在上篇文章給大家介紹了如何將postgresql數據庫表內數據導出為excel格式(推薦) 感興趣的朋友點擊查看。
本文主要用于介紹如何使用copy或者\copy命令將postgresql數據庫內表的數據導出為excel格式，方便用戶查看編輯。
copy命令同\copy命令語法上相同，區別在于copy必須使用能夠超級用戶使用,copy … to file 中的文件都是數據庫服務器所在的服務器上的文件，而\copy 一般用戶即可執行且\copy 保存或者讀取的文件是在客戶端所在的服務器。本文主要以copy命令作為介紹重點，使用copy命令將表內數據倒為csv格式文件即為excel格式。
1、copy命令語法
COPY { 表名 [ ( 列名稱 [, ...] ) ] | ( 查詢 ) }
TO { '文件名' | PROGRAM '命令' | STDOUT }
[ [ WITH ] ( 選項 [, ...] ) ]
選項可以是下列內容之一
FORMAT 格式_名稱
FREEZE [ 布爾 ]
DELIMITER '分隔字符'
NULL '空字符串'
HEADER [ 布爾 ]
QUOTE '引用字符'
ESCAPE '轉義字符'
FORCE_QUOTE { ( 列名稱 [, ...] ) | * }
FORCE_NOT_NULL ( 列名稱 [, ...] )
FORCE_NULL ( 列名稱 [, ...] )
ENCODING 'encoding_name(編碼名)'
2、多場景使用介紹
①查看現有表數據
test=# select * from test;
user_id | user_name | age | gender | remark
---------+---------------+-----+--------+----------------------------------------------
1 | Jackie Chan | 45 | male | "police story","project A","rush hour"
3 | Brigitte Li | 46 | female |
4 | Maggie Cheung | 39 | female |
5 | Jet Li | 41 | male | "Fist of Legend","Once Upon a Time in China"
2 | Gong Li | 38 | female | "Farewell My Concubine","Lifetimes Living"
(5 行記錄)
②帶列名導出，默認情況下使用，作為分隔符
test=# copy test to '/tmp/test1.csv' with csv header;
COPY 5
test=# \!! cat /tmp/test1.csv
user_id,user_name,age,gender,remark
1,Jackie Chan,45,male,"""police story"",""project A"",""rush hour"""
3,Brigitte Li,46,female,
4,Maggie Cheung,39,female,
5,Jet Li,41,male,"""Fist of Legend"",""Once Upon a Time in China"""
2,Gong Li,38,female,"""Farewell My Concubine"",""Lifetimes Living"
③帶列名導出，指定使用|作為分隔符
test=# copy test to '/tmp/test1.csv' with csv header DELIMITER '|';
COPY 5
test=# \!! cat /tmp/test1.csv
user_id|user_name|age|gender|remark
1|Jackie Chan|45|male|"""police story"",""project A"",""rush hour"""
3|Brigitte Li|46|female|
4|Maggie Cheung|39|female|
5|Jet Li|41|male|"""Fist of Legend"",""Once Upon a Time in China"""
2|Gong Li|38|female|"""Farewell My Concubine"",""Lifetimes Living"
④帶列名導出，將空字符替換為指定值導出
test=# copy test to '/tmp/test1.csv' with csv header null 'to be supplemented';
COPY 5
test=# \!! cat /tmp/test1.csv
user_id,user_name,age,gender,remark
1,Jackie Chan,45,male,"""police story"",""project A"",""rush hour"""
3,Brigitte Li,46,female,to be supplemented
4,Maggie Cheung,39,female,to be supplemented
5,Jet Li,41,male,"""Fist of Legend"",""Once Upon a Time in China"""
2,Gong Li,38,female,"""Farewell My Concubine"",""Lifetimes Living"
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