Question

我在查询中发送了一个电子邮件列表，但是我得到一个错误，说它无法处理超过2100，我肯定有更多可能是这个数量的三倍。如何批处理并处理此批处理？

sql = """with x as ( \
                            select \
                                job_id, \
                                avg_runtime, \
                                j.id, \
                                row_number() over (partition by ja.job_id order by ja.id desc) rn \
                            from job_activity as ja   \
                            join job as j on ja.job_id = j.id  \
                            where \
                                j.name in ({0})  and \
                                ja.avg_runtime <> 0 and \
                                ja.avg_runtime is not null ) \
                            select \
                                job_id, \
                                avg_runtime, \
                                id \
                            from x where rn = 1 ";"""



            params = ",".join(map(lambda x: "?", flagged_job_names))
            dataSet = data.Engine.execute(sql.format(params), flagged_job_names)
            dataSet.fetchall()

Answer 1

以下是我们的工作：

以逗号分隔的字符串
使用转弯下方的tvf到相当于一个表
使用常规联接声明

下面的伪代码：

DECLARE @emails varchar(max);
SET @emails = 'foo@foo.com;bar@foo.com';

SELECT *
FROM table1 t
   INNER JOIN dbo.tvf_splitParam(@emails, ',') tvf ON (t.email = tvf.value)





ALTER FUNCTION [dbo].[tvf_SplitParam](
    @RepParam nvarchar(max), 
    @Delim char(1)= ','
)
RETURNS @VALUES TABLE (value nvarchar(max))AS
   BEGIN
   DECLARE @chrind INT
   DECLARE @Piece nvarchar(max)
   SELECT @chrind = 1
   WHILE @chrind > 0
      BEGIN
         SELECT @chrind = CHARINDEX(@Delim,@RepParam)
         IF @chrind > 0
            SELECT @Piece = LEFT(@RepParam,@chrind - 1)
         ELSE
            SELECT @Piece = @RepParam
         INSERT @VALUES(value) VALUES(@Piece)
         SELECT @RepParam = RIGHT(@RepParam,LEN(@RepParam) - @chrind)
         IF LEN(@RepParam) = 0 BREAK
      END
   RETURN
END

Answer 2

对于SQL Server 2012，您可以使用table valued parameters：

-- How to create an array for storing emails ? (SQL2008+)
CREATE TYPE dbo.StringArray AS TABLE ( 
    Value NVARCHAR(100) NOT NULL 
);
GO

-- How to create a procedure having this array as parameter ?
CREATE PROCEDURE dbo.DoSomething (
    @emails dbo.StringArray READONLY
)
AS
BEGIN 
    SELECT  *
    FROM    dbo.Person p
    WHERE   p.Email IN (SELECT  v.Value FROM @emails v)
END;
GO

-- How to call this procedure ?
DECLARE @param dbo.StringArray
INSERT  @param 
VALUES  ('email1@yahoo.com'), ('email2@google.com'), ('email3@yuhuu.com')

EXEC dbo.DoSomething @emails = @param

注意：Erland Sommarskog编译了一个用于在SQL Server here中存储/传递数组的解决方案的综合列表。

SQL - 创建批处理 - 2100 LIMIT

2 个答案: