Trying to run Describe table and running RESULT_SCAN on the query id of the describe table query.
Procedure:
var qry = ` describe table TEST_TABLE `;
var qry_rslt = snowflake.execute({sqlText: qry});
var qry_id= qry_rslt.getQueryId();
var qry2 = ` select * from table(result_scan('`+qry_id+`')) `
snowflake.execute({sqlText: qry2});
The procedure is returning Null and not running the SQL. On manually running the result scan query it says statement not found.
ANy idea how to read describe result.
You're not actually reading the results of the second query. It's running it but not collecting the results. This will collect the first column only of the result set:
create or replace procedure test()
returns string
language javascript
as
$$
var qry = ` describe table TEST_TABLE `;
var qry_rslt = snowflake.execute({sqlText: qry});
var qry_id= qry_rslt.getQueryId();
var qry2 = ` select * from table(result_scan('${qry_id}')) `;
rs = snowflake.execute({sqlText: qry2});
var out = "";
var i = 0;
while (rs.next()) {
if (i++ > 0) out += ",";
out += rs.getColumnValue(1);
}
return out;
$$;
call test();
Are you looking to get the entire DDL in one statement? If so you can run get_ddl and then read just the first row, first column. It will have the DDL for the entire table. If you want it as a table, you'll need to read the rows and columns to do what needs to be done with them.
Related
i'm working with Snowflake,
i created this Stored Procedure, it's purpose is to do the following steps:
extract the relevant 'application_id' values from the SQL query
use a FOR loop over a SQL query, with the 'application_id' values that i extracted
in step 1, and delete the relevant rows from the target table.
when i call the Stored Procedure, it runs without errors, but it doesn't do anything ( the relevant records are not been deleted).
i added my SP code,
please let me know if you see any syntax / logic errors,
thanks
CREATE OR REPLACE PROCEDURE DWH.sp_testing()
RETURNS string
LANGUAGE javascript
strict
EXECUTE AS owner
AS
$$
try
{
var application_list = ` SELECT application_id
FROM PUBLIC.my_source_table_name
WHERE my_flag = 1
`
var query_statement = snowflake.createStatement({sqlText: application_list});
var application_list_result = query_statement.execute();
for (i = 1; i <= query_statement.getRowCount(); i++)
{
application_list_result.next()
application_id = application_list_result.getColumnValue(1)
var delete_daily_records = `
DELETE FROM PUBLIC.my_target_table_name AS target
WHERE target.application_id = ${application_id}
`
snowflake.execute({sqlText: delete_daily_records});
}
}
catch (err)
{
throw "Failed: " + err;
}
$$
;
CALL DWH.sp_testing();
Are you sure your query is returning data? Also are you sure the target table has data matching your DELETE statement?
The following test works for me using your stored procedure:
select count(*) from citibike_trips where end_station_id=6215;
returns: 14565
Now, I created your stored proc:
CREATE OR REPLACE PROCEDURE sp_testing()
RETURNS string
LANGUAGE javascript
strict
EXECUTE AS owner
AS
$$
try
{
var application_list = `SELECT end_station_id
FROM citibike_trips
WHERE end_station_id=6215 limit 10
`
var query_statement = snowflake.createStatement({sqlText: application_list});
var application_list_result = query_statement.execute();
for (i = 1; i <= query_statement.getRowCount(); i++)
{
application_list_result.next()
end_station_id = application_list_result.getColumnValue(1)
var delete_daily_records = `
DELETE FROM citibike_trips AS target
WHERE target.end_station_id = ${end_station_id}
`
snowflake.execute({sqlText: delete_daily_records});
}
}
catch (err)
{
throw "Failed: " + err;
}
$$
;
Run it:
CALL SP_TESTING();
Shows NULL as result (expected since it is not returning anything).
But then when I check the table again:
select count(*) from citibike_trips where end_station_id=6215;
returns: 0
I'm working through a stored procedure and wondering if there's a way to retrieve the anticipated result column list from a sql statement before fully executing.
Scenarios:
dynamic SQL
a UDF that might vary the columns outside of our control
EX:
//inbound parameter
SET QUERY_DEFINITION_ID = 12345;
//Initial statement pulls query text from bank of queries
var sqlText = getQueryFromQueryBank(QUERY_DEFINITION_ID);
//now we run our query
var cmd = {sqlText: sqlText };
stmt = snowflake.createStatement(cmd);
What I'd like to be able to do is say "right - before you run this, give me the anticipated column list" so I can compare it to what's expected.
EX:
Expected: [col1, col2, col3, col4]
Got: [col1]
Result: Oops. Don't run.
Rationale here is that I want to short-circuit the execution if something is missing - before it potentially runs for a while. I can validate all of this after the fact, but it would be really helpful to stop early.
Any ideas very much appreciated!
This sample SP code shows how to get a list of columns that a query will project into the result before you run the query. It should only be used for large, long running queries because it will take a few seconds to get the column list.
There are a couple of caveats. 1) It will only return the names of the columns. It won't tell you how they were built, that is, whether they're aliased, direct from a table, calculated, etc. 2) The example query I used is straight from the Snowflake documentation here https://docs.snowflake.com/en/user-guide/sample-data-tpcds.html#functional-query-definition. For convenience, I minimized the query to a single line. The output of the columns includes object qualifiers in addition to the column names, so V1.I_CATEGORY, V1.D_YEAR, V1.D_MOY, etc. If you don't want them to make it easier to compare names, you can strip off the qualifiers using the JavaScript split function on the dot and take index 1 of the resulting array.
create or replace procedure EXPLAIN_BEFORE_RUNNING()
returns string
language javascript
execute as caller
as
$$
// Set the context for the session to the TPC-H sample data:
executeNonQuery("use schema snowflake_sample_data.tpcds_sf10tcl;");
// Here's a complex query from the Snowflake docs (minimized to one line for convienience):
var sql = `with v1 as( select i_category, i_brand, cc_name, d_year, d_moy, sum(cs_sales_price) sum_sales, avg(sum(cs_sales_price)) over(partition by i_category, i_brand, cc_name, d_year) avg_monthly_sales, rank() over (partition by i_category, i_brand, cc_name order by d_year, d_moy) rn from item, catalog_sales, date_dim, call_center where cs_item_sk = i_item_sk and cs_sold_date_sk = d_date_sk and cc_call_center_sk= cs_call_center_sk and ( d_year = 1999 or ( d_year = 1999-1 and d_moy =12) or ( d_year = 1999+1 and d_moy =1)) group by i_category, i_brand, cc_name , d_year, d_moy), v2 as( select v1.i_category ,v1.d_year, v1.d_moy ,v1.avg_monthly_sales ,v1.sum_sales, v1_lag.sum_sales psum, v1_lead.sum_sales nsum from v1, v1 v1_lag, v1 v1_lead where v1.i_category = v1_lag.i_category and v1.i_category = v1_lead.i_category and v1.i_brand = v1_lag.i_brand and v1.i_brand = v1_lead.i_brand and v1.cc_name = v1_lag.cc_name and v1.cc_name = v1_lead.cc_name and v1.rn = v1_lag.rn + 1 and v1.rn = v1_lead.rn - 1) select * from v2 where d_year = 1999 and avg_monthly_sales > 0 and case when avg_monthly_sales > 0 then abs(sum_sales - avg_monthly_sales) / avg_monthly_sales else null end > 0.1 order by sum_sales - avg_monthly_sales, 3 limit 100;`;
// Before actually running the query, generate an explain plan.
executeNonQuery("explain " + sql);
// Now read the column list from the explain plan from the result set.
var columnList = executeSingleValueQuery("COLUMN_LIST", `select "expressions" as COLUMN_LIST from table(result_scan(last_query_id())) where "operation" = 'Result';`);
// For now, just exit with the column list as the output...
return columnList;
// Your code here...
// Helper functions:
function executeNonQuery(queryString) {
var out = '';
cmd = {sqlText: queryString};
stmt = snowflake.createStatement(cmd);
var rs;
rs = stmt.execute();
}
function executeSingleValueQuery(columnName, queryString) {
var out;
cmd1 = {sqlText: queryString};
stmt = snowflake.createStatement(cmd1);
var rs;
try{
rs = stmt.execute();
rs.next();
return rs.getColumnValue(columnName);
}
catch(err) {
if (err.message.substring(0, 18) == "ResultSet is empty"){
throw "ERROR: No rows returned in query.";
} else {
throw "ERROR: " + err.message.replace(/\n/g, " ");
}
}
return out;
}
$$;
call Explain_Before_Running();
I have the following string:
'AAA|BBB||CCC|1.23'
I would like to return: 'CCC|1.23'
When using the regexp: \w+\|\d(.\d+|$) I am able to get the desired results.
When in Snowflake running the following query, returns the correct results:
SELECT REGEXP_SUBSTR('AAA|BBB||CCC|1.23', '\\w+\\|\\d(.\\d+|$)') AS regexp_return;
However when used in a stored procedure as follows:
CREATE OR REPLACE PROCEDURE dnr.regexp_issue ()
returns string
language javascript
execute as owner
AS
$$
var sql_statement = `SELECT REGEXP_SUBSTR('AAA|BBB||CCC|1.23', '\\w+\\|\\d(.\\d+|$)') AS regexp_return;`
var query = snowflake.createStatement({sqlText: sql_statement});
var query_res = query.execute();
query_res.next();
result = query_res.getColumnValue(1);
return result;
$$;
The resulting CALL dnr.regexp_issue(); returns a NULL as if no matching pattern was found.
Any ideas?
the slashed need to be double double quoted as they are going through two string parsers.
CREATE OR REPLACE PROCEDURE regexp_issue ()
returns string
language javascript
execute as owner
AS
$$
var sql_statement = `SELECT REGEXP_SUBSTR('AAA|BBB||CCC|1.23', '\\\\w+\\\\|\\\\d(.\\\\d+|$)') AS regexp_return;`
var query = snowflake.createStatement({sqlText: sql_statement});
var query_res = query.execute();
query_res.next();
result = query_res.getColumnValue(1);
return result;
$$;
call regexp_issue();
gives:
REGEXP_ISSUE
CCC|1.23
To add to Simeon's answer, you can also use .replace(/\\/g, "\\\\") at the end of a string that with double backslashes for Snowflake. That avoids using quadruple backslashes JavaScript + Snowflake SQL escape characters. It can make for more legible strings. It would look like this:
var sql_statement = `SELECT REGEXP_SUBSTR('AAA|BBB||CCC|1.23', '\\w+\\|\\d(.\\d+|$)') AS regexp_return;`.replace(/\\/g, "\\\\");
You can also put it in two separate lines for even more clarity and a few microseconds more processing time.
var sql_statement = `SELECT REGEXP_SUBSTR('AAA|BBB||CCC|1.23', '\\w+\\|\\d(.\\d+|$)') AS regexp_return;`
sql_statement = sql_statement.replace(/\\/g, "\\\\");
I am trying to assign a simple sql query result in stored procedure to a variable which I will use it later in another sql statement. If I execute below statement with out putting in procedure it works but not with stored procedure, I get an error while calling sp , Can someone please help me here ?
Procedure code:
$$
VAR NAME = 'ABC'
SET (COUNT_VALUE) = (SELECT COUNT(*) FROM COUNT_TABLE)
With out Procedure below code works
SET (COUNT_VALUE) = (SELECT COUNT(*) FROM COUNT_TABLE)
select $COUNT_VALUE
Thanks
Here's an example that uses a simple helper function to return a result set from a query. You can read the Snowflake docs to see what the result set API has in it. The getResultSet function returns a variable that has the results of the query. Since the SQL is a count, you need to use rs.next() once to get to the first row and then read the value in the aliased count(*). You could also use rs.getColumnValue(1) to get a column by ordinal position, but I recommend using column names with SQL aliases is necessary.
create or replace procedure COUNT_EXAMPLE()
returns string
language javascript
as
$$
var rowCount = 0;
var sql = "select count(*) as ROW_COUNT from SNOWFLAKE_SAMPLE_DATA.TPCH_SF10000.ORDERS;";
try {
var rs = getResultSet(sql);
if (rs.next()) {
var rowCount = rs.getColumnValue("ROW_COUNT");
} else {
return "Error: Count query failed.";
}
}
catch(err) {
return "Error: " + err.message;
}
return "The table has " + rowCount + " rows.";
//--------------------------- End of main function ---------------------------
function getResultSet(sql){
cmd1 = {sqlText: sql};
stmt = snowflake.createStatement(cmd1);
var rs;
rs = stmt.execute();
return rs;
}
$$;
call COUNT_EXAMPLE();
In a snowflake stored procedure I am executing CTAS statements and want to retrieve the number of rows in the resultant object. We don't have access to QUERY_HISTORY (we get an error), and RESULT_SCAN(LAST_QUERY_ID()) doesn't help either (it gives us back the Table xyz Created result, but does not have meta-data i.e. number of rows created).
I can do it with a Select Count(*) in a separate query, but that seems to be a hack since the Row Count is right there in the History.
CREATE OR REPLACE PROCEDURE EDW_ADMIN.DAG_TEST()
RETURNS VARCHAR(512)
LANGUAGE JAVASCRIPT
AS
$$
{
let strCTAS = "";
let rsCTAS;
let rsRowsAffected;
let rowsAffected = 0;
strCTAS = "CREATE OR REPLACE TABLE EDW_ADMIN.DEMO_PROC_TEMP AS SELECT * FROM RAW_BIR.H_RPTUNIT;";
rsCTAS = snowflake.execute( {sqlText: strCTAS} );
// This works in a Query Worksheet in the browser, but gives me the following error when called from a procedure
// "[Stored procedure execution error: Requested information on the current user is not accessible in stored procedure.]"
rsRowsAffected = snowflake.execute( {sqlText: "SELECT ROWS_PRODUCED FROM TABLE(INFORMATION_SCHEMA.QUERY_HISTORY(RESULT_LIMIT=>100)) WHERE QUERY_ID = LAST_QUERY_ID();"} );
rsRowsAffected.next();
rowsAffected = rsRowsAffected.getColumnValue(1);
// This works, but you are doing execute i/o which is really un-necessary
// rsRowsAffected = snowflake.execute( {sqlText: "SELECT COUNT(*) FROM EDW_ADMIN.DEMO_PROC_TEMP;"} );
// rsRowsAffected.next();
// rowsAffected = rsRowsAffected.getColumnValue(1);
// This does NOT work, RESULT_SCAN has no metadata associated with it, this returns "Table DEMO_PROC_TEMP successfully created."
// rsRowsAffected = snowflake.execute ( {sqlText: "SELECT * FROM TABLE(RESULT_SCAN(LAST_QUERY_ID()));" } );
// rsRowsAffected.next();
// rowsAffected = rsRowsAffected.getColumnValue(1);
return rowsAffected;
}
$$
;
CALL EDW_ADMIN.DAG_TEST();
DROP EDW_ADMIN.DEMO_PROC_TEMP;
DROP PROCEDURE EDW_ADMIN.DAG_TEST();
Try adding execute as caller to the stored procedure declaration. For example:
create or replace procedure p()
returns text
language javascript
execute as caller
as
$$
const stmt1 = snowflake.createStatement( { sqlText: "create or replace table t as select $1 x from values (1),(2),(3)" } )
const rs1 = stmt1.execute()
const stmt2 = snowflake.createStatement( { sqlText: "SELECT ROWS_PRODUCED FROM TABLE(INFORMATION_SCHEMA.QUERY_HISTORY(RESULT_LIMIT=>100)) WHERE QUERY_ID = LAST_QUERY_ID()" } )
const rs2 = stmt2.execute()
rs2.next()
const rowsAffected = rs2.getColumnValue(1)
return rowsAffected
$$
;
call p();
returns 3