Question

我想将整个数据库导出到aws S3以便以后导入到BI工具中。我需要将每个数据库表导出到自己的csv文件中。但我不想手动做或做一些脚本。 MySQL have something for this。有没有一种简单的方法来实现Postgresql？

Answer 1

使用此查询，您可以列出架构public中的所有表：

select table_schema, table_name 
from information_schema.tables
where table_type = 'BASE TABLE'
and table_schema = 'public';

您可以在函数中使用查询，该函数将为每个table_name执行适当的copy命令：

create or replace function copy_my_tables ()
returns void language plpgsql as $$
declare
    r record;
begin
    for r in
        select table_schema, table_name 
        from information_schema.tables
        where table_type = 'BASE TABLE'
        and table_schema = 'public'
    loop
        execute format ('copy %s.%s to ''c:\data\%s_%s.csv'' (format csv)',
            r.table_schema, r.table_name, r.table_schema, r.table_name);
    end loop;
end $$;

select copy_my_tables();

Answer 2

我们可以使用bash脚本中的Header和bash脚本

将所有表导出到单独的csv中

#set -x
read -p "Please provide Schema name   " Schema
if [ -z $Schema ]
then
    echo "No Schema name provided set default schema public."
Schema=public
fi
read -p "Please provide Database name  " Db
if [ -z $Db ]
then
    echo "No Database name provided set default database postgres."
Db=postges
fi
read -p "Please provide Postgres Role/User name  " User
if [ -z $User ]
then
    echo "No User/Role name provided set default User?Role postgres."
User=postgres
fi

echo " Schema Name is-->$Schema   Database Name--> $Db   User Name-->$User "

psql -U $User -h localhost -Atc "select tablename from pg_tables where schemaname='$Schema'" $Db |\
  while read TABLENAME; do
        echo "$TABLENAME"
    psql -U $User -h localhost -c "COPY $Schema.$TABLENAME TO STDOUT WITH CSV HEADER" $Db  > $TABLENAME.csv
  done

在上面提到的脚本中你必须提供架构数据库和用户/角色如果需要提供端口和主机名，则可以使用-p和-h Option

Postgresql：如何将表导出到单独的csv文件

2 个答案: