继Pablo和LenW之后，这里有一个单行程序，它既准备又执行：

psql-U$PGUSER$PGDB-t-c“从pg_tables中选择'drop table\”'||tablename||'\“cascade；'，其中schemaname='public'”|psql-U$PGUSER$PGDB

注意：设置$PGUSER和$PGDB或将其替换为所需的值

下面是现成的查询：

选择

'drop table if exists "' || tablename || '" cascade;' as pg_drop

FROM

pg_tables

哪里

schemaname='your schema';

为了方便将生成的SQL命令作为一个字符串返回，我稍微修改了Pablo的答案：

select string_agg('drop table "' || tablename || '" cascade', '; ') 
from pg_tables where schemaname = 'public'

如果安装了PL/PGSQL过程语言，则可以使用以下命令删除所有内容，而无需使用shell/Perl外部脚本。

DROP FUNCTION IF EXISTS remove_all();

CREATE FUNCTION remove_all() RETURNS void AS $$
DECLARE
    rec RECORD;
    cmd text;
BEGIN
    cmd := '';

    FOR rec IN SELECT
            'DROP SEQUENCE ' || quote_ident(n.nspname) || '.'
                || quote_ident(c.relname) || ' CASCADE;' AS name
        FROM
            pg_catalog.pg_class AS c
        LEFT JOIN
            pg_catalog.pg_namespace AS n
        ON
            n.oid = c.relnamespace
        WHERE
            relkind = 'S' AND
            n.nspname NOT IN ('pg_catalog', 'pg_toast') AND
            pg_catalog.pg_table_is_visible(c.oid)
    LOOP
        cmd := cmd || rec.name;
    END LOOP;

    FOR rec IN SELECT
            'DROP TABLE ' || quote_ident(n.nspname) || '.'
                || quote_ident(c.relname) || ' CASCADE;' AS name
        FROM
            pg_catalog.pg_class AS c
        LEFT JOIN
            pg_catalog.pg_namespace AS n
        ON
            n.oid = c.relnamespace WHERE relkind = 'r' AND
            n.nspname NOT IN ('pg_catalog', 'pg_toast') AND
            pg_catalog.pg_table_is_visible(c.oid)
    LOOP
        cmd := cmd || rec.name;
    END LOOP;

    FOR rec IN SELECT
            'DROP FUNCTION ' || quote_ident(ns.nspname) || '.'
                || quote_ident(proname) || '(' || oidvectortypes(proargtypes)
                || ');' AS name
        FROM
            pg_proc
        INNER JOIN
            pg_namespace ns
        ON
            (pg_proc.pronamespace = ns.oid)
        WHERE
            ns.nspname =
            'public'
        ORDER BY
            proname
    LOOP
        cmd := cmd || rec.name;
    END LOOP;

    EXECUTE cmd;
    RETURN;
END;
$$ LANGUAGE plpgsql;

SELECT remove_all();

我建议您将其复制到一个文件中，然后使用“--file”或“-f”选项将该文件作为输入传递给psql，而不是在“psql”提示符下键入：

psql -f clean_all_pg.sql

值得称赞的地方：我写了这个函数，但我认为这些查询（至少第一个）来自几年前pgsql邮件列表中的某个人。不记得确切的时间或哪一天。

以防万一。。。清理Postgresql数据库的简单Python脚本

import psycopg2
import sys

# Drop all tables from a given database

try:
    conn = psycopg2.connect("dbname='akcja_miasto' user='postgres' password='postgres'")
    conn.set_isolation_level(0)
except:
    print "Unable to connect to the database."

cur = conn.cursor()

try:
    cur.execute("SELECT table_schema,table_name FROM information_schema.tables WHERE table_schema = 'public' ORDER BY table_schema,table_name")
    rows = cur.fetchall()
    for row in rows:
        print "dropping table: ", row[1]   
        cur.execute("drop table " + row[1] + " cascade") 
    cur.close()
    conn.close()        
except:
    print "Error: ", sys.exc_info()[1]

确保复制后缩进正确，因为Python依赖它。

在pgAdmin中使用此脚本：

DO $$
DECLARE 
    brow record;
BEGIN
    FOR brow IN (select 'drop table "' || tablename || '" cascade;' as table_name from pg_tables where schemaname = 'public') LOOP
        EXECUTE brow.table_name;
    END LOOP;
END; $$