Node.js访问PostgresQL数据库

Node.js访问PostgresQL数据库，安装PostgresQL模块：进入到/usr/local/lib：发现有一个node_schedules目录，里面放的是你安装的模

1）安装PostgresQL模块：
进入到/usr/local/lib：发现有一个node_schedules目录，里面放的是你安装的模块

npm install -g node_gyp
export $PATH=$PATH:/usr/local/pgsql/bin/
npm install pg //-g 表示全局

2）连接数据库并访问
连接字符串=“tcp:// 用户名 : 密码 @localhost:5432/ 库名”;

1） 事件形式：
var pg = require('pg');
var MATH = require('math');
var constring = "tcp://postgres:1234@localhost/my";

var client = new pg.Client(constring);
client.connect();

client.query("create temp table beatle(name varchar(10),height integer)");
client.query("insert into beatle(name,height) values('john',50)");
client.query("insert into beatle(name,height) values($1,$2)",['brown',68]);
var query = client.query("select * from beatle");

query.on('row',function(row){
console.log(row);
console.log("Beatle name:%s",row.name);
console.log("beatle height:%d' %d\"",MATH.floor(row.height/12),row.height%12);
});

query.on('end',function(){
client.end();
});

测试成功，输出内容为：
{ name: 'john', height: 50 }
Beatle name:john
beatle height:4' 2"
{ name: 'brown', height: 68 }
Beatle name:brown
beatle height:5' 8"

2）回调函数形式：
var pg = require('pg');

var conString = "tcp://postgres:1234@localhost/my";

var client = new pg.Client(conString);
client.connect(function(err) {
client.query('SELECT NOW() AS "theTime"', function(err, result) {
console.log(result.rows[0].theTime);
client.end();
})
});

测试成功，输出结果为：
Wed Jan 23 2013 14:30:12 GMT+0800 (CST)

3） 用回调方式实现上面的事件形式：
var pg = require('pg');
var MATH = require('math');
var constring = "tcp://postgres:1234@localhost/my";

var client = new pg.Client(constring);

client.connect(function(err){
client.query("create temp table beatle(name varchar(10),height integer)");
client.query("insert into beatle(name,height) values('john',50)");
client.query("insert into beatle(name,height) values($1,$2)",['brown',68]);
client.query("select * from beatle ",function(err,result){
console.log(result);
for(var i=0;i {
console.log(result.rows[i]);
console.log("Beatle name:%s",result.rows[0].name);
console.log("beatle height:%d' %d\"",MATH.floor(result.rows[0].height/12),result.rows[0].height%12);
}
client.end();
});
});

测试成功，，输出结果为：
{ command: 'SELECT',
rowCount: 2,
oid: NaN,
rows: [ { name: 'john', height: 50 }, { name: 'brown', height: 68 } ] }
{ name: 'john', height: 50 }
Beatle name:john
beatle height:4' 2"
{ name: 'brown', height: 68 }
Beatle name:john

beatle height:4' 2"

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