SQL Server 中的 R:将数据框输出到表中 [英] R in SQL Server: Output data frame into a table

问题描述

这可能有一个简单的答案，但我无法弄清楚，因为我仍然掌握在 SQL Server 中使用 R 的窍门.我有一段代码从 SQL Server 表中读取数据，在 R 中执行并返回一个数据框.

This probably has a simple answer but I cannot figure it out as I'm still getting a hang of working with R in SQL Server. I have a piece of code that reads in data from a SQL Server table, executes in R and returns a data frame.

execute sp_execute_external_script
    @language=N'R',
    @script=N'inp_dat=InputDataSet
    inp_dat$NewCol=max(inp_dat$col1,inp_dat$col2)
    new_dat=inp_dat
    OutputDataSet=new_dat'
    @input_data_1=N'select * from IM_COMP_TEST_SQL2016.dbo.temp_table';

我想将 new_dat 插入到 SQL Server 表中(从 new_dat 选择 * 到 new_table).我该怎么做?提前致谢.

I want to insert new_dat into a SQL Server table (select * into new_table from new_dat). How do I go about this? Thanks in advance.

推荐答案

如图所示 教程，您可以在之前创建的列对齐的表中使用 INSERT INTO ... EXEC脚本的数据帧返回:

As shown in this tutorial, you can use INSERT INTO ... EXEC in a previously created table with columns aligning to script's dataframe return:

INSERT INTO Table1
execute sp_execute_external_script
    @language=N'R',
    @script=N'inp_dat <- InputDataSet
              inp_dat$NewCol <- max(inp_dat$col1,inp_dat$col2)
              new_dat <- inp_dat',
    @input_data_1=N'SELECT * FROM IM_COMP_TEST_SQL2016.dbo.temp_table',
    @output_data_1=N'newdat';

但是，要使用生成表查询可能需要 OPENQUERY() 或 OPENROWSET() 使用此 SO Post 返回存储过程的输出:

However, to use the make-table query may require OPENQUERY() or OPENROWSET() using an ad-hoc distributed query as described in this SO Post to return the output of stored procedure:

存储过程

CREATE PROCEDURE dbo.R_DataFrame

AS

BEGIN
    execute sp_execute_external_script
        @language=N'R',
        @script=N'inp_dat <- InputDataSet
                  inp_dat$NewCol <- max(inp_dat$col1,inp_dat$col2)
                  new_dat <- inp_dat',
        @input_data_1=N'SELECT * FROM IM_COMP_TEST_SQL2016.dbo.temp_table',
        @output_data_1=N'newdat';

        -- ADD ALL COLUMN TYPES;
        WITH RESULT SETS (("newdat" [col1] varchar(20), [col2] double, [col3] int ...));
END
GO

操作查询

SELECT * INTO Table1 
FROM OPENROWSET('SQLNCLI', 'Server=(local);Trusted_Connection=yes;',
                'EXEC dbo.R_DataFrame')

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