Postgresql 记事

Date:2012-12-13

Env:Postgresql 9.2,pgAdmin3

1.//字段包含大写时导致插入失败

创建表(从pgAdmin3截取):

CREATE TABLE county
(
  "provinceId" character(2) NOT NULL,"cityId" character(2) NOT NULL,"countyId" character(2) NOT NULL,"countyName" character varying(20) NOT NULL,CONSTRAINT cou_pk PRIMARY KEY ("provinceId","cityId","countyId")
)

执行sql:

INSERT INTO county (provinceId,cityId,countyId,countyName)  VALUES ('11','02','29','延庆县')

结果:pgAdmin3提示:错误: 关系 "county" 的 "provinceid" 字段不存在
sql 状态: 42703

分析与修正:Postgresl字段或表名不加引号是不区分大小写，如果字段或表名有大小写就必须加引号.建议字段命名方式:xxx_xxx,用"_"分隔.

2.//pg保留前导零,效果类似MysqL的int(M)

chenhao=> select to_char(1,'00');
 to_char 
---------
  01
(1 row)

3.//integer保存unix时间戳的2038bug

原因:32位的数从0-0xFFFFFFFF秒，大概到2038年unix时间戳将会溢出.Fix:使用bigint.

Postgre资料汇总

http://francs3.blog.163.com/blog/static/405767272014017341219/