Python sqlalchemy编译器问题
我有一个定制的InsertFromSelect类,它完全按照它的名称执行。输出查询正是我所需要的,问题是我似乎无法执行它 类别:Python sqlalchemy编译器问题,python,sqlalchemy,Python,Sqlalchemy,我有一个定制的InsertFromSelect类,它完全按照它的名称执行。输出查询正是我所需要的,问题是我似乎无法执行它 类别: from sqlalchemy.ext.compiler import compiles from sqlalchemy.sql.expression import Executable, ClauseElement class InsertFromSelect( Executable, ClauseElement ): def __init__( self
from sqlalchemy.ext.compiler import compiles
from sqlalchemy.sql.expression import Executable, ClauseElement
class InsertFromSelect( Executable, ClauseElement ):
def __init__( self, table, select ):
self.table = table
self.select = select
@compiles( InsertFromSelect )
def visit_insert_from_select( element, compiler, **kw ):
return "INSERT INTO %s (%s)" % (
compiler.process(element.table, asfrom=True),
compiler.process(element.select)
)
查询:
import proxy.lib.sqlalchemy.compilers.insertFromSelect as ifs
from sqlalchemy import not_, literal_column, String, text
from proxy.database import engine
ifsTest = ifs.InsertFromSelect(
user_ip_table,
select(
[
user.id,
ips_table.c.id, literal_column( "'inactive'", String ),
literal_column( "'"+service_type+"'", String )
]
).where(
not_( ips_table.c.id.in_(
select(
[user_ip_table.c.ip_id]
)
) )
).where(
ips_table.c.ip_address.in_( validIps )
)
)
查询输出(打印ifsTest):
我已经针对数据库手动测试了查询(当然使用了params),它生成了我所需要的内容,但我似乎无法使用sqlalchemy执行它
I've tried:
connection = engine.connect()
res = connection.execute( ifsTest )
connection.close()
……但没有插入任何内容。知道我该怎么做吗?既然您没有使用事务,请在您的构造中添加“自动提交”选项:
class InsertFromSelect( Executable, ClauseElement ):
_execution_options = \
Executable._execution_options.union({'autocommit': True})
def __init__( self, table, select ):
self.table = table
self.select = select
或者明确地称之为:
connection.execution_options(autocommit=True).execute(mystatement)
或使用交易:
trans = connection.begin()
connection.execute(...)
trans.commit()
背景:
我认为这里没有什么可承诺的。
trans = connection.begin()
connection.execute(...)
trans.commit()