如果你会使用psql，你可以使用\gexec元命令来执行查询输出;

SELECT
    format('TRUNCATE TABLE %I.%I', ns.nspname, c.relname)
  FROM pg_namespace ns 
  JOIN pg_class c ON ns.oid = c.relnamespace
  JOIN pg_roles r ON r.oid = c.relowner
  WHERE
    ns.nspname = 'table schema' AND                               -- add table schema criteria 
    r.rolname = 'table owner' AND                                 -- add table owner criteria
    ns.nspname NOT IN ('pg_catalog', 'information_schema') AND    -- exclude system schemas
    c.relkind = 'r' AND                                           -- tables only
    has_table_privilege(c.oid, 'TRUNCATE')                        -- check current user has truncate privilege
  \gexec 

注意，\gexec是在9.6版本中引入的

我在这里没有看到的一件事是截断然后重置序列。请注意，像这里给出的所有截断一样，简单的截断只会截断表，但会使序列保持截断前的值。要在截断do时将序列重置为起始值:

TRUNCATE TABLE table_name RESTART IDENTITY CASCADE;

你可以把这个RESTART IDENTITY添加到任何你想要的答案中，没有必要在这里重复。CASCADE是针对您可能面临的任何外键约束的。

清洗AUTO_INCREMENT版本:

CREATE OR REPLACE FUNCTION truncate_tables(username IN VARCHAR) RETURNS void AS $$
DECLARE
    statements CURSOR FOR
        SELECT tablename FROM pg_tables
        WHERE tableowner = username AND schemaname = 'public';
BEGIN
    FOR stmt IN statements LOOP
        EXECUTE 'TRUNCATE TABLE ' || quote_ident(stmt.tablename) || ' CASCADE;';

        IF EXISTS (
            SELECT column_name 
            FROM information_schema.columns 
            WHERE table_name=quote_ident(stmt.tablename) and column_name='id'
        ) THEN
           EXECUTE 'ALTER SEQUENCE ' || quote_ident(stmt.tablename) || '_id_seq RESTART WITH 1';
        END IF;

    END LOOP;
END;
$$ LANGUAGE plpgsql;

如果我必须这样做，我将简单地创建当前db的schema sql，然后删除并创建db，然后用schema sql加载db。

以下是所涉及的步骤:

1)创建数据库的模式转储(——Schema -only)

Pg_dump mydb -s > schema.sql

2)删除数据库

删除mydb数据库;

3)创建数据库

创建mydb数据库

4)导入模式

PSQL myDB < schema.sql

只需执行下面的查询:

DO $$ DECLARE
    r RECORD;
BEGIN
    FOR r IN (SELECT tablename FROM pg_tables WHERE schemaname = current_schema()) LOOP
        EXECUTE 'TRUNCATE TABLE ' || quote_ident(r.tablename) || '';
    END LOOP;
END $$;

如果你会使用psql，你可以使用\gexec元命令来执行查询输出;

SELECT
    format('TRUNCATE TABLE %I.%I', ns.nspname, c.relname)
  FROM pg_namespace ns 
  JOIN pg_class c ON ns.oid = c.relnamespace
  JOIN pg_roles r ON r.oid = c.relowner
  WHERE
    ns.nspname = 'table schema' AND                               -- add table schema criteria 
    r.rolname = 'table owner' AND                                 -- add table owner criteria
    ns.nspname NOT IN ('pg_catalog', 'information_schema') AND    -- exclude system schemas
    c.relkind = 'r' AND                                           -- tables only
    has_table_privilege(c.oid, 'TRUNCATE')                        -- check current user has truncate privilege
  \gexec 

注意，\gexec是在9.6版本中引入的