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| var querystring = require('querystring');
/**
* 数据库基类
* @return {[type]} [description]
*/
var Db = module.exports = Class(function(){
'use strict';
//用于查询的sql语句，所有select语句根据该语句解析
var selectSql = 'SELECT%DISTINCT% %FIELD% FROM %TABLE%%JOIN%%WHERE%%GROUP%%HAVING%%ORDER%%LIMIT% %UNION%%COMMENT%';
//where条件里的表达式
var comparison = {
'EQ': '=',
'NEQ': '!=',
'<>': '!=',
'GT': '>',
'EGT': '>=',
'LT': '<',
'ELT': '<=',
'NOTLIKE': 'NOT LIKE',
'LIKE': 'LIKE',
'IN': 'IN',
'NOTIN': 'NOT IN'
};
//数据查询缓存
var dbCacheData = {};
//数据库连接
var dbConnections = {};
//获取数据配置的基本信息
var getDbItem = function(value, index){
value = value || "";
Eif (isString(value)) {
value = value.split(',');
}
return index !== undefined ? (value[index] || value[0]) : value;
}
return {
// 数据库类型
dbType: null,
// 当前操作所属的模型名
model: 'think',
// 当前SQL指令
sql: '',
// 操作的sql列表
modelSql: {},
// 数据库连接参数配置
config: '',
// 事务次数
transTimes: 0,
//最后插入的id
lastInsertId: 0,
//查询等待
queryWaiting: {},
/**
* 初始化
* @return {[type]} [description]
*/
init: function(config){
this.config = config;
},
/**
* 初始化数据库连接
* @param {[type]} master [description]
* @return {[type]} [description]
*/
initConnect: function(master){
var hosts = getDbItem(this.config.host);
//单个host
Eif (hosts.length === 1) {
return this.getConnection(0, this.connect, [this.config]);
}
return this.multiConnect(master);
},
/**
* 分布式连接
* @return {[type]} [description]
*/
multiConnect: function(master){
var config = this.config;
var index = 0;
var hostnameLength = getDbItem(config.host).length;
//读写分离
if (config.rw_separate) {
if (master) {
index = rand(0, config.master_num - 1);
}else{
if (isNumber(config.slave_no)) {
index = config.slave_no;
}else{
index = rand(config.master_num, hostnameLength - 1);
}
}
}else{
index = rand(0, hostnameLength - 1);
}
var dbConfig = {
user: getDbItem(config.user, index),
password: getDbItem(config.password, index),
host: getDbItem(config.host, index),
port: getDbItem(config.port, index),
database: getDbItem(config.database, index),
charset: getDbItem(config.charset, index),
}
dbConfig = extend({}, config, dbConfig);
return this.getConnection(index, this.connect, [dbConfig]);
},
/**
* 获取数据连接句柄
* @param {[type]} index [description]
* @param {Function} callback [description]
* @param {[type]} data [description]
* @return {[type]} [description]
*/
getConnection: function(index, callback, data){
var key = md5(JSON.stringify(this.config));
if (!(key in dbConnections)) {
dbConnections[key] = [];
}
if (dbConnections[key][index]) {
return dbConnections[key][index];
}
var connection = callback.apply(this, data);
dbConnections[key][index] = connection;
return connection;
},
/**
* 解析set集合
* @param {[type]} data [description]
* @return {[type]} [description]
*/
parseSet: function(data){
data = data || {};
var set = [];
for(var key in data){
var value = this.parseValue(data[key]);
Eif (isScalar(value)) {
set.push(this.parseKey(key) + '=' + value);
}
}
return ' SET ' + set.join(',');
},
/**
* 解析字段名，具体的数据库里实现
* @param {[type]} key [description]
* @return {[type]} [description]
*/
parseKey: function(key){
return key;
},
/**
* value分析
* @param {[type]} value [description]
* @return {[type]} [description]
*/
parseValue: function(value){
if (isString(value)) {
value = '\'' + this.escapeString(value) + '\'';
}else if(isArray(value)){
if ((value[0] + '').toLowerCase() === 'exp') {
value = value[1];
}else{
var self = this;
value = value.map(function(item){
return self.parseValue(item);
});
}
}else Iif(isBoolean(value)){
value = value ? '1' : '0';
}else Iif (value === null) {
value = 'null';
}
return value;
},
/**
* field分析
* parseField('name');
* parseField('name,email');
* parseField({
* xx_name: 'name',
* xx_email: 'email'
* })
* @return {[type]} [description]
*/
parseField: function(fields){
if (isString(fields) && fields.indexOf(',') > -1) {
fields = fields.split(',');
}
if (isArray(fields)) {
var self = this;
return fields.map(function(item){
return self.parseKey(item);
}).join(',');
}else Iif(isObject(fields)){
var data = [];
for(var key in fields){
data.push(this.parseKey(key) + ' AS ' + this.parseKey(fields[key]));
}
return data.join(',');
}else if(isString(fields) && fields){
return this.parseKey(fields);
}
return '*';
},
/**
* table别名分析
* @param {[type]} tables [description]
* @return {[type]} [description]
*/
parseTable: function(tables){
Eif (isString(tables)) {
tables = tables.split(',');
}
Eif (isArray(tables)) {
var self = this;
return tables.map(function(item){
return self.parseKey(item);
}).join(',');
}else if (isObject(tables)) {
var data = [];
for(var key in tables){
data.push(this.parseKey(key) + ' AS ' + this.parseKey(tables[key]));
}
return data.join(',');
}
return '';
},
/**
* where条件分析
* @param {[type]} where [description]
* @return {[type]} [description]
*/
parseWhere: function(where){
var whereStr = '';
var self = this;
where = where || {};
if (isString(where)) {
whereStr = where;
}else{
// 定义逻辑运算规则 例如 OR XOR AND NOT
var oList = ['AND', 'OR', 'XOR'];
var operate = (where._logic + '').toUpperCase();
delete where._logic;
operate = oList.indexOf(operate) > -1 ? ' ' + operate + ' ' : ' AND ';
//key值的安全检测正则
var keySafeRegExp = /^[\w\|\&\-\.\(\)\,]+$/;
var multi = where._multi;
delete where._multi;
var val;
var fn = function(item, i){
var v = multi ? val[i] : val;
return '(' + self.parseWhereItem(self.parseKey(item), v) + ')';
};
for(var key in where){
key = key.trim();
val = where[key];
whereStr += '( ';
if (key.indexOf('_') === 0) {
// 解析特殊条件表达式
whereStr += this.parseThinkWhere(key, val);
}else{
Iif (!keySafeRegExp.test(key)) {
console.log(key + ' is not safe');
continue;
}
var arr;
// 支持 name|title|nickname 方式定义查询字段
if (key.indexOf('|') > -1) {
arr = key.split('|');
whereStr += arr.map(fn).join(' OR ');
}else if (key.indexOf('&') > -1) {
arr = key.split('&');
whereStr += arr.map(fn).join(' AND ');
}else{
whereStr += this.parseWhereItem(this.parseKey(key), val);
}
}
whereStr += ' )' + operate;
}
whereStr = whereStr.substr(0, whereStr.length - operate.length);
}
return whereStr ? (' WHERE ' + whereStr) : '';
},
/**
* 解析单个查询条件
* @param {[type]} key [description]
* @param {[type]} val [description]
* @return {[type]} [description]
*/
parseWhereItem: function(key, val){
if (isObject(val)) { // {id: {'<': 10, '>': 1}}
var logic = (val._logic || 'AND').toUpperCase();
delete val._logic;
var result = [];
for(var opr in val){
var nop = opr.toUpperCase();
nop = comparison[nop] || nop;
result.push(key + ' ' + nop + ' ' + this.parseValue(val[opr]));
}
return result.join(' ' + logic + ' ');
}else if (!isArray(val)) {
//对字符串类型字段采用模糊匹配
Iif (C('db_like_fields').indexOf(key) > -1) {
return key + ' LIKE ' + this.parseValue('%' + val + '%');
}else{
return key + ' = ' + this.parseValue(val);
}
}
var whereStr = '';
var data;
if (isString(val[0])) {
var val0 = val[0].toUpperCase();
val0 = comparison[val0] || val0;
if (/^(=|!=|>|>=|<|<=)$/.test(val0)) { // 比较运算
whereStr += key + ' ' + val0 + ' ' + this.parseValue(val[1]);
}else if (/^(NOT\s+LIKE|LIKE)$/.test(val0)) { // 模糊查找
if (isArray(val[1])) { //多个like
var likeLogic = (val[2] || 'OR').toUpperCase();
var likesLogic = ['AND','OR','XOR'];
var self = this;
Eif (likesLogic.indexOf(likeLogic) > -1) {
var like = val[1].map(function(item){
return key + ' ' + val0 + ' ' + self.parseValue(item);
}).join(' ' + likeLogic + ' ');
whereStr += '(' + like + ')';
}
}else{
whereStr += key + ' ' + val0 + ' ' + this.parseValue(val[1]);
}
}else if(val0 === 'EXP'){ // 使用表达式
whereStr += '(' + key + ' ' + val[1] + ')';
}else if(val0 === 'IN' || val0 === 'NOT IN'){ // IN 运算
if (val[2] === 'exp') {
whereStr += key + ' ' + val0 + ' ' + val[1];
}else{
if (isString(val[1])) {
val[1] = val[1].split(',');
}
//如果不是数组，自动转为数组
if (!isArray(val[1])) {
val[1] = [val[1]];
}
val[1] = this.parseValue(val[1]);
//如果只有一个值，那么变成＝或者!=
if (val[1].length === 1) {
whereStr += key + (val0 === 'IN' ? ' = ' : ' != ') + val[1];
}else{
whereStr += key + ' ' + val0 + ' (' + val[1].join(',') + ')';
}
}
}else Eif(val0 === 'BETWEEN'){ // BETWEEN运算
data = isString(val[1]) ? val[1].split(',') : val[1];
if (!isArray(data)) {
data = [val[1], val[2]];
}
whereStr += ' (' + key + ' ' + val0 + ' ' + this.parseValue(data[0]);
whereStr += ' AND ' + this.parseValue(data[1]) + ')';
}else{
console.log('_EXPRESS_ERROR_', key, val);
return '';
}
}else{
var length = val.length;
var rule = 'AND';
Iif (isString(val[length - 1])) {
var last = val[length - 1].toUpperCase();
if (last && ['AND', 'OR', 'XOR'].indexOf(last) > -1) {
rule = last;
length--;
}
}
for(var i = 0; i < length; i++){
var isArr = isArray(val[i]);
data = isArr ? val[i][1] : val[i];
var exp = ((isArr ? val[i][0] : '') + '').toUpperCase();
if (exp === 'EXP') {
whereStr += '(' + key + ' ' + data + ') ' + rule + ' ';
}else{
var op = isArr ? (comparison[val[i][0].toUpperCase()] || val[i][0]) : '=';
whereStr += '(' + key + ' ' + op + ' ' + this.parseValue(data) + ') ' + rule + ' ';
}
}
whereStr = whereStr.substr(0, whereStr.length - 4);
}
return whereStr;
},
/**
* 解析一些特殊的where条件
* @param {[type]} key [description]
* @param {[type]} val [description]
* @return {[type]} [description]
*/
parseThinkWhere: function(key, val){
switch(key){
// 字符串模式查询条件
case '_string':
return val;
// 复合查询条件
case '_complex':
return this.parseWhere(val).substr(6);
// 字符串模式查询条件
case '_query':
var where = isString(val) ? querystring.parse(val) : val;
var op = ' AND ';
if ('_logic' in where) {
op = ' ' + where._logic.toUpperCase() + ' ';
delete where._logic;
}
var arr = [];
for(var name in where){
val = where[name];
val = this.parseKey(name) + ' = ' + this.parseValue(val);
arr.push(val);
}
return arr.join(op);
default:
return '';
}
return '';
},
/**
* 解析limit，对非法的limit进行过滤
* @param {[type]} limit [description]
* @return {[type]} [description]
*/
parseLimit: function(limit){
if (!limit) {
return '';
}
limit = (limit + '').split(',');
var data = [];
for(var i = 0; i < Math.min(2, limit.length); i++){
data[i] = limit[i] | 0;
}
return ' LIMIT ' + data.join(',');
},
/**
* 解析join
* @param {[type]} join [description]
* @return {[type]} [description]
*/
parseJoin: function(join, options){
if (!join) {
return '';
}
var joinStr = '';
var defaultJoin = ' LEFT JOIN ';
Eif (isArray(join)) {
var joins = {
'left': ' LEFT JOIN ',
'right': ' RIGHT JOIN ',
'inner': ' INNER JOIN '
};
join.forEach(function(val){
if (isString(val)) {//字符串，直接拼接
var hasJoin = val.toLowerCase().indexOf(' join ') > -1;
joinStr += (hasJoin ? ' ' : defaultJoin) + val;
}else Eif (isObject(val)) {
var ret = [];
if (!('on' in val)) {
for(var key in val){
var v = val[key];
v.table = key;
ret.push(v);
}
}else{
ret.push(val);
}
ret.forEach(function(item){
var joinType = joins[item.join] || item.join || defaultJoin;
var table = options.tablePrefix + item.table;
joinStr += joinType + '`' + table + '`';
if (item.as) {
joinStr += ' AS ' + item.as;
}
//ON条件
Eif (item.on) {
var mTable = options.alias || options.table;
var jTable = item.as || table;
//多个＝条件
if (isObject(item.on)) {
var where = [];
for(var key in item.on){
where.push(mTable + '.`' + key + '`' + '=' + jTable + '.`' + item.on[key] + '`');
}
joinStr += ' ON (' + where.join(' AND ') + ')';
}else{
if (isString(item.on)) {
item.on = item.on.split(/\s*,\s*/);
}
joinStr += ' ON ' + mTable + '.`' + item.on[0] + '`';
joinStr += '=' + jTable + '.`' + item.on[1] + '`';
}
}
})
}
});
}else{
joinStr += defaultJoin + join;
}
return joinStr;
},
/**
* 解析order
* @param {[type]} order [description]
* @return {[type]} [description]
*/
parseOrder: function(order){
var self = this;
if (isArray(order)) {
order = order.map(function(item){
return self.parseKey(item);
}).join(',');
}else if (isObject(order)) {
var arr = [];
for(var key in order){
var val = order[key];
val = this.parseKey(key) + ' ' + val;
arr.push(val);
}
order = arr.join(',');
}
return order ? (' ORDER BY ' + order) : '';
},
/**
* 解析group
* @param {[type]} group [description]
* @return {[type]} [description]
*/
parseGroup: function(group){
if (!group) {
return '';
}
Eif (isString(group)) {
group = group.split(',');
}
var result = [];
group.forEach(function(item){
item = item.trim();
Iif (!item) {
return;
}
if (item.indexOf('.') === -1) {
result.push('`' + item + '`');
}else{
item = item.split('.');
result.push(item[0] + '.`' + item[1] + '`');
}
})
Iif (!result.length) {
return '';
}
return ' GROUP BY ' + result.join(',');
},
/**
* 解析having
* @param {[type]} having [description]
* @return {[type]} [description]
*/
parseHaving: function(having){
return having ? (' HAVING ' + having) : '';
},
/**
* 解析注释，一般情况下用不到
* @param {[type]} comment [description]
* @return {[type]} [description]
*/
parseComment: function(comment){
return comment ? (' /* ' + comment + '*/') : '';
},
/**
* 解析Distinct
* @param {[type]} distinct [description]
* @return {[type]} [description]
*/
parseDistinct: function(distinct){
return distinct ? ' Distinct ' : '';
},
/**
* 解析Union
* @param {[type]} union [description]
* @return {[type]} [description]
*/
parseUnion: function(union){
if (!union) {
return '';
}
Eif (isArray(union)) {
var self = this;
var sql = '';
union.forEach(function(item){
sql += item.all ? 'UNION ALL ' : 'UNION ';
sql += '(' + (isObject(item.union) ? self.buildSelectSql(item.union).trim() : item.union) + ') ';
})
return sql;
}else{
return 'UNION (' + (isObject(union) ? this.buildSelectSql(union).trim() : union) + ') ';
}
},
/**
* 解析Lock
* @param {[type]} lock [description]
* @return {[type]} [description]
*/
parseLock: function(lock){
if (!lock) {
return '';
}
return ' FOR UPDATE ';
},
/**
* 将page转化为sql里的limit
* @return {[type]} [description]
*/
pageToLimit: function(options){
options = options || {};
//根据page生成limit
if ('page' in options) {
var page = options.page + '';
var listRows = 0;
if (page.indexOf(',') > -1) {
page = page.split(',');
listRows = page[1] | 0;
page = page[0];
}
page = parseInt(page, 10) || 1;
if (!listRows) {
listRows = isNumberString(options.limit) ? options.limit : C('db_nums_per_page');
}
var offset = listRows * (page - 1);
options.limit = offset + ',' + listRows;
}
return options;
},
/**
* 拼接select查询语句
* @param {[type]} options [description]
* @return {[type]} [description]
*/
buildSelectSql: function(options){
options = this.pageToLimit(options);
var sql = this.parseSql(selectSql, options);
sql += this.parseLock(options.lock);
return sql;
},
/**
* 解析sql语句
* @param {[type]} sql [description]
* @param {[type]} options [description]
* @return {[type]} [description]
*/
parseSql: function(sql, options){
options = options || {};
var self = this;
return sql.replace(/\%([A-Z]+)\%/g, function(a, type){
type = type.toLowerCase();
return self['parse' + ucfirst(type)](options[type] || '', options);
}).replace(/__([A-Z_-]+)__/g, function(a, b){
return '`' + C('db_prefix') + b.toLowerCase() + '`';
});
},
/**
* 插入一条记录
* @param {[type]} data [description]
* @param {[type]} options [description]
* @param {[type]} replace [description]
* @return {[type]} [description]
*/
insert: function(data, options, replace){
data = data || {};
options = options || {};
var values = [];
var fields = [];
this.model = options.model;
for(var key in data){
var val = data[key];
val = this.parseValue(val);
Eif (isScalar(val)) {
values.push(val);
fields.push(this.parseKey(key));
}
}
var sql = (replace ? 'REPLACE' : 'INSERT') + ' INTO ';
sql += this.parseTable(options.table) + ' (' + fields.join(',') + ') ';
sql += 'VALUES(' + values.join(',') + ')';
sql += this.parseLock(options.lock) + this.parseComment(options.comment);
return this.execute(sql);
},
/**
* 插入多条记录
* @param {[type]} data [description]
* @param {[type]} options [description]
* @param {[type]} replace [description]
* @return {[type]} [description]
*/
insertAll: function(data, options, replace){
var fields = Object.keys(data[0]);
var self = this;
fields = fields.map(function(item){
return self.parseKey(item);
}).join(',');
var values = data.map(function(item){
var value = [];
for(var key in item){
var val = item[key];
val = self.parseValue(val);
Eif (isScalar(val)) {
value.push(val);
}
}
return '(' + value.join(',') + ')';
}).join(',');
var sql = replace ? 'REPLACE' : 'INSERT';
sql += ' INTO ' + this.parseTable(options.table) + '(' + fields + ') VALUES ' + values;
return this.execute(sql);
},
/**
* 从一个选择条件的结果插入记录
* @param {[type]} fields [description]
* @param {[type]} table [description]
* @param {[type]} options [description]
* @return {[type]} [description]
*/
selectAdd: function(fields, table, options){
options = options || {};
this.model = options.model;
Iif (isString(fields)) {
fields = fields.split(',');
}
var self = this;
fields = fields.map(function(item){
return self.parseKey(item);
});
var sql = 'INSERT INTO ' + this.parseTable(table) + ' (' + fields.join(',') + ') ';
sql += this.buildSelectSql(options);
return this.execute(sql);
},
/**
* 删除记录
* @param {[type]} options [description]
* @return {[type]} [description]
*/
delete: function(options){
options = options || {};
this.model = options.model;
var sql = [
'DELETE FROM ',
this.parseTable(options.table),
this.parseWhere(options.where),
this.parseOrder(options.order),
this.parseLimit(options.limit),
this.parseLock(options.lock),
this.parseComment(options.comment)
].join('');
return this.execute(sql);
},
/**
* 更新数据
* @param {[type]} data [description]
* @param {[type]} options [description]
* @return {[type]} [description]
*/
update: function(data, options){
options = options || {};
this.model = options.model;
var sql = [
'UPDATE ',
this.parseTable(options.table),
this.parseSet(data),
this.parseWhere(options.where),
this.parseOrder(options.order),
this.parseLimit(options.limit),
this.parseLock(options.lock),
this.parseComment(options.comment)
].join('');
return this.execute(sql);
},
/**
* 数据查询
* @todo 返回是个promise，缓存调用需要修改
* @param {[type]} options [description]
* @return {[type]} [description]
*/
select: function(options){
var sql, cache;
if (isString(options) && options.indexOf('SELECT') > -1) {
sql = options;
cache = arguments[1];
}else{
options = options || {};
this.model = options.model;
sql = this.buildSelectSql(options);
cache = options.cache;
}
var self = this;
Iif (!isEmpty(cache) && C('db_cache_on')) {
//内存缓存
if (cache.type === '') {
cache.cacheData = dbCacheData;
}
var key = cache.key || md5(sql);
return S(key, function(){
return self.query(sql);
}, cache);
}
return this.query(sql);
},
/**
* 转义字符
* @param {[type]} str [description]
* @return {[type]} [description]
*/
escapeString: function(str){
Iif (!str) {
return '';
}
return str.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;
}
});
},
/**
* 获取上次的sql语句
* @param {[type]} model [description]
* @return {[type]} [description]
*/
getLastSql: function(model){
return model ? this.modelSql[model] : this.sql;
},
/**
* 设置当前操作的sql
* @param {[type]} sql [description]
*/
setSql: function(sql){
this.sql = sql;
this.modelSql[this.model] = sql;
},
/**
* 设置模型
* @param {[type]} model [description]
*/
setModel: function(model){
this.model = model;
return this;
}
};
});
/**
* 解析配置
* @param {[type]} config [description]
* @return {[type]} [description]
*/
Db.parseConfig = function(config){
'use strict';
config = config || {};
var conf = {
type: config.db_type || C('db_type'),
user: config.db_user || C('db_user'),
password: config.db_pwd || C('db_pwd'),
host: config.db_host || C('db_host'),
port: config.db_port || C('db_port'),
database: config.db_name || C('db_name'),
charset: config.db_charset || C('db_charset'),
rw_separate: config.db_rw_separate || false,
master_num: config.db_master_num || 1,
slave_no: config.db_slave_no
};
conf = extend({}, C('db_ext_config'), config, conf);
return conf;
};
/**
* 根据配置获取对应的数据库实例
* @param {[type]} config [description]
* @return {[type]} [description]
*/
Db.getInstance = function(config){
'use strict';
var conf = this.parseConfig(config);
var instance = thinkRequire(ucfirst(conf.type) + 'Db')(conf);
instance.dbType = conf.type.toUpperCase();
return instance;
}; |