是否可以将值从 PYODBC 传递给表类型参数到 SQL Server? [英] Is it possible to pass values to a table type parameter from PYODBC to SQL Server?

问题描述

我创建了一个测试类型作为包含以下列的表格:

I created a test type as a table with the below columns:

CREATE TYPE [dbo].[TestType] AS TABLE
                                (
                                    [TestField] [varchar](10) NULL,
                                    [TestField2] [int] NULL
                                )

然后我创建了一个存储过程，将该表类型作为参数.

I then created a stored procedure the takes that table type as a parameter.

CREATE PROCEDURE TestTypeProcedure (@tt TestType READONLY)
AS
    SELECT *
    FROM @tt;

我的目标是能够传递类似列表的列表作为表类型的参数.这可能吗?

My goal is to be able to pass something like a list of lists as the parameter for the table type. Is that even possible?

myList = [['Hello!', 1], ['Goodbye!', 2]]
....
cursor.execute('{{Call {TestTypeProcedure} ({?})}}', myList)

推荐答案

pyodbc.ProgrammingError: ('SQL 包含 1 个参数标记，但提供了 2 个参数', 'HY000')

pyodbc.ProgrammingError: ('The SQL contains 1 parameter markers, but 2 parameters were supplied', 'HY000')

您收到该错误是因为表值参数是一个可迭代列表(最好是元组)...

You are getting that error because a table-valued parameter is a list of iterables (preferably tuples) ...

my_tvp = [('Hello!', 1), ('Goodbye!', 2)]
print(f"my_tvp contains {len(my_tvp)} row(s)")
# my_tvp contains 2 row(s)

...如果你直接将它传递给 .execute() 那么每一行都被解释为一个参数值:

... and if you pass that directly to .execute() then each row is interpreted as a parameter value:

sql = "{CALL TestTypeProcedure (?)}"
params = my_tvp
print(f"calling SP with {len(params)} parameter value(s)")
# calling SP with 2 parameter value(s)
crsr.execute(sql, params)  # error

因此，您需要将您的 tvp 包裹在一个元组中以使其成为单个参数值

Therefore, you need to wrap your tvp inside a tuple to make it a single parameter value

sql = "{CALL TestTypeProcedure (?)}"
params = (my_tvp, )  # tuple containing a single tvp "object"
print(f"calling SP with {len(params)} parameter value(s)")
# calling SP with 1 parameter value(s)
crsr.execute(sql, params)  # no error

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