大家好,我是考100分的小小码 ,祝大家学习进步,加薪顺利呀。今天说一说PostgreSQL:查询元数据(表 、字段)信息、库表导入导出命令[亲测有效],希望您对编程的造诣更进一步.
一、查询表、模式及字段信息
1、查询指定模式下的所有表
select tablename,*
from pg_tables
where schemaname = "ods";
2、查询指定模式下的表名及字段
SELECT
C.relname,
A.attname AS NAME,
format_type ( A.atttypid, A.atttypmod ) AS TYPE,
col_description ( A.attrelid, A.attnum ) AS COMMENT
FROM
pg_class AS C,
pg_attribute AS A,
pg_tables AS B
WHERE A.attrelid = C.oid
and C.relname=B.tablename
AND A.attnum > 0
AND B.schemaname = "ods"
AND B.tablename NOT SIMILAR TO "[a-z,_]+_2022[0-9]+";
3、查询包含指定字段的表
SELECT DISTINCT
C.relname
FROM
pg_class AS C,
pg_attribute AS A,
pg_tables AS B
WHERE A.attrelid = C.oid
and C.relname=B.tablename
AND A.attnum > 0
AND B.schemaname = "ods"
AND B.tablename NOT SIMILAR TO "[a-z,_]+_2022[0-9]+"
AND A.attname ="dt";
4、查询指定表的字典(表名、字段名、备注、类型)
select
c.relname as 表名,
obj_description(relfilenode, "pg_class")::varchar as 表注释,
d.description as 字段备注,
a.attname as 字段名,
concat_ws ("", t.typname,SUBSTRING (format_type (a.atttypid,a.atttypmod) from"(.*)")) as 字段类型
from
pg_class c,
pg_attribute a,
pg_type t,
pg_description d
where a.attnum > 0
and a.attrelid = c.oid
and a.atttypid = t.oid
and d.objoid = a.attrelid
and d.objsubid = a.attnum
and c.relname in (select tablename from pg_tables where schemaname = "ap")
and c.relname = "fact_ito"
查询非分区表:and position (“_2” in tablename) = 0
二、会话及锁信息
1、查询所有会话
SELECT sa.* FROM pg_catalog.pg_stat_activity sa
三、导入导出命令
1、数据库导入导出
(1)从源数据库导出结构
pg_dump --host=172.16.6.219 --port=5432 --username=postgres --dbname=bigdata --if-exists --clean --no-privileges --no-owner --schema-only --file=bigdata_20220815.sql
(2)从源数据库导出结构和数据
sudo pg_dump --host=172.16.6.219 --port=5432 --username=postgres --dbname=kettle --if-exists --clean --no-privileges --no-owner --file=kettle_20221110.sql
(3)从文件导入目标数据库
sudo psql --host=localhost --port=5432 --username=postgres --file=kettle_20221110.sql --dbname=kettle
2、模式导入导出
(1)导出模式结构
sudo pg_dump --host=172.16.6.219 --port=5432 --username=postgres --dbname=bigdata --schema=ods --if-exists --clean --no-privileges --no-owner --schema-only --file=schema_bigdata_ods_20221110.sql
(2)导出模式结构和数据
sudo pg_dump --host=172.16.6.219 --port=5432 --username=postgres --dbname=bigdata --schema=ods --if-exists --clean --no-privileges --no-owner --file=bigdata_ods_20221110.sql
(3)从文件导入模式
sudo psql --host=172.16.6.219 --port=5432 --username=postgres --file=bigdata_ods_20221110.sql --dbname=bigdata
3、表导入导出
(1)导出源表结构
pg_dump --username=postgres --host=172.16.5.66 --port=5432 --dbname=bigdata --if-exists --clean --schema-only --no-privileges --no-owner --file=dim_area_value.sql --table=ap.dim_area_value
(2)导出源表数据和结构
pg_dump --username=postgres --host=172.16.5.66 --port=5432 --dbname=bigdata --if-exists --clean --no-privileges --no-owner --file=dim_area_value.sql --table=ap.dim_area_value
(3)从文件导入至目标表
psql --host=112.94.20.4 --port=5432 --username=postgres --file=dim_area_value.sql --dbname=bigdata
4、免密配置
5、实际执行的命令
(1)导入
COPY ap.analysis_operating_expenses_details (amount, level_one_name,
level_two_name, level_three_name,
level_four_name, name, date,
organization_name, organization_name_short,
dim_customer_name, customer_type, cus_industry,
staff_name, cus_manage_code) FROM stdin;
(2)导出
COPY ap.fact_ship_20221031 (order_no, order_line_no, produce_no,
ship_no, cus_code, product_code,
sales_area_code, sales_organize_code,
sales_scene, ship_quantity, receipt_quantity,
receipt_baseline, receipt_baseline_days,
forecast_receipt_date, forecast_income_date,
ship_date, production_cost_baseline, price,
receipt_overdue_flag, receipt_overdue_level,
income_rule, dt, warehouse_code, staff_code,
contract_type, confirm_rule, material_cost_baseline,
artificial_cost_baseline, manufacture_cost_baseline,
cus_biz_no, not_tax_price, not_tax_authorize_price,
ship_row) TO stdout;
本文来自思创斯聊编程,作者:哥们要飞,转载请注明原文链接:https://www.cnblogs.com/liujinhui/p/16880860.html
原文地址:https://www.cnblogs.com/liujinhui/archive/2022/11/11/16880860.html
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