How do you pass variables into Mirth Database Reader Channels for SQL expressions? - mirth

Question

I can't find any documentation on how to manager parameters into Database Reader SQL statements?
-> this is a simplified example: I am not looking for scripting a variable to "yesterday" which is easy to express in SQL. That's not the point. I have have more complex variables in the actual SQL statement I'm trying to martial in. I just want to know how to get variables into the SQL form if possible.
-> "you can just do that in JavaScript": the actual queries I need to run are about a hundred lines long, I don't want to maintain and debug a query build by concatenating strings and then deal with escaping 'quoted' things everywhere in the SQL. I really prefer to maintain an actual SQL statement that copy/paste works in a SQL IDE.
How do we pass in parameters into the SQL block at the bottom of the Database Reader form?
SELECT patientsex, visitnumber, samplereceived_dt, sr_d, sr_t, orderpriority, orderrequestcode, orderrequestname
FROM mydata.somedata
WHERE sr_d = (${DateUtil.getCurrentDate('yyyyMMdd')})::integer;

Answer 1

JavaScript is the feasible way to achieve this, with SQL statements defined inside Mirth connect or have the SQL statements bundled in a stored procedure then use SQL server's Exec command within Mirth connect to call the stored procedure while passing the parameters (interestingly using JavaScript).

Answer 2

For example
var dbConn;
try {
dbConn = DatabaseConnectionFactory.createDatabaseConnection('','DB:Port\instance','user','pass');
var paramList = new java.util.ArrayList();
paramList.add($('patientId'));
paramList.add($('lastName'));
paramList.add($('firstName'));
var result = dbConn.executeCachedQuery("SELECT * FROM patients WHERE patientid = ? AND lastname = ? AND firstname = ?) ",paramList);
while (result.next()) {
//you can reference by column index like so...
//result.getString(1);
}
} finally {
if (dbConn) {
dbConn.close();
}
}
Should be noted that the parameters you add to the list MUST be in order.