1 var pg = require('pg');
2 var util = require('util');
3 //var co = require('co');
4 var ConnectionParameters = require('pg/lib/connection-parameters');
5 //var http = require('http');
6 var slice = [].slice;
7 /*
8 var cfg = {
9 user: 'postgres',
10 password: 'aaaaaa',
11 port: 5432,
12 host: 'localhost',
13 database: "testdb",
14 };*/
15
16 var getConSql = (cfg) => {
17 return "postgres://" + cfg.user + ":" + cfg.password +
18 "@" + cfg.host + (cfg.port ? ":" + cfg.port : "") +
19 "/" + cfg.database + "";
20 };
21
22 var cfg = app.config.connect.xhc_pg;
23 var master = getConSql(cfg);
24
25 console.dir(master);
26
27 var slaves = master;
28 if (cfg.slaves && util.isArray(cfg.slaves) && cfg.slaves.length > 0) {
29 slaves = getConSql(cfg.slaves[0]);
30 }
31
32 if (cfg.pool && cfg.poolSize) {
33 pg.defaults.poolSize = cfg.poolSize;
34 }
35
36 var Pool = (function() {
37 var queryType = false;
38 var isObject = function(obj) {
39 var type = typeof obj;
40 return type === 'function' || type === 'object' && !!obj;
41 };
42
43 var isArray = Array.isArray || function(obj) {
44 return toString.call(obj) === '[object Array]';
45 };
46 //console.log(format('INSERT INTO info(id, date, json) VALUES (:id, :date, :json)',{id:4,date:"2015-05-14 12:33:33",json:{ab:"d'd'df",data:{a:'df""d',b:"sddf"}}}));
47 //INSERT INTO info(id, date, json) VALUES (3, '2015-05-14 12:33:33', '{"ab":"d''d''df","data":{"a":"df\"\"d","b":"hello"}}')
48 var format = (sql, params) => {
49 params = params || {};
50 return sql.replace(/: ?(\w+)/g, function(item, name) {
51 if (params && params.hasOwnProperty(name)) {
52 var value = params[name];
53 switch (typeof(value)) {
54 case "boolean":
55 return String(value);
56 case "object":
57 return `'${JSON.stringify(value).replace(/\'/g, "''")}'`;
58 case "number":
59 return value;
60 case "string":
61 value = value.replace("'", "''");
62 return `'${value}'`;
63 }
64 }
65 return item;
66 });
67 };
68
69 var query = function(sql, params, optfun) {
70 params = params || {};
71 optfun = optfun || (result => {
72 return result;
73 });
74 return new Promise((resolve, reject) => {
75 var consql = /insert|update|delete/.test(sql.toLowerCase()) ? master : slaves;
76 //console.log(consql);
77 pg.connect(consql, function(err, client, done) {
78 if (err) {
79 reject(new Error('error fetching client from pool'));
80 return;
81 }
82 if (queryType) {
83 if (/:(\w+)/.test(sql)) sql = format(sql, params);
84 client.query(sql, function(err, result) {
85 done();
86 if (err) {
87 client.end();
88 reject(new Error('error running query'));
89 return;
90 }
91 resolve(optfun(result));
92
93 });
94 } else {
95
96 var index = 1,
97 myobj = {},
98 values = [];
99 for (var key in params) {
100 myobj[key] = index;
101 index++;
102 values.push(params[key]);
103 }
104 if(values.length>0)
105 sql = sql.replace(/: ?(\w+)/g, function(item, name) {
106 return "$" + myobj[name];
107 });
108
109 //console.dir(sql);
110 // console.dir(values);
111 client.query(sql, values, function(err, result) {
112 done();
113 if (err) {
114 client.end();
115 reject(new Error('error running query'));
116 return;
117 }
118 //console.dir(result);
119 resolve(optfun(result));
120 });
121 }
122
123
124 });
125 });
126 };
127
128
129
130 return {
131 "query": query,
132 "get": function() {
133 var args = slice.call(arguments);
134 if (args.length == 1) args.push(null);
135 args.push(result => {
136 if (result.rowCount > 0) return result.rows[0];
137 return [];
138 });
139 return query.apply(null, args);
140 },
141 "select": function() {
142 var args = slice.call(arguments);
143 if (args.length == 1) args.push(null);
144 args.push(result => {
145 if (result.rowCount > 0) return result.rows;
146 return [];
147 });
148 return query.apply(null, args);
149 },
150 "format": format,
151 "createSql": function(tname, params, type) {
152 type = type || "insert";
153 if (!tname || tname == "") return "";
154 if (!isObject(params)) return "";
155 var keys = Object.keys(params);
156 var sql = null;
157 switch (type) {
158 case "insert":
159 sql = util.format(`insert into ${tname}(%s) values(%s)`, keys.map(a => {
160 return a;
161 }).join(','), keys.map(a => {
162 return ": " + a;
163 }).join(','));
164 break;
165 case "update":
166 sql = util.format(`update ${tname} set %s `, keys.map(function(a) {
167 return `${a}=: ${a}`;
168 }).join(','));
169 break;
170 }
171 return sql || "";
172 },
173 "writeFailed": function(context, err) {
174 context.body = {
175 "success": false,
176 "msg": err
177 };
178 }
179 };
180 })();
181
182 var api = new Map();
183 api.set("xhcpg", Pool);
184 module.exports = api;
//使用事例
router.post('/topic_banner_update', function*(next) {
var param = this.param;
var parm = {
"tb_id": param["tb_id"],
"tb_type": param["tb_type"],
"tb_url": param["tb_url"],
"tb_image": _tool.imageUrl(param["tb_image"]),
"tb_time_start": _tool.dateStrToNum(param["tb_time_start"]),
"tb_time_stop": _tool.dateStrToNum(param["tb_time_stop"])
};
var sql = Format("update topic_banner set tb_type=: tb_type,tb_url=: tb_url,tb_image=: tb_image,tb_time_start=: tb_time_start,tb_time_stop=: tb_time_stop where tb_id=: tb_id", parm);
console.dir(sql);
yield app.services.xhcpg.query(sql);
this.body = {
success: true
};
});
router.post('/topic_banner_list', function*(next) {
var param = this.param;
var page = param["page"] || 1;
var rows = param["rows"] || 10;
var sql = `
with a as(
select * from topic_banner where t_id = ${param["t_id"]} and tb_status<>-1 order by tb_id desc)
select json_agg(a) json from a`;
// console.dir(sql);
var result = yield app.services.xhcpg.select(sql);
var rows = result[0]["json"] || [];
rows.forEach(function(row) {
row["tb_time_start"] = _tool.numToDateStr2(row["tb_time_start"]);
row["tb_time_stop"] = _tool.numToDateStr2(row["tb_time_stop"]);
});
this.body = {
"total": rows.length,
"rows": rows
};
});
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