
self.parseTable();
break;
}
console.log(self.options);
}
var SQLP = SQL.prototype;
SQLP.parseLimit = function() {
var self = this;
var tmp = self.query.match(/take \d+ skip \d+$/i);
!tmp && (tmp = self.query.match(/skip \d+ take \d+$/i));
!tmp && (tmp = self.query.match(/take \d+$/i));
!tmp && (tmp = self.query.match(/skip \d+$/i));
if (!tmp)
return self;
self.query = self.query.replace(tmp, '').trim();
var arr = tmp[0].toString().toLowerCase().split(' ');
if (arr[0] === 'take')
self.options.take = +arr[1];
else if (arr[2] === 'take')
self.options.take = +arr[3];
if (arr[0] === 'skip')
self.options.skip = +arr[1];
else if (arr[2] === 'skip')
self.options.skip = +arr[3];
return self;
};
SQLP.parseOrder = function() {
var self = this;
var tmp = self.query.match(/order by .*?$/i);
if (!tmp)
return self;
self.query = self.query.replace(tmp, '').trim();
var arr = tmp[0].toString().substring(9).split(',');
self.options.sort = [];
for (var i = 0; i < arr.length; i++) {
tmp = arr[i].trim().split(' ');
self.options.sort.push({ name: tmp[0], desc: (tmp[1] || '').toLowerCase() === 'desc' });
}
return self;
};
SQLP.parseWhere = function() {
var self = this;
var tmp = self.query.match(/where .*?$/i);
if (!tmp)
return self;
self.query = self.query.replace(tmp, '');
tmp = tmp[0].toString().substring(6).replace(/\sAND\s/gi, ' && ').replace(/\sOR\s/gi, ' || ').replace(/[a-z0-9]=/gi, function(text) {
return text + '=';
});
self.options.where = tmp;
return self;
};
SQLP.parseJoins = function() {
var self = this;
var tmp = self.query.match(/left join.*?$/i);
if (!tmp) {
tmp = self.query.match(/join.*?$/i);
if (!tmp)
return self;
}
self.query = self.query.replace(tmp, '');
tmp = tmp[0].toString().trim();
// console.log(tmp);
return self;
};
SQLP.parseTable = function() {
var self = this;
var tmp = self.query.match(/from\s.*?$/i);
if (!tmp)
return self;
self.query = self.query.replace(tmp, '');
tmp = tmp[0].toString().substring(5).trim();
var arr = tmp.split(' ');
// console.log(arr);
return self;
};
SQLP.parseNames = function() {
var self = this;
var tmp = self.query.match(/select\s.*?$/i);
if (!tmp)
return self;
self.query = self.query.replace(tmp, '');
tmp = tmp[0].toString().substring(6).trim().split(',');
self.options.fields = [];
for (var i = 0; i < tmp.length; i++) {
var field = tmp[i].trim();
var alias = field.match(/as\s.*?$/);
var name = '';
var type = 0;
if (alias) {
field = field.replace(alias, '');
alias = alias.toString().substring(3);
}
var index = field.indexOf('(');
if (index !== -1) {
switch (field.substring(0, index).toLowerCase()) {
case 'count':
type = 1;
break;
case 'min':
type = 2;
break;
case 'max':
type = 3;
break;
case 'avg':
type = 4;
break;
case 'sum':
type = 5;
break;
case 'distinct':
type = 6;
break;
}
name = field.substring(index + 1, field.lastIndexOf(')'));
} else
name = field;
self.options.fields.push({ alias: alias || name, name: name, type: type });
}
return self;
};
SQLP.parseUpdate = function() {
var self = this;
return self;
};
SQLP.parseInsert = function() {
var self = this;
return self;
};
SQLP.parseType = function() {
var self = this;
return self.query.substring(0, self.query.indexOf(' ')).toLowerCase();
};
var sql = new SQL('SELECT COUNT(*) as count, id FROM table a JOIN users ON id=id WHERE a.name="Peter" AND a.age=30 ORDER BY a.name, a.age ASC TAKE 20 SKIP 10');