调试BigQuery存储过程 [英] Debugging BigQuery Stored procedure

问题描述

有什么方法可以在BigQuery存储过程中使用打印语句吗?我有一个类似下面的存储过程，我想看看如何生成SQL语句来调试问题，或者通过其他更好的方法来调试正在生成的存储过程等.

Is there any way I can use print statements within BigQuery stored procedure? I have a stored procedure like below, I like to see how SQL statement is generated to debug the issue or any other better way to debug what stored procedure is producing etc.

CREATE OR REPLACE PROCEDURE `myproject.TEST.check_duplicated_prc`(project_name STRING, data_set_name STRING, table_name STRING, date_id DATE)
BEGIN
  DECLARE sql STRING;
  set sql ='Select date,col1,col2,col3,count(1) from `'||project_name||'.'||data_set_name||'.'||table_name|| '` where date='||date_id ||' GROUP BY date,col1,col2,col3 HAVING COUNT(*)>1';
    --EXECUTE IMMEDIATE (sql);
    print(sql)
END;

推荐答案

有许多方法可以对存储过程进行调试/故障排除

There are number of approaches for debugging / troubleshooting stored proc

最简单的方法之一-查看SQL语句的生成方式-稍微调整存储的过程，如以下示例所示

One of the simplest - to see how SQL statement is generated - slightly adjust your stored proc as in below example

CREATE OR REPLACE PROCEDURE `myproject.TEST.check_duplicated_prc`(project_name STRING, data_set_name STRING, table_name STRING, date_id DATE, OUT sql STRING)
BEGIN
  -- DECLARE sql STRING;
  set sql ='Select date,col1,col2,col3,count(1) from `'||project_name||'.'||data_set_name||'.'||table_name|| '` where date='||date_id ||' GROUP BY date,col1,col2,col3 HAVING COUNT(*)>1';
    --EXECUTE IMMEDIATE (sql);
END;   

然后，您可以在下面运行以查看生成的SQL

Then, you can run below to see generated SQL

DECLARE sql STRING;
CALL `myproject.TEST.check_duplicated_prc`('project_name', 'data_set_name', 'table_name', '2020-11-24', sql);
SELECT sql;    

有输出

正如您在这里看到的那样-您在这里缺少撇号 where date = 2020-11-24 ，因此您可以修复存储的proc

As you can see here - you are missing apostrophes here where date=2020-11-24 so you can fix your stored proc

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