我正在尝试构建一个迁移版本,以在PostgreSQL服务器版本10.2中创建用户定义函数,但是脚本不断抛出错误:
sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) unterminated dollar-quoted string at or near "$body$
select string_agg(convert_to(coalesce(r[2], length(length(r[1])::text) || length(r[1])::text || r[1]), 'SQL_ASCII'), '"
LINE 6: as $body$
^
[SQL: "\n create or replace function naturalsort(text)\n returns bytea\n language sql\n immutable strict\n as $body$ \n select string_agg(convert_to(coalesce(r[2], length(length(r[1])::text) || length(r[1])::text || r[1]), 'SQL_ASCII'), '\x00') from regexp_matches($1, '0*([0-9]+)|([^0-9]+)', 'g') r; \n $body$;\n "] (Background on this error at: http://sqlalche.me/e/f405)
我正在运行的脚本:
def upgrade():
conn = op.get_bind()
conn.execute('DROP FUNCTION IF EXISTS "naturalsort"')
conn.execute("""
create or replace function naturalsort(text)
returns bytea
language sql
immutable strict
as $body$
select string_agg(convert_to(coalesce(r[2], length(length(r[1])::text) || length(r[1])::text || r[1]), 'SQL_ASCII'), '\x00') from regexp_matches($1, '0*([0-9]+)|([^0-9]+)', 'g') r;
$body$;
""")
该代码应允许对列进行自然排序,并且是从rhodium toad复制/粘贴的代码。
由于用美元引号引起来的字符串是重写字符串常量的一种方式,因此替代方法是(请注意,按照PostgreSQL文档中的双单引号引起来:“要在字符串常量中包含单引号字符,请写两个相邻的单引号,例如“ Dianne's horse”。请注意,这与双引号字符(“)。”)不同:
conn.execute("""
create or replace function naturalsort(text)
returns bytea
language sql
immutable strict
as 'select string_agg(convert_to(coalesce(r[2], length(length(r[1])::text) || length(r[1])::text || r[1]), ''SQL_ASCII''), ''\x00'') from regexp_matches($1, ''0*([0-9]+)|([^0-9]+)'', ''g'') r;';
""")
但是这会引发类似的错误:
sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) unterminated quoted string at or near "'select string_agg(convert_to(coalesce(r[2], length(length(r[1])::text) || length(r[1])::text || r[1]), ''SQL_ASCII''), ''"
LINE 6: as 'select string_agg(convert_to(coalesce(r[2], leng...
^
[SQL: "\n create or replace function naturalsort(text)\n returns bytea\n language sql\n immutable strict\n as 'select string_agg(convert_to(coalesce(r[2], length(length(r[1])::text) || length(r[1])::text || r[1]), ''SQL_ASCII''), ''\x00'') from regexp_matches($1, ''0*([0-9]+)|([^0-9]+)'', ''g'') r;';\n "] (Background on this error at: http://sqlalche.me/e/f405)
奇怪的是,这些查询在pgAdmin中执行得很好,而alembic似乎会生成有效的SQL(高级升级:--sql):
DROP FUNCTION IF EXISTS "naturalsort";
create or replace function naturalsort(text)
returns bytea
language sql
immutable strict
as $body$
select string_agg(convert_to(coalesce(r[2], length(length(r[1])::text) || length(r[1])::text || r[1]), 'SQL_ASCII'), '') from regexp_matches($1, '0*([0-9]+)|([^0-9]+)', 'g') r;
$body$;;
UPDATE alembic_version SET version_num='ad99fdcb28bc' WHERE alembic_version.version_num = 'ff00ac684617';
COMMIT;
有什么线索可以解释为什么psycopg2不断抛出unterminated dollar-quoted string at or near "$body$
错误?
答案 0 :(得分:1)
def upgrade():
op.execute('DROP FUNCTION IF EXISTS "naturalsort"')
op.execute("""
create or replace function naturalsort(text)
returns bytea
language sql
immutable strict
as $my_body$
select string_agg(convert_to(coalesce(r[2], length(length(r[1])::text) || length(r[1])::text || r[1]), 'SQL_ASCII'), '') from regexp_matches($1, '0*([0-9]+)|([^0-9]+)', 'g') r;
$my_body$;;
""")
def downgrade():
op.execute('DROP FUNCTION IF EXISTS "naturalsort"')
执行升级时,升级成功,语法没有错误。 实际上在postgres中执行该函数还会使用以下查询返回所需的naturalsort结果:
SELECT * FROM public.requirement ORDER BY naturalsort(eid) asc
使用PvdL关于my_body
的评论部分起作用,如果我在空字符串现在(在'\x00'
之后)添加SQL_ASCII
,则会引发语法错误 >
答案 1 :(得分:0)
$body
是一个别名,不能包含$,将$body$
替换为my_body
之类的名称,它应该可以工作