如何在 SQLite3 查询中包含环境变量

Question

I'm working on writing a batch file to pull data from multiple SQLite3 databases. I need to set 2 System environment variables then use them two environment variables within my SELECT statement.As this will run against multiple databases that are the same schema, but for different site locations. Currently 14 differen locations. What I have come up with so far is my main queryrun.bat file:

@echo off
setx /m DateStart '20200101'
setx /m DateEnd '20200103'
sqlite3 SiteID40.db < query40.dat
TIMEOUT /t 3
sqlite3 SiteID41.db < query41.dat

Then the query#.dat files look like this:

.mode list
.separator ,
.output results40.csv
SELECT * FROM FilesActive WHERE CompactDate >= %DateStart% and CompactDate <= %DateEnd%;
.quit

The %DateStart% and %DateEnd% is where I am wanting to insert the system variables of the same name. I have tried using $DateStart and %DateStart% both with no luck.

Any constructive help is appreciated. I must RE-ITERATE though that this is SQLite3 NOT MS SQL Server or mySQL.

Answer 1

Using the .param command in sqlite, something like this should work:

Change the .bat call from sqlite3 SiteID40.db < query40.dat to

sqlite3 SiteID40.db ".param set :DateStart %DateStart%" ".param set :DateEnd %DateEnd%" ".read query.dat"

Change the query#.dat file SELECTs to:

SELECT * FROM FilesActive WHERE CompactDate >= :DateStart and CompactDate <= :DateEnd;